MirBSD manpage: alarm(3)

ALARM(3)                   BSD Programmer's Manual                    ALARM(3)

NAME

     alarm - set signal timer alarm

SYNOPSIS

     #include <unistd.h>

     unsigned int
     alarm(unsigned int seconds);

DESCRIPTION

     This interface is made obsolete by setitimer(2).

     The alarm() function waits a count of seconds before asserting the ter-
     minating signal SIGALRM. When the signal has successfully been caught,
     alarm() returns the amount of time left on the clock. The maximum number
     of seconds allowed is 100000000.

     If an alarm has been set with alarm(), another call to alarm() will su-
     persede the prior call. The request alarm(0) voids the current alarm.

RETURN VALUES

     If the call succeeds, any time left remaining from a previous call is re-
     turned. If an error occurs, the value -1 is returned, and a more precise
     error code is placed in the global variable errno.

SEE ALSO

     setitimer(2), sigaction(2), signal(3), sigpause(3), sigvec(3), sleep(3),
     ualarm(3), usleep(3)

STANDARDS

     The alarm() function conforms to IEEE Std 1003.1-1990 ("POSIX.1").

HISTORY

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

MirBSD #10-current              April 19, 1994                               1

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