#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/wait.h>

int main(int argc, char *argv[]){
pid_t cpid, w;
int status;
cpid = fork();
if (cpid == -1){
perror("fork");
exit(EXIT_FAILURE);
}
if(cpid == 0){
printf("Child PID is %ld\n", (long)getpid());
if(argc == 1)
pause();
_exit(atoi(argv[1]));
}
else{
do{
w = waitpid(cpid, &status, WUNTRACED | WCONTINUED);
if(w == -1){
perror("waitpid");
exit(EXIT_FAILURE");
}
if(WIFEXITED(status)){
printf("exited, status=%d\n, WEXITSTATUS(status));
}
else if(WIFSIGNALED(status)){
printf("killed by signal %d\n", WTERMSIG(status));
}
else if (WIFSTOPPED(status)){
printf("stopped by signal %d\n", WSTOPSIG(status));
}
else if (WIFCONTINUED(status)){
printf("continued\n");
}
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
exit(EXIT_SUCCESS);
}
}