Instructions for alarm, signal, and pause in Linux C

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# Include <unistd. h> # include <stdio. h> # include <signal. h> void myfunc () {printf ("myfunc \ n"); exit (0); // if this sentence does not exist,ProgramContinue running in the main function and output never run} int main () {unsigned int I; int time; Alarm (9); sleep (2); time = alarm (0 ); // when the alarm is canceled, the remaining time is returned. Only one alarm can take effect at a time: printf ("DD % d \ n", time); Alarm (2); signal (sigalrm, myfunc ); // catching signal, get the signal sigalrm returned by the alarm, and run the corresponding program. Pause (); // suspends a process. When a signal is obtained, the signal function is called. If no signal is sent, the default catching function is called and the printf ("Never Run") process is exited "); return 0 ;}

 

 

Output result:

More time: 7
Myfunc
Never run