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/*--------------------------------*-C-*---------------------------------* |
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* File: ptytty.c |
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*----------------------------------------------------------------------* |
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* |
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* All portions of code are copyright by their respective author/s. |
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* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*---------------------------------------------------------------------*/ |
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|
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#include "../config.h" /* NECESSARY */ |
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|
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/* |
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* Try to be self-contained except for the above autoconfig'd defines |
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*/ |
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|
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#if 0 |
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#ifdef HAVE_GETPT |
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# define _GNU_SOURCE |
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#endif |
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#endif |
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|
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#include <cstdio> |
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#ifdef HAVE_STDLIB_H |
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# include <cstdlib> |
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#endif |
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#ifdef HAVE_SYS_TYPES_H |
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# include <sys/types.h> |
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#endif |
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#ifdef HAVE_UNISTD_H |
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# include <unistd.h> |
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#endif |
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#if defined(HAVE_STRING_H) |
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# include <cstring> |
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#endif |
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#ifdef HAVE_FCNTL_H |
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# include <fcntl.h> |
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#endif |
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#ifdef HAVE_SYS_IOCTL_H |
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# include <sys/ioctl.h> |
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#endif |
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#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) |
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# include <sys/stropts.h> /* for I_PUSH */ |
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#endif |
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|
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#ifdef DEBUG_TTY |
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# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr) |
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#else |
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# define D_TTY(x) |
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#endif |
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|
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/* ------------------------------------------------------------------------- * |
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* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
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* ------------------------------------------------------------------------- */ |
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/* |
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* Returns pty file descriptor, or -1 on failure |
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* If successful, ttydev is set to the name of the slave device. |
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* fd_tty _may_ also be set to an open fd to the slave device |
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*/ |
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/* EXTPROTO */ |
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int |
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rxvt_get_pty (int *fd_tty, const char **ttydev) |
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{ |
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int pfd; |
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|
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#ifdef PTYS_ARE_OPENPTY |
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|
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char tty_name[sizeof "/dev/pts/????\0"]; |
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|
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if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) |
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{ |
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*ttydev = strdup (tty_name); |
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return pfd; |
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} |
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#endif |
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|
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#ifdef PTYS_ARE__GETPTY |
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*ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
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if (*ttydev != NULL) |
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return pfd; |
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#endif |
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|
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#ifdef PTYS_ARE_GETPTY |
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|
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char *ptydev; |
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|
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while ((ptydev = getpty ()) != NULL) |
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if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0) |
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{ |
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*ttydev = ptydev; |
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return pfd; |
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} |
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#endif |
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|
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#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
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# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) |
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|
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{ |
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# ifdef PTYS_ARE_GETPT |
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pfd = getpt (); |
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# else |
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|
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pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
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# endif |
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|
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if (pfd >= 0) |
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{ |
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if (grantpt (pfd) == 0 /* change slave permissions */ |
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&& unlockpt (pfd) == 0) |
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{ /* slave now unlocked */ |
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*ttydev = ptsname (pfd); /* get slave's name */ |
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return pfd; |
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} |
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close (pfd); |
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} |
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} |
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# endif |
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#endif |
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|
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#ifdef PTYS_ARE_PTC |
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if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
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{ |
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*ttydev = ttyname (pfd); |
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return pfd; |
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} |
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#endif |
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|
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#ifdef PTYS_ARE_CLONE |
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if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
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{ |
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*ttydev = ptsname (pfd); |
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return pfd; |
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} |
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#endif |
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|
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#ifdef PTYS_ARE_NUMERIC |
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{ |
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int idx; |
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char *c1, *c2; |
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char pty_name[] = "/dev/ptyp???"; |
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char tty_name[] = "/dev/ttyp???"; |
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|
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c1 = & (pty_name[sizeof (pty_name) - 4]); |
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c2 = & (tty_name[sizeof (tty_name) - 4]); |
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for (idx = 0; idx < 256; idx++) |
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{ |
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sprintf (c1, "%d", idx); |
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sprintf (c2, "%d", idx); |
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if (access (tty_name, F_OK) < 0) |
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{ |
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idx = 256; |
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break; |
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} |
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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{ |
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if (access (tty_name, R_OK | W_OK) == 0) |
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{ |
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*ttydev = strdup (tty_name); |
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return pfd; |
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} |
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close (pfd); |
