Annotation of src/usr.bin/nc/atomicio.c, Revision 1.4
1.1 ericj 1: /*
2: * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
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:
29: #include <errno.h>
30: #include <unistd.h>
31:
1.3 deraadt 32: ssize_t atomicio(ssize_t (*f)(int, void *, size_t), int fd, void *_s, size_t n);
33:
1.1 ericj 34: /*
35: * ensure all of data on socket comes through. f==read || f==write
36: */
37: ssize_t
1.4 ! deraadt 38: atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
1.1 ericj 39: {
40: char *s = _s;
41: ssize_t res, pos = 0;
42:
43: while (n > pos) {
44: res = (f) (fd, s + pos, n - pos);
45: switch (res) {
46: case -1:
47: if (errno == EINTR || errno == EAGAIN)
48: continue;
49: case 0:
50: return (res);
51: default:
52: pos += res;
53: }
54: }
55: return (pos);
56: }