fork函數測試

 

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>

int main(int argc,char **agrv)

{

    pid_t pid;

    char * msg;

    int k;

    printf("Process creation study \n");

    pid = fork();

    switch(pid)

    {

         case 0:

             msg = "child process is running";

             k=3;

             break;

         case -1:

             msg = "error msg..";

             break;

         default:

             msg = "Parent process is running ";

             k=5;

             break;

    }

    while(k>0)

    {

          puts(msg);

          sleep(1);

          k--;

    }

}

執行結果：

[root@localhost pfork]# ./forktest2.bin 

Process creation study 

child process is running

Parent process is running 

child process is running

Parent process is running 

child process is running

Parent process is running 

Parent process is running 

Parent process is running