/*

    File:       kqueue_fragment.c

    Abstract:   Notification example watching for the following VNode events: EV_ADD, EV_ENABLE,

                EV_CLEAR.  When a file system object is created, deleted or renamed the kevent 

                data is displayed through stdout.

    Version:    1.0

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                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

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    Copyright © 2005 Apple Computer, Inc., All Rights Reserved

*/

#include <sys/types.h>

#include <sys/event.h>

#include <sys/time.h>

#include <stdio.h>

#include <stdlib.h>

#include <dirent.h>

#include <string.h>

#include <fcntl.h>

#include <err.h>

#define MY_NOTES (NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB |\

                  NOTE_LINK | NOTE_RENAME | NOTE_REVOKE)

#define IFX(a, x) do { \

        if ((a) & (x)) { printf(#x); a &= ~(x);  if ((a)) printf(", "); }; \

        } while (0)

int

main(int argc, char *argv[])

{

        char *path;

        int nevents;

        int fd;

        int i = 1;

        struct kevent kev;

        int kq;

        if (argc != 2) {

                errx(1, "usage: %s pathname", argv[0]);

        }

        if ((kq = kqueue()) == -1) {

                errx(3, "cannot create kqueue");

        }

        path = strdup(argv[i]);

        if (-1 == (fd = open(path, O_EVTONLY)))

                err(2, "open() on %s failed", path);

        EV_SET(&kev, fd, EVFILT_VNODE, EV_ADD|EV_CLEAR, MY_NOTES, 0, NULL);

        if (kevent(kq, &kev, 1, NULL, 0, NULL) == -1)

                err(4, "cannot add kev to queue");

    while (1) {

        fprintf(stderr, "calling kevent\n");

                nevents = kevent(kq, NULL, 0, &kev, 1, NULL);

                if (nevents == -1)

                        err(5, "cannot wait for event");

                if (nevents > 0) {

                        printf("ident = %ld  ", kev.ident);

                        printf("data = %ld  ", kev.data);

                        printf("udata = %p  ", kev.udata);

                        printf("flags = 0x%08x\n", kev.flags);

                        printf("fflags = { ");

                        IFX(kev.fflags, NOTE_DELETE);

                        IFX(kev.fflags, NOTE_WRITE);

                        IFX(kev.fflags, NOTE_EXTEND);

                        IFX(kev.fflags, NOTE_ATTRIB);

                        IFX(kev.fflags, NOTE_LINK);

                        IFX(kev.fflags, NOTE_RENAME);

                        IFX(kev.fflags, NOTE_REVOKE);

                        printf(" }\n\n");

                }

        }

    /* xxx -- not reached */

        return(0);

}