848 lines
23 KiB
C
848 lines
23 KiB
C
/* Low level interface to ptrace, for GDB when running under Unix.
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Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
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1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
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2009 Free Software Foundation, Inc.
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This file is part of GDB.
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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 3 of the License, or
|
||
(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
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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||
GNU General Public License for more details.
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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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "command.h"
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#include "serial.h"
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#include "terminal.h"
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#include "target.h"
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#include "gdbthread.h"
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#include "observer.h"
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#include "gdb_string.h"
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#include <signal.h>
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#include <fcntl.h>
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#include "gdb_select.h"
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#include "inflow.h"
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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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#ifndef O_NOCTTY
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#define O_NOCTTY 0
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#endif
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#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
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static void handle_sigio (int);
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#endif
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extern void _initialize_inflow (void);
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static void pass_signal (int);
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static void kill_command (char *, int);
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static void terminal_ours_1 (int);
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/* Record terminal status separately for debugger and inferior. */
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static struct serial *stdin_serial;
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/* Terminal related info we need to keep track of. Each inferior
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holds an instance of this structure --- we save it whenever the
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corresponding inferior stops, and restore it to the foreground
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inferior when it resumes. */
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struct terminal_info
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{
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/* The name of the tty (from the `tty' command) that we gave to the
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inferior when it was started. */
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char *run_terminal;
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/* TTY state. We save it whenever the inferior stops, and restore
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it when it resumes. */
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serial_ttystate ttystate;
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#ifdef PROCESS_GROUP_TYPE
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/* Process group. Saved and restored just like ttystate. */
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PROCESS_GROUP_TYPE process_group;
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#endif
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/* fcntl flags. Saved and restored just like ttystate. */
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int tflags;
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};
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/* Our own tty state, which we restore every time we need to deal with
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the terminal. This is only set once, when GDB first starts. The
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settings of flags which readline saves and restores and
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unimportant. */
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static struct terminal_info our_terminal_info;
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#ifdef PROCESS_GROUP_TYPE
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/* Return the process group of the current inferior. */
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PROCESS_GROUP_TYPE
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inferior_process_group (void)
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{
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return current_inferior ()->terminal_info->process_group;
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}
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#endif
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/* While the inferior is running, we want SIGINT and SIGQUIT to go to the
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inferior only. If we have job control, that takes care of it. If not,
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we save our handlers in these two variables and set SIGINT and SIGQUIT
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to SIG_IGN. */
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static void (*sigint_ours) ();
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static void (*sigquit_ours) ();
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/* The name of the tty (from the `tty' command) that we're giving to
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the inferior when starting it up. This is only (and should only
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be) used as a transient global by new_tty_prefork,
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create_tty_session, new_tty and new_tty_postfork, all called from
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fork_inferior, while forking a new child. */
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static const char *inferior_thisrun_terminal;
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/* Nonzero if our terminal settings are in effect. Zero if the
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inferior's settings are in effect. Ignored if !gdb_has_a_terminal
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(). */
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int terminal_is_ours;
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#ifdef PROCESS_GROUP_TYPE
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static PROCESS_GROUP_TYPE
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gdb_getpgrp (void)
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{
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int process_group = -1;
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#ifdef HAVE_TERMIOS
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process_group = tcgetpgrp (0);
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#endif
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#ifdef HAVE_TERMIO
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process_group = getpgrp ();
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#endif
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#ifdef HAVE_SGTTY
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ioctl (0, TIOCGPGRP, &process_group);
