490 lines
12 KiB
C
490 lines
12 KiB
C
/* Low level interface to ptrace, for GDB when running under Unix.
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Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB 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 1, or (at your option)
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any later version.
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GDB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "param.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 "signals.h"
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#include "terminal.h"
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#include "target.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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/* Some USG-esque systems (some of which are BSD-esque enough so that USG
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is not defined) want this header, and it won't do any harm. */
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#include <fcntl.h>
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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extern struct target_ops child_ops;
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/* Nonzero if we are debugging an attached outside process
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rather than an inferior. */
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int attach_flag;
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/* Record terminal status separately for debugger and inferior. */
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static TERMINAL sg_inferior;
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static TERMINAL sg_ours;
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static int tflags_inferior;
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static int tflags_ours;
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#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
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static struct tchars tc_inferior;
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static struct tchars tc_ours;
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#endif
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#ifdef TIOCGLTC
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static struct ltchars ltc_inferior;
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static struct ltchars ltc_ours;
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#endif
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#ifdef TIOCLGET
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static int lmode_inferior;
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static int lmode_ours;
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#endif
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#ifdef TIOCGPGRP
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static int pgrp_inferior;
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static int pgrp_ours;
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#else
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static void (*sigint_ours) ();
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static void (*sigquit_ours) ();
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#endif /* TIOCGPGRP */
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/* Copy of inferior_io_terminal when inferior was last started. */
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static char *inferior_thisrun_terminal;
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static void terminal_ours_1 ();
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/* Nonzero if our terminal settings are in effect.
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Zero if the inferior's settings are in effect. */
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static int terminal_is_ours;
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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 ()
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{
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sg_inferior = sg_ours;
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tflags_inferior = tflags_ours;
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#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
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tc_inferior = tc_ours;
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#endif
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#ifdef TIOCGLTC
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ltc_inferior = ltc_ours;
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#endif
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#ifdef TIOCLGET
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lmode_inferior = lmode_ours;
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#endif
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#ifdef TIOCGPGRP
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pgrp_inferior = inferior_pid;
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#endif /* TIOCGPGRP */
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terminal_is_ours = 1;
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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 ()
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{
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if (terminal_is_ours && inferior_thisrun_terminal == 0)
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{
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fcntl (0, F_SETFL, tflags_inferior);
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fcntl (0, F_SETFL, tflags_inferior);
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ioctl (0, TIOCSETN, &sg_inferior);
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#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
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ioctl (0, TIOCSETC, &tc_inferior);
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#endif
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#ifdef TIOCGLTC
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ioctl (0, TIOCSLTC, <c_inferior);
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#endif
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#ifdef TIOCLGET
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ioctl (0, TIOCLSET, &lmode_inferior);
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#endif
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#ifdef TIOCGPGRP
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ioctl (0, TIOCSPGRP, &pgrp_inferior);
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#else
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sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN);
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sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN);
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#endif /* TIOCGPGRP */
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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 ()
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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 ()
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{
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terminal_ours_1 (0);
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}
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static void
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terminal_ours_1 (output_only)
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int output_only;
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{
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#ifdef TIOCGPGRP
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/* Ignore this signal since it will happen when we try to set the pgrp. */
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void (*osigttou) ();
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#endif /* TIOCGPGRP */
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/* The check for inferior_thisrun_terminal had been commented out
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when the call to ioctl (TIOCNOTTY) was commented out.
