Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.22
1.22 ! stevesk 1: /* $OpenBSD: atomicio.c,v 1.21 2006/07/22 20:48:22 stevesk 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:
29: #include "includes.h"
1.22 ! stevesk 30:
! 31: #include <sys/param.h>
1.20 stevesk 32:
33: #include <errno.h>
1.21 stevesk 34: #include <string.h>
1.1 deraadt 35:
1.8 markus 36: #include "atomicio.h"
1.1 deraadt 37:
38: /*
1.12 avsm 39: * ensure all of data on socket comes through. f==read || f==vwrite
1.1 deraadt 40: */
1.13 avsm 41: size_t
1.17 djm 42: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
1.1 deraadt 43: {
1.3 markus 44: char *s = _s;
1.13 avsm 45: size_t pos = 0;
46: ssize_t res;
1.1 deraadt 47:
48: while (n > pos) {
49: res = (f) (fd, s + pos, n - pos);
50: switch (res) {
51: case -1:
52: if (errno == EINTR || errno == EAGAIN)
53: continue;
1.13 avsm 54: return 0;
1.1 deraadt 55: case 0:
1.13 avsm 56: errno = EPIPE;
57: return pos;
1.1 deraadt 58: default:
1.14 otto 59: pos += (size_t)res;
1.1 deraadt 60: }
61: }
62: return (pos);
1.18 djm 63: }
64:
65: /*
66: * ensure all of data on socket comes through. f==readv || f==writev
67: */
68: size_t
69: atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
70: const struct iovec *_iov, int iovcnt)
71: {
72: size_t pos = 0, rem;
73: ssize_t res;
74: struct iovec iov_array[IOV_MAX], *iov = iov_array;
75:
76: if (iovcnt > IOV_MAX) {
77: errno = EINVAL;
78: return 0;
79: }
80: /* Make a copy of the iov array because we may modify it below */
81: memcpy(iov, _iov, iovcnt * sizeof(*_iov));
82:
83: for (; iovcnt > 0 && iov[0].iov_len > 0;) {
84: res = (f) (fd, iov, iovcnt);
85: switch (res) {
86: case -1:
87: if (errno == EINTR || errno == EAGAIN)
88: continue;
89: return 0;
90: case 0:
91: errno = EPIPE;
92: return pos;
93: default:
94: rem = (size_t)res;
95: pos += rem;
96: /* skip completed iov entries */
97: while (iovcnt > 0 && rem >= iov[0].iov_len) {
98: rem -= iov[0].iov_len;
99: iov++;
100: iovcnt--;
101: }
102: /* This shouldn't happen... */
1.19 djm 103: if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
1.18 djm 104: errno = EFAULT;
105: return 0;
106: }
107: if (iovcnt == 0)
108: break;
109: /* update pointer in partially complete iov */
110: iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
111: iov[0].iov_len -= rem;
112: }
113: }
114: return pos;
1.1 deraadt 115: }