[e599318] | 1 | #include <machine/rtems-bsd-config.h> |
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[0bde19e] | 2 | |
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| 3 | /*- |
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| 4 | * Copyright (c) 1982, 1986, 1989, 1993 |
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| 5 | * The Regents of the University of California. All rights reserved. |
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| 6 | * (c) UNIX System Laboratories, Inc. |
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| 7 | * All or some portions of this file are derived from material licensed |
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| 8 | * to the University of California by American Telephone and Telegraph |
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| 9 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
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| 10 | * the permission of UNIX System Laboratories, Inc. |
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| 11 | * |
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| 12 | * Redistribution and use in source and binary forms, with or without |
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| 13 | * modification, are permitted provided that the following conditions |
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| 14 | * are met: |
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| 15 | * 1. Redistributions of source code must retain the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer. |
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| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 18 | * notice, this list of conditions and the following disclaimer in the |
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| 19 | * documentation and/or other materials provided with the distribution. |
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| 20 | * 4. Neither the name of the University nor the names of its contributors |
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| 21 | * may be used to endorse or promote products derived from this software |
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| 22 | * without specific prior written permission. |
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| 23 | * |
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 34 | * SUCH DAMAGE. |
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| 35 | * |
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| 36 | * @(#)sys_generic.c 8.5 (Berkeley) 1/21/94 |
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| 37 | */ |
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| 38 | |
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[e599318] | 39 | #include <sys/cdefs.h> |
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[0bde19e] | 40 | __FBSDID("$FreeBSD$"); |
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| 41 | |
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| 42 | |
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[e599318] | 43 | #include <rtems/bsd/local/opt_compat.h> |
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| 44 | #include <rtems/bsd/local/opt_ktrace.h> |
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| 45 | |
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| 46 | #include <rtems/bsd/sys/param.h> |
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| 47 | #include <sys/systm.h> |
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| 48 | #include <sys/sysproto.h> |
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| 49 | #include <sys/filedesc.h> |
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| 50 | #include <sys/filio.h> |
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| 51 | #include <sys/fcntl.h> |
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| 52 | #include <sys/file.h> |
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| 53 | #include <sys/proc.h> |
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| 54 | #include <sys/signalvar.h> |
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| 55 | #include <sys/socketvar.h> |
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| 56 | #include <sys/uio.h> |
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| 57 | #include <sys/kernel.h> |
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| 58 | #include <sys/ktr.h> |
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| 59 | #include <sys/limits.h> |
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| 60 | #include <sys/malloc.h> |
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| 61 | #include <sys/poll.h> |
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| 62 | #include <sys/resourcevar.h> |
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| 63 | #include <sys/selinfo.h> |
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| 64 | #include <sys/sleepqueue.h> |
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| 65 | #include <sys/syscallsubr.h> |
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| 66 | #include <sys/sysctl.h> |
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| 67 | #include <sys/sysent.h> |
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| 68 | #include <sys/vnode.h> |
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| 69 | #include <sys/bio.h> |
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| 70 | #include <sys/buf.h> |
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| 71 | #include <sys/condvar.h> |
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[0bde19e] | 72 | #ifdef KTRACE |
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[e599318] | 73 | #include <sys/ktrace.h> |
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[0bde19e] | 74 | #endif |
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| 75 | |
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[e599318] | 76 | #include <security/audit/audit.h> |
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[0bde19e] | 77 | #ifdef __rtems__ |
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[8eb42e8] | 78 | #include <machine/rtems-bsd-syscall-api.h> |
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[0bde19e] | 79 | #endif /* __rtems__ */ |
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| 80 | |
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[8eb42e8] | 81 | #ifndef __rtems__ |
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[0bde19e] | 82 | static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer"); |
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[8eb42e8] | 83 | #endif /* __rtems__ */ |
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[0bde19e] | 84 | static MALLOC_DEFINE(M_SELECT, "select", "select() buffer"); |
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| 85 | #ifndef __rtems__ |
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| 86 | MALLOC_DEFINE(M_IOV, "iov", "large iov's"); |
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| 87 | #endif /* __rtems__ */ |
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| 88 | |
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[8eb42e8] | 89 | #ifndef __rtems__ |
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[0bde19e] | 90 | static int pollout(struct thread *, struct pollfd *, struct pollfd *, |
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| 91 | u_int); |
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| 92 | static int pollscan(struct thread *, struct pollfd *, u_int); |
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| 93 | static int pollrescan(struct thread *); |
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[8eb42e8] | 94 | #endif /* __rtems__ */ |
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[0bde19e] | 95 | static int selscan(struct thread *, fd_mask **, fd_mask **, int); |
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| 96 | static int selrescan(struct thread *, fd_mask **, fd_mask **); |
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[8eb42e8] | 97 | #ifndef __rtems__ |
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[0bde19e] | 98 | static void selfdalloc(struct thread *, void *); |
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[8eb42e8] | 99 | #endif /* __rtems__ */ |
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[0bde19e] | 100 | static void selfdfree(struct seltd *, struct selfd *); |
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[8eb42e8] | 101 | #ifndef __rtems__ |
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[0bde19e] | 102 | static int dofileread(struct thread *, int, struct file *, struct uio *, |
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| 103 | off_t, int); |
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| 104 | static int dofilewrite(struct thread *, int, struct file *, struct uio *, |
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| 105 | off_t, int); |
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[8eb42e8] | 106 | #endif /* __rtems__ */ |
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[0bde19e] | 107 | static void doselwakeup(struct selinfo *, int); |
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| 108 | static void seltdinit(struct thread *); |
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| 109 | static int seltdwait(struct thread *, int); |
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| 110 | static void seltdclear(struct thread *); |
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| 111 | |
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| 112 | /* |
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| 113 | * One seltd per-thread allocated on demand as needed. |
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| 114 | * |
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| 115 | * t - protected by st_mtx |
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| 116 | * k - Only accessed by curthread or read-only |
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| 117 | */ |
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| 118 | struct seltd { |
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| 119 | STAILQ_HEAD(, selfd) st_selq; /* (k) List of selfds. */ |
