5fd62852f6
(_initialize_inflow): Don't add the "kill" command or clear inferior_ptid here. * infcmd.c (kill_command): Moved here from inflow.c. (_initialize_infcmd): Add the "kill" command here.
848 lines
23 KiB
C
848 lines
23 KiB
C
/* Low level interface to ptrace, for GDB when running under Unix.
|
||
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
|
||
1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
|
||
2009 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "frame.h"
|
||
#include "inferior.h"
|
||
#include "command.h"
|
||
#include "serial.h"
|
||
#include "terminal.h"
|
||
#include "target.h"
|
||
#include "gdbthread.h"
|
||
#include "observer.h"
|
||
|
||
#include "gdb_string.h"
|
||
#include <signal.h>
|
||
#include <fcntl.h>
|
||
#include "gdb_select.h"
|
||
|
||
#include "inflow.h"
|
||
|
||
#ifdef HAVE_SYS_IOCTL_H
|
||
#include <sys/ioctl.h>
|
||
#endif
|
||
|
||
#ifndef O_NOCTTY
|
||
#define O_NOCTTY 0
|
||
#endif
|
||
|
||
#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
|
||
static void handle_sigio (int);
|
||
#endif
|
||
|
||
extern void _initialize_inflow (void);
|
||
|
||
static void pass_signal (int);
|
||
|
||
static void kill_command (char *, int);
|
||
|
||
static void terminal_ours_1 (int);
|
||
|
||
/* Record terminal status separately for debugger and inferior. */
|
||
|
||
static struct serial *stdin_serial;
|
||
|
||
/* Terminal related info we need to keep track of. Each inferior
|
||
holds an instance of this structure --- we save it whenever the
|
||
corresponding inferior stops, and restore it to the foreground
|
||
inferior when it resumes. */
|
||
struct terminal_info
|
||
{
|
||
/* The name of the tty (from the `tty' command) that we gave to the
|
||
inferior when it was started. */
|
||
char *run_terminal;
|
||
|
||
/* TTY state. We save it whenever the inferior stops, and restore
|
||
it when it resumes. */
|
||
serial_ttystate ttystate;
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
/* Process group. Saved and restored just like ttystate. */
|
||
PROCESS_GROUP_TYPE process_group;
|
||
#endif
|
||
|
||
/* fcntl flags. Saved and restored just like ttystate. */
|
||
int tflags;
|
||
};
|
||
|
||
/* Our own tty state, which we restore every time we need to deal with
|
||
the terminal. This is only set once, when GDB first starts. The
|
||
settings of flags which readline saves and restores and
|
||
unimportant. */
|
||
static struct terminal_info our_terminal_info;
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
|
||
/* Return the process group of the current inferior. */
|
||
|
||
PROCESS_GROUP_TYPE
|
||
inferior_process_group (void)
|
||
{
|
||
return current_inferior ()->terminal_info->process_group;
|
||
}
|
||
#endif
|
||
|
||
/* While the inferior is running, we want SIGINT and SIGQUIT to go to the
|
||
inferior only. If we have job control, that takes care of it. If not,
|
||
we save our handlers in these two variables and set SIGINT and SIGQUIT
|
||
to SIG_IGN. */
|
||
|
||
static void (*sigint_ours) ();
|
||
static void (*sigquit_ours) ();
|
||
|
||
/* The name of the tty (from the `tty' command) that we're giving to
|
||
the inferior when starting it up. This is only (and should only
|
||
be) used as a transient global by new_tty_prefork,
|
||
create_tty_session, new_tty and new_tty_postfork, all called from
|
||
fork_inferior, while forking a new child. */
|
||
static const char *inferior_thisrun_terminal;
|
||
|
||
/* Nonzero if our terminal settings are in effect. Zero if the
|
||
inferior's settings are in effect. Ignored if !gdb_has_a_terminal
|
||
(). */
|
||
|
||
int terminal_is_ours;
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
static PROCESS_GROUP_TYPE
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||
gdb_getpgrp (void)
|
||
{
