mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
b886d83c5b
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation version 2 of the license extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 315 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Timeout API for single-threaded programs that use blocking
|
|
* syscalls (read/write/send/recv/connect/accept).
|
|
*
|
|
* Copyright (C) 2017 Red Hat, Inc.
|
|
*
|
|
* Author: Stefan Hajnoczi <stefanha@redhat.com>
|
|
*/
|
|
|
|
/* Use the following pattern:
|
|
*
|
|
* timeout_begin(TIMEOUT);
|
|
* do {
|
|
* ret = accept(...);
|
|
* timeout_check("accept");
|
|
* } while (ret < 0 && ret == EINTR);
|
|
* timeout_end();
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdbool.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include "timeout.h"
|
|
|
|
static volatile bool timeout;
|
|
|
|
/* SIGALRM handler function. Do not use sleep(2), alarm(2), or
|
|
* setitimer(2) while using this API - they may interfere with each
|
|
* other.
|
|
*/
|
|
void sigalrm(int signo)
|
|
{
|
|
timeout = true;
|
|
}
|
|
|
|
/* Start a timeout. Call timeout_check() to verify that the timeout hasn't
|
|
* expired. timeout_end() must be called to stop the timeout. Timeouts cannot
|
|
* be nested.
|
|
*/
|
|
void timeout_begin(unsigned int seconds)
|
|
{
|
|
alarm(seconds);
|
|
}
|
|
|
|
/* Exit with an error message if the timeout has expired */
|
|
void timeout_check(const char *operation)
|
|
{
|
|
if (timeout) {
|
|
fprintf(stderr, "%s timed out\n", operation);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
/* Stop a timeout */
|
|
void timeout_end(void)
|
|
{
|
|
alarm(0);
|
|
timeout = false;
|
|
}
|