776 lines
20 KiB
C
776 lines
20 KiB
C
/* Low level interface to ptrace, for GDB when running under Unix.
|
||
Copyright 1986-87, 1989, 1991-92, 1995, 1998 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 2 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, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "frame.h"
|
||
#include "inferior.h"
|
||
#include "command.h"
|
||
#include "signals.h"
|
||
#include "serial.h"
|
||
#include "terminal.h"
|
||
#include "target.h"
|
||
#include "gdbthread.h"
|
||
|
||
#include "gdb_string.h"
|
||
#include <signal.h>
|
||
#include <fcntl.h>
|
||
#ifdef HAVE_SYS_SELECT_H
|
||
#include <sys/select.h>
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
#define PROCESS_GROUP_TYPE pid_t
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
#define PROCESS_GROUP_TYPE int
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
#ifdef SHORT_PGRP
|
||
/* This is only used for the ultra. Does it have pid_t? */
|
||
#define PROCESS_GROUP_TYPE short
|
||
#else
|
||
#define PROCESS_GROUP_TYPE int
|
||
#endif
|
||
#endif /* sgtty */
|
||
|
||
#ifdef HAVE_SYS_IOCTL_H
|
||
#include <sys/ioctl.h>
|
||
#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 serial_t stdin_serial;
|
||
|
||
/* TTY state for the inferior. We save it whenever the inferior stops, and
|
||
restore it when it resumes. */
|
||
static serial_ttystate inferior_ttystate;
|
||
|
||
/* Our own tty state, which we restore every time we need to deal with the
|
||
terminal. We only set it once, when GDB first starts. The settings of
|
||
flags which readline saves and restores and unimportant. */
|
||
static serial_ttystate our_ttystate;
|
||
|
||
/* fcntl flags for us and the inferior. Saved and restored just like
|
||
{our,inferior}_ttystate. */
|
||
static int tflags_inferior;
|
||
static int tflags_ours;
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
/* Process group for us and the inferior. Saved and restored just like
|
||
{our,inferior}_ttystate. */
|
||
PROCESS_GROUP_TYPE our_process_group;
|
||
PROCESS_GROUP_TYPE inferior_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 gave to the inferior
|
||
when it was last started. */
|
||
|
||
static 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;
|
||
|
||
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 ()
|
||
{
|
||
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
|
||
tflags_ours = fcntl (0, F_GETFL, 0);
|
||
#endif
|
||
|
||
gdb_has_a_terminal_flag = no;
|
||
stdin_serial = SERIAL_FDOPEN (0);
|
||
if (stdin_serial != NULL)
|
||
{
|
||
our_ttystate = SERIAL_GET_TTY_STATE (stdin_serial);
|
||
|
||
if (our_ttystate != NULL)
|
||
{
|
||
gdb_has_a_terminal_flag = yes;
|
||
#ifdef HAVE_TERMIOS
|
||
our_process_group = tcgetpgrp (0);
|
||
#endif
|
||
#ifdef HAVE_TERMIO
|
||
our_process_group = getpgrp ();
|
||
#endif
|
||
#ifdef HAVE_SGTTY
|
||
ioctl (0, TIOCGPGRP, &our_process_group);
|
||
#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, 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 (pgrp)
|
||
int pgrp;
|
||
{
|
||
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). */
|
||
if (inferior_ttystate)
|
||
free (inferior_ttystate);
|
||
inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial);
|
||
|
||
#ifdef PROCESS_GROUP_TYPE
|
||
inferior_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;
|
||
}
|
||
}
|
||
|
||
void
|
||
terminal_init_inferior ()
|
||
{
|
||
#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
|
||
(and the non-threaded child_terminal_init_inferior can just pass in
|
||
inferior_pid to the same routine). */
|
||
/* We assume INFERIOR_PID is also the child's process group. */
|
||
terminal_init_inferior_with_pgrp (PIDGET (inferior_pid));
|
||
#endif /* PROCESS_GROUP_TYPE */
|
||
}
|
||
|
||
/* Put the inferior's terminal settings into effect.
