Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.30
1.30 ! dtucker 1: /* $OpenBSD: atomicio.c,v 1.29 2019/01/23 08:01:46 dtucker Exp $ */
1.1 deraadt 2: /*
1.18 djm 3: * Copyright (c) 2006 Damien Miller. All rights reserved.
1.13 avsm 4: * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
1.9 deraadt 5: * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
1.1 deraadt 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:
1.23 deraadt 29: #include <sys/uio.h>
1.20 stevesk 30:
31: #include <errno.h>
1.25 dtucker 32: #include <poll.h>
1.21 stevesk 33: #include <string.h>
1.24 djm 34: #include <unistd.h>
1.27 deraadt 35: #include <limits.h>
1.1 deraadt 36:
1.8 markus 37: #include "atomicio.h"
1.1 deraadt 38:
39: /*
1.12 avsm 40: * ensure all of data on socket comes through. f==read || f==vwrite
1.1 deraadt 41: */
1.13 avsm 42: size_t
1.26 djm 43: atomicio6(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n,
44: int (*cb)(void *, size_t), void *cb_arg)
1.1 deraadt 45: {
1.3 markus 46: char *s = _s;
1.13 avsm 47: size_t pos = 0;
48: ssize_t res;
1.24 djm 49: struct pollfd pfd;
1.1 deraadt 50:
1.24 djm 51: pfd.fd = fd;
52: pfd.events = f == read ? POLLIN : POLLOUT;
1.1 deraadt 53: while (n > pos) {
54: res = (f) (fd, s + pos, n - pos);
55: switch (res) {
56: case -1:
1.30 ! dtucker 57: if (errno == EINTR) {
1.29 dtucker 58: /* possible SIGALARM, update callback */
59: if (cb != NULL && cb(cb_arg, 0) == -1) {
60: errno = EINTR;
61: return pos;
62: }
1.1 deraadt 63: continue;
1.30 ! dtucker 64: } else if (errno == EAGAIN || errno == EWOULDBLOCK) {
1.24 djm 65: (void)poll(&pfd, 1, -1);
66: continue;
67: }
1.13 avsm 68: return 0;
1.1 deraadt 69: case 0:
1.13 avsm 70: errno = EPIPE;
71: return pos;
1.1 deraadt 72: default:
1.14 otto 73: pos += (size_t)res;
1.26 djm 74: if (cb != NULL && cb(cb_arg, (size_t)res) == -1) {
75: errno = EINTR;
76: return pos;
77: }
1.1 deraadt 78: }
79: }
1.26 djm 80: return pos;
81: }
82:
83: size_t
84: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
85: {
86: return atomicio6(f, fd, _s, n, NULL, NULL);
1.18 djm 87: }
88:
89: /*
90: * ensure all of data on socket comes through. f==readv || f==writev
91: */
92: size_t
1.26 djm 93: atomiciov6(ssize_t (*f) (int, const struct iovec *, int), int fd,
94: const struct iovec *_iov, int iovcnt,
95: int (*cb)(void *, size_t), void *cb_arg)
1.18 djm 96: {
97: size_t pos = 0, rem;
98: ssize_t res;
99: struct iovec iov_array[IOV_MAX], *iov = iov_array;
1.24 djm 100: struct pollfd pfd;
1.18 djm 101:
1.28 djm 102: if (iovcnt < 0 || iovcnt > IOV_MAX) {
1.18 djm 103: errno = EINVAL;
104: return 0;
105: }
106: /* Make a copy of the iov array because we may modify it below */
1.28 djm 107: memcpy(iov, _iov, (size_t)iovcnt * sizeof(*_iov));
1.18 djm 108:
1.24 djm 109: pfd.fd = fd;
110: pfd.events = f == readv ? POLLIN : POLLOUT;
1.18 djm 111: for (; iovcnt > 0 && iov[0].iov_len > 0;) {
112: res = (f) (fd, iov, iovcnt);
113: switch (res) {
114: case -1:
1.30 ! dtucker 115: if (errno == EINTR) {
1.29 dtucker 116: /* possible SIGALARM, update callback */
117: if (cb != NULL && cb(cb_arg, 0) == -1) {
118: errno = EINTR;
119: return pos;
120: }
1.24 djm 121: continue;
1.30 ! dtucker 122: } else if (errno == EAGAIN || errno == EWOULDBLOCK) {
1.24 djm 123: (void)poll(&pfd, 1, -1);
1.18 djm 124: continue;
1.24 djm 125: }
1.18 djm 126: return 0;
127: case 0:
128: errno = EPIPE;
129: return pos;
130: default:
131: rem = (size_t)res;
132: pos += rem;
133: /* skip completed iov entries */
134: while (iovcnt > 0 && rem >= iov[0].iov_len) {
135: rem -= iov[0].iov_len;
136: iov++;
137: iovcnt--;
138: }
139: /* This shouldn't happen... */
1.19 djm 140: if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
1.18 djm 141: errno = EFAULT;
142: return 0;
143: }
144: if (iovcnt == 0)
145: break;
146: /* update pointer in partially complete iov */
147: iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
148: iov[0].iov_len -= rem;
149: }
1.26 djm 150: if (cb != NULL && cb(cb_arg, (size_t)res) == -1) {
151: errno = EINTR;
152: return pos;
153: }
1.18 djm 154: }
155: return pos;
1.26 djm 156: }
157:
158: size_t
159: atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
160: const struct iovec *_iov, int iovcnt)
161: {
162: return atomiciov6(f, fd, _iov, iovcnt, NULL, NULL);
1.1 deraadt 163: }
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