firebird-mirror/src/remote/divorce.cpp

/*
 *	PROGRAM:	JRD Access Method
 *	MODULE:		divorce.c
 *	DESCRIPTION:	Divorce process from controlling terminal
 *
 * The contents of this file are subject to the Interbase Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy
 * of the License at http://www.Inprise.com/IPL.html
 *
 * Software distributed under the License is distributed on an
 * "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code was created by Inprise Corporation
 * and its predecessors. Portions created by Inprise Corporation are
 * Copyright (C) Inprise Corporation.
 *
 * All Rights Reserved.
 * Contributor(s): ______________________________________.
 *
 * 2002.10.29 Sean Leyne - Removed obsolete "Netware" port
 *
 */

#ifdef SUPERSERVER
#define FD_SETSIZE 256
#endif /* SUPERSERVER */

#include "firebird.h"
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/types.h>
#ifdef _AIX
#include <sys/select.h>
#endif
#include "../jrd/common.h"


#ifndef NBBY
#define	NBBY	8
#endif

#ifndef NFDBITS
#define NFDBITS		(sizeof(SLONG) * NBBY)
#define	FD_SET(n, p)	((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
#define	FD_CLR(n, p)	((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
#define	FD_ISSET(n, p)	((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
#define FD_ZERO(p)	bzero((SCHAR *)(p), sizeof(*(p)))
#endif


void divorce_terminal( fd_set * mask)
{
/**************************************
 *
 *	d i v o r c e _ t e r m i n a l
 *
 **************************************
 *
 * Functional description
 *	Clean up everything in preparation to become an independent
 *	process.  Close all files except for marked by the input mask.
 *
 **************************************/
	int s, fid;

/* Close all files other than those explicitly requested to stay open */

	for (fid = 0; fid < NOFILE; fid++)
		if (!(FD_ISSET(fid, mask)))
			close(fid);

#ifdef SIGTTOU
	/* ignore all the teminal related signal if define */
	signal(SIGTTOU, SIG_IGN);
	signal(SIGTTIN, SIG_IGN);
	signal(SIGTSTP, SIG_IGN);
#endif


/* Perform terminal divorce */

	fid = open("/dev/tty", 2);

	if (fid >= 0) {
#ifdef TIOCNOTTY
		ioctl(fid, TIOCNOTTY, 0);
#endif
		close(fid);
	}

/* Finally, get out of the process group */

#ifdef HAVE_SETPGRP
#ifdef SETPGRP_VOID
	(void)setpgrp();
#else
	(void)setpgrp(0, 0);
#endif /* SETPGRP_VOID */
#else
#ifdef HAVE_SETPGID
	(void)setpgid(0, 0);
#endif /* HAVE_SETPGID */
#endif /* HAVE_SETPGRP */
}