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Member "scanssh-2.1/atomicio.c" (18 Feb 2001, 1834 Bytes) of package /linux/privat/old/scanssh-2.1.tar.gz:
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1 /*
2 * Copyright (c) 1999 Theo de Raadt
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/types.h>
27 #include <sys/uio.h>
28 #include <unistd.h>
29 #include <errno.h>
30
31 #include "config.h"
32
33 /*
34 * ensure all of data on socket comes through. f==read || f==write
35 */
36 ssize_t
37 atomicio(f, fd, _s, n)
38 ssize_t (*f) ();
39 int fd;
40 void *_s;
41 size_t n;
42 {
43 char *s = _s;
44 ssize_t res, pos = 0;
45
46 while (n > pos) {
47 res = (f) (fd, s + pos, n - pos);
48 switch (res) {
49 case -1:
50 if (errno == EINTR || errno == EAGAIN)
51 continue;
52 case 0:
53 return (res);
54 default:
55 pos += res;
56 }
57 }
58 return (pos);
59 }