Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /* Timeout API for single-threaded programs that use blocking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * syscalls (read/write/send/recv/connect/accept).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2017 Red Hat, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Author: Stefan Hajnoczi <stefanha@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) /* Use the following pattern:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *   timeout_begin(TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *   do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *       ret = accept(...);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *       timeout_check("accept");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *   } while (ret < 0 && ret == EINTR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *   timeout_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <stdbool.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "timeout.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static volatile bool timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* SIGALRM handler function.  Do not use sleep(2), alarm(2), or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * setitimer(2) while using this API - they may interfere with each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  * other.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) void sigalrm(int signo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	timeout = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* Start a timeout.  Call timeout_check() to verify that the timeout hasn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  * expired.  timeout_end() must be called to stop the timeout.  Timeouts cannot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  * be nested.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) void timeout_begin(unsigned int seconds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	alarm(seconds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /* Exit with an error message if the timeout has expired */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) void timeout_check(const char *operation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (timeout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		fprintf(stderr, "%s timed out\n", operation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		exit(EXIT_FAILURE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* Stop a timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) void timeout_end(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	alarm(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	timeout = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }