Initial useful code

notifywait.c

@@ -0,0 +1,43 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <CoreServices/CoreServices.h>
+
+void event_cb(ConstFSEventStreamRef streamRef, void *cb_data, size_t count, void *paths,
+              const FSEventStreamEventFlags flags[], const FSEventStreamEventId ids[]) {
+    size_t i;
+
+    for (i = 0; i < count; i++) {
+        /* flags are unsigned long, IDs are uint64_t */
+        printf("Change %llu in %s, flags %lu\n", ids[i], ((char**)paths)[i], (long)flags[i]);
+    }
+
+    if (count > 0) {
+        exit(1);
+    }
+}
+
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        printf("No path to watch specified\n");
+        exit(1);
+    }
+
+    CFStringRef cfs_path = CFStringCreateWithCString(NULL, argv[1], kCFStringEncodingUTF8); /* pretty sure I'm leaking this */
+    CFArrayRef paths = CFArrayCreate(NULL, (const void **)&cfs_path, 1, NULL); /* ditto */
+    void *cb_data = NULL;
+    FSEventStreamRef stream;
+
+    stream = FSEventStreamCreate(NULL, &event_cb, cb_data, paths, kFSEventStreamEventIdSinceNow, 0, kFSEventStreamCreateFlagNone);
+    FSEventStreamScheduleWithRunLoop(stream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
+    FSEventStreamStart(stream);
+
+    CFRunLoopRun();
+    /* We never get here */
+
+    return(0);
+}