darwintrace: Retry for EBADF when socket is closed

This currently triggers during the gtk3 build, suggesting there's a way
to close the file descriptors that isn't being caught by trace mode.
Work around this by re-establishing the connection when this happens.

src/darwintracelib1.0/darwintrace.c

@@ -580,14 +580,24 @@ static void fsend(const void *restrict buf, size_t size) {
 	 * a way to know how many bytes have actually been written, i.e. without
 	 * a way to do the call again. Because of this great API design and
 	 * implementation on macOS, we'll just use write(2) here. */
-	int fd = fileno(__darwintrace_sock());
-	size_t count = 0;
+	int fd = -1;
+	bool retry = false;
+	size_t count;
+retry:
+	fd = fileno(__darwintrace_sock());
+	count = 0;
 	while (count < size) {
 		ssize_t res = write(fd, buf + count, size - count);
 		if (res < 0) {
 			if (errno == EINTR) {
 				continue;
 			}
+			if (errno == EBADF && !retry) {
+				__darwintrace_close();
+				__darwintrace_setup();
+				retry = true;
+				goto retry;
+			}
 			perror("darwintrace: write");
 			abort();
 		}