kdesu_pty.cpp
/* vi: ts=8 sts=4 sw=4
*
* $Id$
*
* This file is part of the KDE project, module kdesu.
* Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
*
* This file contains code from TEShell.C of the KDE konsole.
* Copyright (c) 1997,1998 by Lars Doelle <lars.doelle@on-line.de>
*
* This is free software; you can use this library under the GNU Library
* General Public License, version 2. See the file "COPYING.LIB" for the
* exact licensing terms.
*
* pty.cpp: Access to PTY's on different systems a la UNIX98.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* Needed for getpt, ptsname in glibc 2.1.x systems */
#endif
#include <config.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#if defined(__osf__) || defined(__CYGWIN__)
#include <pty.h>
#endif
#include <qglobal.h>
#include <qcstring.h>
#include <kdebug.h>
#include <kstandarddirs.h>
#include "kdesu_pty.h"
// stdlib.h is meant to declare the prototypes but doesn't :(
#ifndef __THROW
#define __THROW
#endif
#ifdef HAVE_GRANTPT
extern "C" int grantpt(int fd) __THROW;
#endif
#ifdef HAVE_PTSNAME
extern "C" char * ptsname(int fd) __THROW;
#endif
#ifdef HAVE_UNLOCKPT
extern "C" int unlockpt(int fd) __THROW;
#endif
#ifdef HAVE__GETPTY
extern "C" char *_getpty(int *, int, mode_t, int);
#endif
#ifdef HAVE_PTY_H
#include <pty.h>
#endif
#include <termios.h>
#ifdef HAVE_LIBUTIL_H
#include <libutil.h>
#elif defined(HAVE_UTIL_H)
#include <util.h>
#endif
PTY::PTY()
{
ptyfd = -1;
}
PTY::~PTY()
{
if (ptyfd >= 0)
close(ptyfd);
}
// Opens a pty master and returns its filedescriptor.
int PTY::getpt()
{
#if defined(HAVE_GETPT) && defined(HAVE_PTSNAME)
// 1: UNIX98: preferred way
ptyfd = ::getpt();
ttyname = ::ptsname(ptyfd);
return ptyfd;
#elif defined(HAVE_OPENPTY)
// 2: BSD interface
// More preferred than the linux hacks
char name[30];
int master_fd, slave_fd;
if (openpty(&master_fd, &slave_fd, name, 0L, 0L) != -1) {
ttyname = name;
name[5]='p';
ptyname = name;
close(slave_fd); // We don't need this yet // Yes, we do.
ptyfd = master_fd;
return ptyfd;
}
ptyfd = -1;
kdDebug(900) << k_lineinfo << "Opening pty failed.\n";
return -1;
#elif defined(HAVE__GETPTY)
// 3: Irix interface
int master_fd;
ttyname = _getpty(&master_fd,O_RDWR,0600,0);
if (ttyname)
ptyfd = master_fd;
else{
ptyfd = -1;
kdDebug(900) << k_lineinfo << "Opening pty failed.error" << errno << '\n';
}
return ptyfd;
#else
// 4: Open terminal device directly
// 4.1: Try /dev/ptmx first. (Linux w/ Unix98 PTYs, Solaris)
ptyfd = open("/dev/ptmx", O_RDWR);
if (ptyfd >= 0) {
ptyname = "/dev/ptmx";
#ifdef HAVE_PTSNAME
ttyname = ::ptsname(ptyfd);
return ptyfd;
#elif defined (TIOCGPTN)
int ptyno;
if (ioctl(ptyfd, TIOCGPTN, &ptyno) == 0) {
ttyname.sprintf("/dev/pts/%d", ptyno);
return ptyfd;
}
#endif
close(ptyfd);
}
// 4.2: Try /dev/pty[p-e][0-f] (Linux w/o UNIX98 PTY's)
for (const char *c1 = "pqrstuvwxyzabcde"; *c1 != '\0'; c1++)
{
for (const char *c2 = "0123456789abcdef"; *c2 != '\0'; c2++)
{
ptyname.sprintf("/dev/pty%c%c", *c1, *c2);
ttyname.sprintf("/dev/tty%c%c", *c1, *c2);
if (access(ptyname, F_OK) < 0)
goto linux_out;
ptyfd = open(ptyname, O_RDWR);
if (ptyfd >= 0)
return ptyfd;
}
}
linux_out:
// 4.3: Try /dev/pty%d (SCO, Unixware)
for (int i=0; i<256; i++)
{
ptyname.sprintf("/dev/ptyp%d", i);
ttyname.sprintf("/dev/ttyp%d", i);
if (access(ptyname, F_OK) < 0)
break;
ptyfd = open(ptyname, O_RDWR);
if (ptyfd >= 0)
return ptyfd;
}
// Other systems ??
