Inotify,inotify_add_watch()监视多个目录，c++

inotify,inotify_add_watch() to monitor multiple directories, c++

本文关键字：监视 c++ inotify add watch Inotify 更新时间：2023-10-16

我使用inotify和INOTIFY_ADD_WATCH()来监视多个目录上的活动。是否可以使用循环添加多个文件路径(目录)。我有以下示例代码，但我没有收到任何通知。

示例代码:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/inotify.h>
#include <vector>
#include <sstream> 
#include <fstream> 
#include <iostream>
#include <cstring>
#define EVENT_SIZE  ( sizeof (struct inotify_event) )
#define BUF_LEN     ( 1024 * ( EVENT_SIZE + 16 ) )
using namespace std;
int main( int argc, char **argv ) 
{
    //---------------------------------------------------
    vector<string> sensitive_dir_path;//a vector to store file path(directory)
    const int max_chars_per_line=200000;
    ifstream fin("secure_file_path.txt");//file containing file paths
    if(!fin.good())
    {
        cout<<"File not found: [file name: 'secure_file_path.txt' not found: "<<endl;
        exit(0);
    }
    while(!fin.eof())//open file and push the lines to a vector
    {
        char buf[max_chars_per_line];
        fin.getline(buf, max_chars_per_line);
        string str(buf);
        if(str.compare("")== 0)
        {
            continue;
        }
        else
        {
            sensitive_dir_path.push_back(str);
        }
    }
    //---------------------------------------------------
    int length, i = 0;
    int fd;
    int wd[sensitive_dir_path.size()];
    char buffer[BUF_LEN];
    fd = inotify_init();
    if ( fd < 0 ) 
    {
        perror( "inotify_init" );
    }
    for(int index=0;index<sensitive_dir_path.size();index++)
    {
        string new_path=sensitive_dir_path[index];
        char* fam_sensitive_dir_path=new char[new_path.length()];
        strcpy(fam_sensitive_dir_path,new_path.c_str());
        wd[index] = inotify_add_watch( fd,fam_sensitive_dir_path, IN_CREATE);
        //cout<<"path: "<<fam_sensitive_dir_path<<"  will be monitoredn";
    }
    while (1)
    {
        struct inotify_event *event;
        length = read( fd, buffer, BUF_LEN );  
        if ( length < 0 ) 
        {
            perror( "read" );
        } 
        event = ( struct inotify_event * ) &buffer[ i ];
        if ( event->len ) 
        {       
            if ( event->mask & IN_CREATE )
            {
                if ( event->mask & IN_ISDIR ) 
                {
                    printf( "The directory %s was created.n", event->name );       
                }
                else 
                {
                    printf( "The file %s was created.n", event->name );
                }
            }
        }
    }
for(int index=0;index<sensitive_dir_path.size();index++)//
{
    ( void ) inotify_rm_watch( fd, wd[index] );
}
    ( void ) close( fd );
    exit( 0 );
}

要读取的文件:

secure_file_path.txt

"/home/Dir-one"

"/home/Dir-two"

"/home/Dir-three"．．.

或任何其他选项来添加多目录?

您可以在缓冲区中接收多个事件，但是您的代码只查看第一个事件。

你应该把你的循环改成这样:

while (1) {
    struct inotify_event *event, *end;
    length = read(fd, buffer, BUF_LEN);  
    if (length < 0) {
        perror( "read" );
        break;
    }
    // Our current event pointer
    event = (struct inotify_event *) &buffer[0];
    // an end pointer so that we know when to stop looping below
    end = (struct inotify_event *) &buffer[length];
    while (event < end) {
        // Do your printing or whatever here
        printf("name is %sn", event->name);
        // Now move to the next event
        event = (struct inotify_event *)((char*)event) + sizeof(*event) + event->len;
    }
}