问题描述
我正在尝试检查在特定目录中创建或删除的新事件。 如果事件被创建，则需要使用线程进行一些操作，并且该线程应该处于启动 wile 循环中。 主线程应该寻找另一个事件创建或删除。
我已经开发了应用程序，但我无法创建第二个事件。 代码流始终在子线程中。
请找到以下代码：
#include <errno.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <string.h>
#define PATH_MAX 4096
#define O_RDONLY 00
int main()
{
//char buf;
char buf[4096]
__attribute__ ((aligned(__alignof__(struct inotify_event))));
int fd,i,poll_num;
int *wd;
nfds_t nfds;
struct pollfd fds[0];
char *device_path = "/home/home/test";
ssize_t len;
const struct inotify_event *event;
int counter=0;
char getdata[10];
char devname[PATH_MAX];
char *filename;
int thread_ret = 0;
static pthread_t inotify_pthread;
/* Create the file descriptor for accessing the inotify API */
fd = inotify_init1(IN_NONBLOCK);
printf("fd = %d",fd);
if (fd == -1) {
perror("inotify_init1");
exit(EXIT_FAILURE);
}
/* Mark directories for events
- file was opened
- file was closed */
wd = inotify_add_watch(fd,device_path,IN_OPEN | IN_CLOSE | IN_CREATE | IN_DELETE);
printf("wd = %d ",wd);
if (wd == -1) {
fprintf(stderr,"Cannot watch '%s': %s\n",strerror(errno));
exit(EXIT_FAILURE);
}
/* Prepare for polling */
nfds = 1;
/* Inotify input */
fds[0].fd = fd;
fds[0].events = POLLIN;
/* Wait for events and/or terminal input */
printf("Listening for events.\n");
while (1) {
poll_num = poll(fds,nfds,-1);
if (poll_num == -1) {
if (errno == EINTR)
continue;
perror("poll");
exit(EXIT_FAILURE);
}
if (poll_num > 0) {
if (fds[0].revents & POLLIN) {
/* Inotify events are available */
len = read(fd,buf,sizeof(buf));
if (len == -1 && errno != EAGAIN) {
perror("read");
exit(EXIT_FAILURE);
}
if (len <= 0)
break;
for (char *ptr = buf; ptr < buf + len;
ptr += sizeof(struct inotify_event) + event->len) {
event = (struct inotify_event *) ptr;
if ( event->len ) {
/* Print event type */
if (event->mask & IN_CREATE){
printf("IN_CREATE: \n");
if (event->len){
counter++;
printf("IN_CREATE: created file name : %s,counter no = %d \n",event->name,counter);
thread_ret = pthread_create(&inotify_pthread,NULL,event_read_data(),NULL);
if (thread_ret < 0) {
printf("can't create inotify thread");
exit(EXIT_FAILURE);
}
}
}
else if (event->mask & IN_DELETE){
counter--;
printf( "IN_DELETE : Deleted File name %s,counter );
}
}
printf("counter number : %d \n",counter);
}
}
}
}
printf("Listening for events stopped.\n");
close(fd);
free(wd);
exit(EXIT_SUCCESS);
}
event_read_data(){
while(1){
printf("Child Thread");
sleep(3);
}
}
Compiled like below:
gcc fine_name.c -lpthread
解决方法
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