|
||
int process_group = -1;
|
||
#ifdef HAVE_TERMIOS
|
||
process_group = tcgetpgrp (0);
|
||
#endif
|
||
#ifdef HAVE_TERMIO
|
||
process_group = getpgrp ();
|
||
#endif
|
||
#ifdef HAVE_SGTTY
|
||
ioctl (0, TIOCGPGRP, &process_group);
|
||
#endif
|
||
return process_group;
|
||
}
|
||
#endif
|
||
|
||
enum
|
||
{
|
||
yes, no, have_not_checked
|
||
}
|
||
gdb_has_a_terminal_flag = have_not_checked;
|
||
|
||
/* Does GDB have a terminal (on stdin)? */
|
||
int
|
||
gdb_has_a_terminal (void)
|
||
{
|
||
switch (gdb_has_a_terminal_flag)
|
||
{
|
||
case yes:
|
||
return 1;
|
||
case no:
|
||
return 0;
|
||
case have_not_checked:
|
||
/* Get all the current tty settings (including whether we have a
|
||
tty at all!). Can't do this in _initialize_inflow because
|
||
serial_fdopen() won't work until the serial_ops_list is
|
||
initialized. */
|
||
|
||
#ifdef F_GETFL
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||
our_terminal_info.tflags = fcntl (0, F_GETFL, 0);
|
||
#endif
|
||
|
||
gdb_has_a_terminal_flag = no;
|
||
if (stdin_serial != NULL)
|
||
{
|
||
our_terminal_info.ttystate = serial_get_tty_state (stdin_serial);
|
||
|
||
if (our_terminal_info.ttystate != NULL)
|
||
{
|
||
gdb_has_a_terminal_flag = yes;
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
our_terminal_info.process_group = gdb_getpgrp ();
|
||
#endif
|
||
}
|
||
}
|
||
|
||
return gdb_has_a_terminal_flag == yes;
|
||
default:
|
||
/* "Can't happen". */
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/* Macro for printing errors from ioctl operations */
|
||
|
||
#define OOPSY(what) \
|
||
if (result == -1) \
|
||
fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \
|
||
what, safe_strerror (errno))
|
||
|
||
static void terminal_ours_1 (int);
|
||
|
||
/* Initialize the terminal settings we record for the inferior,
|
||
before we actually run the inferior. */
|
||
|
||
void
|
||
terminal_init_inferior_with_pgrp (int pgrp)
|
||
{
|
||
if (gdb_has_a_terminal ())
|
||
{
|
||
struct inferior *inf = current_inferior ();
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||
|
||
/* We could just as well copy our_ttystate (if we felt like
|
||
adding a new function serial_copy_tty_state()). */
|
||
xfree (inf->terminal_info->ttystate);
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inf->terminal_info->ttystate
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||
= serial_get_tty_state (stdin_serial);
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
inf->terminal_info->process_group = pgrp;
|
||
#endif
|
||
|
||
/* Make sure that next time we call terminal_inferior (which will be
|
||
before the program runs, as it needs to be), we install the new
|
||
process group. */
|
||
terminal_is_ours = 1;
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||
}
|
||
}
|
||
|
||
/* Save the terminal settings again. This is necessary for the TUI
|
||
when it switches to TUI or non-TUI mode; curses changes the terminal
|
||
and gdb must be able to restore it correctly. */
|
||
|
||
void
|
||
terminal_save_ours (void)
|
||
{
|
||
if (gdb_has_a_terminal ())
|
||
{
|
||
/* We could just as well copy our_ttystate (if we felt like adding
|
||
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);
|
||
}
|
||
}
|
||
|
||
void
|
||
terminal_init_inferior (void)
|
||
{
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
/* This is for Lynx, and should be cleaned up by having Lynx be a separate
|
||
debugging target with a version of target_terminal_init_inferior which
|
||
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
|
||
inferior_ptid to the same routine). */
|
||
/* 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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||
}
|
||
|
||
/* Put the inferior's terminal settings into effect.
