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NetBSD 6.1.5 - man page for alarm (netbsd section 3)

ALARM(3)			   BSD Library Functions Manual 			 ALARM(3)

NAME
     alarm -- set signal timer alarm

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     unsigned int
     alarm(unsigned int seconds);

DESCRIPTION
     This interface is made obsolete by setitimer(2).

     The alarm() function sets a timer to deliver the signal SIGALRM to the calling process
     seconds after the call to alarm().  If an alarm has already been set with alarm() but has
     not been delivered, another call to alarm() will supersede the prior call.  The request
     alarm(0) voids the current alarm and the signal SIGALRM will not be delivered.  The maximum
     number of seconds allowed is 2147483647.

     The return value of alarm() is the amount of time left on the timer from a previous call to
     alarm().  If no alarm is currently set, the return value is 0.  If there is an error setting
     the timer, alarm() returns ((unsigned int) -1).

SEE ALSO
     setitimer(2), sigaction(2), sigsuspend(2), signal(3), sigvec(3), sleep(3), ualarm(3),
     usleep(3)

STANDARDS
     The alarm() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY
     An alarm() function appeared in Version 7 AT&T UNIX.

BSD					  April 19, 1994				      BSD


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