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#endif
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return process_group;
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}
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#endif
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enum
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{
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yes, no, have_not_checked
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}
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gdb_has_a_terminal_flag = have_not_checked;
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/* Does GDB have a terminal (on stdin)? */
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int
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gdb_has_a_terminal (void)
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{
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switch (gdb_has_a_terminal_flag)
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{
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case yes:
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return 1;
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case no:
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return 0;
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case have_not_checked:
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/* Get all the current tty settings (including whether we have a
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tty at all!). Can't do this in _initialize_inflow because
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serial_fdopen() won't work until the serial_ops_list is
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initialized. */
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#ifdef F_GETFL
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our_terminal_info.tflags = fcntl (0, F_GETFL, 0);
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#endif
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gdb_has_a_terminal_flag = no;
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if (stdin_serial != NULL)
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{
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our_terminal_info.ttystate = serial_get_tty_state (stdin_serial);
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if (our_terminal_info.ttystate != NULL)
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{
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gdb_has_a_terminal_flag = yes;
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#ifdef PROCESS_GROUP_TYPE
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our_terminal_info.process_group = gdb_getpgrp ();
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#endif
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}
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}
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return gdb_has_a_terminal_flag == yes;
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default:
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/* "Can't happen". */
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return 0;
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}
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}
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/* Macro for printing errors from ioctl operations */
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#define OOPSY(what) \
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if (result == -1) \
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fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \
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what, safe_strerror (errno))
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static void terminal_ours_1 (int);
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/* Initialize the terminal settings we record for the inferior,
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before we actually run the inferior. */
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void
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terminal_init_inferior_with_pgrp (int pgrp)
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{
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if (gdb_has_a_terminal ())
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{
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struct inferior *inf = current_inferior ();
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/* We could just as well copy our_ttystate (if we felt like
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adding a new function serial_copy_tty_state()). */
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xfree (inf->terminal_info->ttystate);
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inf->terminal_info->ttystate
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= serial_get_tty_state (stdin_serial);
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#ifdef PROCESS_GROUP_TYPE
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inf->terminal_info->process_group = pgrp;
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#endif
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/* Make sure that next time we call terminal_inferior (which will be
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before the program runs, as it needs to be), we install the new
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process group. */
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terminal_is_ours = 1;
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}
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}
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/* Save the terminal settings again. This is necessary for the TUI
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when it switches to TUI or non-TUI mode; curses changes the terminal
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and gdb must be able to restore it correctly. */
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void
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terminal_save_ours (void)
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{
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if (gdb_has_a_terminal ())
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{
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/* We could just as well copy our_ttystate (if we felt like adding
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a new function serial_copy_tty_state). */
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xfree (our_terminal_info.ttystate);
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our_terminal_info.ttystate = serial_get_tty_state (stdin_serial);
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}
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}
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void
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terminal_init_inferior (void)
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{
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#ifdef PROCESS_GROUP_TYPE
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/* This is for Lynx, and should be cleaned up by having Lynx be a separate
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debugging target with a version of target_terminal_init_inferior which
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passes in the process group to a generic routine which does all the work
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(and the non-threaded child_terminal_init_inferior can just pass in
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inferior_ptid to the same routine). */
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/* We assume INFERIOR_PID is also the child's process group. */
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terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid));
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#endif /* PROCESS_GROUP_TYPE */
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}
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/* Put the inferior's terminal settings into effect.
