sighandler.c

一个C语言写的快速贝叶斯垃圾邮件过滤工具

/* $Id: sighandler.c,v 1.7 2006/07/03 00:21:29 relson Exp $ */

/*****************************************************************************

NAME:
   sighandler.c -- signal handler

AUTHOR:
   David Relson <[e-mail]>

******************************************************************************/

#include "common.h"

#include <signal.h>
#include <stdlib.h>
#include <errno.h>

#include "sighandler.h"
#include "wordlists.h"

/* Global Definitions */

bool fDie = false;

/* Function Definitions */

static void mysignal(int sig, void (*hdl)(int)) {
#ifdef	SA_RESTART
    struct sigaction sa;

    memset( &sa, 0, sizeof(sa));
    sa.sa_handler = hdl;
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_RESTART;
    if (sigaction(sig, &sa, NULL)) {
	fprintf(stderr, "Cannot set signal %d handler to %p: %s\n",
		sig, hdl, strerror(errno));
	exit(EX_ERROR);
    }
#endif
}

static void mysigdie(int sig)
{
    (void) sig;		/* quiet compiler warning */

    if (!fDie)
	fDie = true;
    else
	exit(EX_ERROR);
}

void signal_setup(void)
{
    mysignal(SIGINT,  mysigdie);	/*  2 */
    mysignal(SIGPIPE, SIG_IGN);		/*  1 */
    mysignal(SIGTERM, mysigdie);	/* 15 */
}