Proper usage of kqueue?
Proper usage of kqueue?
- Subject: Proper usage of kqueue?
- From: Will Johansson <email@hidden>
- Date: Tue, 26 Jun 2007 11:28:09 -0500
Hi guys,
I'm trying to play around with kqueue and learning it. Right now I'm
trying to see how I can register both VNODE and PROC for use with one
single kqueue. However, I've had two kernel panics this morning.
First kernel panics I've had on my MacBook since I bought it. I'm
suspecting something's up possibly with my code. If anyone would look
at my code below and comment about it, that'd be appreciated!
#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;
}
EV_SET( &changelist[ 0 ], fd, EVFILT_VNODE, EV_ADD | EV_ONESHOT,
NOTE_DELETE | NOTE_EXTEND | NOTE_WRITE | NOTE_ATTRIB, 0, 0 );
EV_SET( &changelist[ 1 ], 1, EVFILT_PROC, EV_ADD | EV_ONESHOT,
NOTE_EXIT | NOTE_FORK | NOTE_EXEC | NOTE_TRACK, 0, 0 );
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_EXTEND || eventlist
[ 0 ].fflags & NOTE_WRITE ) {
printf( "File modified.\n" );
}
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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