How to monitor two paths at the same time using inotify instance?

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    void inotifyFunc(char *path, uint32_t *maskPtr, int wd[2]){
        monitor.fd = inotify_init();
        if(fcntl(monitor.fd, F_SETFL, O_NONBLOCK)){
           perror("inotify not initialized: ");
           exit(0);
        }
    
        wd[0] = inotify_add_watch(monitor.fd, path, *maskPtr);
        wd[1] = inotify_add_watch(monitor.fd, path, *maskPtr);
        if(wd[0] < 0 || wd[1] < 0){
            perror("Sorry");
            exit(1);
        }
    
        while(1){
            int i = 0;
            monitor.length = read(monitor.fd, monitor.buffer, BUFFER_LEN);
            while(i<monitor.length){
                struct inotify_event *event = (struct inotify_event *)&monitor.buffer[i];
                if(event->len){
                    if(event->mask & *maskPtr){
                        if(event->mask & IN_ISDIR){
                            printf("Directory is created\n");
                            break;
                        }
                        else{
                           printf("File is created\n");
                           break;
                        }
                    }
                }
            }
        }
    }

**Another function**    

    void monitoringSystem(char *pathname1, char *pathname2){
        monitor.mask[0] = ENOENT;
        monitor.mask[1] = IN_CREATE;
    
        printf("Write the source path: ");
        scanf("%s", pathname1);
        inotifyFunc(pathname1, &monitor.mask[0], &monitor.wd[0]);
    
        printf("Write the destination path: ");
        fgets(pathname1, sizeof(pathname1), stdin);
        inotifyFunc(pathname2, &monitor.mask[0], &monitor.wd[1]);

        printf("\nBoth locations are being monitored\n");
        inotifyFunc(pathname1, &monitor.mask[1], &monitor.wd[0]);
        inotifyFunc(pathname2, &monitor.mask[1], &monitor.wd[1]);
    }

What I have tried:

In these two functions, I am trying to monitor two paths at the same time but the problem is that, whenever I run the program and give it the source path location, then it does not show me the next option that is to enter the destination path. Instead, I press the enter button and write something in the terminal but it does not give me any message. What is the problem here?

Posted 3-Jan-21 5:09am

ibilalkayy

Updated 3-Jan-21 6:30am

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Rick York · Answer 1 · 2021-01-03T06:30:00

Here is your function rewritten so the looping is a little clearer (at least to me it is) :

while(1)
{
    int i = 0;
    monitor.length = read(monitor.fd, monitor.buffer, BUFFER_LEN);
    while(i<monitor.length)
    {
        struct inotify_event *event = (struct inotify_event *)&monitor.buffer[i];
        if(event->len)
        {
            if(event->mask & *maskPtr)
            {
                if(event->mask & IN_ISDIR)
                {
                    printf("Directory is created\n");
                    break;
                }
                else
                {
                   printf("File is created\n");
                   break;
                }
            }
        }
    }
}

The break will cause execution to jump out of the inner loop but not out of the outer while loop. If you run this code in a debugger you will find the code calling read again after the printf is called.