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| 120 | struct selfd *st_free1; /* (k) free fd for read set. */ |
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| 121 | struct selfd *st_free2; /* (k) free fd for write set. */ |
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| 122 | struct mtx st_mtx; /* Protects struct seltd */ |
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| 123 | struct cv st_wait; /* (t) Wait channel. */ |
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| 124 | int st_flags; /* (t) SELTD_ flags. */ |
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| 125 | }; |
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| 126 | |
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| 127 | #define SELTD_PENDING 0x0001 /* We have pending events. */ |
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| 128 | #define SELTD_RESCAN 0x0002 /* Doing a rescan. */ |
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| 129 | |
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| 130 | /* |
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| 131 | * One selfd allocated per-thread per-file-descriptor. |
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| 132 | * f - protected by sf_mtx |
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| 133 | */ |
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| 134 | struct selfd { |
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| 135 | STAILQ_ENTRY(selfd) sf_link; /* (k) fds owned by this td. */ |
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| 136 | TAILQ_ENTRY(selfd) sf_threads; /* (f) fds on this selinfo. */ |
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| 137 | struct selinfo *sf_si; /* (f) selinfo when linked. */ |
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| 138 | struct mtx *sf_mtx; /* Pointer to selinfo mtx. */ |
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| 139 | struct seltd *sf_td; /* (k) owning seltd. */ |
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| 140 | void *sf_cookie; /* (k) fd or pollfd. */ |
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| 141 | }; |
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| 142 | |
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| 143 | static uma_zone_t selfd_zone; |
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| 144 | static struct mtx_pool *mtxpool_select; |
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| 145 | |
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[8eb42e8] | 146 | #ifndef __rtems__ |
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[0bde19e] | 147 | #ifndef _SYS_SYSPROTO_H_ |
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| 148 | struct read_args { |
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| 149 | int fd; |
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| 150 | void *buf; |
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| 151 | size_t nbyte; |
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| 152 | }; |
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| 153 | #endif |
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| 154 | int |
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| 155 | read(td, uap) |
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| 156 | struct thread *td; |
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| 157 | struct read_args *uap; |
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| 158 | { |
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| 159 | struct uio auio; |
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| 160 | struct iovec aiov; |
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| 161 | int error; |
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| 162 | |
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| 163 | if (uap->nbyte > INT_MAX) |
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| 164 | return (EINVAL); |
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| 165 | aiov.iov_base = uap->buf; |
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| 166 | aiov.iov_len = uap->nbyte; |
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| 167 | auio.uio_iov = &aiov; |
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| 168 | auio.uio_iovcnt = 1; |
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| 169 | auio.uio_resid = uap->nbyte; |
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| 170 | auio.uio_segflg = UIO_USERSPACE; |
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| 171 | error = kern_readv(td, uap->fd, &auio); |
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| 172 | return(error); |
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| 173 | } |
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| 174 | |
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| 175 | /* |
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| 176 | * Positioned read system call |
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| 177 | */ |
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| 178 | #ifndef _SYS_SYSPROTO_H_ |
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| 179 | struct pread_args { |
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| 180 | int fd; |
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| 181 | void *buf; |
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| 182 | size_t nbyte; |
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| 183 | int pad; |
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| 184 | off_t offset; |
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| 185 | }; |
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| 186 | #endif |
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| 187 | int |
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| 188 | pread(td, uap) |
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| 189 | struct thread *td; |
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| 190 | struct pread_args *uap; |
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| 191 | { |
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| 192 | struct uio auio; |
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| 193 | struct iovec aiov; |
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| 194 | int error; |
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| 195 | |
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| 196 | if (uap->nbyte > INT_MAX) |
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| 197 | return (EINVAL); |
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| 198 | aiov.iov_base = uap->buf; |
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| 199 | aiov.iov_len = uap->nbyte; |
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| 200 | auio.uio_iov = &aiov; |
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| 201 | auio.uio_iovcnt = 1; |
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| 202 | auio.uio_resid = uap->nbyte; |
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| 203 | auio.uio_segflg = UIO_USERSPACE; |
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| 204 | error = kern_preadv(td, uap->fd, &auio, uap->offset); |
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| 205 | return(error); |
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| 206 | } |
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| 207 | |
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| 208 | int |
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| 209 | freebsd6_pread(td, uap) |
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| 210 | struct thread *td; |
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| 211 | struct freebsd6_pread_args *uap; |
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| 212 | { |
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| 213 | struct pread_args oargs; |
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| 214 | |
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| 215 | oargs.fd = uap->fd; |
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| 216 | oargs.buf = uap->buf; |
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| 217 | oargs.nbyte = uap->nbyte; |
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| 218 | oargs.offset = uap->offset; |
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| 219 | return (pread(td, &oargs)); |
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| 220 | } |
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| 221 | |
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| 222 | /* |
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| 223 | * Scatter read system call. |
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| 224 | */ |
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| 225 | #ifndef _SYS_SYSPROTO_H_ |
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| 226 | struct readv_args { |
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| 227 | int fd; |
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| 228 | struct iovec *iovp; |
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| 229 | u_int iovcnt; |
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| 230 | }; |
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| 231 | #endif |
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| 232 | int |
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| 233 | readv(struct thread *td, struct readv_args *uap) |
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| 234 | { |
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| 235 | struct uio *auio; |
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| 236 | int error; |
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| 237 | |
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| 238 | error = copyinuio(uap->iovp, uap->iovcnt, &auio); |
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| 239 | if (error) |
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| 240 | return (error); |
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| 241 | error = kern_readv(td, uap->fd, auio); |
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| 242 | free(auio, M_IOV); |
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| 243 | return (error); |
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| 244 | } |
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| 245 | |
