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9b36a80c | 1 | /* An interface to read() that retries after interrupts. |
f0007cad | 2 | Copyright (C) 2002, 2006, 2009-2012 Free Software Foundation, Inc. |
9b36a80c LC |
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 | ||
35428fb6 LC |
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: MacOS 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 | ||
9b36a80c LC |
30 | #include <stddef.h> |
31 | ||
32 | #ifdef __cplusplus | |
33 | extern "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. */ | |
42 | extern size_t safe_read (int fd, void *buf, size_t count); | |
43 | ||
44 | ||
45 | #ifdef __cplusplus | |
46 | } | |
47 | #endif |