/* Low level interface to ptrace, for GDB when running under Unix.
- Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
+ 1996, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
-This file is part of GDB.
+ 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 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.
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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 <stdio.h>
#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"
-#ifdef USG
-#include <sys/types.h>
+#include "gdb_string.h"
+#include <signal.h>
+#include <fcntl.h>
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
#endif
-/* Some USG-esque systems (some of which are BSD-esque enough so that USG
- is not defined) want this header, and it won't do any harm. */
-#include <fcntl.h>
+#include "inflow.h"
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <signal.h>
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
-extern char *strerror(); /* strings corresponding to errno */
+#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
+static void handle_sigio (int);
+#endif
-extern struct target_ops child_ops;
+extern void _initialize_inflow (void);
-/* Nonzero if we are debugging an attached outside process
- rather than an inferior. */
+static void pass_signal (int);
-int attach_flag;
+static void kill_command (char *, int);
+static void terminal_ours_1 (int);
\f
/* Record terminal status separately for debugger and inferior. */
-/* Does GDB have a terminal (on stdin)? */
-int gdb_has_a_terminal;
+static struct serial *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;
-static TERMINAL sg_inferior;
-static TERMINAL sg_ours;
+/* 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;
-#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
-static struct tchars tc_inferior;
-static struct tchars tc_ours;
-#endif
-
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
-static struct ltchars ltc_inferior;
-static struct ltchars ltc_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
-#ifdef TIOCLGET
-static int lmode_inferior;
-static int lmode_ours;
-#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. */
-#ifdef TIOCGPGRP
-# ifdef SHORT_PGRP
-static short pgrp_inferior;
-static short pgrp_ours;
-# else
-static int pgrp_inferior;
-static int pgrp_ours;
-# endif
-#else
static void (*sigint_ours) ();
static void (*sigquit_ours) ();
-#endif /* TIOCGPGRP */
/* 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. */
+/* 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 (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
+ tflags_ours = fcntl (0, F_GETFL, 0);
+#endif
-static int terminal_is_ours;
+ 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(stderr, "[%s failed in terminal_inferior: %s]\n", \
- what, strerror (errno))
+ fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \
+ what, safe_strerror (errno))
-static void terminal_ours_1 ();
+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 ()
+terminal_init_inferior_with_pgrp (int pgrp)
{
- sg_inferior = sg_ours;
- tflags_inferior = tflags_ours;
-
-#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
- tc_inferior = tc_ours;
+ 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)
+ xfree (inferior_ttystate);
+ inferior_ttystate = serial_get_tty_state (stdin_serial);
+
+#ifdef PROCESS_GROUP_TYPE
+ inferior_process_group = pgrp;
#endif
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
- ltc_inferior = ltc_ours;
-#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;
+ }
+}
-#ifdef TIOCLGET
- lmode_inferior = lmode_ours;
-#endif
+/* 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. */
-#ifdef TIOCGPGRP
- pgrp_inferior = inferior_pid;
-#endif /* TIOCGPGRP */
+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). */
+ if (our_ttystate)
+ xfree (our_ttystate);
+ our_ttystate = serial_get_tty_state (stdin_serial);
+ }
+}
- terminal_is_ours = 1;
+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
+ (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. */
+ terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid));
+#endif /* PROCESS_GROUP_TYPE */
}
/* Put the inferior's terminal settings into effect.
This is preparation for starting or resuming the inferior. */
void
-terminal_inferior ()
+terminal_inferior (void)
{
- int result;
-
- if (gdb_has_a_terminal && terminal_is_ours && inferior_thisrun_terminal == 0)
+ 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");
- result = ioctl (0, TIOCSETN, &sg_inferior);