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This is preparation for starting or resuming the inferior. */
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void
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terminal_inferior (void)
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{
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struct inferior *inf;
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if (!terminal_is_ours)
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return;
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inf = current_inferior ();
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if (gdb_has_a_terminal ()
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&& inf->terminal_info->ttystate != NULL
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&& inf->terminal_info->run_terminal == NULL)
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{
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int result;
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#ifdef F_GETFL
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/* Is there a reason this is being done twice? It happens both
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places we use F_SETFL, so I'm inclined to think perhaps there
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is some reason, however perverse. Perhaps not though... */
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result = fcntl (0, F_SETFL, inf->terminal_info->tflags);
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result = fcntl (0, F_SETFL, inf->terminal_info->tflags);
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OOPSY ("fcntl F_SETFL");
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#endif
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/* Because we were careful to not change in or out of raw mode in
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terminal_ours, we will not change in our out of raw mode with
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this call, so we don't flush any input. */
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result = serial_set_tty_state (stdin_serial,
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inf->terminal_info->ttystate);
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OOPSY ("setting tty state");
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if (!job_control)
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{
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sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN);
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#ifdef SIGQUIT
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sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN);
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#endif
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}
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/* If attach_flag is set, we don't know whether we are sharing a
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terminal with the inferior or not. (attaching a process
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without a terminal is one case where we do not; attaching a
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process which we ran from the same shell as GDB via `&' is
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one case where we do, I think (but perhaps this is not
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`sharing' in the sense that we need to save and restore tty
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state)). I don't know if there is any way to tell whether we
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are sharing a terminal. So what we do is to go through all
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the saving and restoring of the tty state, but ignore errors
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setting the process group, which will happen if we are not
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sharing a terminal). */
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if (job_control)
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{
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#ifdef HAVE_TERMIOS
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result = tcsetpgrp (0, inf->terminal_info->process_group);
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if (!inf->attach_flag)
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OOPSY ("tcsetpgrp");
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#endif
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#ifdef HAVE_SGTTY
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result = ioctl (0, TIOCSPGRP, &inf->terminal_info->process_group);
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if (!inf->attach_flag)
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OOPSY ("TIOCSPGRP");
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#endif
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}
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}
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terminal_is_ours = 0;
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}
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/* Put some of our terminal settings into effect,
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enough to get proper results from our output,
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but do not change into or out of RAW mode
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so that no input is discarded.
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After doing this, either terminal_ours or terminal_inferior
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should be called to get back to a normal state of affairs. */
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void
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terminal_ours_for_output (void)
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{
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terminal_ours_1 (1);
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}
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/* Put our terminal settings into effect.
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First record the inferior's terminal settings
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so they can be restored properly later. */
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void
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terminal_ours (void)
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{
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terminal_ours_1 (0);
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}
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/* output_only is not used, and should not be used unless we introduce
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separate terminal_is_ours and terminal_is_ours_for_output
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flags. */
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static void
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terminal_ours_1 (int output_only)
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{
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struct inferior *inf;
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if (terminal_is_ours)
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return;
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terminal_is_ours = 1;
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/* Checking inferior->run_terminal is necessary so that
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if GDB is running in the background, it won't block trying
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to do the ioctl()'s below. Checking gdb_has_a_terminal
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avoids attempting all the ioctl's when running in batch. */
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inf = current_inferior ();
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if (inf->terminal_info->run_terminal != NULL || gdb_has_a_terminal () == 0)
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return;
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{
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#ifdef SIGTTOU
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/* Ignore this signal since it will happen when we try to set the
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pgrp. */
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void (*osigttou) () = NULL;
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#endif
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int result;
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||
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#ifdef SIGTTOU
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if (job_control)
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osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
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#endif
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xfree (inf->terminal_info->ttystate);
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inf->terminal_info->ttystate = serial_get_tty_state (stdin_serial);
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||
#ifdef PROCESS_GROUP_TYPE
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if (!inf->attach_flag)
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/* If setpgrp failed in terminal_inferior, this would give us
|
||
our process group instead of the inferior's. See
|
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terminal_inferior for details. */
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inf->terminal_info->process_group = gdb_getpgrp ();
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||
#endif
|
||
|
||
/* Here we used to set ICANON in our ttystate, but I believe this
|
||
was an artifact from before when we used readline. Readline sets
|
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the tty state when it needs to.
