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 6a48c0cc..00000000 --- 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 | } | ||
