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fork_kill.c
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fork_kill.c
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#include <stdio.h> // printf()
#include <unistd.h> // fork()
#include <wait.h> // wait()
#include <signal.h> // signal(), kill()
#include <stdlib.h>
#include <string.h>
void pr_exit(int status)
{
// 정상 종료인 경우
if (WIFEXITED(status))
printf("normal termination, exit status = %d\n", WEXITSTATUS(status));
// 시그널에 의해서 종료된 경우
else if (WIFSIGNALED(status))
printf("abnormal termination, signal number = %d%s\n",WTERMSIG(status),
WCOREDUMP(status) ? "(core file generated)" : "");
// 시그널에 의해 STOP된 경우
else if (WIFSTOPPED(status))
printf("child stopped, signal number = %d\n", WSTOPSIG(status));
}
static void sig_killhandler(int signum)
{
printf("sig_killhandler : signum=%d\n",signum);
exit(0);
}
static void sig_inthandler(int signum)
{
printf("sig_inthandler : signum=%d\n",signum);
exit(0);
}
int main(void)
{
int status;
char *temp;
pid_t pid;
temp = strsignal(SIGINT);
printf("%s\n",temp);
temp = strsignal(SIGKILL);
printf("%s\n",temp);
pid=fork();
//자식 프로세스일 경우
if(pid==-1)
{
printf("Error:fork pid=-1");
return -1;
}
else if(pid==0)
{
// handler에 등록이 불가능한 시그널
if(signal(SIGKILL,sig_killhandler)==SIG_ERR)
printf("\ncan't catch SIGKILL\n");
if(signal(SIGINT,sig_inthandler)==SIG_ERR)
printf("\ncan't catch SIGINT\n");
while(1)
{
printf("Hello world\n");
sleep(1);
}
}
else
{
sleep(10);
kill(pid,SIGKILL);
}
wait(&status);
pr_exit(status);
return 0;
}