minix/lib/libutil/pty.c
Thomas Veerman a209c3ae12 Fix a ton of compiler warnings
This patch fixes most of current reasons to generate compiler warnings.
The changes consist of:
 - adding missing casts
 - hiding or unhiding function declarations
 - including headers where missing
 - add __UNCONST when assigning a const char * to a char *
 - adding missing return statements
 - changing some types from unsigned to signed, as the code seems to want
   signed ints
 - converting old-style function definitions to current style (i.e.,
   void func(param1, param2) short param1, param2; {...} to
   void func (short param1, short param2) {...})
 - making the compiler silent about signed vs unsigned comparisons. We
   have too many of those in the new libc to fix.

A number of bugs in the test set were fixed. These bugs were never
triggered with our old libc. Consequently, these tests are now forced to
link with the new libc or they will generate errors (in particular tests 43
and 55).

Most changes in NetBSD libc are limited to moving aroudn "#ifndef __minix"
or stuff related to Minix-specific things (code in sys-minix or gen/minix).
2011-11-14 10:07:49 +00:00

174 lines
4.6 KiB
C

/* $NetBSD: pty.c,v 1.31 2009/02/20 16:44:06 christos Exp $ */
/*-
* Copyright (c) 1990, 1993, 1994
* 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[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94";
#else
__RCSID("$NetBSD: pty.c,v 1.31 2009/02/20 16:44:06 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <util.h>
/*
* XXX: `v' removed until no ports are using console devices which use ttyv0
*/
#define TTY_LETTERS "pqrstuwxyzPQRST"
#define TTY_OLD_SUFFIX "0123456789abcdef"
#define TTY_NEW_SUFFIX "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
int
openpty(int *amaster, int *aslave, char *name, struct termios *term,
struct winsize *winp)
{
char line[] = "/dev/XtyXX";
const char *cp1, *cp2, *cp, *linep;
int master, slave;
gid_t ttygid;
mode_t mode;
struct group grs, *grp;
char grbuf[1024];
_DIAGASSERT(amaster != NULL);
_DIAGASSERT(aslave != NULL);
/* name may be NULL */
/* term may be NULL */
/* winp may be NULL */
#ifndef __minix
if ((master = open("/dev/ptm", O_RDWR)) != -1) {
struct ptmget pt;
if (ioctl(master, TIOCPTMGET, &pt) != -1) {
(void)close(master);
master = pt.cfd;
slave = pt.sfd;
linep = pt.sn;
goto gotit;
}
(void)close(master);
}
#endif
(void)getgrnam_r("tty", &grs, grbuf, sizeof(grbuf), &grp);
if (grp != NULL) {
ttygid = grp->gr_gid;
mode = S_IRUSR|S_IWUSR|S_IWGRP;
} else {
ttygid = getgid();
mode = S_IRUSR|S_IWUSR;
}
for (cp1 = TTY_LETTERS; *cp1; cp1++) {
line[8] = *cp1;
for (cp = cp2 = TTY_OLD_SUFFIX TTY_NEW_SUFFIX; *cp2; cp2++) {
line[5] = 'p';
line[9] = *cp2;
if ((master = open(line, O_RDWR, 0)) == -1) {
if (errno != ENOENT)
continue; /* busy */
if ((size_t)(cp2 - cp + 1) < sizeof(TTY_OLD_SUFFIX))
return -1; /* out of ptys */
else
break; /* out of ptys in this group */
}
line[5] = 't';
linep = line;
if (chown(line, getuid(), ttygid) == 0 &&
chmod(line, mode) == 0 &&
#ifndef __minix
revoke(line) == 0 &&
#endif
(slave = open(line, O_RDWR, 0)) != -1) {
#ifndef __minix
gotit:
#endif
*amaster = master;
*aslave = slave;
if (name)
(void)strcpy(name, linep);
if (term)
(void)tcsetattr(slave, TCSAFLUSH, term);
if (winp)
(void)ioctl(slave, TIOCSWINSZ, winp);
return 0;
}
(void)close(master);
}
}
errno = ENOENT; /* out of ptys */
return -1;
}
pid_t
forkpty(int *amaster, char *name, struct termios *term, struct winsize *winp)
{
int master, slave;
pid_t pid;
_DIAGASSERT(amaster != NULL);
/* name may be NULL */
/* term may be NULL */
/* winp may be NULL */
if (openpty(&master, &slave, name, term, winp) == -1)
return -1;
switch (pid = fork()) {
case -1:
return -1;
case 0:
/*
* child
*/
(void)close(master);
login_tty(slave);
return 0;
}
/*
* parent
*/
*amaster = master;
(void)close(slave);
return pid;
}