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glibc  2.9
usleep.c
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00001 /* Copyright (C) 1992, 1996, 1999, 2001 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <unistd.h>
00020 #include <sys/types.h>
00021 #include <sys/time.h>
00022 
00023 /* Sleep USECONDS microseconds, or until a previously set timer goes off.  */
00024 int
00025 usleep (useconds)
00026      useconds_t useconds;
00027 {
00028   struct timeval delay;
00029 
00030   delay.tv_sec = 0;
00031   delay.tv_usec = useconds;
00032 
00033   return __select (0, (fd_set *) NULL, (fd_set *) NULL, (fd_set *) NULL,
00034                  &delay);
00035 }