debuggers.hg

view tools/blktap2/drivers/atomicio.c @ 22848:6341fe0f4e5a

Added tag 4.1.0-rc2 for changeset 9dca60d88c63
author Keir Fraser <keir@xen.org>
date Tue Jan 25 14:06:55 2011 +0000 (2011-01-25)
parents 1c627434605e
children
line source
1 /*
2 * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
3 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
27 #include <stdlib.h>
28 #include <errno.h>
29 #include "atomicio.h"
31 /*
32 * ensure all of data on socket comes through. f==read || f==vwrite
33 */
34 size_t
35 atomicio(f, fd, _s, n)
36 ssize_t (*f) (int, void *, size_t);
37 int fd;
38 void *_s;
39 size_t n;
40 {
41 char *s = _s;
42 size_t pos = 0;
43 ssize_t res;
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;
51 return 0;
52 case 0:
53 errno = EPIPE;
54 return pos;
55 default:
56 pos += (size_t)res;
57 }
58 }
59 return (pos);
60 }