status用法

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

void printf_exit(int status);

int main(int argc, char * * argv, char * * envp)
{
    int status;
    pid_t pid = -1;
    pid = fork();
    if(pid == 0)
    {
        printf("子进程PID=[%d]\n", getpid());
        exit(2);
    }
    else
    {
        printf("父进程PID=[%d]\n", getpid());
        if(wait(&status) != pid) /*因为wait返回终止子进程的进程ID*/
        {
            printf("wait err!\n");
        }
        else
        {
            printf_exit(status);
        }
    }
    printf("============================================================\n");

    pid = fork();
    if(pid == 0)
    {
        printf("子进程PID=[%d]\n", getpid());
        abort();
    }
    else
    {
        printf("父进程PID=[%d]\n", getpid());
        if(wait(&status) != pid) /*因为wait返回终止子进程的进程ID*/
        {
            printf("wait err!\n");
        }
        else
        {
            printf_exit(status);
        }
    }
    printf("============================================================\n");

    pid = fork();
    if(pid == 0)
    {
        printf("子进程PID=[%d]\n", getpid());
        status = status / 0;
    }
    else
    {
        printf("父进程PID=[%d]\n", getpid());
        if(wait(&status) != pid) /*因为wait返回终止子进程的进程ID*/
        {
            printf("wait err!\n");
        }
        else
        {
            printf_exit(status);
        }
    }
    printf("============================================================\n");

    return 0;
}

/********************************************************************
 *功能：打印进程的退出状态
*********************************************************************/
void printf_exit(int status)
{
    printf("函数返回的整形终止状态字=[%d]\n", status);
    if(WIFEXITED(status))
    {
        printf("子进程正常终止！\n");
        printf("退出状态 = [%d]\n", WEXITSTATUS(status));
    }
    else if(WIFSIGNALED(status))
    {
        printf("子进程异常终止！\n");
        printf("signal 号 = [%d]\n", WTERMSIG(status));
        if(WCOREDUMP(status))
        {
            printf("产生core文件！\n");
        }
    }
    else if(WIFSTOPPED(status))
    {
        printf("子进程暂停！\n");
        printf("signal 号 = [%d]\n", WSTOPSIG(status));
    }

}