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annotate lib/safe-write.h @ 17907:0a1c2535cad9

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euidaccess: Fix Android build * modules/euidaccess (Depends-on): Add fcntl-h to ensure that AT_EACCESS gets declared.
author Kevin Cernekee <cernekee@google.com>
date Wed, 11 Feb 2015 15:22:54 -0800
parents ab58d4870664
children
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1 /* An interface to write() that retries after interrupts.
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2 Copyright (C) 2002, 2009-2015 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 /* Some system calls may be interrupted and fail with errno = EINTR in the
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18 following situations:
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19 - The process is stopped and restarted (signal SIGSTOP and SIGCONT, user
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20 types Ctrl-Z) on some platforms: Mac OS X.
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21 - The process receives a signal for which a signal handler was installed
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22 with sigaction() with an sa_flags field that does not contain
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23 SA_RESTART.
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24 - The process receives a signal for which a signal handler was installed
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25 with signal() and for which no call to siginterrupt(sig,0) was done,
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26 on some platforms: AIX, HP-UX, IRIX, OSF/1, Solaris.
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28 This module provides a wrapper around write() that handles EINTR. */
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29
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30 #include <stddef.h>
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31
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32 #define SAFE_WRITE_ERROR ((size_t) -1)
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33
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34 /* Write up to COUNT bytes at BUF to descriptor FD, retrying if interrupted.
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35 Return the actual number of bytes written, zero for EOF, or SAFE_WRITE_ERROR
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36 upon error. */
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37 extern size_t safe_write (int fd, const void *buf, size_t count);