我在父进程中向子进程发一个信号,执行信号处理函数。
然而函数中getpid()得到的pid仍然是父进程的。
这是怎么一回事呢,不应该是接受到信号的子进程来调用函数处理吗?
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <signal.h>
#include <sys/types.h>
int main()
{
printf("This is farther process,my pid is %d, before signal\n",getpid());
int i,j,k,status;
int func();
signal(18,func()); /*设置18号 信号的处理程序*/
while((i=fork())==-1);
if(i==0)
{
//子进程执行
sleep(6);
printf("Child %d: A signal from my parent is recived.\n",getpid());
}
else
{
//父进程执行
j=kill(i,18); /*向子进程发送信号18*/
printf("Parent: signal 18 has been sent to child %d,returned %d.\n",i,j);
k=wait(&status); //等待子进程结束
printf("After wait %d,Parent %d: finished.\n",k,getpid());
exit(0);
}
}
int func() /*处理程序*/
{
printf("I am Process %d: It is signal 18 processing function.\n",getpid());
return 0;
}