|
||
This is preparation for starting or resuming the inferior. */
|
||
|
||
void
|
||
terminal_inferior (void)
|
||
{
|
||
struct inferior *inf;
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||
|
||
if (!terminal_is_ours)
|
||
return;
|
||
|
||
inf = current_inferior ();
|
||
|
||
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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||
{
|
||
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
|
||
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, 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
|
||
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. */
|
||
result = serial_set_tty_state (stdin_serial,
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inf->terminal_info->ttystate);
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||
OOPSY ("setting tty state");
|
||
|
||
if (!job_control)
|
||
{
|
||
sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN);
|
||
#ifdef SIGQUIT
|
||
sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN);
|
||
#endif
|
||
}
|
||
|
||
/* If attach_flag is set, we don't know whether we are sharing a
|
||
terminal with the inferior or not. (attaching a process
|
||
without a terminal is one case where we do not; attaching a
|
||
process which we ran from the same shell as GDB via `&' is
|
||
one case where we do, I think (but perhaps this is not
|
||
`sharing' in the sense that we need to save and restore tty
|
||
state)). I don't know if there is any way to tell whether we
|
||
are sharing a terminal. So what we do is to go through all
|
||
the saving and restoring of the tty state, but ignore errors
|
||
setting the process group, which will happen if we are not
|
||
sharing a terminal). */
|
||
|
||
if (job_control)
|
||
{
|
||
#ifdef HAVE_TERMIOS
|
||
result = tcsetpgrp (0, inf->terminal_info->process_group);
|
||
if (!inf->attach_flag)
|
||
OOPSY ("tcsetpgrp");
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
result = ioctl (0, TIOCSPGRP, &inf->terminal_info->process_group);
|
||
if (!inf->attach_flag)
|
||
OOPSY ("TIOCSPGRP");
|
||
#endif
|
||
}
|
||
|
||
}
|
||
terminal_is_ours = 0;
|
||
}
|
||
|
||
/* Put some of our terminal settings into effect,
|
||
enough to get proper results from our output,
|
||
but do not change into or out of RAW mode
|
||
so that no input is discarded.
|
||
|
||
After doing this, either terminal_ours or terminal_inferior
|
||
should be called to get back to a normal state of affairs. */
|
||
|
||
void
|
||
terminal_ours_for_output (void)
|
||
{
|
||
terminal_ours_1 (1);
|
||
}
|
||
|
||
/* Put our terminal settings into effect.
|
||
First record the inferior's terminal settings
|
||
so they can be restored properly later. */
|
||
|
||
void
|
||
terminal_ours (void)
|
||
{
|
||
terminal_ours_1 (0);
|
||
}
|
||
|
||
/* output_only is not used, and should not be used unless we introduce
|
||
separate terminal_is_ours and terminal_is_ours_for_output
|
||
flags. */
|
||
|
||
static void
|
||
terminal_ours_1 (int output_only)
|
||
{
|
||
struct inferior *inf;
|
||
|
||
if (terminal_is_ours)
|
||
return;
|
||
|
||
/* Checking inferior->run_terminal is necessary so that
|
||
if GDB is running in the background, it won't block trying
|
||
to do the ioctl()'s below. Checking gdb_has_a_terminal
|
||
avoids attempting all the ioctl's when running in batch. */
|
||
|
||
inf = current_inferior ();
|
||
|
||
if (inf->terminal_info->run_terminal != NULL || gdb_has_a_terminal () == 0)
|
||
return;
|
||
|
||
if (!terminal_is_ours)
|
||
{
|
||
#ifdef SIGTTOU
|
||
/* Ignore this signal since it will happen when we try to set the
|
||
pgrp. */
|
||
void (*osigttou) () = NULL;
|
||
#endif
|
||
int result;
|
||
|
||
terminal_is_ours = 1;
|
||
|
||
#ifdef SIGTTOU
|
||
if (job_control)
|
||
osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
|
||
#endif
|
||
|
||
xfree (inf->terminal_info->ttystate);
|
||
inf->terminal_info->ttystate = serial_get_tty_state (stdin_serial);
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
if (!inf->attach_flag)
|
||
/* If setpgrp failed in terminal_inferior, this would give us
|
||
our process group instead of the inferior's. See
|
||
terminal_inferior for details. */
|
||
inf->terminal_info->process_group = gdb_getpgrp ();
|
||
#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
|
||
the tty state when it needs to.
|
||
FIXME-maybe: However, query() expects non-raw mode and doesn't
|
||
use readline. Maybe query should use readline (on the other hand,
|
||
this only matters for HAVE_SGTTY, not termio or termios, I think). */
|
||
|
||
/* 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
|
||
regardless of output_only, because we don't have separate
|
||
terminal_is_ours and terminal_is_ours_for_output flags. It's OK,
|
||
though, since readline will deal with raw mode when/if it needs to.
|
||
*/
|
||
|
||
serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate,
|
||
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);
|
||
}
|