UALARM(3P) POSIX Programmer's Manual UALARM(3P)
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.
ualarm - set the interval timer
useconds_t ualarm(useconds_t useconds, useconds_t interval);
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:
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.
No errors are defined.
The following sections are informative.
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.
alarm(), nanosleep(), setitimer(), sleep(), timer_create(), timer_delete(), timer_getover-
run(), the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>
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)