Proper usage of kqueue?

• Subject: Proper usage of kqueue?
• From: Will Johansson <email@hidden>
• Date: Tue, 26 Jun 2007 11:28:09 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Hi guys,

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>

#define NUMBER_OF_CHANGES 2

int main( int argc, char *argv[] ) {
    int fd, queue_id, ev;
    struct kevent changelist[ NUMBER_OF_CHANGES ];
    struct kevent eventlist[ NUMBER_OF_CHANGES ];
    struct timespec * timeout = NULL;

    if( argc != 2 ) {
        fprintf( stderr, "usage: %s [directory]\n", argv[ 0 ] );
        return EXIT_FAILURE;
    }

    printf( "Observing %s\n", argv[ 1 ] );

    queue_id = kqueue();

    if( queue_id < 0 ) {
        perror( "kqueue" );
        return EXIT_FAILURE;
    }

    fd = open( argv[ 1 ], O_RDONLY );

    if( fd < 0 ) {
        perror( "open" );
        return EXIT_FAILURE;
    }

    for( ;; ) {
        ev = kevent( queue_id, changelist, 2, eventlist, 2, timeout );

        printf( "We have %d events registered.\n", ev );

        if( ev < 0 ) {
            perror( "kevent" );
            continue;
        }

        if( eventlist[ 0 ].fflags & NOTE_DELETE ) {
            printf( "File deleted.\n" );
            break;
        }

        if( eventlist[ 0 ].fflags & NOTE_ATTRIB ) {
            printf( "File attributes modified.\n" );
        }

        if( eventlist[ 1 ].fflags & NOTE_FORK ) {
            printf( "launchd forked.\n" );
        }

        if( eventlist[ 1 ].fflags & NOTE_EXIT ) {
            printf( "forked process exited.\n" );
        }

        if( eventlist[ 1 ].fflags & NOTE_EXEC ) {
            printf( "launchd exec'ed.\n" );
        }

        if( eventlist[ 1 ].fflags & NOTE_TRACKERR ) {
            printf( "eeps, not enough resources.\n" );
        }

        if( eventlist[ 1 ].fflags & NOTE_CHILD ) {
            printf( "\tParentPID: %d\n", eventlist[ 1 ].data );
        }

        if( eventlist[ 1 ].fflags & NOTE_TRACK ) {
            printf( "NOTE_TRACK returned from parent.\n" );
        }
    }

    close( queue_id );
    close( fd );

    return EXIT_SUCCESS;
}

Thanks,

Will Johansson
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