sysdeps/unix/bsd/usleep.c

   1 /* Copyright (C) 1992, 1996, 1999, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <unistd.h>
  20 #include <sys/types.h>
  21 #include <sys/time.h>
  22
  23 /* Sleep USECONDS microseconds, or until a previously set timer goes off.  */
  24 int
  25 usleep (useconds)
  26      useconds_t useconds;
  27 {
  28   struct timeval delay;
  29
  30   delay.tv_sec = 0;
  31   delay.tv_usec = useconds;
  32
  33   return __select (0, (fd_set *) NULL, (fd_set *) NULL, (fd_set *) NULL,
  34                    &delay);
  35 }