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Checking inferior_thisrun_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. */
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if (inferior_thisrun_terminal != 0)
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return;
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if (!terminal_is_ours)
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{
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terminal_is_ours = 1;
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#ifdef TIOCGPGRP
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osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN);
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ioctl (0, TIOCGPGRP, &pgrp_inferior);
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ioctl (0, TIOCSPGRP, &pgrp_ours);
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signal (SIGTTOU, osigttou);
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#else
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signal (SIGINT, sigint_ours);
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signal (SIGQUIT, sigquit_ours);
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#endif /* TIOCGPGRP */
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tflags_inferior = fcntl (0, F_GETFL, 0);
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ioctl (0, TIOCGETP, &sg_inferior);
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#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
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ioctl (0, TIOCGETC, &tc_inferior);
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#endif
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#ifdef TIOCGLTC
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ioctl (0, TIOCGLTC, <c_inferior);
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#endif
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#ifdef TIOCLGET
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ioctl (0, TIOCLGET, &lmode_inferior);
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#endif
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}
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#ifdef HAVE_TERMIO
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sg_ours.c_lflag |= ICANON;
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if (output_only && !(sg_inferior.c_lflag & ICANON))
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sg_ours.c_lflag &= ~ICANON;
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#else /* not HAVE_TERMIO */
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sg_ours.sg_flags &= ~RAW & ~CBREAK;
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if (output_only)
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sg_ours.sg_flags |= (RAW | CBREAK) & sg_inferior.sg_flags;
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#endif /* not HAVE_TERMIO */
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fcntl (0, F_SETFL, tflags_ours);
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fcntl (0, F_SETFL, tflags_ours);
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ioctl (0, TIOCSETN, &sg_ours);
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#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
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ioctl (0, TIOCSETC, &tc_ours);
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#endif
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#ifdef TIOCGLTC
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ioctl (0, TIOCSLTC, <c_ours);
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#endif
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#ifdef TIOCLGET
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ioctl (0, TIOCLSET, &lmode_ours);
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#endif
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#ifdef HAVE_TERMIO
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sg_ours.c_lflag |= ICANON;
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#else /* not HAVE_TERMIO */
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sg_ours.sg_flags &= ~RAW & ~CBREAK;
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#endif /* not HAVE_TERMIO */
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}
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/* ARGSUSED */
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void
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term_info (arg, from_tty)
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char *arg;
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int from_tty;
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{
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target_terminal_info (arg, from_tty);
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}
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void
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child_terminal_info (args, from_tty)
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char *args;
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int from_tty;
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{
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register int i;
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printf_filtered ("Inferior's terminal status (currently saved by GDB):\n");
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#ifdef HAVE_TERMIO
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printf_filtered ("fcntl flags = 0x%x, c_iflag = 0x%x, c_oflag = 0x%x,\n",
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tflags_inferior, sg_inferior.c_iflag, sg_inferior.c_oflag);
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printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
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sg_inferior.c_cflag, sg_inferior.c_lflag, sg_inferior.c_line);
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printf_filtered ("c_cc: ");
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for (i = 0; (i < NCC); i += 1)
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printf_filtered ("0x%x ", sg_inferior.c_cc[i]);
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printf_filtered ("\n");
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#else /* not HAVE_TERMIO */
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printf_filtered ("fcntl flags = 0x%x, sgttyb.sg_flags = 0x%x, owner pid = %d.\n",
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tflags_inferior, sg_inferior.sg_flags, pgrp_inferior);
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#endif /* not HAVE_TERMIO */
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#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
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printf_filtered ("tchars: ");
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for (i = 0; i < (int)sizeof (struct tchars); i++)
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printf_filtered ("0x%x ", ((char *)&tc_inferior)[i]);
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printf_filtered ("\n");
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#endif
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#ifdef TIOCGLTC
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printf_filtered ("ltchars: ");
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for (i = 0; i < (int)sizeof (struct ltchars); i++)
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printf_filtered ("0x%x ", ((char *)<c_inferior)[i]);
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printf_filtered ("\n");
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#endif
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#ifdef TIOCLGET
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printf_filtered ("lmode: 0x%x\n", lmode_inferior);
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#endif
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}
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/* NEW_TTY is called in new child processes under Unix, which will
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become debugger target processes.
