diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/bsd/ualarm.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/bsd/ualarm.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/bsd/ualarm.c b/REORG.TODO/sysdeps/unix/bsd/ualarm.c new file mode 100644 index 0000000000..133ed86597 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/bsd/ualarm.c @@ -0,0 +1,40 @@ +/* Copyright (C) 1991-2017 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 <sys/time.h> +#include <unistd.h> + +/* Set an alarm to go off (generating a SIGALRM signal) in VALUE microseconds. + If INTERVAL is nonzero, when the alarm goes off, the timer is reset to go + off every INTERVAL microseconds thereafter. + + Returns the number of microseconds remaining before the alarm. */ +useconds_t +ualarm (useconds_t value, useconds_t interval) +{ + struct itimerval timer, otimer; + + timer.it_value.tv_sec = 0; + timer.it_value.tv_usec = value; + timer.it_interval.tv_sec = 0; + timer.it_interval.tv_usec = interval; + + if (__setitimer (ITIMER_REAL, &timer, &otimer) < 0) + return -1; + + return (otimer.it_value.tv_sec * 1000000) + otimer.it_value.tv_usec; +} |