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/* full-write.c -- an interface to write that retries after interrupts
Copyright (C) 1993, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA.
Copied largely from GNU C's cccp.c.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#ifdef 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.
Return LEN upon success, write's (negative) error code otherwise. */
int
full_write (desc, ptr, len)
int desc;
char *ptr;
size_t len;
{
int total_written;
total_written = 0;
while (len > 0)
{
int written = write (desc, ptr, len);
if (written < 0)
{
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
return written;
}
total_written += written;
ptr += written;
len -= written;
}
return total_written;
}
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