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FIXME-maybe: However, query() expects non-raw mode and doesn't
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use readline. Maybe query should use readline (on the other hand,
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||
this only matters for HAVE_SGTTY, not termio or termios, I think). */
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||
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/* Set tty state to our_ttystate. We don't change in our out of raw
|
||
mode, to avoid flushing input. We need to do the same thing
|
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regardless of output_only, because we don't have separate
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||
terminal_is_ours and terminal_is_ours_for_output flags. It's OK,
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though, since readline will deal with raw mode when/if it needs to.
|
||
*/
|
||
|
||
serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate,
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inf->terminal_info->ttystate);
|
||
|
||
if (job_control)
|
||
{
|
||
#ifdef HAVE_TERMIOS
|
||
result = tcsetpgrp (0, our_terminal_info.process_group);
|
||
#if 0
|
||
/* This fails on Ultrix with EINVAL if you run the testsuite
|
||
in the background with nohup, and then log out. GDB never
|
||
used to check for an error here, so perhaps there are other
|
||
such situations as well. */
|
||
if (result == -1)
|
||
fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n",
|
||
safe_strerror (errno));
|
||
#endif
|
||
#endif /* termios */
|
||
|
||
#ifdef HAVE_SGTTY
|
||
result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group);
|
||
#endif
|
||
}
|
||
|
||
#ifdef SIGTTOU
|
||
if (job_control)
|
||
signal (SIGTTOU, osigttou);
|
||
#endif
|
||
|
||
if (!job_control)
|
||
{
|
||
signal (SIGINT, sigint_ours);
|
||
#ifdef SIGQUIT
|
||
signal (SIGQUIT, sigquit_ours);
|
||
#endif
|
||
}
|
||
|
||
#ifdef F_GETFL
|
||
inf->terminal_info->tflags = fcntl (0, F_GETFL, 0);
|
||
|
||
/* Is there a reason this is being done twice? It happens both
|
||
places we use F_SETFL, so I'm inclined to think perhaps there
|
||
is some reason, however perverse. Perhaps not though... */
|
||
result = fcntl (0, F_SETFL, our_terminal_info.tflags);
|
||
result = fcntl (0, F_SETFL, our_terminal_info.tflags);
|
||
#endif
|
||
}
|
||
}
|
||
|
||
/* This is a "new_inferior" observer. It's business is to allocate
|
||
the TERMINAL_INFO member of the inferior structure. This field is
|
||
private to inflow.c, and its type is opaque to the rest of GDB.
|
||
PID is the target pid of the inferior that has just been added to
|
||
the inferior list. */
|
||
|
||
static void
|
||
inflow_new_inferior (int pid)
|
||
{
|
||
struct inferior *inf = find_inferior_pid (pid);
|
||
|
||
inf->terminal_info = XZALLOC (struct terminal_info);
|
||
}
|
||
|
||
/* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member
|
||
of the inferior structure. This field is private to inflow.c, and
|
||
its type is opaque to the rest of GDB. PID is the target pid of
|
||
the inferior that is about to be removed from the inferior
|
||
list. */
|
||
|
||
static void
|
||
inflow_inferior_exit (int pid)
|
||
{
|
||
struct inferior *inf = find_inferior_pid (pid);
|
||
|
||
xfree (inf->terminal_info->run_terminal);
|
||