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| 246 | int |
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| 247 | kern_readv(struct thread *td, int fd, struct uio *auio) |
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| 248 | { |
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| 249 | struct file *fp; |
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| 250 | int error; |
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| 251 | |
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| 252 | error = fget_read(td, fd, &fp); |
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| 253 | if (error) |
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| 254 | return (error); |
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| 255 | error = dofileread(td, fd, fp, auio, (off_t)-1, 0); |
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| 256 | fdrop(fp, td); |
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| 257 | return (error); |
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| 258 | } |
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| 259 | |
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| 260 | /* |
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| 261 | * Scatter positioned read system call. |
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| 262 | */ |
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| 263 | #ifndef _SYS_SYSPROTO_H_ |
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| 264 | struct preadv_args { |
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| 265 | int fd; |
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| 266 | struct iovec *iovp; |
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| 267 | u_int iovcnt; |
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| 268 | off_t offset; |
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| 269 | }; |
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| 270 | #endif |
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| 271 | int |
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| 272 | preadv(struct thread *td, struct preadv_args *uap) |
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| 273 | { |
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| 274 | struct uio *auio; |
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| 275 | int error; |
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| 276 | |
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| 277 | error = copyinuio(uap->iovp, uap->iovcnt, &auio); |
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| 278 | if (error) |
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| 279 | return (error); |
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| 280 | error = kern_preadv(td, uap->fd, auio, uap->offset); |
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| 281 | free(auio, M_IOV); |
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| 282 | return (error); |
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| 283 | } |
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| 284 | |
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| 285 | int |
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| 286 | kern_preadv(td, fd, auio, offset) |
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| 287 | struct thread *td; |
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| 288 | int fd; |
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| 289 | struct uio *auio; |
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| 290 | off_t offset; |
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| 291 | { |
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| 292 | struct file *fp; |
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| 293 | int error; |
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| 294 | |
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| 295 | error = fget_read(td, fd, &fp); |
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| 296 | if (error) |
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| 297 | return (error); |
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| 298 | if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) |
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| 299 | error = ESPIPE; |
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| 300 | else if (offset < 0 && fp->f_vnode->v_type != VCHR) |
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| 301 | error = EINVAL; |
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| 302 | else |
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| 303 | error = dofileread(td, fd, fp, auio, offset, FOF_OFFSET); |
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| 304 | fdrop(fp, td); |
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| 305 | return (error); |
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| 306 | } |
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| 307 | |
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| 308 | /* |
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| 309 | * Common code for readv and preadv that reads data in |
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| 310 | * from a file using the passed in uio, offset, and flags. |
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| 311 | */ |
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| 312 | static int |
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| 313 | dofileread(td, fd, fp, auio, offset, flags) |
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| 314 | struct thread *td; |
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| 315 | int fd; |
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| 316 | struct file *fp; |
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| 317 | struct uio *auio; |
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| 318 | off_t offset; |
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| 319 | int flags; |
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| 320 | { |
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| 321 | ssize_t cnt; |
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| 322 | int error; |
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| 323 | #ifdef KTRACE |
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| 324 | struct uio *ktruio = NULL; |
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| 325 | #endif |
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| 326 | |
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| 327 | /* Finish zero length reads right here */ |
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| 328 | if (auio->uio_resid == 0) { |
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| 329 | td->td_retval[0] = 0; |
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| 330 | return(0); |
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| 331 | } |
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| 332 | auio->uio_rw = UIO_READ; |
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| 333 | auio->uio_offset = offset; |
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| 334 | auio->uio_td = td; |
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| 335 | #ifdef KTRACE |
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| 336 | if (KTRPOINT(td, KTR_GENIO)) |
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| 337 | ktruio = cloneuio(auio); |
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| 338 | #endif |
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| 339 | cnt = auio->uio_resid; |
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| 340 | if ((error = fo_read(fp, auio, td->td_ucred, flags, td))) { |
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| 341 | if (auio->uio_resid != cnt && (error == ERESTART || |
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| 342 | error == EINTR || error == EWOULDBLOCK)) |
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| 343 | error = 0; |
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| 344 | } |
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| 345 | cnt -= auio->uio_resid; |
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| 346 | #ifdef KTRACE |
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| 347 | if (ktruio != NULL) { |
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| 348 | ktruio->uio_resid = cnt; |
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| 349 | ktrgenio(fd, UIO_READ, ktruio, error); |
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| 350 | } |
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| 351 | #endif |
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| 352 | td->td_retval[0] = cnt; |
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| 353 | return (error); |
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| 354 | } |
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| 355 | |
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| 356 | #ifndef _SYS_SYSPROTO_H_ |
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| 357 | struct write_args { |
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| 358 | int fd; |
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| 359 | const void *buf; |
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| 360 | size_t nbyte; |
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| 361 | }; |
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| 362 | #endif |
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| 363 | int |
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| 364 | write(td, uap) |
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| 365 | struct thread *td; |
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| 366 | struct write_args *uap; |
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| 367 | { |
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| 368 | struct uio auio; |
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| 369 | struct iovec aiov; |
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| 370 | int error; |
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| 371 | |
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| 372 | if (uap->nbyte > INT_MAX) |
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| 373 | return (EINVAL); |
