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glibc/posix/alarm.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <unistd.h> | |
/* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. | |
If SECONDS is zero, any currently scheduled alarm will be cancelled. | |
The function returns the number of seconds remaining until the last | |
alarm scheduled would have signaled, or zero if there wasn't one. | |
There is no return value to indicate an error, but you can set `errno' | |
to 0 and check its value after calling `alarm', and this might tell you. | |
The signal may come late due to processor scheduling. */ | |
unsigned int | |
alarm (unsigned int seconds) | |
{ | |
__set_errno (ENOSYS); | |
return 0; | |
} | |
libc_hidden_def (alarm) | |
stub_warning (alarm) |