68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/* full-write.c -- an interface to write that retries after interrupts
|
|
|
|
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
|
|
the Free Software Foundation; either version 2, 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, write to the Free Software Foundation,
|
|
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
Written by Paul Eggert. */
|
|
|
|
#if HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include "full-write.h"
|
|
|
|
#if HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#ifndef errno
|
|
extern int errno;
|
|
#endif
|
|
|
|
/* 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. */
|
|
|
|
size_t
|
|
full_write (int desc, const char *ptr, size_t len)
|
|
{
|
|
size_t total_written = 0;
|
|
|
|
while (len > 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
|
|
break;
|
|
}
|
|
total_written += written;
|
|
ptr += written;
|
|
len -= written;
|
|
}
|
|
return total_written;
|
|
}
|