Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 1 | /* $OpenBSD: atomicio.c,v 1.21 2006/07/22 20:48:22 stevesk Exp $ */ |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 2 | /* |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 3 | * Copyright (c) 2006 Damien Miller. All rights reserved. |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 4 | * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. |
Ben Lindstrom | 92a2e38 | 2001-03-05 06:59:27 +0000 | [diff] [blame] | 5 | * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include "includes.h" |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 30 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 31 | #include <errno.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 32 | #include <string.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 33 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 34 | #include "atomicio.h" |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 35 | |
| 36 | /* |
Darren Tucker | 85f04c6 | 2003-08-03 00:05:58 +1000 | [diff] [blame] | 37 | * ensure all of data on socket comes through. f==read || f==vwrite |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 38 | */ |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 39 | size_t |
Damien Miller | 3db7846 | 2006-04-23 12:05:16 +1000 | [diff] [blame] | 40 | atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 41 | { |
Damien Miller | 7684ee1 | 2000-03-17 23:40:15 +1100 | [diff] [blame] | 42 | char *s = _s; |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 43 | size_t pos = 0; |
| 44 | ssize_t res; |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 45 | |
| 46 | while (n > pos) { |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 47 | res = (f) (fd, s + pos, n - pos); |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 48 | switch (res) { |
| 49 | case -1: |
Damien Miller | f2fdbe5 | 2000-07-08 10:57:08 +1000 | [diff] [blame] | 50 | #ifdef EWOULDBLOCK |
| 51 | if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) |
| 52 | #else |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 53 | if (errno == EINTR || errno == EAGAIN) |
Damien Miller | f2fdbe5 | 2000-07-08 10:57:08 +1000 | [diff] [blame] | 54 | #endif |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 55 | continue; |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 56 | return 0; |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 57 | case 0: |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 58 | errno = EPIPE; |
| 59 | return pos; |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 60 | default: |
Damien Miller | 3fd019e | 2006-03-15 11:29:51 +1100 | [diff] [blame] | 61 | pos += (size_t)res; |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 62 | } |
| 63 | } |
| 64 | return (pos); |
| 65 | } |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 66 | |
| 67 | /* |
| 68 | * ensure all of data on socket comes through. f==readv || f==writev |
| 69 | */ |
| 70 | size_t |
| 71 | atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd, |
| 72 | const struct iovec *_iov, int iovcnt) |
| 73 | { |
| 74 | size_t pos = 0, rem; |
| 75 | ssize_t res; |
| 76 | struct iovec iov_array[IOV_MAX], *iov = iov_array; |
| 77 | |
| 78 | if (iovcnt > IOV_MAX) { |
| 79 | errno = EINVAL; |
| 80 | return 0; |
| 81 | } |
| 82 | /* Make a copy of the iov array because we may modify it below */ |
| 83 | memcpy(iov, _iov, iovcnt * sizeof(*_iov)); |
| 84 | |
| 85 | for (; iovcnt > 0 && iov[0].iov_len > 0;) { |
| 86 | res = (f) (fd, iov, iovcnt); |
| 87 | switch (res) { |
| 88 | case -1: |
| 89 | if (errno == EINTR || errno == EAGAIN) |
| 90 | continue; |
| 91 | return 0; |
| 92 | case 0: |
| 93 | errno = EPIPE; |
| 94 | return pos; |
| 95 | default: |
| 96 | rem = (size_t)res; |
| 97 | pos += rem; |
| 98 | /* skip completed iov entries */ |
| 99 | while (iovcnt > 0 && rem >= iov[0].iov_len) { |
| 100 | rem -= iov[0].iov_len; |
| 101 | iov++; |
| 102 | iovcnt--; |
| 103 | } |
| 104 | /* This shouldn't happen... */ |
Damien Miller | b5ea7e7 | 2006-04-23 12:06:49 +1000 | [diff] [blame] | 105 | if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) { |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 106 | errno = EFAULT; |
| 107 | return 0; |
| 108 | } |
| 109 | if (iovcnt == 0) |
| 110 | break; |
| 111 | /* update pointer in partially complete iov */ |
| 112 | iov[0].iov_base = ((char *)iov[0].iov_base) + rem; |
| 113 | iov[0].iov_len -= rem; |
| 114 | } |
| 115 | } |
| 116 | return pos; |
| 117 | } |