|
||
This is preparation for starting or resuming the inferior. */
|
||
|
||
void
|
||
terminal_inferior ()
|
||
{
|
||
if (gdb_has_a_terminal () && terminal_is_ours
|
||
&& inferior_thisrun_terminal == 0)
|
||
{
|
||
int result;
|
||
|
||
#ifdef F_GETFL
|
||
/* 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, tflags_inferior);
|
||
result = fcntl (0, F_SETFL, tflags_inferior);
|
||
OOPSY ("fcntl F_SETFL");
|
||
#endif
|
||
|
||
/* 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
|
||
this call, so we don't flush any input. */
|
||
result = SERIAL_SET_TTY_STATE (stdin_serial, inferior_ttystate);
|
||
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, inferior_process_group);
|
||
if (!attach_flag)
|
||
OOPSY ("tcsetpgrp");
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
result = ioctl (0, TIOCSPGRP, &inferior_process_group);
|
||
if (!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 ()
|
||
{
|
||
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 ()
|
||
{
|
||
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 (output_only)
|
||
int output_only;
|
||
{
|
||
/* Checking inferior_thisrun_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. */
|
||
if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0)
|
||
return;
|
||
|
||
if (!terminal_is_ours)
|
||
{
|
||
/* Ignore this signal since it will happen when we try to set the
|
||
pgrp. */
|
||
void (*osigttou) ();
|
||
int result;
|
||
|
||
terminal_is_ours = 1;
|
||
|
||
#ifdef SIGTTOU
|
||
if (job_control)
|
||
osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
|
||
#endif
|
||
|
||
if (inferior_ttystate)
|
||
free (inferior_ttystate);
|
||
inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial);
|
||
#ifdef HAVE_TERMIOS
|
||
inferior_process_group = tcgetpgrp (0);
|
||
#endif
|
||
#ifdef HAVE_TERMIO
|
||
inferior_process_group = getpgrp ();
|
||
#endif
|
||
#ifdef HAVE_SGTTY
|
||
ioctl (0, TIOCGPGRP, &inferior_process_group);
|
||
#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_ttystate,
|
||
inferior_ttystate);
|
||
|
||
if (job_control)
|
||
{
|
||
#ifdef HAVE_TERMIOS
|
||
result = tcsetpgrp (0, our_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",
|
||
strerror (errno));
|
||
#endif
|
||
#endif /* termios */
|
||
|
||
#ifdef HAVE_SGTTY
|
||
result = ioctl (0, TIOCSPGRP, &our_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
|
||
tflags_inferior = 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, tflags_ours);
|
||
result = fcntl (0, F_SETFL, tflags_ours);
|
||
#endif
|
||
|
||
result = result; /* lint */
|
||
}
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
void
|
||
term_info (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
target_terminal_info (arg, from_tty);
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
void
|
||
child_terminal_info (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
if (!gdb_has_a_terminal ())
|
||
{
|
||
printf_filtered ("This GDB does not control a terminal.\n");
|
||
return;
|
||
}
|
||
|
||
printf_filtered ("Inferior's terminal status (currently saved by GDB):\n");
|
||
|
||
/* First the fcntl flags. */
|
||
{
|
||
int flags;
|
||
|
||
flags = tflags_inferior;
|
||
|
||
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) inferior_process_group);
|
||
#endif
|
||
|
||
SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_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 (ttyname)
|
||
char *ttyname;
|
||
{
|
||
/* Save the name for later, for determining whether we and the child
|
||
are sharing a tty. */
|
||
inferior_thisrun_terminal = ttyname;
|
||
}
|
||
|
||
void
|
||
new_tty ()
|
||
{
|
||
register 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. */
|
||
|
||
#ifdef USE_O_NOCTTY
|
||
tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY);
|
||
#else
|
||
tty = open (inferior_thisrun_terminal, O_RDWR);
|
||
#endif
|
||
if (tty == -1)
|
||
{
|
||
print_sys_errmsg (inferior_thisrun_terminal, errno);
|
||
_exit (1);
|
||
}
|
||
|
||
/* Avoid use of dup2; doesn't exist on all systems. */
|
||
if (tty != 0)
|
||
{
|
||
close (0);
|
||
dup (tty);
|
||
}
|
||
if (tty != 1)
|
||
{
|
||
close (1);
|
||
dup (tty);
|
||
}
|
||
if (tty != 2)
|
||
{
|
||
close (2);
|
||
dup (tty);
|
||
}
|
||
if (tty > 2)
|
||
close (tty);
|
||
#endif /* !go32 && !win32 */
|
||
}
|
||
|
||
/* Kill the inferior process. Make us have no inferior. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
kill_command (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
/* FIXME: This should not really be inferior_pid (or target_has_execution).
