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glibc  2.9
usleep.c
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00001 /* Implementation of the BSD usleep function using nanosleep.
00002    Copyright (C) 1996, 1997, 1999, 2001, 2003 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <time.h>
00022 #include <unistd.h>
00023 
00024 int
00025 usleep (useconds_t useconds)
00026 {
00027   struct timespec ts = { .tv_sec = (long int) (useconds / 1000000),
00028                       .tv_nsec = (long int) (useconds % 1000000) * 1000ul };
00029 
00030   /* Note the usleep() is a cancellation point.  But since we call
00031      nanosleep() which itself is a cancellation point we do not have
00032      to do anything here.  */
00033   return __nanosleep (&ts, NULL);
00034 }