152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
/* $NetBSD: pty.c,v 1.21 2003/10/25 07:31:12 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
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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[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94";
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#else
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__RCSID("$NetBSD: pty.c,v 1.21 2003/10/25 07:31:12 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <stdio.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include <util.h>
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/*
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* XXX: `v' removed until no ports are using console devices which use ttyv0
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*/
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#define TTY_LETTERS "pqrstuwxyzPQRST"
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#define TTY_OLD_SUFFIX "0123456789abcdef"
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#define TTY_NEW_SUFFIX "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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int
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openpty(int *amaster, int *aslave, char *name, struct termios *termp,
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struct winsize *winp)
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{
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static char line[] = "/dev/XtyXX";
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const char *cp1, *cp2, *cp;
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int master, slave;
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gid_t ttygid;
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struct group *gr;
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_DIAGASSERT(amaster != NULL);
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_DIAGASSERT(aslave != NULL);
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/* name may be NULL */
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/* termp may be NULL */
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/* winp may be NULL */
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if ((gr = getgrnam("tty")) != NULL)
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ttygid = gr->gr_gid;
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else
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ttygid = (gid_t) -1;
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for (cp1 = TTY_LETTERS; *cp1; cp1++) {
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line[8] = *cp1;
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for (cp = cp2 = TTY_OLD_SUFFIX TTY_NEW_SUFFIX; *cp2; cp2++) {
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line[5] = 'p';
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line[9] = *cp2;
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if ((master = open(line, O_RDWR, 0)) == -1) {
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if (errno == ENOENT) {
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if (cp2 - cp + 1 < sizeof(TTY_OLD_SUFFIX))
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return (-1); /* out of ptys */
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else
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break;
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}
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} else {
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line[5] = 't';
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(void) chown(line, getuid(), ttygid);
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(void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
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(void) revoke(line);
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if ((slave = open(line, O_RDWR, 0)) != -1) {
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*amaster = master;
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*aslave = slave;
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if (name)
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strcpy(name, line);
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if (termp)
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(void) tcsetattr(slave,
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TCSAFLUSH, termp);
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if (winp)
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(void) ioctl(slave, TIOCSWINSZ,
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winp);
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return (0);
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}
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(void) close(master);
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}
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}
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}
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errno = ENOENT; /* out of ptys */
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return (-1);
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}
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pid_t
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forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
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{
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int master, slave;
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pid_t pid;
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_DIAGASSERT(amaster != NULL);
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/* name may be NULL */
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/* termp may be NULL */
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/* winp may be NULL */
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if (openpty(&master, &slave, name, termp, winp) == -1)
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return (-1);
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switch (pid = fork()) {
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case -1:
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return (-1);
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case 0:
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/*
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* child
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*/
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(void) close(master);
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login_tty(slave);
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return (0);
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}
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/*
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* parent
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*/
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*amaster = master;
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(void) close(slave);
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return (pid);
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}
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