inotify，inotify_add_watch()用于监视多个目录，c++

Question

我使用inotify和表()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，但没有收到任何通知。

样本代码：

#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-1”

“/home/Dir-2”

“/home/Dir-3”。。。

或者添加多个目录的其他选项？

Answer 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。

您应该将循环改为如下所示：

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;
    }
}