Annotation of /tags/mkinitrd-6_1_11/busybox/libbb/full_write.c
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Wed Oct 28 13:31:19 2009 UTC (14 years, 10 months ago) by niro
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Wed Oct 28 13:31:19 2009 UTC (14 years, 10 months ago) by niro
File MIME type: text/plain
File size: 825 byte(s)
tagged 'mkinitrd-6_1_11'
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * Utility routines. | ||
4 | * | ||
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> | ||
6 | * | ||
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. | ||
8 | */ | ||
9 | |||
10 | #include "libbb.h" | ||
11 | |||
12 | /* | ||
13 | * Write all of the supplied buffer out to a file. | ||
14 | * This does multiple writes as necessary. | ||
15 | * Returns the amount written, or -1 on an error. | ||
16 | */ | ||
17 | niro | 816 | ssize_t FAST_FUNC full_write(int fd, const void *buf, size_t len) |
18 | niro | 532 | { |
19 | ssize_t cc; | ||
20 | ssize_t total; | ||
21 | |||
22 | total = 0; | ||
23 | |||
24 | while (len) { | ||
25 | cc = safe_write(fd, buf, len); | ||
26 | |||
27 | niro | 816 | if (cc < 0) { |
28 | if (total) { | ||
29 | /* we already wrote some! */ | ||
30 | /* user can do another write to know the error code */ | ||
31 | return total; | ||
32 | } | ||
33 | niro | 532 | return cc; /* write() returns -1 on failure. */ |
34 | niro | 816 | } |
35 | niro | 532 | |
36 | total += cc; | ||
37 | buf = ((const char *)buf) + cc; | ||
38 | len -= cc; | ||
39 | } | ||
40 | |||
41 | return total; | ||
42 | } |