#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <linux/inotify.h>
#include <asm/unistd.h>

// Funktions-Wrapper fuer die Systemcalls
static inline int inotify_init (void)
{
    return syscall(__NR_inotify_init);
}

static inline int inotify_add_watch (int fd, const char *name, __u32 mask)
{
    return syscall(__NR_inotify_add_watch, fd, name, mask);
}

static inline int inotify_rm_watch (int fd, __u32 wd)
{
    return syscall(__NR_inotify_rm_watch, fd, wd);
}

// Eigentlicher Programmcode
static char *watch_event( int event )
{
    switch( event ) {
    case IN_ACCESS:
        return "IN_ACCESS";
    case IN_MODIFY:
        return "IN_MODIFY";
    case IN_ATTRIB:
        return "IN_ATTRIB";
    case IN_CLOSE_WRITE:
        return "IN_CLOSE_WRITE";
    case IN_CLOSE_NOWRITE:
        return "IN_CLOSE_NOWRITE";
    case IN_OPEN:
        return "IN_OPEN";
    case IN_MOVED_FROM:
        return "IN_MOVED_FROM";
    case IN_MOVED_TO:
        return "IN_MOVED_TO";
    case IN_CREATE:
        return "IN_CREATE";
    case IN_DELETE:
        return "IN_DELETE";
    case IN_DELETE_SELF:
        return "IN_DELETE_SELF";
    case IN_MOVE_SELF:
        return "IN_MOVE_SELF";
    case IN_UNMOUNT:
        return "IN_UNMOUNT";
    case IN_Q_OVERFLOW:
        return "IN_Q_OVERFLOW";
    case IN_IGNORED:
        return "IN_IGNORED";
    }
    return "unknown";
}

int main( int argc, char **argv )
{
    int fd, watch_descriptor, len, ret;
    struct inotify_event *ie;
    char buf[1000];
       
    if( argc != 2 ) {
        printf("usage: %s path\n", argv[0] );
        exit( -1 );
    }
    fd = inotify_init();
    if( fd<0 ) {
        exit( -2 );
    }
    watch_descriptor = inotify_add_watch(fd, argv[1],
        IN_ALL_EVENTS|IN_UMOUNT);
    while( 1 ) {
        len = read( fd, buf, sizeof(buf) );
        ie = (struct inotify_event *)&buf;
        while( len>0 ) {
            printf("wd=%04x, %16.16s (0x%08x), "
                "cookie=%04x, len=%04x ",
                ie->wd, watch_event(ie->mask),
                ie->mask, ie->cookie, ie->len);
            if( ie->len )
                printf("name=\"%s\"", ie->name );   
            putchar( '\n' );
            len -= sizeof(struct inotify_event)+ie->len;
            ie = (struct inotify_event *) ((char*)ie 
                + sizeof(struct inotify_event)+ie->len);
        }
    }
    ret = inotify_rm_watch (fd, watch_descriptor);
    return 0;
}