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UALARM(3P)			    POSIX Programmer's Manual			       UALARM(3P)

PROLOG
       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME
       ualarm - set the interval timer

SYNOPSIS
       #include <unistd.h>

       useconds_t ualarm(useconds_t useconds, useconds_t interval);

DESCRIPTION
       The  ualarm()  function	shall  cause  the  SIGALRM signal to be generated for the calling
       process after the number of realtime microseconds specified by the useconds  argument  has
       elapsed.   When	the  interval  argument is non-zero, repeated timeout notification occurs
       with a period in microseconds specified by the interval argument. If the notification sig-
       nal, SIGALRM, is not caught or ignored, the calling process is terminated.

       Implementations	may place limitations on the granularity of timer values. For each inter-
       val timer, if the requested timer value requires a finer granularity than the  implementa-
       tion supports, the actual timer value shall be rounded up to the next supported value.

       Interactions between ualarm() and any of the following are unspecified:

	      alarm()
	      nanosleep()
	      setitimer()
	      timer_create()
	      timer_delete()
	      timer_getoverrun()
	      timer_gettime()
	      timer_settime()
	      sleep()

RETURN VALUE
       The  ualarm() function shall return the number of microseconds remaining from the previous
       ualarm() call. If no timeouts are pending or if ualarm() has not previously  been  called,
       ualarm() shall return 0.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       Applications  are  recommended  to  use	nanosleep() if the Timers option is supported, or
       setitimer(),  timer_create(),  timer_delete(),  timer_getoverrun(),  timer_gettime(),   or
       timer_settime() instead of this function.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       alarm(), nanosleep(), setitimer(), sleep(), timer_create(), timer_delete(), timer_getover-
       run(), the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and	reproduced  in	electronic  form  from	IEEE  Std
       1003.1,	2003  Edition,	Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       UALARM(3P)
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