xfree (inf->terminal_info);
|
||
inf->terminal_info = NULL;
|
||
}
|
||
|
||
void
|
||
copy_terminal_info (struct inferior *to, struct inferior *from)
|
||
{
|
||
*to->terminal_info = *from->terminal_info;
|
||
if (from->terminal_info->run_terminal)
|
||
to->terminal_info->run_terminal = from->terminal_info->run_terminal;
|
||
}
|
||
|
||
void
|
||
term_info (char *arg, int from_tty)
|
||
{
|
||
target_terminal_info (arg, from_tty);
|
||
}
|
||
|
||
void
|
||
child_terminal_info (char *args, int from_tty)
|
||
{
|
||
struct inferior *inf;
|
||
|
||
if (!gdb_has_a_terminal ())
|
||
{
|
||
printf_filtered (_("This GDB does not control a terminal.\n"));
|
||
return;
|
||
}
|
||
|
||
if (ptid_equal (inferior_ptid, null_ptid))
|
||
return;
|
||
|
||
inf = current_inferior ();
|
||
|
||
printf_filtered (_("Inferior's terminal status (currently saved by GDB):\n"));
|
||
|
||
/* First the fcntl flags. */
|
||
{
|
||
int flags;
|
||
|
||
flags = inf->terminal_info->tflags;
|
||
|
||
printf_filtered ("File descriptor flags = ");
|
||
|
||
#ifndef O_ACCMODE
|
||
#define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR)
|
||
#endif
|
||
/* (O_ACCMODE) parens are to avoid Ultrix header file bug */
|
||
switch (flags & (O_ACCMODE))
|
||
{
|
||
case O_RDONLY:
|
||
printf_filtered ("O_RDONLY");
|
||
break;
|
||
case O_WRONLY:
|
||
printf_filtered ("O_WRONLY");
|
||
break;
|
||
case O_RDWR:
|
||
printf_filtered ("O_RDWR");
|
||
break;
|
||
}
|
||
flags &= ~(O_ACCMODE);
|
||
|
||
#ifdef O_NONBLOCK
|
||
if (flags & O_NONBLOCK)
|
||
printf_filtered (" | O_NONBLOCK");
|
||
flags &= ~O_NONBLOCK;
|
||
#endif
|
||
|
||
#if defined (O_NDELAY)
|
||
/* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will
|
||
print it as O_NONBLOCK, which is good cause that is what POSIX
|
||
has, and the flag will already be cleared by the time we get here. */
|
||
if (flags & O_NDELAY)
|
||
printf_filtered (" | O_NDELAY");
|
||
flags &= ~O_NDELAY;
|
||
#endif
|
||
|
||
if (flags & O_APPEND)
|
||
printf_filtered (" | O_APPEND");
|
||
flags &= ~O_APPEND;
|
||
|
||
#if defined (O_BINARY)
|
||
if (flags & O_BINARY)
|
||
printf_filtered (" | O_BINARY");
|
||
flags &= ~O_BINARY;
|
||
#endif
|
||
|
||
if (flags)
|
||
printf_filtered (" | 0x%x", flags);
|
||
printf_filtered ("\n");
|
||
}
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
printf_filtered ("Process group = %d\n",
|
||
(int) inf->terminal_info->process_group);
|
||
#endif
|
||
|
||
serial_print_tty_state (stdin_serial,
|
||
inf->terminal_info->ttystate,
|
||
gdb_stdout);
|
||
}
|
||
|
||
/* NEW_TTY_PREFORK is called before forking a new child process,
|
||
so we can record the state of ttys in the child to be formed.
|
||
TTYNAME is null if we are to share the terminal with gdb;
|
||
or points to a string containing the name of the desired tty.
|
||
|
||
NEW_TTY is called in new child processes under Unix, which will
|
||
become debugger target processes. This actually switches to
|
||
the terminal specified in the NEW_TTY_PREFORK call. */
|
||
|
||
void
|
||
new_tty_prefork (const char *ttyname)
|
||
{
|
||
/* Save the name for later, for determining whether we and the child
|
||
are sharing a tty. */
|
||
inferior_thisrun_terminal = ttyname;
|
||
}
|
||
|
||
|
||
/* If RESULT, assumed to be the return value from a system call, is
|
||
negative, print the error message indicated by errno and exit.
