inotify,inotify_add_watch() 监控多个目录，c++

Posted 2023-02-17

【中文标题】inotify,inotify_add_watch() 监控多个目录，c++

【英文标题】：inotify,inotify_add_watch() to monitor multiple directories, c++

【发布时间】：2015-10-15 10:53:50

【问题描述】：

我正在使用inotify 和INOTIFY_ADD_WATCH() 来监控多个目录上的活动。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 monitored\n";
    

    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/目录-二"

"/home/目录-三" . . .

或添加多目录的任何替代选项？

【问题讨论】：

您缺少delete[]。

【参考方案1】：

您可以在缓冲区中接收多个事件，但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 %s\n", event->name);

        // Now move to the next event
        event = (struct inotify_event *)((char*)event) + sizeof(*event) + event->len;
    

【讨论】：

hello@wez-furlong，谢谢你的回答，很有帮助。但我仍然在移动到下一个事件时遇到问题/错误，即在 (event = ((char*)event) + sizeof(event) + event->len;) 它说：错误：无法在分配中将 'char' 转换为 'inotify_event*'。