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1/* An interface to read() that retries after interrupts.
2 Copyright (C) 2002, 2006, 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 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 General Public License for more details.
13
14 You should have received a copy of the GNU 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 read() that handles EINTR. */
29
30#include <stddef.h>
31
32#ifdef __cplusplus
33extern "C" {
34#endif
35
36
37#define SAFE_READ_ERROR ((size_t) -1)
38
39/* Read up to COUNT bytes at BUF from descriptor FD, retrying if interrupted.
40 Return the actual number of bytes read, zero for EOF, or SAFE_READ_ERROR
41 upon error. */
42extern size_t safe_read (int fd, void *buf, size_t count);
43
44
45#ifdef __cplusplus
46}
47#endif