|
||
It should be a distinct flag that indicates that a target is active, cuz
|
||
some targets don't have processes! */
|
||
|
||
if (inferior_pid == 0)
|
||
error ("The program is not being run.");
|
||
if (!query ("Kill the program being debugged? "))
|
||
error ("Not confirmed.");
|
||
target_kill ();
|
||
|
||
init_thread_list (); /* Destroy thread info */
|
||
|
||
/* Killing off the inferior can leave us with a core file. If so,
|
||
print the state we are left in. */
|
||
if (target_has_stack)
|
||
{
|
||
printf_filtered ("In %s,\n", target_longname);
|
||
if (selected_frame == NULL)
|
||
fputs_filtered ("No selected stack frame.\n", gdb_stdout);
|
||
else
|
||
print_stack_frame (selected_frame, selected_frame_level, 1);
|
||
}
|
||
}
|
||
|
||
/* Call set_sigint_trap when you need to pass a signal on to an attached
|
||
process when handling SIGINT */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
pass_signal (signo)
|
||
int signo;
|
||
{
|
||
#ifndef _WIN32
|
||
kill (PIDGET (inferior_pid), SIGINT);
|
||
#endif
|
||
}
|
||
|
||
static void (*osig) ();
|
||
|
||
void
|
||
set_sigint_trap ()
|
||
{
|
||
if (attach_flag || inferior_thisrun_terminal)
|
||
{
|
||
osig = (void (*)()) signal (SIGINT, pass_signal);
|
||
}
|
||
}
|
||
|
||
void
|
||
clear_sigint_trap ()
|
||
{
|
||
if (attach_flag || inferior_thisrun_terminal)
|
||
{
|
||
signal (SIGINT, osig);
|
||
}
|
||
}
|
||
|
||
#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
|
||
static void (*old_sigio) ();
|
||
|
||
static void
|
||
handle_sigio (signo)
|
||
int signo;
|
||
{
|
||
int numfds;
|
||
fd_set readfds;
|
||
|
||
signal (SIGIO, handle_sigio);
|
||
|
||
FD_ZERO (&readfds);
|
||
FD_SET (target_activity_fd, &readfds);
|
||
numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL);
|
||
if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds))
|
||
{
|
||
#ifndef _WIN32
|
||
if ((*target_activity_function) ())
|
||
kill (inferior_pid, SIGINT);
|
||
#endif
|
||
}
|
||
}
|
||
|
||
static int old_fcntl_flags;
|
||
|
||
void
|
||
set_sigio_trap ()
|
||
{
|
||
if (target_activity_function)
|
||
{
|
||
old_sigio = (void (*)()) signal (SIGIO, handle_sigio);
|
||
fcntl (target_activity_fd, F_SETOWN, getpid ());
|
||
old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0);
|
||
fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC);
|
||
}
|
||
}
|
||
|
||
void
|
||
clear_sigio_trap ()
|
||
{
|
||
if (target_activity_function)
|
||
{
|
||
signal (SIGIO, old_sigio);
|
||
fcntl (target_activity_fd, F_SETFL, old_fcntl_flags);
|
||
}
|
||
}
|
||
#else /* No SIGIO. */
|
||
void
|
||
set_sigio_trap ()
|
||
{
|
||
if (target_activity_function)
|
||
abort ();
|
||
}
|
||
|
||
void
|
||
clear_sigio_trap ()
|
||
{
|
||
if (target_activity_function)
|
||
abort ();
|
||
}
|
||
#endif /* No SIGIO. */
|
||
|
||
|
||
/* 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 ()
|
||
{
|
||
int retval = 0;
|
||
|
||
if (job_control)
|
||
{
|
||
#if defined (NEED_POSIX_SETPGID) || (defined (HAVE_TERMIOS) && defined (HAVE_SETPGID))
|
||
/* 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
|
||
#if defined (TIOCGPGRP)
|
||
#if defined(USG) && !defined(SETPGRP_ARGS)
|
||
retval = setpgrp ();
|
||
#else
|
||
retval = setpgrp (getpid (), getpid ());
|
||
#endif /* USG */
|
||
#endif /* TIOCGPGRP. */
|
||
#endif /* NEED_POSIX_SETPGID */
|
||
}
|
||
return retval;
|
||
}
|
||
|
||
void
|
||
_initialize_inflow ()
|
||
{
|
||
add_info ("terminal", term_info,
|
||
"Print inferior's saved terminal status.");
|
||
|
||
add_com ("kill", class_run, kill_command,
|
||
"Kill execution of program being debugged.");
|
||
|
||
inferior_pid = 0;
|
||
|
||
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 */
|
||
}
|