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| 374 | aiov.iov_base = (void *)(uintptr_t)uap->buf; |
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| 375 | aiov.iov_len = uap->nbyte; |
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| 376 | auio.uio_iov = &aiov; |
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| 377 | auio.uio_iovcnt = 1; |
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| 378 | auio.uio_resid = uap->nbyte; |
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| 379 | auio.uio_segflg = UIO_USERSPACE; |
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| 380 | error = kern_writev(td, uap->fd, &auio); |
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| 381 | return(error); |
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| 382 | } |
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| 383 | |
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| 384 | /* |
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| 385 | * Positioned write system call. |
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| 386 | */ |
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| 387 | #ifndef _SYS_SYSPROTO_H_ |
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| 388 | struct pwrite_args { |
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| 389 | int fd; |
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| 390 | const void *buf; |
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| 391 | size_t nbyte; |
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| 392 | int pad; |
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| 393 | off_t offset; |
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| 394 | }; |
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| 395 | #endif |
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| 396 | int |
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| 397 | pwrite(td, uap) |
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| 398 | struct thread *td; |
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| 399 | struct pwrite_args *uap; |
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| 400 | { |
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| 401 | struct uio auio; |
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| 402 | struct iovec aiov; |
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| 403 | int error; |
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| 404 | |
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| 405 | if (uap->nbyte > INT_MAX) |
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| 406 | return (EINVAL); |
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| 407 | aiov.iov_base = (void *)(uintptr_t)uap->buf; |
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| 408 | aiov.iov_len = uap->nbyte; |
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| 409 | auio.uio_iov = &aiov; |
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| 410 | auio.uio_iovcnt = 1; |
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| 411 | auio.uio_resid = uap->nbyte; |
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| 412 | auio.uio_segflg = UIO_USERSPACE; |
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| 413 | error = kern_pwritev(td, uap->fd, &auio, uap->offset); |
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| 414 | return(error); |
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| 415 | } |
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| 416 | |
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| 417 | int |
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| 418 | freebsd6_pwrite(td, uap) |
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| 419 | struct thread *td; |
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| 420 | struct freebsd6_pwrite_args *uap; |
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| 421 | { |
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| 422 | struct pwrite_args oargs; |
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| 423 | |
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| 424 | oargs.fd = uap->fd; |
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| 425 | oargs.buf = uap->buf; |
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| 426 | oargs.nbyte = uap->nbyte; |
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| 427 | oargs.offset = uap->offset; |
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| 428 | return (pwrite(td, &oargs)); |
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| 429 | } |
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| 430 | |
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| 431 | /* |
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| 432 | * Gather write system call. |
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| 433 | */ |
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| 434 | #ifndef _SYS_SYSPROTO_H_ |
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| 435 | struct writev_args { |
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| 436 | int fd; |
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| 437 | struct iovec *iovp; |
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| 438 | u_int iovcnt; |
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| 439 | }; |
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| 440 | #endif |
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| 441 | int |
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| 442 | writev(struct thread *td, struct writev_args *uap) |
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| 443 | { |
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| 444 | struct uio *auio; |
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| 445 | int error; |
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| 446 | |
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| 447 | error = copyinuio(uap->iovp, uap->iovcnt, &auio); |
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| 448 | if (error) |
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| 449 | return (error); |
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| 450 | error = kern_writev(td, uap->fd, auio); |
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| 451 | free(auio, M_IOV); |
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| 452 | return (error); |
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| 453 | } |
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| 454 | |
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| 455 | int |
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| 456 | kern_writev(struct thread *td, int fd, struct uio *auio) |
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| 457 | { |
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| 458 | struct file *fp; |
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| 459 | int error; |
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| 460 | |
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| 461 | error = fget_write(td, fd, &fp); |
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| 462 | if (error) |
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| 463 | return (error); |
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| 464 | error = dofilewrite(td, fd, fp, auio, (off_t)-1, 0); |
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| 465 | fdrop(fp, td); |
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| 466 | return (error); |
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| 467 | } |
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| 468 | |
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| 469 | /* |
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| 470 | * Gather positioned write system call. |
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| 471 | */ |
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| 472 | #ifndef _SYS_SYSPROTO_H_ |
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| 473 | struct pwritev_args { |
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| 474 | int fd; |
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| 475 | struct iovec *iovp; |
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| 476 | u_int iovcnt; |
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| 477 | off_t offset; |
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| 478 | }; |
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| 479 | #endif |
---|
| 480 | int |
---|
| 481 | pwritev(struct thread *td, struct pwritev_args *uap) |
---|
| 482 | { |
---|
| 483 | struct uio *auio; |
---|
| 484 | int error; |
---|
| 485 | |
---|
| 486 | error = copyinuio(uap->iovp, uap->iovcnt, &auio); |
---|
| 487 | if (error) |
---|
| 488 | return (error); |
---|
| 489 | error = kern_pwritev(td, uap->fd, auio, uap->offset); |
---|
| 490 | free(auio, M_IOV); |
---|
| 491 | return (error); |
---|
| 492 | } |
---|
| 493 | |
---|
| 494 | int |
---|
| 495 | kern_pwritev(td, fd, auio, offset) |
---|
| 496 | struct thread *td; |
---|
| 497 | struct uio *auio; |
---|
| 498 | int fd; |
---|
| 499 | off_t offset; |
---|
| 500 | { |
---|
| 501 | struct file *fp; |
---|
| 502 | int error; |
---|
| 503 | |
---|
| 504 | error = fget_write(td, fd, &fp); |
---|
| 505 | if (error) |
---|
| 506 | return (error); |
---|
| 507 | if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) |
---|
| 508 | error = ESPIPE; |
---|
| 509 | else if (offset < 0 && fp->f_vnode->v_type != VCHR) |
---|
| 510 | error = EINVAL; |
---|
| 511 | else |
---|
| 512 | error = dofilewrite(td, fd, fp, auio, offset, FOF_OFFSET); |
---|
| 513 | fdrop(fp, td); |
---|
| 514 | return (error); |
---|
| 515 | } |
---|
| 516 | |
---|
| 517 | /* |
---|
| 518 | * Common code for writev and pwritev that writes data to |
---|
| 519 | * a file using the passed in uio, offset, and flags. |
---|
| 520 | */ |
---|
| 521 | static int |
---|
| 522 | dofilewrite(td, fd, fp, auio, offset, flags) |
---|
| 523 | struct thread *td; |
---|
| 524 | int fd; |
---|
| 525 | struct file *fp; |
---|
| 526 | struct uio *auio; |
---|
| 527 | off_t offset; |
---|
| 528 | int flags; |
---|
| 529 | { |
---|
| 530 | ssize_t cnt; |
---|
| 531 | int error; |
---|
| 532 | #ifdef KTRACE |
---|
| 533 | struct uio *ktruio = NULL; |
---|
| 534 | #endif |
