Correctly exit when another window manager is already running
This is implemented by checking if setting the redirect mask returned an error or not.
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500127705e
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@ -377,7 +377,9 @@ int main(int argc, char *argv[], char *env[]) {
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XCB_EVENT_MASK_POINTER_MOTION |
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XCB_EVENT_MASK_PROPERTY_CHANGE |
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XCB_EVENT_MASK_ENTER_WINDOW };
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xcb_change_window_attributes(conn, root, mask, values);
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xcb_void_cookie_t cookie;
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cookie = xcb_change_window_attributes_checked(conn, root, mask, values);
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check_error(conn, cookie, "Another window manager seems to be running");
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/* Setup NetWM atoms */
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#define GET_ATOM(name) { \
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@ -144,7 +144,7 @@ void start_application(const char *command) {
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void check_error(xcb_connection_t *conn, xcb_void_cookie_t cookie, char *err_message) {
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xcb_generic_error_t *error = xcb_request_check(conn, cookie);
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if (error != NULL) {
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fprintf(stderr, "ERROR: %s : %d\n", err_message , error->error_code);
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fprintf(stderr, "ERROR: %s (X error %d)\n", err_message , error->error_code);
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xcb_disconnect(conn);
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exit(-1);
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}
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