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Linux/tools/testing/vsock/timeout.c

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  1 /* Timeout API for single-threaded programs that use blocking
  2  * syscalls (read/write/send/recv/connect/accept).
  3  *
  4  * Copyright (C) 2017 Red Hat, Inc.
  5  *
  6  * Author: Stefan Hajnoczi <stefanha@redhat.com>
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License
 10  * as published by the Free Software Foundation; version 2
 11  * of the License.
 12  */
 13 
 14 /* Use the following pattern:
 15  *
 16  *   timeout_begin(TIMEOUT);
 17  *   do {
 18  *       ret = accept(...);
 19  *       timeout_check("accept");
 20  *   } while (ret < 0 && ret == EINTR);
 21  *   timeout_end();
 22  */
 23 
 24 #include <stdlib.h>
 25 #include <stdbool.h>
 26 #include <unistd.h>
 27 #include <stdio.h>
 28 #include "timeout.h"
 29 
 30 static volatile bool timeout;
 31 
 32 /* SIGALRM handler function.  Do not use sleep(2), alarm(2), or
 33  * setitimer(2) while using this API - they may interfere with each
 34  * other.
 35  */
 36 void sigalrm(int signo)
 37 {
 38         timeout = true;
 39 }
 40 
 41 /* Start a timeout.  Call timeout_check() to verify that the timeout hasn't
 42  * expired.  timeout_end() must be called to stop the timeout.  Timeouts cannot
 43  * be nested.
 44  */
 45 void timeout_begin(unsigned int seconds)
 46 {
 47         alarm(seconds);
 48 }
 49 
 50 /* Exit with an error message if the timeout has expired */
 51 void timeout_check(const char *operation)
 52 {
 53         if (timeout) {
 54                 fprintf(stderr, "%s timed out\n", operation);
 55                 exit(EXIT_FAILURE);
 56         }
 57 }
 58 
 59 /* Stop a timeout */
 60 void timeout_end(void)
 61 {
 62         alarm(0);
 63         timeout = false;
 64 }
 65 

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