下面程式碼主要用於複習，留於此

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/*************************************************************************
> File Name: fork5.c
> Mail: gaopp_200217@163.com
> Created Time: Sun 02 Jul 2017 02:39:16 AM CST
************************************************************************/
#include<stdio.h>
#include<unistd.h>
#include <stdlib.h>
#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));//初始化記憶體
pidhd.childnum = 0;//初始化程式數量
for(i = 0 ;i<MAXPNUM;i++)//迴圈建立
{
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 ++;//程式num+1
*(pidhd.pidarr+i) = m;//指標移動+1
printf("PARENT: I is parent process pid: %d i fock chlid pid: %d \n",getpid(),m);
}
}
if(i == MAXPNUM)//一定為父程式
{
for(i=0;*(pidhd.pidarr+i);i++)
{
printf("child process is pid:%d\n",*(pidhd.pidarr+i));
}
}
if(i == MAXPNUM)//一定為父程式
{
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非堵塞迴圈回收
{
if(*(pidhd.pidarr+i) != 0 && waitpid(*(pidhd.pidarr+i),&psre,WNOHANG) > 0 )
{
if (WIFEXITED(psre))//是否正常退出獲取其退出值
printf("child %d exit %d\n", *(pidhd.pidarr+i), WEXITSTATUS(psre));
else if (WIFSIGNALED(psre))//是否異常退出訊號終止獲得訊號值
printf("child %d cancel signal %d\n", *(pidhd.pidarr+i), WTERMSIG(psre));
*(pidhd.pidarr+i) == 0;
pidhd.childnum--;
break;
}
}
}
free(pidhd.pidarr);
}
return 1;//子程式父程式均已return 1 退出
}

輸出如下可以捕獲子執行緒由於kill 發訊號終止：
▽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
可以捕獲正常終止
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

LINUX C 父程式建立多個子程式迴圈非堵塞回收列子

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