1 /* $OpenBSD: atomicio.c,v 1.18 2006/04/16 00:52:55 djm Exp $ */
3 * Copyright (c) 2006 Damien Miller. All rights reserved.
4 * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
5 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
34 * ensure all of data on socket comes through. f==read || f==vwrite
37 atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
44 res = (f) (fd, s + pos, n - pos);
48 if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
50 if (errno == EINTR || errno == EAGAIN)
65 * ensure all of data on socket comes through. f==readv || f==writev
68 atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd,
69 const struct iovec *_iov, int iovcnt)
73 struct iovec iov_array[IOV_MAX], *iov = iov_array;
75 if (iovcnt > IOV_MAX) {
79 /* Make a copy of the iov array because we may modify it below */
80 memcpy(iov, _iov, iovcnt * sizeof(*_iov));
82 for (; iovcnt > 0 && iov[0].iov_len > 0;) {
83 res = (f) (fd, iov, iovcnt);
86 if (errno == EINTR || errno == EAGAIN)
95 /* skip completed iov entries */
96 while (iovcnt > 0 && rem >= iov[0].iov_len) {
97 rem -= iov[0].iov_len;
101 /* This shouldn't happen... */
102 if (rem > iov[0].iov_len || (rem > 0 && iovcnt <= 0)) {
108 /* update pointer in partially complete iov */
109 iov[0].iov_base = ((char *)iov[0].iov_base) + rem;
110 iov[0].iov_len -= rem;