diff options
Diffstat (limited to 'gl/safe-read.c')
-rw-r--r-- | gl/safe-read.c | 77 |
1 files changed, 0 insertions, 77 deletions
diff --git a/gl/safe-read.c b/gl/safe-read.c deleted file mode 100644 index 6a48c0c..0000000 --- a/gl/safe-read.c +++ /dev/null | |||
@@ -1,77 +0,0 @@ | |||
1 | /* An interface to read and write that retries after interrupts. | ||
2 | |||
3 | Copyright (C) 1993-1994, 1998, 2002-2006, 2009-2013 Free Software | ||
4 | Foundation, Inc. | ||
5 | |||
6 | This program is free software: you can redistribute it and/or modify | ||
7 | it under the terms of the GNU General Public License as published by | ||
8 | the Free Software Foundation; either version 3 of the License, or | ||
9 | (at your option) any later version. | ||
10 | |||
11 | This program is distributed in the hope that it will be useful, | ||
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | GNU General Public License for more details. | ||
15 | |||
16 | You should have received a copy of the GNU General Public License | ||
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | ||
18 | |||
19 | #include <config.h> | ||
20 | |||
21 | /* Specification. */ | ||
22 | #ifdef SAFE_WRITE | ||
23 | # include "safe-write.h" | ||
24 | #else | ||
25 | # include "safe-read.h" | ||
26 | #endif | ||
27 | |||
28 | /* Get ssize_t. */ | ||
29 | #include <sys/types.h> | ||
30 | #include <unistd.h> | ||
31 | |||
32 | #include <errno.h> | ||
33 | |||
34 | #ifdef EINTR | ||
35 | # define IS_EINTR(x) ((x) == EINTR) | ||
36 | #else | ||
37 | # define IS_EINTR(x) 0 | ||
38 | #endif | ||
39 | |||
40 | #include <limits.h> | ||
41 | |||
42 | #ifdef SAFE_WRITE | ||
43 | # define safe_rw safe_write | ||
44 | # define rw write | ||
45 | #else | ||
46 | # define safe_rw safe_read | ||
47 | # define rw read | ||
48 | # undef const | ||
49 | # define const /* empty */ | ||
50 | #endif | ||
51 | |||
52 | /* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if | ||
53 | interrupted. Return the actual number of bytes read(written), zero for EOF, | ||
54 | or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error. */ | ||
55 | size_t | ||
56 | safe_rw (int fd, void const *buf, size_t count) | ||
57 | { | ||
58 | /* Work around a bug in Tru64 5.1. Attempting to read more than | ||
59 | INT_MAX bytes fails with errno == EINVAL. See | ||
60 | <http://lists.gnu.org/archive/html/bug-gnu-utils/2002-04/msg00010.html>. | ||
61 | When decreasing COUNT, keep it block-aligned. */ | ||
62 | enum { BUGGY_READ_MAXIMUM = INT_MAX & ~8191 }; | ||
63 | |||
64 | for (;;) | ||
65 | { | ||
66 | ssize_t result = rw (fd, buf, count); | ||
67 | |||
68 | if (0 <= result) | ||
69 | return result; | ||
70 | else if (IS_EINTR (errno)) | ||
71 | continue; | ||
72 | else if (errno == EINVAL && BUGGY_READ_MAXIMUM < count) | ||
73 | count = BUGGY_READ_MAXIMUM; | ||
74 | else | ||
75 | return result; | ||
76 | } | ||
77 | } | ||