[d48955b] | 1 | #include <machine/rtems-bsd-user-space.h> |
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| 2 | |
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[5d3848d] | 3 | /* |
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| 4 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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| 5 | * Copyright (c) 1996-1999 by Internet Software Consortium |
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| 6 | * |
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| 7 | * Permission to use, copy, modify, and distribute this software for any |
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| 8 | * purpose with or without fee is hereby granted, provided that the above |
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| 9 | * copyright notice and this permission notice appear in all copies. |
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| 10 | * |
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| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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| 12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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| 14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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| 17 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 18 | */ |
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| 19 | |
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| 20 | /* ev_streams.c - implement asynch stream file IO for the eventlib |
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| 21 | * vix 04mar96 [initial] |
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| 22 | */ |
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| 23 | |
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| 24 | #if !defined(LINT) && !defined(CODECENTER) |
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[165dd8e] | 25 | static const char rcsid[] = "$Id: ev_streams.c,v 1.5 2005/04/27 04:56:36 sra Exp $"; |
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[5d3848d] | 26 | #endif |
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| 27 | #include <sys/cdefs.h> |
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| 28 | __FBSDID("$FreeBSD$"); |
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| 29 | |
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| 30 | #include "port_before.h" |
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| 31 | #ifndef _LIBC |
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| 32 | #include "fd_setsize.h" |
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| 33 | #endif |
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| 34 | |
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[3d1e767] | 35 | #include <sys/types.h> |
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[5d3848d] | 36 | #include <sys/uio.h> |
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| 37 | |
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| 38 | #include <errno.h> |
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| 39 | |
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| 40 | #include <isc/eventlib.h> |
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| 41 | #ifndef _LIBC |
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| 42 | #include <isc/assertions.h> |
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| 43 | #endif |
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| 44 | #include "eventlib_p.h" |
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| 45 | |
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| 46 | #include "port_after.h" |
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| 47 | |
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| 48 | #ifndef _LIBC |
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| 49 | static int copyvec(evStream *str, const struct iovec *iov, int iocnt); |
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| 50 | static void consume(evStream *str, size_t bytes); |
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| 51 | static void done(evContext opaqueCtx, evStream *str); |
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| 52 | static void writable(evContext opaqueCtx, void *uap, int fd, int evmask); |
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| 53 | static void readable(evContext opaqueCtx, void *uap, int fd, int evmask); |
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| 54 | #endif |
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| 55 | |
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| 56 | struct iovec |
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| 57 | evConsIovec(void *buf, size_t cnt) { |
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| 58 | struct iovec ret; |
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| 59 | |
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| 60 | memset(&ret, 0xf5, sizeof ret); |
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| 61 | ret.iov_base = buf; |
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| 62 | ret.iov_len = cnt; |
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| 63 | return (ret); |
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| 64 | } |
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| 65 | |
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| 66 | #ifndef _LIBC |
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| 67 | int |
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| 68 | evWrite(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt, |
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| 69 | evStreamFunc func, void *uap, evStreamID *id) |
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| 70 | { |
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| 71 | evContext_p *ctx = opaqueCtx.opaque; |
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| 72 | evStream *new; |
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| 73 | int save; |
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| 74 | |
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| 75 | OKNEW(new); |
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| 76 | new->func = func; |
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| 77 | new->uap = uap; |
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| 78 | new->fd = fd; |
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| 79 | new->flags = 0; |
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| 80 | if (evSelectFD(opaqueCtx, fd, EV_WRITE, writable, new, &new->file) < 0) |
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| 81 | goto free; |
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| 82 | if (copyvec(new, iov, iocnt) < 0) |
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| 83 | goto free; |
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| 84 | new->prevDone = NULL; |
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| 85 | new->nextDone = NULL; |
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| 86 | if (ctx->streams != NULL) |
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| 87 | ctx->streams->prev = new; |
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| 88 | new->prev = NULL; |
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| 89 | new->next = ctx->streams; |
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| 90 | ctx->streams = new; |
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| 91 | if (id != NULL) |
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| 92 | id->opaque = new; |
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| 93 | return (0); |
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| 94 | free: |
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| 95 | save = errno; |
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| 96 | FREE(new); |
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| 97 | errno = save; |
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| 98 | return (-1); |
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| 99 | } |
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| 100 | |
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| 101 | int |
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| 102 | evRead(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt, |
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| 103 | evStreamFunc func, void *uap, evStreamID *id) |
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| 104 | { |
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| 105 | evContext_p *ctx = opaqueCtx.opaque; |
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| 106 | evStream *new; |
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| 107 | int save; |
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| 108 | |
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| 109 | OKNEW(new); |
