UALARM(3C) Standard C Library Functions UALARM(3C)
- schedule signal after interval in microseconds
SYNOPSIS #include <unistd.h> useconds_t ualarm
, useconds_t interval
() function causes the SIGALRM signal to be generated for the
calling process after the number of real-time 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 signal, SIGALRM,
is not caught or ignored, the calling process is terminated.
Because of scheduling delays, resumption of execution when the signal is
caught may be delayed an arbitrary amount of time.
Interactions between ualarm
() and either alarm(2)
() function returns the number of microseconds remaining from the
() call. If no timeouts are pending or if ualarm
() has not
previously been called, ualarm
() returns 0.
No errors are defined.
() function is a simplified interface to setitimer(2)
, and uses
the ITIMER_REAL interval timer. It's use has been deprecated in favor of
family of functions.
INTERFACE STABILITY Obsolete Standard
SEE ALSO alarm(2)
() function is available in the following compilation
environments. See standards(5)
X/Open Portability Guide Issue 4, Version 2 ("XPG4.2") +o
Version 2 of the Single UNIX Specification ("SUSv2") +o
Version 3 of the Single UNIX Specification ("SUSv3")
It is marked obsolete in Version 3 of the Single UNIX Specification
("SUSv3"), and was removed from IEEE Std 1003.1-2008 ("POSIX.1").
illumos August 16, 2014 illumos