lib/libc/posix/_sleep.c

   1 /*      sleep() - Sleep for a number of seconds.        Author: Erik van der Kouwe
   2  *                                                              25 July 2009
   3  * (Avoids interfering with alarm/setitimer by using select, like usleep)
   4  */
   5
   6 #include <lib.h>
   7 #define sleep _sleep
   8 #include <unistd.h>
   9 #include <errno.h>
  10 #include <time.h>
  11 #include <sys/select.h>
  12 #include <sys/time.h>
  13
  14 unsigned sleep(unsigned sleep_seconds)
  15 {
  16         struct timespec rqtp, rmtp;
  17
  18         /* nanosleep implements this call; ignore failure, it cannot be reported */
  19         rqtp.tv_sec = sleep_seconds;
  20         rqtp.tv_nsec = 0;
  21         nanosleep(&rqtp, &rmtp);
  22
  23         /* round remainder up to seconds */
  24         return rmtp.tv_sec + ((rmtp.tv_nsec > 0) ? 1 : 0);
  25 }