/* An interface to write() that retries after interrupts.

   Copyright (C) 2002, 2009-2014 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/>.  */

/* Some system calls may be interrupted and fail with errno = EINTR in the

   following situations:

     - The process is stopped and restarted (signal SIGSTOP and SIGCONT, user

       types Ctrl-Z) on some platforms: Mac OS X.

     - The process receives a signal for which a signal handler was installed

       with sigaction() with an sa_flags field that does not contain

       SA_RESTART.

     - The process receives a signal for which a signal handler was installed

       with signal() and for which no call to siginterrupt(sig,0) was done,

       on some platforms: AIX, HP-UX, IRIX, OSF/1, Solaris.

   This module provides a wrapper around write() that handles EINTR.  */

#include <stddef.h>

#define SAFE_WRITE_ERROR ((size_t) -1)

/* 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.  */

extern size_t safe_write (int fd, const void *buf, size_t count);