+++ /dev/null
-/* An interface to read and write that retries after interrupts.
-
- Copyright (C) 1993, 1994, 1998, 2002, 2003, 2004, 2005, 2006 Free
- Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <config.h>
-
-/* Specification. */
-#ifdef SAFE_WRITE
-# include "safe-write.h"
-#else
-# include "safe-read.h"
-#endif
-
-/* Get ssize_t. */
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <errno.h>
-
-#ifdef EINTR
-# define IS_EINTR(x) ((x) == EINTR)
-#else
-# define IS_EINTR(x) 0
-#endif
-
-#include <limits.h>
-
-#ifdef SAFE_WRITE
-# define safe_rw safe_write
-# define rw write
-#else
-# define safe_rw safe_read
-# define rw read
-# undef const
-# define const /* empty */
-#endif
-
-/* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if
- interrupted. Return the actual number of bytes read(written), zero for EOF,
- or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error. */
-size_t
-safe_rw (int fd, void const *buf, size_t count)
-{
- /* Work around a bug in Tru64 5.1. Attempting to read more than
- INT_MAX bytes fails with errno == EINVAL. See
- <http://lists.gnu.org/archive/html/bug-gnu-utils/2002-04/msg00010.html>.
- When decreasing COUNT, keep it block-aligned. */
- enum { BUGGY_READ_MAXIMUM = INT_MAX & ~8191 };
-
- for (;;)
- {
- ssize_t result = rw (fd, buf, count);
-
- if (0 <= result)
- return result;
- else if (IS_EINTR (errno))
- continue;
- else if (errno == EINVAL && BUGGY_READ_MAXIMUM < count)
- count = BUGGY_READ_MAXIMUM;
- else
- return result;
- }
-}