---|
| 535 | |
---|
| 536 | auio->uio_rw = UIO_WRITE; |
---|
| 537 | auio->uio_td = td; |
---|
| 538 | auio->uio_offset = offset; |
---|
| 539 | #ifdef KTRACE |
---|
| 540 | if (KTRPOINT(td, KTR_GENIO)) |
---|
| 541 | ktruio = cloneuio(auio); |
---|
| 542 | #endif |
---|
| 543 | cnt = auio->uio_resid; |
---|
| 544 | if (fp->f_type == DTYPE_VNODE) |
---|
| 545 | bwillwrite(); |
---|
| 546 | if ((error = fo_write(fp, auio, td->td_ucred, flags, td))) { |
---|
| 547 | if (auio->uio_resid != cnt && (error == ERESTART || |
---|
| 548 | error == EINTR || error == EWOULDBLOCK)) |
---|
| 549 | error = 0; |
---|
| 550 | /* Socket layer is responsible for issuing SIGPIPE. */ |
---|
| 551 | if (fp->f_type != DTYPE_SOCKET && error == EPIPE) { |
---|
| 552 | PROC_LOCK(td->td_proc); |
---|
| 553 | tdksignal(td, SIGPIPE, NULL); |
---|
| 554 | PROC_UNLOCK(td->td_proc); |
---|
| 555 | } |
---|
| 556 | } |
---|
| 557 | cnt -= auio->uio_resid; |
---|
| 558 | #ifdef KTRACE |
---|
| 559 | if (ktruio != NULL) { |
---|
| 560 | ktruio->uio_resid = cnt; |
---|
| 561 | ktrgenio(fd, UIO_WRITE, ktruio, error); |
---|
| 562 | } |
---|
| 563 | #endif |
---|
| 564 | td->td_retval[0] = cnt; |
---|
| 565 | return (error); |
---|
| 566 | } |
---|
| 567 | |
---|
| 568 | /* |
---|
| 569 | * Truncate a file given a file descriptor. |
---|
| 570 | * |
---|
| 571 | * Can't use fget_write() here, since must return EINVAL and not EBADF if the |
---|
| 572 | * descriptor isn't writable. |
---|
| 573 | */ |
---|
| 574 | int |
---|
| 575 | kern_ftruncate(td, fd, length) |
---|
| 576 | struct thread *td; |
---|
| 577 | int fd; |
---|
| 578 | off_t length; |
---|
| 579 | { |
---|
| 580 | struct file *fp; |
---|
| 581 | int error; |
---|
| 582 | |
---|
| 583 | AUDIT_ARG_FD(fd); |
---|
| 584 | if (length < 0) |
---|
| 585 | return (EINVAL); |
---|
| 586 | error = fget(td, fd, &fp); |
---|
| 587 | if (error) |
---|
| 588 | return (error); |
---|
| 589 | AUDIT_ARG_FILE(td->td_proc, fp); |
---|
| 590 | if (!(fp->f_flag & FWRITE)) { |
---|
| 591 | fdrop(fp, td); |
---|
| 592 | return (EINVAL); |
---|
| 593 | } |
---|
| 594 | error = fo_truncate(fp, length, td->td_ucred, td); |
---|
| 595 | fdrop(fp, td); |
---|
| 596 | return (error); |
---|
| 597 | } |
---|
| 598 | |
---|
| 599 | #ifndef _SYS_SYSPROTO_H_ |
---|
| 600 | struct ftruncate_args { |
---|
| 601 | int fd; |
---|
| 602 | int pad; |
---|
| 603 | off_t length; |
---|
| 604 | }; |
---|
| 605 | #endif |
---|
| 606 | int |
---|
| 607 | ftruncate(td, uap) |
---|
| 608 | struct thread *td; |
---|
| 609 | struct ftruncate_args *uap; |
---|
| 610 | { |
---|
| 611 | |
---|
| 612 | return (kern_ftruncate(td, uap->fd, uap->length)); |
---|
| 613 | } |
---|
| 614 | |
---|
| 615 | #if defined(COMPAT_43) |
---|
| 616 | #ifndef _SYS_SYSPROTO_H_ |
---|
| 617 | struct oftruncate_args { |
---|
| 618 | int fd; |
---|
| 619 | long length; |
---|
| 620 | }; |
---|
| 621 | #endif |
---|
| 622 | int |
---|
| 623 | oftruncate(td, uap) |
---|
| 624 | struct thread *td; |
---|
| 625 | struct oftruncate_args *uap; |
---|
| 626 | { |
---|
| 627 | |
---|
| 628 | return (kern_ftruncate(td, uap->fd, uap->length)); |
---|
| 629 | } |
---|
| 630 | #endif /* COMPAT_43 */ |
---|
| 631 | |
---|
| 632 | #ifndef _SYS_SYSPROTO_H_ |
---|
| 633 | struct ioctl_args { |
---|
| 634 | int fd; |
---|
| 635 | u_long com; |
---|
| 636 | caddr_t data; |
---|
| 637 | }; |
---|
| 638 | #endif |
---|
| 639 | /* ARGSUSED */ |
---|
| 640 | int |
---|
| 641 | ioctl(struct thread *td, struct ioctl_args *uap) |
---|
| 642 | { |
---|
| 643 | u_long com; |
---|
| 644 | int arg, error; |
---|
| 645 | u_int size; |
---|
| 646 | caddr_t data; |
---|
| 647 | |
---|
| 648 | if (uap->com > 0xffffffff) { |
---|
| 649 | printf( |
---|
| 650 | "WARNING pid %d (%s): ioctl sign-extension ioctl %lx\n", |
---|
| 651 | td->td_proc->p_pid, td->td_name, uap->com); |
---|
| 652 | uap->com &= 0xffffffff; |
---|
| 653 | } |
---|
| 654 | com = uap->com; |
---|
| 655 | |
---|
| 656 | /* |
---|
| 657 | * Interpret high order word to find amount of data to be |
---|
| 658 | * copied to/from the user's address space. |
---|
| 659 | */ |
---|
| 660 | size = IOCPARM_LEN(com); |
---|
| 661 | if ((size > IOCPARM_MAX) || |
---|
| 662 | ((com & (IOC_VOID | IOC_IN | IOC_OUT)) == 0) || |
---|
| 663 | #if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43) |
---|
| 664 | ((com & IOC_OUT) && size == 0) || |
---|
| 665 | #else |
---|
| 666 | ((com & (IOC_IN | IOC_OUT)) && size == 0) || |
---|
| 667 | #endif |
---|
| 668 | ((com & IOC_VOID) && size > 0 && size != sizeof(int))) |
---|
| 669 | return (ENOTTY); |
---|
| 670 | |
---|
| 671 | if (size > 0) { |
---|
| 672 | if (com & IOC_VOID) { |
---|
| 673 | /* Integer argument. */ |
---|
| 674 | arg = (intptr_t)uap->data; |
---|
| 675 | data = (void *)&arg; |
---|
| 676 | size = 0; |
---|
| 677 | } else |
---|
| 678 | data = malloc((u_long)size, M_IOCTLOPS, M_WAITOK); |
---|
| 679 | } else |
---|
| 680 | data = (void *)&uap->data; |
---|
| 681 | if (com & IOC_IN) { |
---|
| 682 | error = copyin(uap->data, data, (u_int)size); |
---|
| 683 | if (error) { |
---|
| 684 | if (size > 0) |
---|
| 685 | free(data, M_IOCTLOPS); |
---|
| 686 | return (error); |
---|
| 687 | } |
---|
| 688 | } else if (com & IOC_OUT) { |
---|
| 689 | /* |
---|
| 690 | * Zero the buffer so the user always |
---|
| 691 | * gets back something deterministic. |
---|
| 692 | */ |
---|
| 693 | bzero(data, size); |
---|
| 694 | } |
---|
| 695 | |
---|
| 696 | error = kern_ioctl(td, uap->fd, com, data); |
---|
| 697 | |
---|
| 698 | if (error == 0 && (com & IOC_OUT)) |
---|
| 699 | error = copyout(data, uap->data, (u_int)size); |
---|
| 700 | |
---|
| 701 | if (size > 0) |
---|
| 702 | free(data, M_IOCTLOPS); |
---|
| 703 | return (error); |
---|
| 704 | } |
---|
| 705 | |
---|
| 706 | int |
---|
| 707 | kern_ioctl(struct thread *td, int fd, u_long com, caddr_t data) |
---|
| 708 | { |
---|
| 709 | struct file *fp; |
---|
| 710 | struct filedesc *fdp; |
---|
| 711 | int error; |
---|
| 712 | int tmp; |
---|
| 713 | |
---|
| 714 | AUDIT_ARG_FD(fd); |
---|
| 715 | AUDIT_ARG_CMD(com); |
---|
| 716 | if ((error = fget(td, fd, &fp)) != 0) |
---|
| 717 | return (error); |
---|
| 718 | if ((fp->f_flag & (FREAD | FWRITE)) == 0) { |
---|
| 719 | fdrop(fp, td); |
---|
| 720 | return (EBADF); |
---|
| 721 | } |
---|
| 722 | fdp = td->td_proc->p_fd; |
---|
| 723 | switch (com) { |
---|
| 724 | case FIONCLEX: |
---|
| 725 | FILEDESC_XLOCK(fdp); |
---|
| 726 | fdp->fd_ofileflags[fd] &= ~UF_EXCLOSE; |
---|
| 727 | FILEDESC_XUNLOCK(fdp); |
---|
| 728 | goto out; |
---|
| 729 | case FIOCLEX: |
---|
| 730 | FILEDESC_XLOCK(fdp); |
---|
| 731 | fdp->fd_ofileflags[fd] |= UF_EXCLOSE; |
---|
| 732 | FILEDESC_XUNLOCK(fdp); |
---|
| 733 | goto out; |
---|
| 734 | case FIONBIO: |
---|
| 735 | if ((tmp = *(int *)data)) |
---|
| 736 | atomic_set_int(&fp->f_flag, FNONBLOCK); |
---|
| 737 | else |
---|
| 738 | atomic_clear_int(&fp->f_flag, FNONBLOCK); |
---|
| 739 | data = (void *)&tmp; |
---|
| 740 | break; |
---|
| 741 | case FIOASYNC: |
---|
| 742 | if ((tmp = *(int *)data)) |
---|
| 743 | atomic_set_int(&fp->f_flag, FASYNC); |
---|
| 744 | else |
---|
| 745 | atomic_clear_int(&fp->f_flag, FASYNC); |
---|
| 746 | data = (void *)&tmp; |
---|
| 747 | break; |
---|
| 748 | } |
---|
| 749 | |
---|
| 750 | error = fo_ioctl(fp, com, data, td->td_ucred, td); |
---|
| 751 | out: |
---|
| 752 | fdrop(fp, td); |
---|
| 753 | return (error); |
---|
| 754 | } |
---|
| 755 | |
---|
| 756 | int |
---|
| 757 | poll_no_poll(int events) |
---|
| 758 | { |
---|
| 759 | /* |
---|
| 760 | * Return true for read/write. If the user asked for something |
---|
| 761 | * special, return POLLNVAL, so that clients have a way of |
---|
| 762 | * determining reliably whether or not the extended |
---|
| 763 | * functionality is present without hard-coding knowledge |
---|
| 764 | * of specific filesystem implementations. |
---|
| 765 | */ |
---|
| 766 | if (events & ~POLLSTANDARD) |
---|
| 767 | return (POLLNVAL); |
---|
| 768 | |
---|
| 769 | return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); |
---|
| 770 | } |
---|
| 771 | |
---|
| 772 | int |
---|
| 773 | pselect(struct thread *td, struct pselect_args *uap) |
---|
| 774 | { |
---|
| 775 | struct timespec ts; |
---|
| 776 | struct timeval tv, *tvp; |
---|
| 777 | sigset_t set, *uset; |
---|
| 778 | int error; |
---|
| 779 | |
---|
| 780 | if (uap->ts != NULL) { |
---|
| 781 | error = copyin(uap->ts, &ts, sizeof(ts)); |
---|
| 782 | if (error != 0) |
---|
| 783 | return (error); |
---|
| 784 | TIMESPEC_TO_TIMEVAL(&tv, &ts); |
---|
| 785 | tvp = &tv; |
---|
| 786 | } else |
---|
| 787 | tvp = NULL; |
---|
| 788 | if (uap->sm != NULL) { |
---|
| 789 | error = copyin(uap->sm, &set, sizeof(set)); |
---|
| 790 | if (error != 0) |
---|
| 791 | return (error); |
---|
| 792 | uset = &set; |
---|
| 793 | } else |
---|
| 794 | uset = NULL; |
---|
| 795 | return (kern_pselect(td, uap->nd, uap->in, uap->ou, uap->ex, tvp, |
---|
| 796 | uset, NFDBITS)); |
---|
| 797 | } |
---|
| 798 | |
---|
| 799 | int |
---|
| 800 | kern_pselect(struct thread *td, int nd, fd_set *in, fd_set *ou, fd_set *ex, |
---|
| 801 | struct timeval *tvp, sigset_t *uset, int abi_nfdbits) |
---|
| 802 | { |
---|
| 803 | int error; |
---|
| 804 | |
---|
| 805 | if (uset != NULL) { |
---|
| 806 | error = kern_sigprocmask(td, SIG_SETMASK, uset, |
---|
| 807 | &td->td_oldsigmask, 0); |
---|
| 808 | if (error != 0) |
---|
| 809 | return (error); |
---|
| 810 | td->td_pflags |= TDP_OLDMASK; |
---|
| 811 | /* |
---|
| 812 | * Make sure that ast() is called on return to |
---|
| 813 | * usermode and TDP_OLDMASK is cleared, restoring old |
---|
| 814 | * sigmask. |
---|
| 815 | */ |
---|
| 816 | thread_lock(td); |
---|
| 817 | td->td_flags |= TDF_ASTPENDING; |
---|
| 818 | thread_unlock(td); |
---|
| 819 | } |
---|
| 820 | error = kern_select(td, nd, in, ou, ex, tvp, abi_nfdbits); |
---|
| 821 | return (error); |
---|
| 822 | } |
---|
| 823 | |
---|
| 824 | #ifndef _SYS_SYSPROTO_H_ |
---|
| 825 | struct select_args { |
---|
| 826 | int nd; |
---|
| 827 | fd_set *in, *ou, *ex; |
---|
| 828 | struct timeval *tv; |
---|
| 829 | }; |
---|
| 830 | #endif |
---|
| 831 | int |
---|
| 832 | select(struct thread *td, struct select_args *uap) |
---|
| 833 | { |
