/* full-write.c -- an interface to write that retries after interrupts
- Copyright (C) 1993 Free Software Foundation, Inc.
+
+ Copyright 1993, 1994, 1997, 1998, 1999, 2000, 2001 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
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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- Copied largely from GNU C's cccp.c.
- */
+ Written by Paul Eggert. */
-#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
- using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
- (which it would do because it found this file in $srcdir). */
-#include <config.h>
-#else
-#include "config.h"
-#endif
+#if HAVE_CONFIG_H
+# include <config.h>
#endif
#include <sys/types.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
+#include "full-write.h"
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
#endif
#include <errno.h>
-#ifndef STDC_HEADERS
+#ifndef errno
extern int errno;
#endif
-/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted.
- Return LEN upon success, write's (negative) error code otherwise. */
+/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted
+ or if partial writes occur. Return the number of bytes successfully
+ written, setting errno if that is less than LEN. */
-int
-full_write (desc, ptr, len)
- int desc;
- char *ptr;
- int len;
+size_t
+full_write (int desc, const char *ptr, size_t len)
{
- int total_written;
+ size_t total_written = 0;
- total_written = 0;
while (len > 0)
{
- int written = write (desc, ptr, len);
- if (written < 0)
+ ssize_t written = write (desc, ptr, len);
+ if (written <= 0)
{
+ /* Some buggy drivers return 0 when you fall off a device's end. */
+ if (written == 0)
+ errno = ENOSPC;
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
- return written;
+ break;
}
total_written += written;
ptr += written;