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| 110 | new->func = func; |
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| 111 | new->uap = uap; |
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| 112 | new->fd = fd; |
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| 113 | new->flags = 0; |
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| 114 | if (evSelectFD(opaqueCtx, fd, EV_READ, readable, new, &new->file) < 0) |
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| 115 | goto free; |
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| 116 | if (copyvec(new, iov, iocnt) < 0) |
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| 117 | goto free; |
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| 118 | new->prevDone = NULL; |
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| 119 | new->nextDone = NULL; |
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| 120 | if (ctx->streams != NULL) |
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| 121 | ctx->streams->prev = new; |
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| 122 | new->prev = NULL; |
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| 123 | new->next = ctx->streams; |
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| 124 | ctx->streams = new; |
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| 125 | if (id) |
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| 126 | id->opaque = new; |
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| 127 | return (0); |
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| 128 | free: |
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| 129 | save = errno; |
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| 130 | FREE(new); |
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| 131 | errno = save; |
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| 132 | return (-1); |
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| 133 | } |
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| 134 | |
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| 135 | int |
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| 136 | evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ { |
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| 137 | evStream *str = id.opaque; |
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| 138 | |
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| 139 | UNUSED(opaqueCtx); |
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| 140 | |
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| 141 | str->timer = timer; |
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| 142 | str->flags |= EV_STR_TIMEROK; |
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| 143 | return (0); |
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| 144 | } |
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| 145 | |
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| 146 | int |
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| 147 | evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ { |
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| 148 | evStream *str = id.opaque; |
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| 149 | |
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| 150 | UNUSED(opaqueCtx); |
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| 151 | |
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| 152 | str->flags &= ~EV_STR_TIMEROK; |
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| 153 | return (0); |
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| 154 | } |
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| 155 | |
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| 156 | int |
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| 157 | evCancelRW(evContext opaqueCtx, evStreamID id) { |
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| 158 | evContext_p *ctx = opaqueCtx.opaque; |
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| 159 | evStream *old = id.opaque; |
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| 160 | |
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| 161 | /* |
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| 162 | * The streams list is doubly threaded. First, there's ctx->streams |
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| 163 | * that's used by evDestroy() to find and cancel all streams. Second, |
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| 164 | * there's ctx->strDone (head) and ctx->strLast (tail) which thread |
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| 165 | * through the potentially smaller number of "IO completed" streams, |
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| 166 | * used in evGetNext() to avoid scanning the entire list. |
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| 167 | */ |
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| 168 | |
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| 169 | /* Unlink from ctx->streams. */ |
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| 170 | if (old->prev != NULL) |
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| 171 | old->prev->next = old->next; |
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| 172 | else |
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| 173 | ctx->streams = old->next; |
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| 174 | if (old->next != NULL) |
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| 175 | old->next->prev = old->prev; |
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| 176 | |
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| 177 | /* |
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| 178 | * If 'old' is on the ctx->strDone list, remove it. Update |
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| 179 | * ctx->strLast if necessary. |
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| 180 | */ |
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| 181 | if (old->prevDone == NULL && old->nextDone == NULL) { |
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| 182 | /* |
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| 183 | * Either 'old' is the only item on the done list, or it's |
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| 184 | * not on the done list. If the former, then we unlink it |
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| 185 | * from the list. If the latter, we leave the list alone. |
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| 186 | */ |
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| 187 | if (ctx->strDone == old) { |
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| 188 | ctx->strDone = NULL; |
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| 189 | ctx->strLast = NULL; |
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| 190 | } |
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| 191 | } else { |
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| 192 | if (old->prevDone != NULL) |
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| 193 | old->prevDone->nextDone = old->nextDone; |
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| 194 | else |
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| 195 | ctx->strDone = old->nextDone; |
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| 196 | if (old->nextDone != NULL) |
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| 197 | old->nextDone->prevDone = old->prevDone; |
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| 198 | else |
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| 199 | ctx->strLast = old->prevDone; |
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| 200 | } |
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| 201 | |
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| 202 | /* Deallocate the stream. */ |
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| 203 | if (old->file.opaque) |
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| 204 | evDeselectFD(opaqueCtx, old->file); |
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| 205 | memput(old->iovOrig, sizeof (struct iovec) * old->iovOrigCount); |
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| 206 | FREE(old); |
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| 207 | return (0); |
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| 208 | } |
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| 209 | |
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| 210 | /* Copy a scatter/gather vector and initialize a stream handler's IO. */ |
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| 211 | static int |
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| 212 | copyvec(evStream *str, const struct iovec *iov, int iocnt) { |
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| 213 | int i; |
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| 214 | |
