fork()与vfork()的区别

最新推荐文章于 2024-01-17 15:20:07 发布

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本文通过两个示例程序对比了fork()与vfork()系统调用的行为差异。具体展示了父进程与子进程在变量共享及执行顺序上的不同表现。

//fork():

#include<unistd.h>
#include<stdio.h>
void main(){
   pid_t pid;
   int i=0;
   //pid=vfork();
   pid=fork();
   if(pid<0)
     printf("error");
   else if(pid==0){
      i++;
     printf("i am the child process,id is %d my father is%d\n",getpid(),getppid());
     printf("child say:i is %d\n",i);
     exit(0);
    }
   else{
     i++;
     printf("i am the parent process,id is %d\n",getpid());
     printf("parent say:i is %d\n",i);}
}

运行结果：

i am the parent process,id is 3247
parent say:i is 1
i am the child process,id is 3248 my father is3247
child say:i is 1

//vfork():

#include<unistd.h>
#include<stdio.h>
void main(){
   pid_t pid,pit;
   int i=0;
   pid=vfork();
   //pid=fork();
   if(pid<0)
     printf("error");
   else if(pid==0){
      i++;
     printf("i am the child process,id is %d my father is%d\n",getpid(),getppid());
     printf("child say:i is %d\n",i);
     exit(0);
    }
   else{
     i++;
     printf("i am the parent process,id is %d\n",getpid());
     printf("parent say:i is %d\n",i);}
}