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Simply #define SAFE_WRITE and include safe-read.c.

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This commit is contained in:
Jim Meyering 2002-12-04 07:51:45 +00:00
parent c0ff7df8cb
commit c68d6cafca
1 changed files with 3 additions and 67 deletions
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70
lib/safe-write.c
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@ -1,5 +1,5 @@
/* An interface to write that retries after interrupts.
Copyright (C) 1993, 1994, 1998, 2002 Free Software Foundation, Inc.
Copyright (C) 2002 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
@ -15,69 +15,5 @@
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
/* Specification. */
#include "safe-write.h"
/* Get ssize_t. */
#include <sys/types.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#ifdef EINTR
# define IS_EINTR(x) ((x) == EINTR)
#else
# define IS_EINTR(x) 0
#endif
#include <limits.h>
#ifndef CHAR_BIT
# define CHAR_BIT 8
#endif
/* The extra casts work around common compiler bugs. */
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
It is necessary at least when t == time_t. */
#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
#ifndef INT_MAX
# define INT_MAX TYPE_MAXIMUM (int)
#endif
/* Write up to COUNT bytes at BUF to descriptor FD, retrying if interrupted.
Return the actual number of bytes written, zero for EOF, or SAFE_WRITE_ERROR
upon error. */
size_t
safe_write (int fd, void const *buf, size_t count)
{
ssize_t result;
/* POSIX limits COUNT to SSIZE_MAX, but we limit it further, requiring
that COUNT <= INT_MAX, to avoid triggering a bug in Tru64 5.1.
When decreasing COUNT, keep the file pointer block-aligned.
Note that in any case, write may succeed, yet write fewer than COUNT
bytes, so the caller must be prepared to handle partial results. */
if (count > INT_MAX)
count = INT_MAX & ~8191;
do
{
result = write (fd, buf, count);
}
while (result < 0 && IS_EINTR (errno));
return (size_t) result;
}
#define SAFE_WRITE
#include "safe-read.c"