qfedu-linux-advanced-level/day3/t18.c

#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h> // sleep

int main()
{
    printf("2秒后挂起, 等待信号 SIGINT\n");
    sleep(2);
    if (f = pause() == -1)
    {
        printf("pause error\n");
    }
    else
    {
        printf("pause return\n");
    }
}