Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.24
1.24 ! djm 1: /* $OpenBSD: atomicio.c,v 1.23 2006/08/03 03:34:41 deraadt 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:
1.22 stevesk 29: #include <sys/param.h>
1.23 deraadt 30: #include <sys/uio.h>
1.24 ! djm 31: #include <sys/poll.h>
1.20 stevesk 32:
33: #include <errno.h>
1.21 stevesk 34: #include <string.h>
1.24 ! djm 35: #include <unistd.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
1.17 djm 43: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
1.1 deraadt 44: {
1.3 markus 45: char *s = _s;
1.13 avsm 46: size_t pos = 0;
47: ssize_t res;
1.24 ! djm 48: struct pollfd pfd;
1.1 deraadt 49:
1.24 ! djm 50: pfd.fd = fd;
! 51: pfd.events = f == read ? POLLIN : POLLOUT;
1.1 deraadt 52: while (n > pos) {
53: res = (f) (fd, s + pos, n - pos);
54: switch (res) {
55: case -1:
1.24 ! djm 56: if (errno == EINTR)
1.1 deraadt 57: continue;
1.24 ! djm 58: if (errno == EAGAIN) {
! 59: (void)poll(&pfd, 1, -1);
! 60: continue;
! 61: }
1.13 avsm 62: return 0;
1.1 deraadt 63: case 0:
1.13 avsm 64: errno = EPIPE;
65: return pos;
1.1 deraadt 66: default:
1.14 otto 67: pos += (size_t)res;
1.1 deraadt 68: }
69: }
70: return (pos);
1.18 djm 71: }
72:
73: /*
74: * ensure all of data on socket comes through. f==readv || f==writev
75: */
76: size_t
77: atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
78: const struct iovec *_iov, int iovcnt)
79: {
80: size_t pos = 0, rem;
81: ssize_t res;
82: struct iovec iov_array[IOV_MAX], *iov = iov_array;
1.24 ! djm 83: struct pollfd pfd;
1.18 djm 84:
85: if (iovcnt > IOV_MAX) {
86: errno = EINVAL;
87: return 0;
88: }
89: /* Make a copy of the iov array because we may modify it below */
90: memcpy(iov, _iov, iovcnt * sizeof(*_iov));
91:
1.24 ! djm 92: pfd.fd = fd;
! 93: pfd.events = f == readv ? POLLIN : POLLOUT;
1.18 djm 94: for (; iovcnt > 0 && iov[0].iov_len > 0;) {
95: res = (f) (fd, iov, iovcnt);
96: switch (res) {
97: case -1:
1.24 ! djm 98: if (errno == EINTR)
! 99: continue;
! 100: if (errno == EAGAIN) {
! 101: (void)poll(&pfd, 1, -1);
1.18 djm 102: continue;
1.24 ! djm 103: }
1.18 djm 104: return 0;
105: case 0:
106: errno = EPIPE;
107: return pos;
108: default:
109: rem = (size_t)res;
110: pos += rem;
111: /* skip completed iov entries */
112: while (iovcnt > 0 && rem >= iov[0].iov_len) {
113: rem -= iov[0].iov_len;
114: iov++;
115: iovcnt--;
116: }
117: /* This shouldn't happen... */
1.19 djm 118: if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
1.18 djm 119: errno = EFAULT;
120: return 0;
121: }
122: if (iovcnt == 0)
123: break;
124: /* update pointer in partially complete iov */
125: iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
126: iov[0].iov_len -= rem;
127: }
128: }
129: return pos;
1.1 deraadt 130: }
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