| /* An interface to read() that retries after interrupts. |
| Copyright (C) 2002, 2006, 2009-2011 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: MacOS 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 read() that handles EINTR. */ |
| |
| #include <stddef.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| #define SAFE_READ_ERROR ((size_t) -1) |
| |
| /* Read up to COUNT bytes at BUF from descriptor FD, retrying if interrupted. |
| Return the actual number of bytes read, zero for EOF, or SAFE_READ_ERROR |
| upon error. */ |
| extern size_t safe_read (int fd, void *buf, size_t count); |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |