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1 | /* Copyright (C) 1999 Free Software Foundation, Inc. |
2 | ||
3 | This file is part of GNU Bash, the Bourne Again SHell. | |
4 | ||
5 | Bash is free software; you can redistribute it and/or modify it under | |
6 | the terms of the GNU General Public License as published by the Free | |
7 | Software Foundation; either version 2, or (at your option) any later | |
8 | version. | |
9 | ||
10 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 | for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License along | |
16 | with Bash; see the file COPYING. If not, write to the Free Software | |
17 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ | |
18 | ||
19 | #include <config.h> | |
20 | ||
21 | #include <sys/types.h> | |
22 | ||
23 | #if defined (HAVE_UNISTD_H) | |
24 | # include <unistd.h> | |
25 | #endif | |
26 | ||
27 | #include <errno.h> | |
28 | ||
29 | #if !defined (errno) | |
30 | extern int errno; | |
31 | #endif | |
32 | ||
33 | /* Write NB bytes from BUF to file descriptor FD, retrying the write if | |
34 | it is interrupted. We retry three times if we get a zero-length | |
35 | write. Any other signal causes this function to return prematurely. */ | |
36 | int | |
37 | zwrite (fd, buf, nb) | |
38 | int fd; | |
39 | unsigned char *buf; | |
40 | size_t nb; | |
41 | { | |
42 | int n, i, nt; | |
43 | ||
44 | for (n = nb, nt = 0;;) | |
45 | { | |
46 | i = write (fd, buf, n); | |
47 | if (i > 0) | |
48 | { | |
49 | n -= i; | |
50 | if (n <= 0) | |
51 | return nb; | |
28ef6c31 | 52 | buf += i; |
bb70624e JA |
53 | } |
54 | else if (i == 0) | |
55 | { | |
56 | if (++nt > 3) | |
57 | return (nb - n); | |
58 | } | |
59 | else if (errno != EINTR) | |
60 | return -1; | |
61 | } | |
62 | } |