- OOPSY ("ioctl TIOCSETN");
+#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 defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
- result = ioctl (0, TIOCSETC, &tc_inferior);
- OOPSY ("ioctl TIOCSETC");
+ if (!job_control)
+ {
+ sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN);
+#ifdef SIGQUIT
+ sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN);
#endif
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
- result = ioctl (0, TIOCSLTC, <c_inferior);
- OOPSY ("ioctl TIOCSLTC");
+ }
+
+ /* 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 TIOCLGET
- result = ioctl (0, TIOCLSET, &lmode_inferior);
- OOPSY ("ioctl TIOCLSET");
+
+#ifdef HAVE_SGTTY
+ result = ioctl (0, TIOCSPGRP, &inferior_process_group);
+ if (!attach_flag)
+ OOPSY ("TIOCSPGRP");
#endif
+ }
-#ifdef TIOCGPGRP
- result = ioctl (0, TIOCSPGRP, &pgrp_inferior);
- OOPSY ("ioctl TIOCSPGRP");
-#else
- sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN);
- sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN);
-#endif /* TIOCGPGRP */
}
terminal_is_ours = 0;
}
should be called to get back to a normal state of affairs. */
void
-terminal_ours_for_output ()
+terminal_ours_for_output (void)
{
terminal_ours_1 (1);
}
so they can be restored properly later. */
void
-terminal_ours ()
+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 (output_only)
- int output_only;
+terminal_ours_1 (int output_only)
{
- int result;
-#ifdef TIOCGPGRP
- /* Ignore this signal since it will happen when we try to set the pgrp. */
- void (*osigttou) ();
-#endif /* TIOCGPGRP */
-
/* 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)
+ if (inferior_thisrun_terminal != 0 || 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 TIOCGPGRP
- osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN);
+#ifdef SIGTTOU
+ if (job_control)
+ osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
+#endif
- result = ioctl (0, TIOCGPGRP, &pgrp_inferior);
- result = ioctl (0, TIOCSPGRP, &pgrp_ours);
+ if (inferior_ttystate)
+ xfree (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
- signal (SIGTTOU, osigttou);
-#else
- signal (SIGINT, sigint_ours);
- signal (SIGQUIT, sigquit_ours);
-#endif /* TIOCGPGRP */
+ /* 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). */
- tflags_inferior = fcntl (0, F_GETFL, 0);
- result = ioctl (0, TIOCGETP, &sg_inferior);
+ /* 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 defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
- result = ioctl (0, TIOCGETC, &tc_inferior);
+ 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",
+ safe_strerror (errno));
#endif
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
- result = ioctl (0, TIOCGLTC, <c_inferior);
+#endif /* termios */
+
+#ifdef HAVE_SGTTY
+ result = ioctl (0, TIOCSPGRP, &our_process_group);
#endif
-#ifdef TIOCLGET
- result = ioctl (0, TIOCLGET, &lmode_inferior);
+ }
+
+#ifdef SIGTTOU
+ if (job_control)
+ signal (SIGTTOU, osigttou);
#endif
- }
-#ifdef HAVE_TERMIO
- sg_ours.c_lflag |= ICANON;
- if (output_only && !(sg_inferior.c_lflag & ICANON))
- sg_ours.c_lflag &= ~ICANON;
-#else /* not HAVE_TERMIO */
- sg_ours.sg_flags &= ~RAW & ~CBREAK;
- if (output_only)
- sg_ours.sg_flags |= (RAW | CBREAK) & sg_inferior.sg_flags;
-#endif /* not HAVE_TERMIO */
+ if (!job_control)
+ {
+ signal (SIGINT, sigint_ours);
+#ifdef SIGQUIT
+ signal (SIGQUIT, sigquit_ours);
+#endif
+ }
- result = fcntl (0, F_SETFL, tflags_ours);
- result = fcntl (0, F_SETFL, tflags_ours);
- result = ioctl (0, TIOCSETN, &sg_ours);
+#ifdef F_GETFL
+ tflags_inferior = fcntl (0, F_GETFL, 0);
-#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
- result = ioctl (0, TIOCSETC, &tc_ours);
-#endif
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
- result = ioctl (0, TIOCSLTC, <c_ours);
-#endif
-#ifdef TIOCLGET
- result = ioctl (0, TIOCLSET, &lmode_ours);
+ /* 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
-#ifdef HAVE_TERMIO
- sg_ours.c_lflag |= ICANON;
-#else /* not HAVE_TERMIO */
- sg_ours.sg_flags &= ~RAW & ~CBREAK;
-#endif /* not HAVE_TERMIO */
+ result = result; /* lint */
+ }
}
/* ARGSUSED */
void
-term_info (arg, from_tty)
- char *arg;
- int from_tty;
+term_info (char *arg, int from_tty)
{
target_terminal_info (arg, from_tty);
}
/* ARGSUSED */
void
-child_terminal_info (args, from_tty)
- char *args;
- int from_tty;
+child_terminal_info (char *args, int from_tty)
{
- register int i;
-
- if (!gdb_has_a_terminal) {
- printf_filtered ("This GDB does not control a terminal.\n");
