I want to monitor a file for changed content.
Polling is generally not a good idea, so I tried dispatch_source.
But it does not work.
Here the code:
static NSString *const kTestPath = @"/tmp/a.test";
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
const char *filename = kTestPath.fileSystemRepresentation;
int fd = open(filename, O_RDONLY);
fcntl(fd, F_SETFL, O_NONBLOCK);
uintptr_t fD = (uintptr_t)fd;
dispatch_queue_t queue =
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
const uint64_t flags = DISPATCH_VNODE_WRITE | DISPATCH_VNODE_LINK;
dispatch_source_t my_source =
dispatch_source_create(DISPATCH_SOURCE_TYPE_VNODE, fD, flags, queue);
dispatch_source_set_event_handler(my_source, ^{ [self fileDidChange]; }
);
dispatch_resume(my_source);
}
- (void)fileDidChange
{
NSLog(@"%s",__FUNCTION__); // never seen
}
- (IBAction)buttonClicked: sender
{
static NSUInteger seqq = 0;
seqq++;
const char *stats_temp_file = "/tmp/a.temp";
FILE *fp = fopen(stats_temp_file, "w");
fprintf(fp, "%lu\n", seqq);
(void)fclose(fp);
const char *filename = kTestPath.fileSystemRepresentation;
int a = rename(stats_temp_file, filename);
}
What am I doing wrong? (Writing directly to kTestPath without rename() also
does not work).
Gerriet.
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
