workbench/network/stacks/AROSTCP/netlib/usleep.c

   1 /* $Id$
   2  *
   3  *      usleep.c - suspend process for the specified time
   4  *
   5  *      Copyright © 1994 AmiTCP/IP Group,
   6  *                       Network Solutions Development Inc.
   7  *                       All rights reserved.
   8  */
   9
  10 #include <sys/param.h>
  11 #include <unistd.h>
  12 #include <sys/time.h>
  13 #include <sys/socket.h>
  14
  15 /****** net.lib/usleep *********************************************
  16
  17     NAME
  18         usleep - suspend process execution for the specified time
  19
  20     SYNOPSIS
  21         void usleep(unsigned int microseconds);
  22
  23     FUNCTION
  24         Process execution is suspended for number of microseconds
  25         specified in 'microseconds'. The sleep will be aborted if any
  26         of the break signals specified for the process is received
  27         (only CTRL-C by default).
  28
  29     PORTABILITY
  30         UNIX
  31
  32     INPUTS
  33         'microseconds' - number of microseconds to sleep.
  34
  35     RESULT
  36         Does not return a value.
  37
  38     NOTES
  39         The sleep is implemented as a single select() call with all other
  40         than time out argument as NULL.
  41
  42     SEE ALSO
  43         bsdsocket.library/select()
  44
  45 *****************************************************************************
  46 *
  47 */
  48
  49 void usleep(unsigned int usecs)
  50 {
  51   struct timeval tv;
  52
  53   tv.tv_sec = 0;
  54   while (usecs >= 1000000) {
  55     usecs -= 1000000;
  56     tv.tv_sec++;
  57   }
  58   tv.tv_usec = usecs;
  59   select(0, 0, 0, 0, &tv);
  60 }