---|
| 834 | struct timeval tv, *tvp; |
---|
| 835 | int error; |
---|
| 836 | |
---|
| 837 | if (uap->tv != NULL) { |
---|
| 838 | error = copyin(uap->tv, &tv, sizeof(tv)); |
---|
| 839 | if (error) |
---|
| 840 | return (error); |
---|
| 841 | tvp = &tv; |
---|
| 842 | } else |
---|
| 843 | tvp = NULL; |
---|
| 844 | |
---|
| 845 | return (kern_select(td, uap->nd, uap->in, uap->ou, uap->ex, tvp, |
---|
| 846 | NFDBITS)); |
---|
| 847 | } |
---|
[8eb42e8] | 848 | #endif /* __rtems__ */ |
---|
[0bde19e] | 849 | |
---|
| 850 | int |
---|
| 851 | kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou, |
---|
| 852 | fd_set *fd_ex, struct timeval *tvp, int abi_nfdbits) |
---|
| 853 | { |
---|
| 854 | struct filedesc *fdp; |
---|
| 855 | /* |
---|
| 856 | * The magic 2048 here is chosen to be just enough for FD_SETSIZE |
---|
| 857 | * infds with the new FD_SETSIZE of 1024, and more than enough for |
---|
| 858 | * FD_SETSIZE infds, outfds and exceptfds with the old FD_SETSIZE |
---|
| 859 | * of 256. |
---|
| 860 | */ |
---|
| 861 | fd_mask s_selbits[howmany(2048, NFDBITS)]; |
---|
| 862 | fd_mask *ibits[3], *obits[3], *selbits, *sbp; |
---|
| 863 | struct timeval atv, rtv, ttv; |
---|
| 864 | int error, timo; |
---|
| 865 | u_int nbufbytes, ncpbytes, ncpubytes, nfdbits; |
---|
| 866 | |
---|
[8eb42e8] | 867 | #ifdef __rtems__ |
---|
| 868 | if (td == NULL) |
---|
| 869 | return (ENOMEM); |
---|
| 870 | #endif /* __rtems__ */ |
---|
[0bde19e] | 871 | if (nd < 0) |
---|
| 872 | return (EINVAL); |
---|
| 873 | fdp = td->td_proc->p_fd; |
---|
| 874 | if (nd > fdp->fd_lastfile + 1) |
---|
| 875 | nd = fdp->fd_lastfile + 1; |
---|
| 876 | |
---|
| 877 | /* |
---|
| 878 | * Allocate just enough bits for the non-null fd_sets. Use the |
---|
| 879 | * preallocated auto buffer if possible. |
---|
| 880 | */ |
---|
| 881 | nfdbits = roundup(nd, NFDBITS); |
---|
| 882 | ncpbytes = nfdbits / NBBY; |
---|
| 883 | ncpubytes = roundup(nd, abi_nfdbits) / NBBY; |
---|
| 884 | nbufbytes = 0; |
---|
| 885 | if (fd_in != NULL) |
---|
| 886 | nbufbytes += 2 * ncpbytes; |
---|
| 887 | if (fd_ou != NULL) |
---|
| 888 | nbufbytes += 2 * ncpbytes; |
---|
| 889 | if (fd_ex != NULL) |
---|
| 890 | nbufbytes += 2 * ncpbytes; |
---|
| 891 | if (nbufbytes <= sizeof s_selbits) |
---|
| 892 | selbits = &s_selbits[0]; |
---|
| 893 | else |
---|
| 894 | selbits = malloc(nbufbytes, M_SELECT, M_WAITOK); |
---|
| 895 | |
---|
| 896 | /* |
---|
| 897 | * Assign pointers into the bit buffers and fetch the input bits. |
---|
| 898 | * Put the output buffers together so that they can be bzeroed |
---|
| 899 | * together. |
---|
| 900 | */ |
---|
| 901 | sbp = selbits; |
---|
| 902 | #define getbits(name, x) \ |
---|
| 903 | do { \ |
---|
| 904 | if (name == NULL) { \ |
---|
| 905 | ibits[x] = NULL; \ |
---|
| 906 | obits[x] = NULL; \ |
---|
| 907 | } else { \ |
---|
| 908 | ibits[x] = sbp + nbufbytes / 2 / sizeof *sbp; \ |
---|
| 909 | obits[x] = sbp; \ |
---|
| 910 | sbp += ncpbytes / sizeof *sbp; \ |
---|
| 911 | error = copyin(name, ibits[x], ncpubytes); \ |
---|
| 912 | if (error != 0) \ |
---|
| 913 | goto done; \ |
---|
| 914 | bzero((char *)ibits[x] + ncpubytes, \ |
---|
| 915 | ncpbytes - ncpubytes); \ |
---|
| 916 | } \ |
---|
| 917 | } while (0) |
---|
| 918 | getbits(fd_in, 0); |
---|
| 919 | getbits(fd_ou, 1); |
---|
| 920 | getbits(fd_ex, 2); |
---|
| 921 | #undef getbits |
---|
| 922 | |
---|
| 923 | #if BYTE_ORDER == BIG_ENDIAN && defined(__LP64__) |
---|
| 924 | /* |
---|
| 925 | * XXX: swizzle_fdset assumes that if abi_nfdbits != NFDBITS, |
---|
| 926 | * we are running under 32-bit emulation. This should be more |
---|
| 927 | * generic. |
---|
| 928 | */ |
---|
| 929 | #define swizzle_fdset(bits) \ |
---|
| 930 | if (abi_nfdbits != NFDBITS && bits != NULL) { \ |
---|
| 931 | int i; \ |
---|
| 932 | for (i = 0; i < ncpbytes / sizeof *sbp; i++) \ |
---|
| 933 | bits[i] = (bits[i] >> 32) | (bits[i] << 32); \ |
---|
| 934 | } |
---|
| 935 | #else |
---|
| 936 | #define swizzle_fdset(bits) |
---|
| 937 | #endif |
---|
| 938 | |
---|
| 939 | /* Make sure the bit order makes it through an ABI transition */ |
---|
| 940 | swizzle_fdset(ibits[0]); |
---|
| 941 | swizzle_fdset(ibits[1]); |
---|
| 942 | swizzle_fdset(ibits[2]); |
---|
| 943 | |
---|
| 944 | if (nbufbytes != 0) |
---|
| 945 | bzero(selbits, nbufbytes / 2); |
---|
| 946 | |
---|
| 947 | if (tvp != NULL) { |
---|
| 948 | atv = *tvp; |
---|
| 949 | if (itimerfix(&atv)) { |
---|
| 950 | error = EINVAL; |
---|
| 951 | goto done; |
---|
| 952 | } |
---|
| 953 | getmicrouptime(&rtv); |
---|
| 954 | timevaladd(&atv, &rtv); |
---|
| 955 | } else { |
---|
| 956 | atv.tv_sec = 0; |
---|
| 957 | atv.tv_usec = 0; |
---|
| 958 | } |
---|
| 959 | timo = 0; |
---|
| 960 | seltdinit(td); |
---|
| 961 | /* Iterate until the timeout expires or descriptors become ready. */ |
---|
| 962 | for (;;) { |
---|
| 963 | error = selscan(td, ibits, obits, nd); |
---|
| 964 | if (error || td->td_retval[0] != 0) |
---|
| 965 | break; |
---|
| 966 | if (atv.tv_sec || atv.tv_usec) { |
---|
| 967 | getmicrouptime(&rtv); |
---|
| 968 | if (timevalcmp(&rtv, &atv, >=)) |
---|
| 969 | break; |
---|
| 970 | ttv = atv; |
---|
| 971 | timevalsub(&ttv, &rtv); |
---|
| 972 | timo = ttv.tv_sec > 24 * 60 * 60 ? |
---|
| 973 | 24 * 60 * 60 * hz : tvtohz(&ttv); |
---|
| 974 | } |
---|
| 975 | error = seltdwait(td, timo); |
---|
| 976 | if (error) |
---|
| 977 | break; |
---|
| 978 | error = selrescan(td, ibits, obits); |
---|
| 979 | if (error || td->td_retval[0] != 0) |
---|
| 980 | break; |
---|
| 981 | } |
---|
| 982 | seltdclear(td); |
---|
| 983 | |
---|
| 984 | done: |
---|
| 985 | /* select is not restarted after signals... */ |
---|
| 986 | if (error == ERESTART) |
---|
| 987 | error = EINTR; |
---|
| 988 | if (error == EWOULDBLOCK) |
---|
| 989 | error = 0; |
---|
| 990 | |
---|
| 991 | /* swizzle bit order back, if necessary */ |
---|
| 992 | swizzle_fdset(obits[0]); |
---|
| 993 | swizzle_fdset(obits[1]); |
---|
| 994 | swizzle_fdset(obits[2]); |
---|
| 995 | #undef swizzle_fdset |
---|
| 996 | |
---|
| 997 | #define putbits(name, x) \ |
---|
| 998 | if (name && (error2 = copyout(obits[x], name, ncpubytes))) \ |
---|
| 999 | error = error2; |
---|
| 1000 | if (error == 0) { |
---|
| 1001 | int error2; |
---|
| 1002 | |
---|
| 1003 | putbits(fd_in, 0); |
---|
| 1004 | putbits(fd_ou, 1); |
---|
| 1005 | putbits(fd_ex, 2); |
---|
| 1006 | #undef putbits |
---|
| 1007 | } |
---|
| 1008 | if (selbits != &s_selbits[0]) |
---|
| 1009 | free(selbits, M_SELECT); |
---|
| 1010 | |
---|
| 1011 | return (error); |
---|
| 1012 | } |
---|
[8eb42e8] | 1013 | #ifdef __rtems__ |
---|
| 1014 | int |
---|
| 1015 | select(int nfds, fd_set *restrict readfds, fd_set *__restrict writefds, fd_set |
---|
| 1016 | *__restrict errorfds, struct timeval *__restrict timeout) |
---|
| 1017 | { |
---|
| 1018 | struct thread *td = rtems_bsd_get_curthread_or_null(); |
---|
| 1019 | int error = kern_select(td, nfds, readfds, writefds, errorfds, timeout, |
---|
| 1020 | NFDBITS); |
---|
| 1021 | |
---|
| 1022 | if (error == 0) { |
---|
| 1023 | return td->td_retval[0]; |
---|
| 1024 | } else { |
---|
| 1025 | rtems_set_errno_and_return_minus_one(error); |
---|
| 1026 | } |
---|
| 1027 | } |
---|
| 1028 | #endif /* __rtems__ */ |
---|
[e599318] | 1029 | #ifndef __rtems__ |
---|
[0bde19e] | 1030 | /* |
---|
| 1031 | * Convert a select bit set to poll flags. |
---|
| 1032 | * |
---|
| 1033 | * The backend always returns POLLHUP/POLLERR if appropriate and we |
---|
| 1034 | * return this as a set bit in any set. |
---|
| 1035 | */ |
---|
| 1036 | static int select_flags[3] = { |
---|
| 1037 | POLLRDNORM | POLLHUP | POLLERR, |
---|
| 1038 | POLLWRNORM | POLLHUP | POLLERR, |
---|
| 1039 | POLLRDBAND | POLLERR |
---|
| 1040 | }; |
---|
| 1041 | |
---|
| 1042 | /* |
---|
| 1043 | * Compute the fo_poll flags required for a fd given by the index and |
---|
| 1044 | * bit position in the fd_mask array. |
---|
| 1045 | */ |
---|
| 1046 | static __inline int |
---|
| 1047 | selflags(fd_mask **ibits, int idx, fd_mask bit) |
---|
| 1048 | { |
---|
| 1049 | int flags; |
---|
| 1050 | int msk; |
---|
| 1051 | |
---|
| 1052 | flags = 0; |
---|
| 1053 | for (msk = 0; msk < 3; msk++) { |
---|
| 1054 | if (ibits[msk] == NULL) |
---|
| 1055 | continue; |
---|
| 1056 | if ((ibits[msk][idx] & bit) == 0) |
---|
| 1057 | continue; |
---|
| 1058 | flags |= select_flags[msk]; |
---|
| 1059 | } |
---|
| 1060 | return (flags); |
---|
| 1061 | } |
---|
| 1062 | |
---|
| 1063 | /* |
---|
| 1064 | * Set the appropriate output bits given a mask of fired events and the |
---|
| 1065 | * input bits originally requested. |
---|
| 1066 | */ |
---|
| 1067 | static __inline int |
---|
| 1068 | selsetbits(fd_mask **ibits, fd_mask **obits, int idx, fd_mask bit, int events) |
---|
| 1069 | { |
---|
| 1070 | int msk; |
---|
| 1071 | int n; |
---|
| 1072 | |
---|
| 1073 | n = 0; |
---|
| 1074 | for (msk = 0; msk < 3; msk++) { |
---|
| 1075 | if ((events & select_flags[msk]) == 0) |
---|
| 1076 | continue; |
---|
| 1077 | if (ibits[msk] == NULL) |
---|
| 1078 | continue; |
---|
| 1079 | if ((ibits[msk][idx] & bit) == 0) |
---|
| 1080 | continue; |
---|
| 1081 | /* |
---|
| 1082 | * XXX Check for a duplicate set. This can occur because a |
---|
| 1083 | * socket calls selrecord() twice for each poll() call |
---|
| 1084 | * resulting in two selfds per real fd. selrescan() will |
---|
| 1085 | * call selsetbits twice as a result. |
---|
| 1086 | */ |
---|
| 1087 | if ((obits[msk][idx] & bit) != 0) |
---|
| 1088 | continue; |
---|
| 1089 | obits[msk][idx] |= bit; |
---|
| 1090 | n++; |
---|
| 1091 | } |
---|
| 1092 | |
---|
| 1093 | return (n); |
---|
| 1094 | } |
---|
[e599318] | 1095 | #endif /* __rtems__ */ |
---|
[0bde19e] | 1096 | |
---|
| 1097 | /* |
---|
| 1098 | * Traverse the list of fds attached to this thread's seltd and check for |
---|
| 1099 | * completion. |
---|
| 1100 | */ |
---|
| 1101 | static int |
---|
| 1102 | selrescan(struct thread *td, fd_mask **ibits, fd_mask **obits) |
---|
| 1103 | { |
---|
[e599318] | 1104 | #ifndef __rtems__ |
---|
[0bde19e] | 1105 | struct filedesc *fdp; |
---|
| 1106 | struct selinfo *si; |
---|
| 1107 | struct seltd *stp; |
---|
| 1108 | struct selfd *sfp; |
---|
