minix/lib/libc/gen/ttyslot.c

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/* $NetBSD: ttyslot.c,v 1.13 2009/01/11 02:46:27 christos Exp $ */
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)ttyslot.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: ttyslot.c,v 1.13 2009/01/11 02:46:27 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <ttyent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#ifdef __weak_alias
__weak_alias(ttyslot,_ttyslot)
#endif
int
ttyslot(void)
{
struct ttyent *ttyp;
int slot = 0, ispty = 0;
char *p;
int cnt;
char *name;
#if !defined(__minix)
struct ptmget ptm;
#endif /* !defined(__minix) */
setttyent();
for (cnt = 0; cnt < 3; ++cnt) {
#if !defined(__minix)
if (ioctl(cnt, TIOCPTSNAME, &ptm) != -1) {
ispty = 1;
name = ptm.sn;
} else if ((name = ttyname(cnt)) != NULL) {
#else
if ((name = ttyname(cnt)) != NULL) {
#endif /* !defined(__minix) */
ispty = 0;
} else
continue;
if ((p = strstr(name, "/pts/")) != NULL)
++p;
else if ((p = strrchr(name, '/')) != NULL)
++p;
else
p = name;
for (slot = 1; (ttyp = getttyent()) != NULL; ++slot)
if (!strcmp(ttyp->ty_name, p)) {
endttyent();
return slot;
}
break;
}
endttyent();
if (ispty) {
struct stat st;
if (fstat(cnt, &st) == -1)
return 0;
return slot + (int)minor(st.st_rdev) + 1;
}
return 0;
}