GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/nc/atomicio.c Lines: 0 15 0.0 %
Date: 2017-11-07 Branches: 0 11 0.0 %

Line Branch Exec Source
1
/* $OpenBSD: atomicio.c,v 1.11 2012/12/04 02:24:47 deraadt Exp $ */
2
/*
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.
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 <errno.h>
30
#include <poll.h>
31
#include <unistd.h>
32
33
#include "atomicio.h"
34
35
/*
36
 * ensure all of data on socket comes through. f==read || f==vwrite
37
 */
38
size_t
39
atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
40
{
41
	char *s = _s;
42
	size_t pos = 0;
43
	ssize_t res;
44
	struct pollfd pfd;
45
46
	pfd.fd = fd;
47
	pfd.events = f == read ? POLLIN : POLLOUT;
48
	while (n > pos) {
49
		res = (f) (fd, s + pos, n - pos);
50
		switch (res) {
51
		case -1:
52
			if (errno == EINTR)
53
				continue;
54
			if ((errno == EAGAIN) || (errno == ENOBUFS)) {
55
				(void)poll(&pfd, 1, -1);
56
				continue;
57
			}
58
			return 0;
59
		case 0:
60
			errno = EPIPE;
61
			return pos;
62
		default:
63
			pos += (size_t)res;
64
		}
65
	}
66
	return (pos);
67
}