- return;
- }
+ 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");
- printf_filtered ("owner pgrp = %d, fcntl flags = 0x%x.\n",
- pgrp_inferior, tflags_inferior);
+ /* First the fcntl flags. */
+ {
+ int flags;
-#ifdef HAVE_TERMIO
+ flags = tflags_inferior;
- printf_filtered (c_iflag = 0x%x, c_oflag = 0x%x,\n",
- sg_inferior.c_iflag, sg_inferior.c_oflag);
- printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
- sg_inferior.c_cflag, sg_inferior.c_lflag, sg_inferior.c_line);
- printf_filtered ("c_cc: ");
- for (i = 0; (i < NCC); i += 1)
- printf_filtered ("0x%x ", sg_inferior.c_cc[i]);
- printf_filtered ("\n");
+ printf_filtered ("File descriptor flags = ");
-#else /* not HAVE_TERMIO */
+#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
- printf_filtered ("sgttyb.sg_flags = 0x%x.\n", sg_inferior.sg_flags);
+#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
-#endif /* not HAVE_TERMIO */
+ if (flags & O_APPEND)
+ printf_filtered (" | O_APPEND");
+ flags &= ~O_APPEND;
-#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
- printf_filtered ("tchars: ");
- for (i = 0; i < (int)sizeof (struct tchars); i++)
- printf_filtered ("0x%x ", ((unsigned char *)&tc_inferior)[i]);
- printf_filtered ("\n");
+#if defined (O_BINARY)
+ if (flags & O_BINARY)
+ printf_filtered (" | O_BINARY");
+ flags &= ~O_BINARY;
#endif
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
- printf_filtered ("ltchars: ");
- for (i = 0; i < (int)sizeof (struct ltchars); i++)
- printf_filtered ("0x%x ", ((unsigned char *)<c_inferior)[i]);
- printf_filtered ("\n");
-#endif
-
-#ifdef TIOCLGET
- printf_filtered ("lmode: 0x%x\n", lmode_inferior);
+ 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);
}
\f
/* NEW_TTY_PREFORK is called before forking a new child process,
the terminal specified in the NEW_TTY_PREFORK call. */
void
-new_tty_prefork (ttyname)
- char *ttyname;
+new_tty_prefork (char *ttyname)
{
/* Save the name for later, for determining whether we and the child
are sharing a tty. */
}
void
-new_tty ()
+new_tty (void)
{
- register int tty;
+ int tty;
if (inferior_thisrun_terminal == 0)
return;
-
+#if !defined(__GO32__) && !defined(_WIN32)
#ifdef TIOCNOTTY
- /* Disconnect the child process from our controlling terminal. */
- tty = open("/dev/tty", O_RDWR);
+ /* 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)
{
- ioctl(tty, TIOCNOTTY, 0);
- close(tty);
+ 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);
+ tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY);
#else
- tty = open(inferior_thisrun_terminal, O_RDWR);
+ tty = open (inferior_thisrun_terminal, O_RDWR);
#endif
if (tty == -1)
{
print_sys_errmsg (inferior_thisrun_terminal, errno);
- _exit(1);
+ _exit (1);
}
/* Avoid use of dup2; doesn't exist on all systems. */
if (tty != 0)
- { close (0); dup (tty); }
+ {
+ close (0);
+ dup (tty);
+ }
if (tty != 1)
- { close (1); dup (tty); }
+ {
+ close (1);
+ dup (tty);
+ }
if (tty != 2)
- { close (2); dup (tty); }
+ {
+ close (2);
+ dup (tty);
+ }
if (tty > 2)
- close(tty);
+ close (tty);
+#endif /* !go32 && !win32 */
}
\f
/* Kill the inferior process. Make us have no inferior. */
/* ARGSUSED */
static void
-kill_command (arg, from_tty)
- char *arg;
- int from_tty;
+kill_command (char *arg, int from_tty)
{
- if (inferior_pid == 0)
+ /* FIXME: This should not really be inferior_ptid (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 (ptid_equal (inferior_ptid, null_ptid))
error ("The program is not being run.");
- if (!query ("Kill the inferior process? "))
+ if (!query ("Kill the program being debugged? "))
error ("Not confirmed.");
- target_kill (arg, from_tty);
+ 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", current_target->to_longname);
- if (selected_frame == NULL)
- fputs_filtered ("No selected stack frame.\n", stdout);
- else
- print_stack_frame (selected_frame, selected_frame_level, 1);
- }
+ if (target_has_stack)
+ {
+ printf_filtered ("In %s,\n", target_longname);
+ if (deprecated_selected_frame == NULL)
+ fputs_filtered ("No selected stack frame.\n", gdb_stdout);
+ else
+ print_stack_frame (deprecated_selected_frame,
+ frame_relative_level (deprecated_selected_frame), 1);
+ }
+}
+\f
+/* Call set_sigint_trap when you need to pass a signal on to an attached
+ process when handling SIGINT */
+
+/* ARGSUSED */
+static void
+pass_signal (int signo)
+{
+#ifndef _WIN32
+ kill (PIDGET (inferior_ptid), SIGINT);
+#endif
}
-/* The inferior process has died. Long live the inferior! */
+static void (*osig) ();
