libc/unistd/usleep.c

   1 /*
   2  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   3  *
   4  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   5  */
   6
   7 #include <time.h>
   8 #include <sys/time.h>
   9 #include <sys/types.h>
  10 #include <unistd.h>
  11
  12 #if defined __USE_BSD || defined __USE_POSIX98
  13 #if defined __UCLIBC_HAS_REALTIME__
  14
  15 int usleep (__useconds_t usec)
  16 {
  17         const struct timespec ts = {
  18                 .tv_sec = (long int) (usec / 1000000),
  19                 .tv_nsec = (long int) (usec % 1000000) * 1000ul
  20         };
  21         return nanosleep(&ts, NULL);
  22 }
  23 #else /* __UCLIBC_HAS_REALTIME__ */
  24 int usleep (__useconds_t usec)
  25 {
  26         struct timeval tv;
  27
  28         tv.tv_sec = (long int) (usec / 1000000);
  29         tv.tv_usec = (long int) (usec % 1000000);
  30         return select(0, NULL, NULL, NULL, &tv);
  31 }
  32 #endif /* __UCLIBC_HAS_REALTIME__ */
  33 #endif