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} |
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} |
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} |
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#endif |
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#ifdef PTYS_ARE_SEARCHED |
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{ |
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const char *c1, *c2; |
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char pty_name[] = "/dev/pty??"; |
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char tty_name[] = "/dev/tty??"; |
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|
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# ifndef PTYCHAR1 |
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# define PTYCHAR1 "pqrstuvwxyz" |
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# endif |
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# ifndef PTYCHAR2 |
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# define PTYCHAR2 "0123456789abcdef" |
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# endif |
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|
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for (c1 = PTYCHAR1; *c1; c1++) |
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{ |
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pty_name[ (sizeof (pty_name) - 3)] = |
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tty_name[ (sizeof (pty_name) - 3)] = *c1; |
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for (c2 = PTYCHAR2; *c2; c2++) |
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{ |
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pty_name[ (sizeof (pty_name) - 2)] = |
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tty_name[ (sizeof (pty_name) - 2)] = *c2; |
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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{ |
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if (access (tty_name, R_OK | W_OK) == 0) |
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{ |
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*ttydev = strdup (tty_name); |
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return pfd; |
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} |
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close (pfd); |
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} |
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} |
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} |
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} |
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#endif |
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return -1; |
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} |
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|
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/*----------------------------------------------------------------------*/ |
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/* |
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* Returns tty file descriptor, or -1 on failure |
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*/ |
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/* EXTPROTO */ |
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int |
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rxvt_get_tty (const char *ttydev) |
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{ |
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return open (ttydev, O_RDWR | O_NOCTTY, 0); |
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} |
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|
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/*----------------------------------------------------------------------*/ |
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/* |
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* Make our tty a controlling tty so that /dev/tty points to us |
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*/ |
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/* EXTPROTO */ |
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int |
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rxvt_control_tty (int fd_tty, const char *ttydev) |
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{ |
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#ifndef __QNX__ |
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int fd; |
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|
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D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev)); |
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/* ---------------------------------------- */ |
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# ifdef HAVE_SETSID |
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setsid (); |
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# endif |
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# if defined(HAVE_SETPGID) |
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setpgid (0, 0); |
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# elif defined(HAVE_SETPGRP) |
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setpgrp (0, 0); |
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# endif |
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/* ---------------------------------------- */ |
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# ifdef TIOCNOTTY |
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|
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fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
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D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes")); |
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if (fd >= 0) |
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{ |
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ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */ |
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close (fd); |
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} |
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# endif |
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/* ---------------------------------------- */ |
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fd = open ("/dev/tty", O_RDWR | O_NOCTTY); |
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D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)")); |
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if (fd >= 0) |
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close (fd); /* ouch: still have controlling tty */ |
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/* ---------------------------------------- */ |
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#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
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/* |
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* Push STREAMS modules: |
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* ptem: pseudo-terminal hardware emulation module. |
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* ldterm: standard terminal line discipline. |
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* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
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* |
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* After we push the STREAMS modules, the first open () on the slave side |
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* (i.e. the next section between the dashes giving us "tty opened OK") |
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* should make the "ptem" (or "ldterm" depending upon either which OS |
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* version or which set of manual pages you have) module give us a |
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* controlling terminal. We must already have close ()d the master side |
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* fd in this child process before we push STREAMS modules on because the |
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* documentation is really unclear about whether it is any close () on |
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* the master side or the last close () - i.e. a proper STREAMS dismantling |
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* close () - on the master side which causes a hang up to be sent |
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* through - Geoff Wing |
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*/ |
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# ifdef HAVE_ISASTREAM |
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if (isastream (fd_tty) == 1) |
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# endif |
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{ |
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D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules")); |
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ioctl (fd_tty, I_PUSH, "ptem"); |
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ioctl (fd_tty, I_PUSH, "ldterm"); |
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ioctl (fd_tty, I_PUSH, "ttcompat"); |
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} |
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#endif |
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/* ---------------------------------------- */ |
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# if defined(TIOCSCTTY) |
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fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
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D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd)); |
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# elif defined(TIOCSETCTTY) |
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fd = ioctl (fd_tty, TIOCSETCTTY, NULL); |
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D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd)); |
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# else |
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fd = open (ttydev, O_RDWR); |
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D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK")); |
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if (fd >= 0) |
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close (fd); |
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# endif |
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/* ---------------------------------------- */ |
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fd = open ("/dev/tty", O_WRONLY); |
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D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)")); |
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if (fd < 0) |
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return -1; /* fatal */ |
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close (fd); |
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/* ---------------------------------------- */ |
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D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ())); |
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/* ---------------------------------------- */ |
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#endif /* ! __QNX__ */ |
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|
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return 0; |
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} |
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/*----------------------- end-of-file (C source) -----------------------*/ |