void
-generic_mourn_inferior ()
+set_sigint_trap (void)
{
- inferior_pid = 0;
- attach_flag = 0;
- mark_breakpoints_out ();
- registers_changed ();
-
-#ifdef CLEAR_DEFERRED_STORES
- /* Delete any pending stores to the inferior... */
- CLEAR_DEFERRED_STORES;
-#endif
-
- reopen_exec_file ();
- if (target_has_stack) {
- set_current_frame ( create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
- select_frame (get_current_frame (), 0);
- } else {
- set_current_frame (0);
- select_frame ((FRAME) 0, -1);
- }
- /* It is confusing to the user for ignore counts to stick around
- from previous runs of the inferior. So clear them. */
- breakpoint_clear_ignore_counts ();
+ if (attach_flag || inferior_thisrun_terminal)
+ {
+ osig = (void (*)()) signal (SIGINT, pass_signal);
+ }
}
void
-child_mourn_inferior ()
+clear_sigint_trap (void)
{
- unpush_target (&child_ops);
- generic_mourn_inferior ();
+ if (attach_flag || inferior_thisrun_terminal)
+ {
+ signal (SIGINT, osig);
+ }
}
\f
-#if 0
-/* This function is just for testing, and on some systems (Sony NewsOS
- 3.2) <sys/user.h> also includes <sys/time.h> which leads to errors
- (since on this system at least sys/time.h is not protected against
- multiple inclusion). */
-/* ARGSUSED */
+#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
+static void (*old_sigio) ();
+
static void
-try_writing_regs_command (arg, from_tty)
- char *arg;
- int from_tty;
+handle_sigio (int signo)
{
- register int i;
- register int value;
-
- if (inferior_pid == 0)
- error ("There is no inferior process now.");
-
- /* A Sun 3/50 or 3/60 (at least) running SunOS 4.0.3 will have a
- kernel panic if we try to write past the end of the user area.
- Presumably Sun will fix this bug (it has been reported), but it
- is tacky to crash the system, so at least on SunOS4 we need to
- stop writing when we hit the end of the user area. */
- for (i = 0; i < sizeof (struct user); i += 2)
+ 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))
{
- QUIT;
- errno = 0;
- value = call_ptrace (3, inferior_pid, i, 0);
- call_ptrace (6, inferior_pid, i, value);
- if (errno == 0)
- {
- printf (" Succeeded with address 0x%x; value 0x%x (%d).\n",
- i, value, value);
- }
- else if ((i & 0377) == 0)
- printf (" Failed at 0x%x.\n", i);
+#ifndef _WIN32
+ if ((*target_activity_function) ())
+ kill (PIDGET (inferior_ptid), SIGINT);
+#endif
}
}
-#endif
-\f
+
+static int old_fcntl_flags;
+
void
-_initialize_inflow ()
+set_sigio_trap (void)
{
- int result;
+ 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);
+ }
+}
- add_info ("terminal", term_info,
- "Print inferior's saved terminal status.");
+void
+clear_sigio_trap (void)
+{
+ if (target_activity_function)
+ {
+ signal (SIGIO, old_sigio);
+ fcntl (target_activity_fd, F_SETFL, old_fcntl_flags);
+ }
+}
+#else /* No SIGIO. */
+void
+set_sigio_trap (void)
+{
+ if (target_activity_function)
+ internal_error (__FILE__, __LINE__, "failed internal consistency check");
+}
-#if 0
- add_com ("try-writing-regs", class_obscure, try_writing_regs_command,
- "Try writing all locations in inferior's system block.\n\
-Report which ones can be written.");
+void
+clear_sigio_trap (void)
+{
+ if (target_activity_function)
+ internal_error (__FILE__, __LINE__, "failed internal consistency check");
+}
+#endif /* No SIGIO. */
+\f
+
+/* 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;
+}
+
+void
+_initialize_inflow (void)
+{
+ 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;
+ inferior_ptid = null_ptid;
- /* Get all the current tty settings (including whether we have a tty at
- all!). */
+ terminal_is_ours = 1;
- tflags_ours = fcntl (0, F_GETFL, 0);
- OOPSY ("fcntl F_GETFL"); /* Should always work */
+ /* OK, figure out whether we have job control. If neither termios nor
+ sgtty (i.e. termio or go32), leave job_control 0. */
- result = ioctl (0, TIOCGETP, &sg_ours);
- if (result == 0) {
- gdb_has_a_terminal = 1;
- /* Get the rest of the tty settings, then... */
-#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
- ioctl (0, TIOCGETC, &tc_ours);
-#endif
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
- ioctl (0, TIOCGLTC, <c_ours);
-#endif
-#ifdef TIOCLGET
- ioctl (0, TIOCLGET, &lmode_ours);
-#endif
+#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
- ioctl (0, TIOCGPGRP, &pgrp_ours);
+ job_control = 1;
+#else
+ job_control = 0;
#endif /* TIOCGPGRP */
- } else {
- gdb_has_a_terminal = 0;
- }
-
- terminal_is_ours = 1;
+#endif /* sgtty */
}
projects / binutils.git / blobdiff