檢測(cè)創(chuàng)建文件或刪除文件會(huì)報(bào)告：信號(hào)處理機(jī)制

#include<stdio.h>
#define _GNU_SOURC
#include<fcntl.h>
#include<stdlib.h>
#include<signal.h>
#include<unistd.h>
static void handler_d(int sig,siginfo_t *s,void* data)
{
	int even_fd,even_pid;
	even_fd=s->si_fd;
	even_pid=s->si_pid;
	printf("process:%d,has deleted something from fd:%d\n",even_pid,even_fd);
}
static void handler_m(int sig,siginfo_t *s,void* data)
{
	int even_fd,even_pid;
	even_fd=s->si_fd;
	even_pid=s->si_pid;
	printf("process:%d,has motified something from fd:%d\n",even_pid,even_fd);
}
int main()
{
	struct sigaction act_d,act_m;
	int fd1,fd2;
	pid_t pid;
	pid=fork();
	if(pid<0)
	{
		printf("error\n");
		exit(1);
	}
	else if(pid==0)
	{//child
		fd1=open("/home/xiaozhi",O_RDONLY);
		if(fd1==-1)
		{
			printf("open /home/xiaozhi fail\n");
		}

		fd2=open("/home/rz",O_RDONLY);
		if(fd2==-1)
		{
			printf("open /home/rz fail\n");
		}
		act_m.sa_sigaction=handler_m;
		sigemptyset(&act_m.sa_mask);
		act_m.sa_flags=SA_SIGINFO;

		sigaction(SIGRTMIN+2,&act_m,NULL);	
		
		fcntl(fd1,F_SETSIG,SIGRTMIN+2);
		fcntl(fd1,F_NOTIFY,DN_MODIFY|DN_MULTISHOT);
		
		fcntl(fd2,F_SETSIG,SIGRTMIN+2);
		fcntl(fd2,F_NOTIFY,DN_MODIFY|DN_MULTISHOT);

		while(1)
		{
			pause();
		}

	}
	else
	{
		//father
		fd1=open("/home/xiaozhi",O_RDONLY);
		if(fd1==-1)
		{
			printf("open /home/xiaozhi fail\n");
		}

		fd2=open("/home/rz",O_RDONLY);
		if(fd2==-1)
	    {
			printf("open /home/rz fail\n");
		}
		act_d.sa_sigaction=handler_d;
		sigemptyset(&act_d.sa_mask);
		act_d.sa_flags=SA_SIGINFO;

		sigaction(SIGRTMIN+1,&act_d,NULL);
		fcntl(fd1,F_SETSIG,SIGRTMIN+1);
		fcntl(fd1,F_NOTIFY,DN_MODIFY|DN_MULTISHOT);
		
		fcntl(fd2,F_SETSIG,SIGRTMIN+1);
		fcntl(fd2,F_NOTIFY,DN_MODIFY|DN_MULTISHOT);
		while(1)
		{
			pause();
		}
	}
}