Contents of /trunk/mkinitrd-magellan/busybox/libbb/full_write.c
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 825 byte(s)
-updated to busybox-1.13.4
1 | /* 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 | ssize_t FAST_FUNC full_write(int fd, const void *buf, size_t len) |
18 | { |
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 | 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 | return cc; /* write() returns -1 on failure. */ |
34 | } |
35 | |
36 | total += cc; |
37 | buf = ((const char *)buf) + cc; |
38 | len -= cc; |
39 | } |
40 | |
41 | return total; |
42 | } |