"Linux Learning" Countdown exit, when the process received SIGUSR1 signal start Countdown, 3 seconds after exiting the program.

Topic 3:

Write a program to implement the countdown Exit function, when the process receives the SIGUSR1 signal to start the countdown, 3 seconds after exiting the program.
The process of requiring output from the terminal to receive a signal and start the countdown
Such as:
The process is terminating in 3 sec ...
The process is terminating in 2 sec ...
The process is terminating in 1 sec ...

1#include <sys/types.h>2#include <unistd.h>3#include <signal.h>4#include <stdlib.h>5#include <string.h>6#include <stdio.h>7#include <errno.h>8#include <signal.h>9 Ten intG_tag; One  A voidMyhandle (intnum) - { -printf"recv signal ID num:%d \ n", num); the     if(num = =Ten) -     { -G_tag =0; -     } + } -  + intMainvoid) A { at  -G_tag =1; -  -      -     if(Signal (SIGUSR1, myhandle) = =Sig_err) -     { inPerror ("Signal Err"); -         return 0; to     } +      -      while(1) the     { *         if(G_tag = =0) $         {Panax Notoginsengprintf"The process is terminating in 3 sec ... \ n"); -Sleep1); theprintf"The process is terminating in 2 sec ... \ n"); +Sleep1); Aprintf"The process is terminating in 1 sec ... \ n"); theSleep1); +              Break; -         } $     } $  -      -     return 0; the}

"Linux Learning" Countdown exit, when the process received SIGUSR1 signal start Countdown, 3 seconds after exiting the program.