Content-type: text/html Man page of ualarm

ualarm

Section: Standard C Library Functions (3C)
Updated: 14 Aug 2002
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NAME

ualarm - schedule signal after interval in microseconds  

SYNOPSIS

#include <unistd.h>

useconds_t ualarm(useconds_t useconds, useconds_t interval);  

DESCRIPTION

The ualarm() 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) or sleep(3C) are unspecified.  

RETURN VALUES

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

ERRORS

No errors are defined.  

USAGE

The ualarm() function is a simplified interface to setitimer(2), and uses the ITIMER_REAL interval timer.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard

 

SEE ALSO

alarm(2), setitimer(2), sighold(3C), signal(3C), sleep(3C), usleep(3C), attributes(5), standards(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
USAGE
ATTRIBUTES
SEE ALSO

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Time: 02:37:26 GMT, October 02, 2010