ptyfd = -1;
kdDebug(900) << k_lineinfo << "Unknown system or all methods failed.\n";
return -1;
#endif // HAVE_GETPT && HAVE_PTSNAME
}
int PTY::grantpt()
{
if (ptyfd < 0)
return -1;
#ifdef HAVE_GRANTPT
return ::grantpt(ptyfd);
#elif defined(HAVE_OPENPTY)
// the BSD openpty() interface chowns the devices properly for us,
// no need to do this at all
return 0;
#else
// konsole_grantpty only does /dev/pty??
if (ptyname.left(8) != "/dev/pty")
return 0;
// Use konsole_grantpty:
if (KStandardDirs::findExe("konsole_grantpty").isEmpty())
{
kdError(900) << k_lineinfo << "konsole_grantpty not found.\n";
return -1;
}
// As defined in konsole_grantpty.c
const int pty_fileno = 3;
pid_t pid;
if ((pid = fork()) == -1)
{
kdError(900) << k_lineinfo << "fork(): " << perror << "\n";
return -1;
}
if (pid)
{
// Parent: wait for child
int ret;
waitpid(pid, &ret, 0);
if (WIFEXITED(ret) && !WEXITSTATUS(ret))
return 0;
kdError(900) << k_lineinfo << "konsole_grantpty returned with error: "
<< WEXITSTATUS(ret) << "\n";
return -1;
} else
{
// Child: exec konsole_grantpty
if (ptyfd != pty_fileno && dup2(ptyfd, pty_fileno) < 0)
_exit(1);
execlp("konsole_grantpty", "konsole_grantpty", "--grant", (void *)0);
kdError(900) << k_lineinfo << "exec(): " << perror << "\n";
_exit(1);
}
// shut up, gcc
return 0;
#endif // HAVE_GRANTPT
}
int PTY::unlockpt()
{
if (ptyfd < 0)
return -1;
#ifdef HAVE_UNLOCKPT
// (Linux w/ glibc 2.1, Solaris, ...)
return ::unlockpt(ptyfd);
#elif defined(TIOCSPTLCK)
// Unlock pty (Linux w/ UNIX98 PTY's & glibc 2.0)
int flag = 0;
return ioctl(ptyfd, TIOCSPTLCK, &flag);
#else
// Other systems (Linux w/o UNIX98 PTY's, ...)
return 0;
#endif
}
QCString PTY::ptsname()
{
if (ptyfd < 0)
return 0;
return ttyname;
}
PTY::PTY
PTY()
Construct a PTY object.
Definition: kdesu_pty.cpp:80
PTY::grantpt
int grantpt()
Grant access to the slave side.
Definition: kdesu_pty.cpp:195
PTY::getpt
int getpt()
Allocate a pty.
Definition: kdesu_pty.cpp:94
PTY::~PTY
~PTY()
Destructs the object.
Definition: kdesu_pty.cpp:85
PTY::ptsname
QCString ptsname()
Get the slave name.
Definition: kdesu_pty.cpp:295
PTY::unlockpt
int unlockpt()
Unlock the slave side.
Definition: kdesu_pty.cpp:264

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