3c3eb5801d
get a valid ttyslot for them. Instead if and entry is not found and we are a pty, allocate the n + 1 + minor(pty) slot.
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* $NetBSD: ttyslot.c,v 1.12 2004/11/11 00:01:38 christos Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)ttyslot.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: ttyslot.c,v 1.12 2004/11/11 00:01:38 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <ttyent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#ifdef __weak_alias
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__weak_alias(ttyslot,_ttyslot)
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#endif
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int
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ttyslot(void)
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{
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struct ttyent *ttyp;
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int slot = 0, ispty = 0;
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char *p;
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int cnt;
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char *name;
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struct ptmget ptm;
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setttyent();
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for (cnt = 0; cnt < 3; ++cnt) {
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if (ioctl(cnt, TIOCPTSNAME, &ptm) != -1) {
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ispty = 1;
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name = ptm.sn;
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} else if ((name = ttyname(cnt)) != NULL) {
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ispty = 0;
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} else
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continue;
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if ((p = strstr(name, "/pts/")) != NULL)
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++p;
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else if ((p = strrchr(name, '/')) != NULL)
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++p;
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else
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p = name;
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for (slot = 1; (ttyp = getttyent()) != NULL; ++slot)
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if (!strcmp(ttyp->ty_name, p)) {
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endttyent();
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return slot;
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}
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break;
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}
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endttyent();
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if (ispty) {
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struct stat st;
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if (fstat(cnt, &st) == -1)
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return 0;
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return slot + minor(st.st_rdev) + 1;
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}
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return 0;
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}
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