Linux系统编程_进程编程

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

int main()
{
    // pid_t fork(void);
    printf("before fork,pid:[%d]\n",getpid());
    pid_t pid = fork();
    if( pid<0){
        perror("fork error");
        return -1;
    } else if(pid > 0){
        printf("father:pid==[%d]\n", getpid());
        sleep(1);
    } else if(pid == 0){
        printf("child:pid==[%d]\n",getpid());
    }
    printf("after fork,pid:[%d]\n",getpid());
    return 0;
}

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