|
||
MSG should identify the operation that failed. */
|
||
static void
|
||
check_syscall (const char *msg, int result)
|
||
{
|
||
if (result < 0)
|
||
{
|
||
print_sys_errmsg (msg, errno);
|
||
_exit (1);
|
||
}
|
||
}
|
||
|
||
void
|
||
new_tty (void)
|
||
{
|
||
int tty;
|
||
|
||
if (inferior_thisrun_terminal == 0)
|
||
return;
|
||
#if !defined(__GO32__) && !defined(_WIN32)
|
||
#ifdef TIOCNOTTY
|
||
/* Disconnect the child process from our controlling terminal. On some
|
||
systems (SVR4 for example), this may cause a SIGTTOU, so temporarily
|
||
ignore SIGTTOU. */
|
||
tty = open ("/dev/tty", O_RDWR);
|
||
if (tty > 0)
|
||
{
|
||
void (*osigttou) ();
|
||
|
||
osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
|
||
ioctl (tty, TIOCNOTTY, 0);
|
||
close (tty);
|
||
signal (SIGTTOU, osigttou);
|
||
}
|
||
#endif
|
||
|
||
/* Now open the specified new terminal. */
|
||
tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY);
|
||
check_syscall (inferior_thisrun_terminal, tty);
|
||
|
||
/* Avoid use of dup2; doesn't exist on all systems. */
|
||
if (tty != 0)
|
||
{
|
||
close (0);
|
||
check_syscall ("dup'ing tty into fd 0", dup (tty));
|
||
}
|
||
if (tty != 1)
|
||
{
|
||
close (1);
|
||
check_syscall ("dup'ing tty into fd 1", dup (tty));
|
||
}
|
||
if (tty != 2)
|
||
{
|
||
close (2);
|
||
check_syscall ("dup'ing tty into fd 2", dup (tty));
|
||
}
|
||
|
||
#ifdef TIOCSCTTY
|
||
/* Make tty our new controlling terminal. */
|
||
if (ioctl (tty, TIOCSCTTY, 0) == -1)
|
||
/* Mention GDB in warning because it will appear in the inferior's
|
||
terminal instead of GDB's. */
|
||
warning ("GDB: Failed to set controlling terminal: %s",
|
||
safe_strerror (errno));
|
||
#endif
|
||
|
||
if (tty > 2)
|
||
close (tty);
|
||
#endif /* !go32 && !win32 */
|
||
}
|
||
|
||
/* NEW_TTY_POSTFORK is called after forking a new child process, and
|
||
adding it to the inferior table, to store the TTYNAME being used by
|
||
the child, or null if it sharing the terminal with gdb. */
|
||
|
||
void
|
||
new_tty_postfork (void)
|
||
{
|
||
/* Save the name for later, for determining whether we and the child
|
||
are sharing a tty. */
|
||
|
||
if (inferior_thisrun_terminal)
|
||
current_inferior ()->terminal_info->run_terminal
|
||
= xstrdup (inferior_thisrun_terminal);
|
||
|
||
inferior_thisrun_terminal = NULL;
|
||
}
|
||
|
||
|
||
/* Call set_sigint_trap when you need to pass a signal on to an attached
|
||
process when handling SIGINT */
|
||
|
||
static void
|
||
pass_signal (int signo)
|
||
{
|
||
#ifndef _WIN32
|
||
kill (PIDGET (inferior_ptid), SIGINT);
|
||
#endif
|
||
}
|
||
|
||
static void (*osig) ();
|
||
static int osig_set;
|
||
|
||
void
|
||
set_sigint_trap (void)
|
||
{
|
||
struct inferior *inf = current_inferior ();
|
||
if (inf->attach_flag || inf->terminal_info->run_terminal)
|
||
{
|
||
osig = (void (*)()) signal (SIGINT, pass_signal);
|
||
osig_set = 1;
|
||
}
|
||
else
|
||
osig_set = 0;
|
||
}
|
||
|
||
void
|
||
clear_sigint_trap (void)
|
||
{
|
||
if (osig_set)
|
||
{
|
||
signal (SIGINT, osig);
|
||
osig_set = 0;
|
||
}
|
||
}
|
||
|
||
|
||
/* Create a new session if the inferior will run in a different tty.
|
||
A session is UNIX's way of grouping processes that share a controlling
|
||
terminal, so a new one is needed if the inferior terminal will be
|
||
different from GDB's.