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| 215 | str->iovOrig = (struct iovec *)memget(sizeof(struct iovec) * iocnt); |
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| 216 | if (str->iovOrig == NULL) { |
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| 217 | errno = ENOMEM; |
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| 218 | return (-1); |
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| 219 | } |
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| 220 | str->ioTotal = 0; |
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| 221 | for (i = 0; i < iocnt; i++) { |
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| 222 | str->iovOrig[i] = iov[i]; |
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| 223 | str->ioTotal += iov[i].iov_len; |
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| 224 | } |
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| 225 | str->iovOrigCount = iocnt; |
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| 226 | str->iovCur = str->iovOrig; |
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| 227 | str->iovCurCount = str->iovOrigCount; |
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| 228 | str->ioDone = 0; |
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| 229 | return (0); |
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| 230 | } |
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| 231 | |
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| 232 | /* Pull off or truncate lead iovec(s). */ |
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| 233 | static void |
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| 234 | consume(evStream *str, size_t bytes) { |
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| 235 | while (bytes > 0U) { |
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| 236 | if (bytes < (size_t)str->iovCur->iov_len) { |
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| 237 | str->iovCur->iov_len -= bytes; |
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| 238 | str->iovCur->iov_base = (void *) |
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| 239 | ((u_char *)str->iovCur->iov_base + bytes); |
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| 240 | str->ioDone += bytes; |
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| 241 | bytes = 0; |
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| 242 | } else { |
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| 243 | bytes -= str->iovCur->iov_len; |
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| 244 | str->ioDone += str->iovCur->iov_len; |
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| 245 | str->iovCur++; |
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| 246 | str->iovCurCount--; |
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| 247 | } |
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| 248 | } |
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| 249 | } |
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| 250 | |
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| 251 | /* Add a stream to Done list and deselect the FD. */ |
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| 252 | static void |
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| 253 | done(evContext opaqueCtx, evStream *str) { |
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| 254 | evContext_p *ctx = opaqueCtx.opaque; |
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| 255 | |
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| 256 | if (ctx->strLast != NULL) { |
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| 257 | str->prevDone = ctx->strLast; |
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| 258 | ctx->strLast->nextDone = str; |
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| 259 | ctx->strLast = str; |
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| 260 | } else { |
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| 261 | INSIST(ctx->strDone == NULL); |
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| 262 | ctx->strDone = ctx->strLast = str; |
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| 263 | } |
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| 264 | evDeselectFD(opaqueCtx, str->file); |
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| 265 | str->file.opaque = NULL; |
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| 266 | /* evDrop() will call evCancelRW() on us. */ |
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| 267 | } |
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| 268 | |
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| 269 | /* Dribble out some bytes on the stream. (Called by evDispatch().) */ |
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| 270 | static void |
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| 271 | writable(evContext opaqueCtx, void *uap, int fd, int evmask) { |
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| 272 | evStream *str = uap; |
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| 273 | int bytes; |
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| 274 | |
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| 275 | UNUSED(evmask); |
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| 276 | |
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| 277 | bytes = writev(fd, str->iovCur, str->iovCurCount); |
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| 278 | if (bytes > 0) { |
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| 279 | if ((str->flags & EV_STR_TIMEROK) != 0) |
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| 280 | evTouchIdleTimer(opaqueCtx, str->timer); |
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| 281 | consume(str, bytes); |
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| 282 | } else { |
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| 283 | if (bytes < 0 && errno != EINTR) { |
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| 284 | str->ioDone = -1; |
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| 285 | str->ioErrno = errno; |
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| 286 | } |
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| 287 | } |
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| 288 | if (str->ioDone == -1 || str->ioDone == str->ioTotal) |
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| 289 | done(opaqueCtx, str); |
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| 290 | } |
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| 291 | |
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| 292 | /* Scoop up some bytes from the stream. (Called by evDispatch().) */ |
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| 293 | static void |
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| 294 | readable(evContext opaqueCtx, void *uap, int fd, int evmask) { |
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| 295 | evStream *str = uap; |
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| 296 | int bytes; |
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| 297 | |
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| 298 | UNUSED(evmask); |
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| 299 | |
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| 300 | bytes = readv(fd, str->iovCur, str->iovCurCount); |
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| 301 | if (bytes > 0) { |
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| 302 | if ((str->flags & EV_STR_TIMEROK) != 0) |
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| 303 | evTouchIdleTimer(opaqueCtx, str->timer); |
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| 304 | consume(str, bytes); |
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| 305 | } else { |
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| 306 | if (bytes == 0) |
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| 307 | str->ioDone = 0; |
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| 308 | else { |
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| 309 | if (errno != EINTR) { |
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| 310 | str->ioDone = -1; |
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| 311 | str->ioErrno = errno; |
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| 312 | } |
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| 313 | } |
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| 314 | } |
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| 315 | if (str->ioDone <= 0 || str->ioDone == str->ioTotal) |
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| 316 | done(opaqueCtx, str); |
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| 317 | } |
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| 318 | #endif |
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| 319 | |
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| 320 | /*! \file */ |
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