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/*************************************************************************

> File Name: fork5.c

> Author: gaopeng QQ:22389860 all right reserved

> Mail: gaopp_200217@163.com

> Created Time: Sun 02 Jul 2017 02:39:16 AM CST

************************************************************************/

#include

#include

#include

#define MAXPNUM 3

typedef struct handler

{

int* pidarr;

int childnum;

} HANDLER;

int main(void)

{

int i = 0;

int m = 0;

int psre = 0;

HANDLER pidhd;

pidhd.pidarr = (int*)calloc(MAXPNUM+1,sizeof(int));//初始化内存

pidhd.childnum = 0;//初始化进程数量

for(i = 0 ;i

{

m = fork();

if(m == –1)

{

perror(“fork:”);

}

else if( m == 0 )

{

printf(“CHILD: I is child process pid: %d parent process pid: %d n”,getpid(),getppid());

sleep(60);

break;

}

else

{

sleep(1);

pidhd.childnum ++;//进程num+1

*(pidhd.pidarr+i) = m;//指针移动+1

printf(“PARENT: I is parent process pid: %d i fock chlid pid: %d n”,getpid(),m);

}

}

if(i == MAXPNUM)//一定为父进程

{

for(i=0;*(pidhd.pidarr+i);i++)

{

printf(“child process is pid:%dn”,*(pidhd.pidarr+i));

}

}

if(i == MAXPNUM)//一定为父进程

{

printf(“parent pid %d fock child process number is %d finsh!! n”,getpid(),pidhd.childnum);

while(pidhd.childnum > 0)

{

for(i = 0;i< MAXPNUM ;i++) //WNOHANG非堵塞循环回收

{

if(*(pidhd.pidarr+i) != 0 && waitpid(*(pidhd.pidarr+i),&psre,WNOHANG) > 0 )

{

if (WIFEXITED(psre))//是否正常退出获取其退出值

printf(“child %d exit %dn”, *(pidhd.pidarr+i), WEXITSTATUS(psre));

else if (WIFSIGNALED(psre))//是否异常退出信号终止获得信号值

printf(“child %d cancel signal %dn”, *(pidhd.pidarr+i), WTERMSIG(psre));

*(pidhd.pidarr+i) == 0;

pidhd.childnum––;

break;

}

}

}

free(pidhd.pidarr);

}

return 1;//子进程父进程均已return 1 退出

}

输出如下可以捕获子线程由于kill 发信号终止：

▽aopeng@bogon:~/linux0411/process$ ./a.out

CHILD: I is child process pid: 2588 parent process pid: 2587

PARENT: I is parent process pid: 2587 i fock chlid pid: 2588

CHILD: I is child process pid: 2589 parent process pid: 2587

PARENT: I is parent process pid: 2587 i fock chlid pid: 2589

CHILD: I is child process pid: 2590 parent process pid: 2587

PARENT: I is parent process pid: 2587 i fock chlid pid: 2590

child process is pid:2588

child process is pid:2589

child process is pid:2590

parent pid 2587 fock child process number is 3 finsh!!

child 2588 cancel signal 9

child 2589 cancel signal 15

child 2590 cancel signal 11

可以捕获正常终止

gaopeng@bogon:~/linux0411/process$ ./a.out

CHILD: I is child process pid: 2597 parent process pid: 2596

PARENT: I is parent process pid: 2596 i fock chlid pid: 2597

CHILD: I is child process pid: 2598 parent process pid: 2596

PARENT: I is parent process pid: 2596 i fock chlid pid: 2598

CHILD: I is child process pid: 2599 parent process pid: 2596

PARENT: I is parent process pid: 2596 i fock chlid pid: 2599

child process is pid:2597

child process is pid:2598

child process is pid:2599

parent pid 2596 fock child process number is 3 finsh!!

child 2599 cancel signal 1

child 2597 exit 1

child 2598 exit 1

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