| 1109 | struct selfd *sfn; |
---|
| 1110 | struct file *fp; |
---|
| 1111 | fd_mask bit; |
---|
| 1112 | int fd, ev, n, idx; |
---|
| 1113 | |
---|
| 1114 | fdp = td->td_proc->p_fd; |
---|
| 1115 | stp = td->td_sel; |
---|
| 1116 | n = 0; |
---|
| 1117 | STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn) { |
---|
| 1118 | fd = (int)(uintptr_t)sfp->sf_cookie; |
---|
| 1119 | si = sfp->sf_si; |
---|
| 1120 | selfdfree(stp, sfp); |
---|
| 1121 | /* If the selinfo wasn't cleared the event didn't fire. */ |
---|
| 1122 | if (si != NULL) |
---|
| 1123 | continue; |
---|
| 1124 | if ((fp = fget_unlocked(fdp, fd)) == NULL) |
---|
| 1125 | return (EBADF); |
---|
| 1126 | idx = fd / NFDBITS; |
---|
| 1127 | bit = (fd_mask)1 << (fd % NFDBITS); |
---|
| 1128 | ev = fo_poll(fp, selflags(ibits, idx, bit), td->td_ucred, td); |
---|
| 1129 | fdrop(fp, td); |
---|
| 1130 | if (ev != 0) |
---|
| 1131 | n += selsetbits(ibits, obits, idx, bit, ev); |
---|
| 1132 | } |
---|
| 1133 | stp->st_flags = 0; |
---|
| 1134 | td->td_retval[0] = n; |
---|
| 1135 | return (0); |
---|
[e599318] | 1136 | #else /* __rtems__ */ |
---|
| 1137 | return (ENOMEM); |
---|
| 1138 | #endif /* __rtems__ */ |
---|
[0bde19e] | 1139 | } |
---|
| 1140 | |
---|
| 1141 | /* |
---|
| 1142 | * Perform the initial filedescriptor scan and register ourselves with |
---|
| 1143 | * each selinfo. |
---|
| 1144 | */ |
---|
| 1145 | static int |
---|
| 1146 | selscan(td, ibits, obits, nfd) |
---|
| 1147 | struct thread *td; |
---|
| 1148 | fd_mask **ibits, **obits; |
---|
| 1149 | int nfd; |
---|
| 1150 | { |
---|
[e599318] | 1151 | #ifndef __rtems__ |
---|
[0bde19e] | 1152 | struct filedesc *fdp; |
---|
| 1153 | struct file *fp; |
---|
| 1154 | fd_mask bit; |
---|
| 1155 | int ev, flags, end, fd; |
---|
| 1156 | int n, idx; |
---|
| 1157 | |
---|
| 1158 | fdp = td->td_proc->p_fd; |
---|
| 1159 | n = 0; |
---|
| 1160 | for (idx = 0, fd = 0; fd < nfd; idx++) { |
---|
| 1161 | end = imin(fd + NFDBITS, nfd); |
---|
| 1162 | for (bit = 1; fd < end; bit <<= 1, fd++) { |
---|
| 1163 | /* Compute the list of events we're interested in. */ |
---|
| 1164 | flags = selflags(ibits, idx, bit); |
---|
| 1165 | if (flags == 0) |
---|
| 1166 | continue; |
---|
| 1167 | if ((fp = fget_unlocked(fdp, fd)) == NULL) |
---|
| 1168 | return (EBADF); |
---|
| 1169 | selfdalloc(td, (void *)(uintptr_t)fd); |
---|
| 1170 | ev = fo_poll(fp, flags, td->td_ucred, td); |
---|
| 1171 | fdrop(fp, td); |
---|
| 1172 | if (ev != 0) |
---|
| 1173 | n += selsetbits(ibits, obits, idx, bit, ev); |
---|
| 1174 | } |
---|
| 1175 | } |
---|
| 1176 | |
---|
| 1177 | td->td_retval[0] = n; |
---|
| 1178 | return (0); |
---|
[e599318] | 1179 | #else /* __rtems__ */ |
---|
| 1180 | return (ENOMEM); |
---|
[0bde19e] | 1181 | #endif /* __rtems__ */ |
---|
[e599318] | 1182 | } |
---|
[0bde19e] | 1183 | |
---|
[8eb42e8] | 1184 | #ifndef __rtems__ |
---|
[0bde19e] | 1185 | #ifndef _SYS_SYSPROTO_H_ |
---|
| 1186 | struct poll_args { |
---|
| 1187 | struct pollfd *fds; |
---|
| 1188 | u_int nfds; |
---|
| 1189 | int timeout; |
---|
| 1190 | }; |
---|
| 1191 | #endif |
---|
| 1192 | int |
---|
| 1193 | poll(td, uap) |
---|
| 1194 | struct thread *td; |
---|
| 1195 | struct poll_args *uap; |
---|
| 1196 | { |
---|
| 1197 | struct pollfd *bits; |
---|
| 1198 | struct pollfd smallbits[32]; |
---|
| 1199 | struct timeval atv, rtv, ttv; |
---|
| 1200 | int error = 0, timo; |
---|
| 1201 | u_int nfds; |
---|
| 1202 | size_t ni; |
---|
| 1203 | |
---|
| 1204 | nfds = uap->nfds; |
---|
| 1205 | if (nfds > maxfilesperproc && nfds > FD_SETSIZE) |
---|
| 1206 | return (EINVAL); |
---|
| 1207 | ni = nfds * sizeof(struct pollfd); |
---|
| 1208 | if (ni > sizeof(smallbits)) |
---|
| 1209 | bits = malloc(ni, M_TEMP, M_WAITOK); |
---|
| 1210 | else |
---|
| 1211 | bits = smallbits; |
---|
| 1212 | error = copyin(uap->fds, bits, ni); |
---|
| 1213 | if (error) |
---|
| 1214 | goto done; |
---|
| 1215 | if (uap->timeout != INFTIM) { |
---|
| 1216 | atv.tv_sec = uap->timeout / 1000; |
---|
| 1217 | atv.tv_usec = (uap->timeout % 1000) * 1000; |
---|
| 1218 | if (itimerfix(&atv)) { |
---|
| 1219 | error = EINVAL; |
---|
| 1220 | goto done; |
---|
| 1221 | } |
---|
| 1222 | getmicrouptime(&rtv); |
---|
| 1223 | timevaladd(&atv, &rtv); |
---|
| 1224 | } else { |
---|
| 1225 | atv.tv_sec = 0; |
---|
| 1226 | atv.tv_usec = 0; |
---|
| 1227 | } |
---|
| 1228 | timo = 0; |
---|
| 1229 | seltdinit(td); |
---|
| 1230 | /* Iterate until the timeout expires or descriptors become ready. */ |
---|
| 1231 | for (;;) { |
---|
| 1232 | error = pollscan(td, bits, nfds); |
---|
| 1233 | if (error || td->td_retval[0] != 0) |
---|
| 1234 | break; |
---|
| 1235 | if (atv.tv_sec || atv.tv_usec) { |
---|
| 1236 | getmicrouptime(&rtv); |
---|
| 1237 | if (timevalcmp(&rtv, &atv, >=)) |
---|
| 1238 | break; |
---|
| 1239 | ttv = atv; |
---|
| 1240 | timevalsub(&ttv, &rtv); |
---|
| 1241 | timo = ttv.tv_sec > 24 * 60 * 60 ? |
---|
| 1242 | 24 * 60 * 60 * hz : tvtohz(&ttv); |
---|
| 1243 | } |
---|
| 1244 | error = seltdwait(td, timo); |
---|
| 1245 | if (error) |
---|
| 1246 | break; |
---|
| 1247 | error = pollrescan(td); |
---|
| 1248 | if (error || td->td_retval[0] != 0) |
---|
| 1249 | break; |
---|
| 1250 | } |
---|
| 1251 | seltdclear(td); |
---|
| 1252 | |
---|
| 1253 | done: |
---|
| 1254 | /* poll is not restarted after signals... */ |
---|
| 1255 | if (error == ERESTART) |
---|
| 1256 | error = EINTR; |
---|
| 1257 | if (error == EWOULDBLOCK) |
---|
| 1258 | error = 0; |
---|
| 1259 | if (error == 0) { |
---|
| 1260 | error = pollout(td, bits, uap->fds, nfds); |
---|
| 1261 | if (error) |
---|
| 1262 | goto out; |
---|
| 1263 | } |
---|
| 1264 | out: |
---|
| 1265 | if (ni > sizeof(smallbits)) |
---|
| 1266 | free(bits, M_TEMP); |
---|
| 1267 | return (error); |
---|
| 1268 | } |
---|
| 1269 | |
---|
| 1270 | static int |
---|
| 1271 | pollrescan(struct thread *td) |
---|
| 1272 | { |
---|
| 1273 | struct seltd *stp; |
---|
| 1274 | struct selfd *sfp; |
---|
| 1275 | struct selfd *sfn; |
---|
| 1276 | struct selinfo *si; |
---|
| 1277 | struct filedesc *fdp; |
---|
| 1278 | struct file *fp; |
---|
| 1279 | struct pollfd *fd; |
---|
| 1280 | int n; |
---|
| 1281 | |
---|
| 1282 | n = 0; |
---|
| 1283 | fdp = td->td_proc->p_fd; |
---|
| 1284 | stp = td->td_sel; |
---|
| 1285 | FILEDESC_SLOCK(fdp); |
---|
| 1286 | STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn) { |
---|
| 1287 | fd = (struct pollfd *)sfp->sf_cookie; |
---|
| 1288 | si = sfp->sf_si; |
---|
| 1289 | selfdfree(stp, sfp); |
---|
| 1290 | /* If the selinfo wasn't cleared the event didn't fire. */ |
---|
| 1291 | if (si != NULL) |
---|
| 1292 | continue; |
---|
| 1293 | fp = fdp->fd_ofiles[fd->fd]; |
---|
| 1294 | if (fp == NULL) { |
---|
| 1295 | fd->revents = POLLNVAL; |
---|
| 1296 | n++; |
---|
| 1297 | continue; |
---|
| 1298 | } |
---|
| 1299 | /* |
---|
| 1300 | * Note: backend also returns POLLHUP and |
---|
| 1301 | * POLLERR if appropriate. |
---|
| 1302 | */ |
---|
| 1303 | fd->revents = fo_poll(fp, fd->events, td->td_ucred, td); |
---|
| 1304 | if (fd->revents != 0) |
---|
| 1305 | n++; |
---|
| 1306 | } |
---|
| 1307 | FILEDESC_SUNLOCK(fdp); |
---|
| 1308 | stp->st_flags = 0; |
---|
| 1309 | td->td_retval[0] = n; |
---|
| 1310 | return (0); |
---|
| 1311 | } |
---|
| 1312 | |
---|
| 1313 | |
---|
| 1314 | static int |
---|
| 1315 | pollout(td, fds, ufds, nfd) |
---|
| 1316 | struct thread *td; |
---|
| 1317 | struct pollfd *fds; |
---|
| 1318 | struct pollfd *ufds; |
---|
| 1319 | u_int nfd; |
---|
| 1320 | { |
---|
| 1321 | int error = 0; |
---|
| 1322 | u_int i = 0; |
---|
| 1323 | u_int n = 0; |
---|
| 1324 | |
---|
| 1325 | for (i = 0; i < nfd; i++) { |
---|
| 1326 | error = copyout(&fds->revents, &ufds->revents, |
---|
| 1327 | sizeof(ufds->revents)); |
---|
| 1328 | if (error) |
---|
| 1329 | return (error); |
---|
| 1330 | if (fds->revents != 0) |
---|
| 1331 | n++; |
---|
| 1332 | fds++; |
---|
| 1333 | ufds++; |
---|
| 1334 | } |
---|
| 1335 | td->td_retval[0] = n; |
---|
| 1336 | return (0); |
---|
| 1337 | } |
---|
| 1338 | |
---|
| 1339 | static int |
---|
| 1340 | pollscan(td, fds, nfd) |
---|
| 1341 | struct thread *td; |
---|
| 1342 | struct pollfd *fds; |
---|
| 1343 | u_int nfd; |
---|
| 1344 | { |
---|
| 1345 | struct filedesc *fdp = td->td_proc->p_fd; |
---|
| 1346 | int i; |
---|
| 1347 | struct file *fp; |
---|
| 1348 | int n = 0; |
---|
| 1349 | |
---|
| 1350 | FILEDESC_SLOCK(fdp); |
---|
| 1351 | for (i = 0; i < nfd; i++, fds++) { |
---|
| 1352 | if (fds->fd >= fdp->fd_nfiles) { |
---|
| 1353 | fds->revents = POLLNVAL; |
---|
| 1354 | n++; |
---|
| 1355 | } else if (fds->fd < 0) { |
---|
| 1356 | fds->revents = 0; |
---|
| 1357 | } else { |
---|
| 1358 | fp = fdp->fd_ofiles[fds->fd]; |
---|
| 1359 | if (fp == NULL) { |
---|
| 1360 | fds->revents = POLLNVAL; |
---|
| 1361 | n++; |
---|
| 1362 | } else { |
---|
| 1363 | /* |
---|
| 1364 | * Note: backend also returns POLLHUP and |
---|
| 1365 | * POLLERR if appropriate. |
---|
| 1366 | */ |
---|
| 1367 | selfdalloc(td, fds); |
---|
| 1368 | fds->revents = fo_poll(fp, fds->events, |
---|
| 1369 | td->td_ucred, td); |
---|
| 1370 | /* |
---|
| 1371 | * POSIX requires POLLOUT to be never |
---|
| 1372 | * set simultaneously with POLLHUP. |
---|
| 1373 | */ |
---|
| 1374 | if ((fds->revents & POLLHUP) != 0) |
---|
| 1375 | fds->revents &= ~POLLOUT; |
---|
| 1376 | |
---|
| 1377 | if (fds->revents != 0) |
---|
| 1378 | n++; |
---|
| 1379 | } |
---|
| 1380 | } |
---|
| 1381 | } |
---|
| 1382 | FILEDESC_SUNLOCK(fdp); |
---|
| 1383 | td->td_retval[0] = n; |
---|
| 1384 | return (0); |
---|
| 1385 | } |
---|
| 1386 | |
---|
| 1387 | /* |
---|
| 1388 | * OpenBSD poll system call. |
---|
| 1389 | * |
---|
| 1390 | * XXX this isn't quite a true representation.. OpenBSD uses select ops. |
---|
| 1391 | */ |
---|
| 1392 | #ifndef _SYS_SYSPROTO_H_ |
---|
| 1393 | struct openbsd_poll_args { |
---|
| 1394 | struct pollfd *fds; |
---|
| 1395 | u_int nfds; |
---|
| 1396 | int timeout; |
---|
| 1397 | }; |
---|
| 1398 | #endif |
---|
| 1399 | int |
---|
| 1400 | openbsd_poll(td, uap) |
---|
| 1401 | register struct thread *td; |
---|
| 1402 | register struct openbsd_poll_args *uap; |
---|
| 1403 | { |
---|
| 1404 | return (poll(td, (struct poll_args *)uap)); |
