signal timer alarm
() function waits a count of
before asserting the terminating
. When the signal has
successfully been caught, alarm
() returns the
amount of time left on the clock. The maximum number of
allowed is 100000000.
If an alarm has been set with alarm
(), another call
() will supersede the prior call. The
voids the current alarm.
If the call succeeds, any time left remaining from a previous call is returned.
If an error occurs, the value -1 is returned, and a more precise error code is
placed in the global variable errno
() function conforms to
IEEE Std 1003.1-2008
() system call appeared in the Programmer's
Workbench (PWB/UNIX) and was ported to Version 7
. For 4.1cBSD
, it was
reimplemented as a wrapper around the