| 1 | /* An interface to write() that retries after interrupts. |
| 2 | Copyright (C) 2002, 2009-2013 Free Software Foundation, Inc. |
| 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
| 5 | it under the terms of the GNU Lesser General Public License as published by |
| 6 | the Free Software Foundation; either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 16 | |
| 17 | /* Some system calls may be interrupted and fail with errno = EINTR in the |
| 18 | following situations: |
| 19 | - The process is stopped and restarted (signal SIGSTOP and SIGCONT, user |
| 20 | types Ctrl-Z) on some platforms: Mac OS X. |
| 21 | - The process receives a signal for which a signal handler was installed |
| 22 | with sigaction() with an sa_flags field that does not contain |
| 23 | SA_RESTART. |
| 24 | - The process receives a signal for which a signal handler was installed |
| 25 | with signal() and for which no call to siginterrupt(sig,0) was done, |
| 26 | on some platforms: AIX, HP-UX, IRIX, OSF/1, Solaris. |
| 27 | |
| 28 | This module provides a wrapper around write() that handles EINTR. */ |
| 29 | |
| 30 | #include <stddef.h> |
| 31 | |
| 32 | #define SAFE_WRITE_ERROR ((size_t) -1) |
| 33 | |
| 34 | /* Write up to COUNT bytes at BUF to descriptor FD, retrying if interrupted. |
| 35 | Return the actual number of bytes written, zero for EOF, or SAFE_WRITE_ERROR |
| 36 | upon error. */ |
| 37 | extern size_t safe_write (int fd, const void *buf, size_t count); |