diff options
Diffstat (limited to 'lib/safe-read.c')
| -rw-r--r-- | lib/safe-read.c | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/lib/safe-read.c b/lib/safe-read.c deleted file mode 100644 index 9caf8466..00000000 --- a/lib/safe-read.c +++ /dev/null | |||
| @@ -1,80 +0,0 @@ | |||
| 1 | /* An interface to read and write that retries after interrupts. | ||
| 2 | |||
| 3 | Copyright (C) 1993, 1994, 1998, 2002, 2003, 2004, 2005 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 2, or (at your option) | ||
| 9 | 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, write to the Free Software Foundation, | ||
| 18 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | ||
| 19 | |||
| 20 | #ifdef HAVE_CONFIG_H | ||
| 21 | # include <config.h> | ||
| 22 | #endif | ||
| 23 | |||
| 24 | /* Specification. */ | ||
| 25 | #ifdef SAFE_WRITE | ||
| 26 | # include "safe-write.h" | ||
| 27 | #else | ||
| 28 | # include "safe-read.h" | ||
| 29 | #endif | ||
| 30 | |||
| 31 | /* Get ssize_t. */ | ||
| 32 | #include <sys/types.h> | ||
| 33 | #include <unistd.h> | ||
| 34 | |||
| 35 | #include <errno.h> | ||
| 36 | |||
| 37 | #ifdef EINTR | ||
| 38 | # define IS_EINTR(x) ((x) == EINTR) | ||
| 39 | #else | ||
| 40 | # define IS_EINTR(x) 0 | ||
| 41 | #endif | ||
| 42 | |||
| 43 | #include <limits.h> | ||
| 44 | |||
| 45 | #ifdef SAFE_WRITE | ||
| 46 | # define safe_rw safe_write | ||
| 47 | # define rw write | ||
| 48 | #else | ||
| 49 | # define safe_rw safe_read | ||
| 50 | # define rw read | ||
| 51 | # undef const | ||
| 52 | # define const /* empty */ | ||
| 53 | #endif | ||
| 54 | |||
| 55 | /* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if | ||
| 56 | interrupted. Return the actual number of bytes read(written), zero for EOF, | ||
| 57 | or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error. */ | ||
| 58 | size_t | ||
| 59 | safe_rw (int fd, void const *buf, size_t count) | ||
| 60 | { | ||
| 61 | /* Work around a bug in Tru64 5.1. Attempting to read more than | ||
| 62 | INT_MAX bytes fails with errno == EINVAL. See | ||
| 63 | <http://lists.gnu.org/archive/html/bug-gnu-utils/2002-04/msg00010.html>. | ||
| 64 | When decreasing COUNT, keep it block-aligned. */ | ||
| 65 | enum { BUGGY_READ_MAXIMUM = INT_MAX & ~8191 }; | ||
| 66 | |||
| 67 | for (;;) | ||
| 68 | { | ||
| 69 | ssize_t result = rw (fd, buf, count); | ||
| 70 | |||
| 71 | if (0 <= result) | ||
| 72 | return result; | ||
| 73 | else if (IS_EINTR (errno)) | ||
| 74 | continue; | ||
| 75 | else if (errno == EINVAL && BUGGY_READ_MAXIMUM < count) | ||
| 76 | count = BUGGY_READ_MAXIMUM; | ||
| 77 | else | ||
| 78 | return result; | ||
| 79 | } | ||
| 80 | } | ||
