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47 lines
1.8 KiB
47 lines
1.8 KiB
/* An interface to read() that retries after interrupts. |
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Copyright (C) 2002, 2006, 2009-2017 Free Software Foundation, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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/* Some system calls may be interrupted and fail with errno = EINTR in the |
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following situations: |
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- The process is stopped and restarted (signal SIGSTOP and SIGCONT, user |
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types Ctrl-Z) on some platforms: Mac OS X. |
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- The process receives a signal for which a signal handler was installed |
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with sigaction() with an sa_flags field that does not contain |
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SA_RESTART. |
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- The process receives a signal for which a signal handler was installed |
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with signal() and for which no call to siginterrupt(sig,0) was done, |
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on some platforms: AIX, HP-UX, IRIX, OSF/1, Solaris. |
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This module provides a wrapper around read() that handles EINTR. */ |
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#include <stddef.h> |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define SAFE_READ_ERROR ((size_t) -1) |
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/* Read up to COUNT bytes at BUF from descriptor FD, retrying if interrupted. |
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Return the actual number of bytes read, zero for EOF, or SAFE_READ_ERROR |
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upon error. */ |
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extern size_t safe_read (int fd, void *buf, size_t count); |
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#ifdef __cplusplus |
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} |
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#endif
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