alarm - set a process alarm clock
unsigned alarm(unsigned sec);
alarm instructs the alarm clock of the calling process to send the signal
SIGALRM to the calling process after the number of real time seconds
specified by sec have elapsed [see signal(2)].
Alarm requests are not stacked; successive calls reset the alarm clock of
the calling process.
If sec is 0, any previously made alarm request is canceled.
fork sets the alarm clock of a new process to 0 [see fork(2)]. A process
created by the exec family of routines inherits the time left on the old
process's alarm clock.
fork(2), exec(2), pause(2), signal(2), sigset(2).
alarm returns the amount of time previously remaining in the alarm clock
of the calling process.
alarm calls reset the itimer clock of the calling process.
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