Address code review feedback: close pipes, check waitpid, fix memory leak

Co-authored-by: probonopd <[email protected]>

Author: Copilot

src/runtime/runtime.c

@@ -1854,19 +1854,32 @@ int main(int argc, char* argv[]) {
         }
 
         if (apprun_pid == 0) {
-            /* Child process - exec AppRun */
+            /* Child process - close keepalive pipe before exec */
+            close(keepalive_pipe[0]);
+            close(keepalive_pipe[1]);
+            
+            /* exec AppRun */
             execv(filename, real_argv);
             /* Error if we continue here */
             perror("execv error");
             exit(EXIT_EXECERROR);
         } else {
             /* Parent process - wait for AppRun to finish, then close pipe */
             int status;
-            waitpid(apprun_pid, &status, 0);
+            pid_t waited_pid = waitpid(apprun_pid, &status, 0);
+            if (waited_pid == -1) {
+                perror("waitpid error");
+                close(keepalive_pipe[0]);
+                free(real_argv);
+                exit(EXIT_EXECERROR);
+            }
 
             /* Close the keepalive pipe after AppRun exits to terminate FUSE daemon */
             close(keepalive_pipe[0]);
 
+            /* Free allocated memory before exit */
+            free(real_argv);
+            
             /* Exit with the same status as AppRun */
             if (WIFEXITED(status)) {
                 exit(WEXITSTATUS(status));