alarm

   Sends the signal SIGALRM (defined in the <signal.h> header file)
   to the invoking process after the number of seconds indicated by
   its argument has elapsed.

   Format

     #include  <unistd.h>

     unsigned int alarm  (unsigned int seconds); (ISO POSIX-1)

     int alarm  (unsigned int seconds); (Compatibility)
 

Additional information available:

Argument        Description     Return_Value