---|
| 1405 | } |
---|
| 1406 | |
---|
| 1407 | /* |
---|
| 1408 | * XXX This was created specifically to support netncp and netsmb. This |
---|
| 1409 | * allows the caller to specify a socket to wait for events on. It returns |
---|
| 1410 | * 0 if any events matched and an error otherwise. There is no way to |
---|
| 1411 | * determine which events fired. |
---|
| 1412 | */ |
---|
| 1413 | int |
---|
| 1414 | selsocket(struct socket *so, int events, struct timeval *tvp, struct thread *td) |
---|
| 1415 | { |
---|
| 1416 | struct timeval atv, rtv, ttv; |
---|
| 1417 | int error, timo; |
---|
| 1418 | |
---|
| 1419 | if (tvp != NULL) { |
---|
| 1420 | atv = *tvp; |
---|
| 1421 | if (itimerfix(&atv)) |
---|
| 1422 | return (EINVAL); |
---|
| 1423 | getmicrouptime(&rtv); |
---|
| 1424 | timevaladd(&atv, &rtv); |
---|
| 1425 | } else { |
---|
| 1426 | atv.tv_sec = 0; |
---|
| 1427 | atv.tv_usec = 0; |
---|
| 1428 | } |
---|
| 1429 | |
---|
| 1430 | timo = 0; |
---|
| 1431 | seltdinit(td); |
---|
| 1432 | /* |
---|
| 1433 | * Iterate until the timeout expires or the socket becomes ready. |
---|
| 1434 | */ |
---|
| 1435 | for (;;) { |
---|
| 1436 | selfdalloc(td, NULL); |
---|
| 1437 | error = sopoll(so, events, NULL, td); |
---|
| 1438 | /* error here is actually the ready events. */ |
---|
| 1439 | if (error) |
---|
| 1440 | return (0); |
---|
| 1441 | if (atv.tv_sec || atv.tv_usec) { |
---|
| 1442 | getmicrouptime(&rtv); |
---|
| 1443 | if (timevalcmp(&rtv, &atv, >=)) { |
---|
| 1444 | seltdclear(td); |
---|
| 1445 | return (EWOULDBLOCK); |
---|
| 1446 | } |
---|
| 1447 | ttv = atv; |
---|
| 1448 | timevalsub(&ttv, &rtv); |
---|
| 1449 | timo = ttv.tv_sec > 24 * 60 * 60 ? |
---|
| 1450 | 24 * 60 * 60 * hz : tvtohz(&ttv); |
---|
| 1451 | } |
---|
| 1452 | error = seltdwait(td, timo); |
---|
| 1453 | seltdclear(td); |
---|
| 1454 | if (error) |
---|
| 1455 | break; |
---|
| 1456 | } |
---|
| 1457 | /* XXX Duplicates ncp/smb behavior. */ |
---|
| 1458 | if (error == ERESTART) |
---|
| 1459 | error = 0; |
---|
| 1460 | return (error); |
---|
| 1461 | } |
---|
| 1462 | |
---|
| 1463 | /* |
---|
| 1464 | * Preallocate two selfds associated with 'cookie'. Some fo_poll routines |
---|
| 1465 | * have two select sets, one for read and another for write. |
---|
| 1466 | */ |
---|
| 1467 | static void |
---|
| 1468 | selfdalloc(struct thread *td, void *cookie) |
---|
| 1469 | { |
---|
| 1470 | struct seltd *stp; |
---|
| 1471 | |
---|
| 1472 | stp = td->td_sel; |
---|
| 1473 | if (stp->st_free1 == NULL) |
---|
| 1474 | stp->st_free1 = uma_zalloc(selfd_zone, M_WAITOK|M_ZERO); |
---|
| 1475 | stp->st_free1->sf_td = stp; |
---|
| 1476 | stp->st_free1->sf_cookie = cookie; |
---|
| 1477 | if (stp->st_free2 == NULL) |
---|
| 1478 | stp->st_free2 = uma_zalloc(selfd_zone, M_WAITOK|M_ZERO); |
---|
| 1479 | stp->st_free2->sf_td = stp; |
---|
| 1480 | stp->st_free2->sf_cookie = cookie; |
---|
| 1481 | } |
---|
[8eb42e8] | 1482 | #endif /* __rtems__ */ |
---|
[0bde19e] | 1483 | |
---|
| 1484 | static void |
---|
| 1485 | selfdfree(struct seltd *stp, struct selfd *sfp) |
---|
| 1486 | { |
---|
| 1487 | STAILQ_REMOVE(&stp->st_selq, sfp, selfd, sf_link); |
---|
| 1488 | mtx_lock(sfp->sf_mtx); |
---|
| 1489 | if (sfp->sf_si) |
---|
| 1490 | TAILQ_REMOVE(&sfp->sf_si->si_tdlist, sfp, sf_threads); |
---|
| 1491 | mtx_unlock(sfp->sf_mtx); |
---|
| 1492 | uma_zfree(selfd_zone, sfp); |
---|
| 1493 | } |
---|
| 1494 | |
---|
| 1495 | /* |
---|
| 1496 | * Record a select request. |
---|
| 1497 | */ |
---|
| 1498 | void |
---|
| 1499 | selrecord(selector, sip) |
---|
| 1500 | struct thread *selector; |
---|
| 1501 | struct selinfo *sip; |
---|
| 1502 | { |
---|
| 1503 | struct selfd *sfp; |
---|
| 1504 | struct seltd *stp; |
---|
| 1505 | struct mtx *mtxp; |
---|
| 1506 | |
---|
| 1507 | stp = selector->td_sel; |
---|
| 1508 | /* |
---|
| 1509 | * Don't record when doing a rescan. |
---|
| 1510 | */ |
---|
| 1511 | if (stp->st_flags & SELTD_RESCAN) |
---|
| 1512 | return; |
---|
| 1513 | /* |
---|
| 1514 | * Grab one of the preallocated descriptors. |
---|
| 1515 | */ |
---|
| 1516 | sfp = NULL; |
---|
| 1517 | if ((sfp = stp->st_free1) != NULL) |
---|
| 1518 | stp->st_free1 = NULL; |
---|
| 1519 | else if ((sfp = stp->st_free2) != NULL) |
---|
| 1520 | stp->st_free2 = NULL; |
---|
| 1521 | else |
---|
| 1522 | panic("selrecord: No free selfd on selq"); |
---|
| 1523 | mtxp = sip->si_mtx; |
---|
| 1524 | if (mtxp == NULL) |
---|
| 1525 | mtxp = mtx_pool_find(mtxpool_select, sip); |
---|
| 1526 | /* |
---|
| 1527 | * Initialize the sfp and queue it in the thread. |
---|
| 1528 | */ |
---|
| 1529 | sfp->sf_si = sip; |
---|
| 1530 | sfp->sf_mtx = mtxp; |
---|
| 1531 | STAILQ_INSERT_TAIL(&stp->st_selq, sfp, sf_link); |
---|
| 1532 | /* |
---|
| 1533 | * Now that we've locked the sip, check for initialization. |
---|
| 1534 | */ |
---|
| 1535 | mtx_lock(mtxp); |
---|
| 1536 | if (sip->si_mtx == NULL) { |
---|
| 1537 | sip->si_mtx = mtxp; |
---|
| 1538 | TAILQ_INIT(&sip->si_tdlist); |
---|
| 1539 | } |
---|
| 1540 | /* |
---|
| 1541 | * Add this thread to the list of selfds listening on this selinfo. |
---|
| 1542 | */ |
---|
| 1543 | TAILQ_INSERT_TAIL(&sip->si_tdlist, sfp, sf_threads); |
---|
| 1544 | mtx_unlock(sip->si_mtx); |
---|
| 1545 | } |
---|
| 1546 | |
---|
| 1547 | /* Wake up a selecting thread. */ |
---|
| 1548 | void |
---|
| 1549 | selwakeup(sip) |
---|
| 1550 | struct selinfo *sip; |
---|
| 1551 | { |
---|
| 1552 | doselwakeup(sip, -1); |
---|
| 1553 | } |
---|
| 1554 | |
---|
| 1555 | /* Wake up a selecting thread, and set its priority. */ |
---|
| 1556 | void |
---|
| 1557 | selwakeuppri(sip, pri) |
---|
| 1558 | struct selinfo *sip; |
---|
| 1559 | int pri; |
---|
| 1560 | { |
---|
| 1561 | doselwakeup(sip, pri); |
---|
| 1562 | } |
---|
| 1563 | |
---|
| 1564 | /* |
---|
| 1565 | * Do a wakeup when a selectable event occurs. |
---|
| 1566 | */ |
---|
| 1567 | static void |
---|
| 1568 | doselwakeup(sip, pri) |
---|
| 1569 | struct selinfo *sip; |
---|
| 1570 | int pri; |
---|
| 1571 | { |
---|
| 1572 | struct selfd *sfp; |
---|
| 1573 | struct selfd *sfn; |
---|
| 1574 | struct seltd *stp; |
---|
| 1575 | |
---|
| 1576 | /* If it's not initialized there can't be any waiters. */ |
---|
| 1577 | if (sip->si_mtx == NULL) |
---|
| 1578 | return; |
---|
| 1579 | /* |
---|
| 1580 | * Locking the selinfo locks all selfds associated with it. |
---|
| 1581 | */ |
---|
| 1582 | mtx_lock(sip->si_mtx); |
---|
| 1583 | TAILQ_FOREACH_SAFE(sfp, &sip->si_tdlist, sf_threads, sfn) { |
---|
| 1584 | /* |
---|
| 1585 | * Once we remove this sfp from the list and clear the |
---|
| 1586 | * sf_si seltdclear will know to ignore this si. |
---|
| 1587 | */ |
---|
| 1588 | TAILQ_REMOVE(&sip->si_tdlist, sfp, sf_threads); |
---|
| 1589 | sfp->sf_si = NULL; |
---|
| 1590 | stp = sfp->sf_td; |
---|
| 1591 | mtx_lock(&stp->st_mtx); |
---|
| 1592 | stp->st_flags |= SELTD_PENDING; |
---|
| 1593 | cv_broadcastpri(&stp->st_wait, pri); |
---|
| 1594 | mtx_unlock(&stp->st_mtx); |
---|
| 1595 | } |
---|
| 1596 | mtx_unlock(sip->si_mtx); |
---|
| 1597 | } |
---|
| 1598 | |
---|
| 1599 | static void |
---|
| 1600 | seltdinit(struct thread *td) |
---|
| 1601 | { |
---|
| 1602 | struct seltd *stp; |
---|
| 1603 | |
---|
| 1604 | if ((stp = td->td_sel) != NULL) |
---|
| 1605 | goto out; |
---|
| 1606 | td->td_sel = stp = malloc(sizeof(*stp), M_SELECT, M_WAITOK|M_ZERO); |
---|
| 1607 | mtx_init(&stp->st_mtx, "sellck", NULL, MTX_DEF); |
---|
| 1608 | cv_init(&stp->st_wait, "select"); |
---|
| 1609 | out: |
---|
| 1610 | stp->st_flags = 0; |
---|
| 1611 | STAILQ_INIT(&stp->st_selq); |
---|
| 1612 | } |
---|
| 1613 | |
---|
| 1614 | static int |
---|
| 1615 | seltdwait(struct thread *td, int timo) |
---|
| 1616 | { |
---|
| 1617 | struct seltd *stp; |
---|
| 1618 | int error; |
---|
| 1619 | |
---|
| 1620 | stp = td->td_sel; |
---|
| 1621 | /* |
---|
| 1622 | * An event of interest may occur while we do not hold the seltd |
---|
| 1623 | * locked so check the pending flag before we sleep. |
---|
| 1624 | */ |
---|
| 1625 | mtx_lock(&stp->st_mtx); |
---|
| 1626 | /* |
---|
| 1627 | * Any further calls to selrecord will be a rescan. |
---|
| 1628 | */ |
---|
| 1629 | stp->st_flags |= SELTD_RESCAN; |
---|
| 1630 | if (stp->st_flags & SELTD_PENDING) { |
---|
| 1631 | mtx_unlock(&stp->st_mtx); |
---|
| 1632 | return (0); |
---|
| 1633 | } |
---|
| 1634 | if (timo > 0) |
---|
| 1635 | error = cv_timedwait_sig(&stp->st_wait, &stp->st_mtx, timo); |
---|
| 1636 | else |
---|
| 1637 | error = cv_wait_sig(&stp->st_wait, &stp->st_mtx); |
---|
| 1638 | mtx_unlock(&stp->st_mtx); |
---|
| 1639 | |
---|
| 1640 | return (error); |
---|
| 1641 | } |
---|
| 1642 | |
---|
| 1643 | void |
---|
| 1644 | seltdfini(struct thread *td) |
---|
| 1645 | { |
---|
| 1646 | struct seltd *stp; |
---|
| 1647 | |
---|
| 1648 | stp = td->td_sel; |
---|
| 1649 | if (stp == NULL) |
---|
| 1650 | return; |
---|
| 1651 | if (stp->st_free1) |
---|
| 1652 | uma_zfree(selfd_zone, stp->st_free1); |
---|
| 1653 | if (stp->st_free2) |
---|
| 1654 | uma_zfree(selfd_zone, stp->st_free2); |
---|
| 1655 | td->td_sel = NULL; |
---|
| 1656 | free(stp, M_SELECT); |
---|
| 1657 | } |
---|
| 1658 | |
---|
| 1659 | /* |
---|
| 1660 | * Remove the references to the thread from all of the objects we were |
---|
| 1661 | * polling. |
---|
| 1662 | */ |
---|
| 1663 | static void |
---|
| 1664 | seltdclear(struct thread *td) |
---|
| 1665 | { |
---|
| 1666 | struct seltd *stp; |
---|
| 1667 | struct selfd *sfp; |
---|
| 1668 | struct selfd *sfn; |
---|
| 1669 | |
---|
| 1670 | stp = td->td_sel; |
---|
| 1671 | STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn) |
---|
| 1672 | selfdfree(stp, sfp); |
---|
| 1673 | stp->st_flags = 0; |
---|
| 1674 | } |
---|
| 1675 | |
---|
| 1676 | static void selectinit(void *); |
---|
| 1677 | SYSINIT(select, SI_SUB_SYSCALLS, SI_ORDER_ANY, selectinit, NULL); |
---|
| 1678 | static void |
---|
| 1679 | selectinit(void *dummy __unused) |
---|
| 1680 | { |
---|
| 1681 | |
---|
| 1682 | selfd_zone = uma_zcreate("selfd", sizeof(struct selfd), NULL, NULL, |
---|
| 1683 | NULL, NULL, UMA_ALIGN_PTR, 0); |
---|
| 1684 | mtxpool_select = mtx_pool_create("select mtxpool", 128, MTX_DEF); |
---|
| 1685 | } |
---|