mirror of
https://git.FreeBSD.org/src.git
synced 2025-02-06 18:29:47 +00:00
8d333b3c85
- Pass O_NOCTTY to posix_openpt(2). This makes the implementation work consistently on implementations that make the PTY the controlling TTY by default. - Call unlockpt() before opening the slave device. POSIX mentions that de slave device should only be opened after grantpt() and unlockpt() have been called. - Replace some redundant code by a label. In theory we could remove a lot of code from openpty() on FreeBSD -CURRENT, because grantpt(), unlockpt() and revoke() are not needed in our implementation. We'd better keep them there. This makes the code still work with older FreeBSD releases and even makes it work on other non-BSD operating systems. I've compiled openpty() on Linux. You only need to remove the revoke() call, because revoke() on Linux always returns -1. Apart from that, it seems to work like it should. Reviewed by: jhb
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*-
|
|
* 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.
|
|
* 4. 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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)pty.c 8.3 (Berkeley) 5/16/94";
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <grp.h>
|
|
#include <libutil.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
|
|
int
|
|
openpty(int *amaster, int *aslave, char *name, struct termios *termp,
|
|
struct winsize *winp)
|
|
{
|
|
const char *slavename;
|
|
int master, slave;
|
|
|
|
master = posix_openpt(O_RDWR|O_NOCTTY);
|
|
if (master == -1)
|
|
return (-1);
|
|
|
|
if (grantpt(master) == -1)
|
|
goto bad;
|
|
|
|
if (unlockpt(master) == -1)
|
|
goto bad;
|
|
|
|
slavename = ptsname(master);
|
|
if (slavename == NULL)
|
|
goto bad;
|
|
|
|
if (revoke(slavename) == -1)
|
|
goto bad;
|
|
|
|
slave = open(slavename, O_RDWR);
|
|
if (slave == -1)
|
|
goto bad;
|
|
|
|
*amaster = master;
|
|
*aslave = slave;
|
|
|
|
if (name)
|
|
strcpy(name, slavename);
|
|
if (termp)
|
|
tcsetattr(slave, TCSAFLUSH, termp);
|
|
if (winp)
|
|
ioctl(slave, TIOCSWINSZ, (char *)winp);
|
|
|
|
return (0);
|
|
|
|
bad: close(master);
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
forkpty(int *amaster, char *name, struct termios *termp, struct winsize *winp)
|
|
{
|
|
int master, slave, pid;
|
|
|
|
if (openpty(&master, &slave, name, termp, 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);
|
|
}
|