aboutsummaryrefslogtreecommitdiff
blob: 32f52f1758e9232573745d56e85d756e948e2b7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
/*
 * sb_write.c
 *
 * IO functions.
 *
 * Copyright 1999-2008 Gentoo Foundation
 * Licensed under the GPL-2
 */

#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

#include "sbutil.h"


/* General purpose function to _reliably_ write to a file
 *
 * If returned value is less than count, there was a fatal
 * error and value tells how many bytes were actually written
 */

size_t sb_write(int fd, const void *buf, size_t count)
{
	ssize_t n;
	size_t accum = 0;

	do {
		n = write(fd, buf + accum, count - accum);
		if (n < 0) {
			if (EINTR == errno) {
				/* Reset errno to not trigger DBG_MSG */
				errno = 0;
				continue;
			}

			DBG_MSG("Failed to write to fd=%i!\n", fd);
			break;
		}

		accum += n;
	} while (accum < count);

	return accum;
}