|
||
|
||
Returns the session id of the new session, 0 if no session was created
|
||
or -1 if an error occurred. */
|
||
pid_t
|
||
create_tty_session (void)
|
||
{
|
||
#ifdef HAVE_SETSID
|
||
pid_t ret;
|
||
|
||
if (!job_control || inferior_thisrun_terminal == 0)
|
||
return 0;
|
||
|
||
ret = setsid ();
|
||
if (ret == -1)
|
||
warning ("Failed to create new terminal session: setsid: %s",
|
||
safe_strerror (errno));
|
||
|
||
return ret;
|
||
#else
|
||
return 0;
|
||
#endif /* HAVE_SETSID */
|
||
}
|
||
|
||
/* This is here because this is where we figure out whether we (probably)
|
||
have job control. Just using job_control only does part of it because
|
||
setpgid or setpgrp might not exist on a system without job control.
|
||
It might be considered misplaced (on the other hand, process groups and
|
||
job control are closely related to ttys).
|
||
|
||
For a more clean implementation, in libiberty, put a setpgid which merely
|
||
calls setpgrp and a setpgrp which does nothing (any system with job control
|
||
will have one or the other). */
|
||
int
|
||
gdb_setpgid (void)
|
||
{
|
||
int retval = 0;
|
||
|
||
if (job_control)
|
||
{
|
||
#if defined (HAVE_TERMIOS) || defined (TIOCGPGRP)
|
||
#ifdef HAVE_SETPGID
|
||
/* The call setpgid (0, 0) is supposed to work and mean the same
|
||
thing as this, but on Ultrix 4.2A it fails with EPERM (and
|
||
setpgid (getpid (), getpid ()) succeeds). */
|
||
retval = setpgid (getpid (), getpid ());
|
||
#else
|
||
#ifdef HAVE_SETPGRP
|
||
#ifdef SETPGRP_VOID
|
||
retval = setpgrp ();
|
||
#else
|
||
retval = setpgrp (getpid (), getpid ());
|
||
#endif
|
||
#endif /* HAVE_SETPGRP */
|
||
#endif /* HAVE_SETPGID */
|
||
#endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */
|
||
}
|
||
|
||
return retval;
|
||
}
|
||
|
||
/* Get all the current tty settings (including whether we have a
|
||
tty at all!). We can't do this in _initialize_inflow because
|
||
serial_fdopen() won't work until the serial_ops_list is
|
||
initialized, but we don't want to do it lazily either, so
|
||
that we can guarantee stdin_serial is opened if there is
|
||
a terminal. */
|
||
void
|
||
initialize_stdin_serial (void)
|
||
{
|
||
stdin_serial = serial_fdopen (0);
|
||
}
|
||
|
||
void
|
||
_initialize_inflow (void)
|
||
{
|
||
add_info ("terminal", term_info,
|
||
_("Print inferior's saved terminal status."));
|
||
|
||
terminal_is_ours = 1;
|
||
|
||
/* OK, figure out whether we have job control. If neither termios nor
|
||
sgtty (i.e. termio or go32), leave job_control 0. */
|
||
|
||
#if defined (HAVE_TERMIOS)
|
||
/* Do all systems with termios have the POSIX way of identifying job
|
||
control? I hope so. */
|
||
#ifdef _POSIX_JOB_CONTROL
|
||
job_control = 1;
|
||
#else
|
||
#ifdef _SC_JOB_CONTROL
|
||
job_control = sysconf (_SC_JOB_CONTROL);
|
||
#else
|
||
job_control = 0; /* have to assume the worst */
|
||
#endif /* _SC_JOB_CONTROL */
|
||
#endif /* _POSIX_JOB_CONTROL */
|
||
#endif /* HAVE_TERMIOS */
|
||
|
||
#ifdef HAVE_SGTTY
|
||
#ifdef TIOCGPGRP
|
||
job_control = 1;
|
||
#else
|
||
job_control = 0;
|
||
#endif /* TIOCGPGRP */
|
||
#endif /* sgtty */
|
||
|
||
observer_attach_new_inferior (inflow_new_inferior);
|
||
observer_attach_inferior_exit (inflow_inferior_exit);
|
||
}
|