Linux中atfork的使用

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#include <pthread.h>

int pthread_atfork(void (*prepare)(void), void (*parent)(void),
void (*child)(void));

调用fork时，内部创建子进程前在父进程中会调用prepare，内部创建子进程成功后，父进程会调用parent,子进程会调用child。

看个例子

#include <stdio.h>#include <time.h>#include <pthread.h>#include <unistd.h>void prepare(void){printf("pid = %d prepare ...\n", static_cast<int>(getpid()));}void parent(void){printf("pid = %d parent ...\n", static_cast<int>(getpid()));}void child(void){printf("pid = %d child ...\n", static_cast<int>(getpid()));}int main(void){printf("pid = %d Entering main ...\n", static_cast<int>(getpid()));pthread_atfork(prepare, parent, child);fork();printf("pid = %d Exiting main ...\n",static_cast<int>(getpid()));return 0;}

运行结果
pid = 24113 Entering main

pid =24113 prepare...

pid =24114 child...

pid=24114 Exiting main....

pid=24113 parent....

pid=24113 Exiting main....

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