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