signal.c

linux下用PCMCIA无线网卡虚拟无线AP的程序源码

/* vi: set sw=4 ts=4: */
/*
 * signal testing function for uClibc
 *
 * Copyright (C) 2000 by Lineo, inc.  Written by Erik Andersen
 * <[e-mail]>, <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */


#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>
#include <signal.h>


/* -------------------------------------------------*/
/* This stuff is common to all the testing routines */
/* -------------------------------------------------*/
const char *it = "<UNSET>";		/* Routine name for message routines. */
size_t errors = 0;

void check(int thing, int number)
{
	if (!thing) {
		printf("%s: flunked test %d\n", it, number);
		++errors;
	}
}

void equal(const char *a, const char *b, int number)
{
	check(a != NULL && b != NULL && (strcmp(a, b) == 0), number);
}


/* -------------------------------------------------*/
/* Let the tests begin....                          */
/* -------------------------------------------------*/

int global_int = 0;

void set_global_int_to_one(int signum)
{
	printf ("Received signal %d (%s).\n", signum, strsignal(signum));
	global_int = 1;
	return;
}

void signal_test_1(void)
{
	global_int = 0;

	it = "global variable set from signal handler";
	signal(SIGUSR1, set_global_int_to_one);
	raise(SIGUSR1);

	/* This should already have jumped to the signal handler */
	check((global_int == 1), 1);

	global_int = 0;
	signal(SIGUSR1, SIG_IGN);
	raise(SIGUSR1);
	/* This should not go to the signal handler this time since we  */
	check((global_int == 0), 1);
}


int main(void)
{
	int status;

	signal_test_1();

	if (errors == 0) {
		status = EXIT_SUCCESS;
		printf("No errors.\n");
	} else {
		status = EXIT_FAILURE;
		printf("%d errors.\n", errors);
	}
	exit(status);
}