C waitpid

//main.c
#include<stdio.h>
#include<pthread.h>

int main(int argc, char *argv[]) {
    pid_t pid = fork();
    int status;

    if (pid == 0) {
       printf("pid == 0 execvp\n");
       execvp ("/home/daichenghui/c/os/child_process.o", NULL);
       //printf("pid == 0\n"); //这一句不会被执行
    } else if (pid > 0) {
       printf("parent process begin to wait...\n");
       waitpid(pid, &status, 0);
       printf("parent end\n");
    } else {
        printf("fork error!\n");
    }
}

// child_pocess.c
#include<stdio.h>

int main(int argc, char *argv) {
    int time = 10;
    while (time--) {
        printf("child process i:%d\n", time);
        sleep(1);
    }

    printf("child process exit\n");
}

parent process begin to wait...
pid == 0 execvp
child process i:9
child process i:8
child process i:7
child process i:6
child process i:5
child process i:4
child process i:3
child process i:2
child process i:1
child process i:0
child process exit
parent end