alarm(2) [minix man page]

ALARM(2)							System Calls Manual							  ALARM(2)

NAME

       alarm - schedule signal after specified time

SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds)

DESCRIPTION

       Alarm  causes  signal  SIGALRM,	see sigaction(2), to be sent to the invoking process in a number of seconds given by the argument.  Unless
       caught or ignored, the signal terminates the process.

       Alarm requests are not stacked; successive calls reset the alarm clock.	If the argument is 0, any alarm request is canceled.   Because	of
       scheduling delays, resumption of execution of when the signal is caught may be delayed an arbitrary amount.

       The return value is the amount of time previously remaining in the alarm clock.

SEE ALSO

       pause(2), sigsuspend(2), sigaction(2), sleep(3).

4th Berkeley Distribution					   May 27, 1986 							  ALARM(2)

ALARM(2)						     Linux Programmer's Manual							  ALARM(2)

NAME

       alarm - set an alarm clock for delivery of a signal

SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds);

DESCRIPTION

       alarm() arranges for a SIGALRM signal to be delivered to the calling process in seconds seconds.

       If seconds is zero, no new alarm() is scheduled.

       In any event any previously set alarm() is canceled.

RETURN VALUE

       alarm()	returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no pre-
       viously scheduled alarm.

CONFORMING TO

       SVr4, POSIX.1-2001, 4.3BSD.

NOTES

       alarm() and setitimer(2) share the same timer; calls to one will interfere with use of the other.

       sleep(3) may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is a bad idea.

       Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.

SEE ALSO

       gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3), time(7)

COLOPHON

       This page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-06-12								  ALARM(2)