dispatch_source does not work
dispatch_source does not work
- Subject: dispatch_source does not work
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Wed, 05 Nov 2014 13:50:05 +0700
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.
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