Annotation of src/usr.bin/ssh/atomicio.c, Revision 1.20
1.20 ! stevesk 1: /* $OpenBSD: atomicio.c,v 1.19 2006/04/16 07:59:00 djm 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"
1.20 ! stevesk 30:
! 31: #include <errno.h>
1.1 deraadt 32:
1.8 markus 33: #include "atomicio.h"
1.1 deraadt 34:
35: /*
1.12 avsm 36: * ensure all of data on socket comes through. f==read || f==vwrite
1.1 deraadt 37: */
1.13 avsm 38: size_t
1.17 djm 39: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
1.1 deraadt 40: {
1.3 markus 41: char *s = _s;
1.13 avsm 42: size_t pos = 0;
43: ssize_t res;
1.1 deraadt 44:
45: while (n > pos) {
46: res = (f) (fd, s + pos, n - pos);
47: switch (res) {
48: case -1:
49: if (errno == EINTR || errno == EAGAIN)
50: continue;
1.13 avsm 51: return 0;
1.1 deraadt 52: case 0:
1.13 avsm 53: errno = EPIPE;
54: return pos;
1.1 deraadt 55: default:
1.14 otto 56: pos += (size_t)res;
1.1 deraadt 57: }
58: }
59: return (pos);
1.18 djm 60: }
61:
62: /*
63: * ensure all of data on socket comes through. f==readv || f==writev
64: */
65: size_t
66: atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
67: const struct iovec *_iov, int iovcnt)
68: {
69: size_t pos = 0, rem;
70: ssize_t res;
71: struct iovec iov_array[IOV_MAX], *iov = iov_array;
72:
73: if (iovcnt > IOV_MAX) {
74: errno = EINVAL;
75: return 0;
76: }
77: /* Make a copy of the iov array because we may modify it below */
78: memcpy(iov, _iov, iovcnt * sizeof(*_iov));
79:
80: for (; iovcnt > 0 && iov[0].iov_len > 0;) {
81: res = (f) (fd, iov, iovcnt);
82: switch (res) {
83: case -1:
84: if (errno == EINTR || errno == EAGAIN)
85: continue;
86: return 0;
87: case 0:
88: errno = EPIPE;
89: return pos;
90: default:
91: rem = (size_t)res;
92: pos += rem;
93: /* skip completed iov entries */
94: while (iovcnt > 0 && rem >= iov[0].iov_len) {
95: rem -= iov[0].iov_len;
96: iov++;
97: iovcnt--;
98: }
99: /* This shouldn't happen... */
1.19 djm 100: if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) {
1.18 djm 101: errno = EFAULT;
102: return 0;
103: }
104: if (iovcnt == 0)
105: break;
106: /* update pointer in partially complete iov */
107: iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
108: iov[0].iov_len -= rem;
109: }
110: }
111: return pos;
1.1 deraadt 112: }