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If the TTYNAME argument is non-null, we switch to that tty for further
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input and output. In either case, we remember the setup. */
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void
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new_tty (ttyname)
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char *ttyname;
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{
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register int tty;
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/* Save the name for later, for determining whether we and the child
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are sharing a tty. */
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inferior_thisrun_terminal = ttyname;
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if (ttyname == 0)
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return;
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#ifdef TIOCNOTTY
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/* Disconnect the child process from our controlling terminal. */
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tty = open("/dev/tty", O_RDWR);
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if (tty > 0)
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{
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ioctl(tty, TIOCNOTTY, 0);
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close(tty);
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}
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#endif
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/* Now open the specified new terminal. */
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tty = open(ttyname, O_RDWR);
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if (tty == -1)
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{
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print_sys_errmsg (ttyname, errno);
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_exit(1);
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}
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/* Avoid use of dup2; doesn't exist on all systems. */
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if (tty != 0)
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{ close (0); dup (tty); }
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if (tty != 1)
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{ close (1); dup (tty); }
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if (tty != 2)
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{ close (2); dup (tty); }
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if (tty > 2)
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close(tty);
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}
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/* Kill the inferior process. Make us have no inferior. */
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/* ARGSUSED */
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static void
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kill_command (arg, from_tty)
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char *arg;
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int from_tty;
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{
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if (inferior_pid == 0)
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error ("The program is not being run.");
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if (!query ("Kill the inferior process? "))
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error ("Not confirmed.");
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target_kill (arg, from_tty);
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/* Killing off the inferior can leave us with a core file. If so,
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print the state we are left in. */
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if (target_has_stack) {
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printf_filtered ("In %s,\n", current_target->to_longname);
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if (selected_frame == NULL)
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fputs_filtered ("No selected stack frame.\n", stdout);
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else
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print_sel_frame (0);
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}
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}
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/* The inferior process has died. Long live the inferior! */
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void
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generic_mourn_inferior ()
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{
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inferior_pid = 0;
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attach_flag = 0;
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mark_breakpoints_out ();
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registers_changed ();
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#ifdef CLEAR_DEFERRED_STORES
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/* Delete any pending stores to the inferior... */
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CLEAR_DEFERRED_STORES;
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#endif
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reopen_exec_file ();
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if (target_has_stack) {
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set_current_frame ( create_new_frame (read_register (FP_REGNUM),
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read_pc ()));
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select_frame (get_current_frame (), 0);
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} else {
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set_current_frame (0);
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select_frame ((FRAME) 0, -1);
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}
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/* It is confusing to the user for ignore counts to stick around
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from previous runs of the inferior. So clear them. */
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breakpoint_clear_ignore_counts ();
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}
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void
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child_mourn_inferior ()
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{
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unpush_target (&child_ops);
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generic_mourn_inferior ();
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}
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#if 0
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/* This function is just for testing, and on some systems (Sony NewsOS
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3.2) <sys/user.h> also includes <sys/time.h> which leads to errors
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(since on this system at least sys/time.h is not protected against
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multiple inclusion). */
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/* ARGSUSED */
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static void
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try_writing_regs_command (arg, from_tty)
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char *arg;
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int from_tty;
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{
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register int i;
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register int value;
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if (inferior_pid == 0)
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error ("There is no inferior process now.");
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/* A Sun 3/50 or 3/60 (at least) running SunOS 4.0.3 will have a
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kernel panic if we try to write past the end of the user area.
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Presumably Sun will fix this bug (it has been reported), but it
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is tacky to crash the system, so at least on SunOS4 we need to
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stop writing when we hit the end of the user area. */
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for (i = 0; i < sizeof (struct user); i += 2)
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{
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QUIT;
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errno = 0;
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value = call_ptrace (3, inferior_pid, i, 0);
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call_ptrace (6, inferior_pid, i, value);
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if (errno == 0)
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{
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printf (" Succeeded with address 0x%x; value 0x%x (%d).\n",
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i, value, value);
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}
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else if ((i & 0377) == 0)
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printf (" Failed at 0x%x.\n", i);
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}
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}
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#endif
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void
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_initialize_inflow ()
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{
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add_info ("terminal", term_info,
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"Print inferior's saved terminal status.");
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#if 0
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add_com ("try-writing-regs", class_obscure, try_writing_regs_command,
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"Try writing all locations in inferior's system block.\n\
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Report which ones can be written.");
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#endif
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add_com ("kill", class_run, kill_command,
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"Kill execution of program being debugged.");
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inferior_pid = 0;
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ioctl (0, TIOCGETP, &sg_ours);
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fcntl (0, F_GETFL, tflags_ours);
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#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
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ioctl (0, TIOCGETC, &tc_ours);
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#endif
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#ifdef TIOCGLTC
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ioctl (0, TIOCGLTC, <c_ours);
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#endif
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#ifdef TIOCLGET
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ioctl (0, TIOCLGET, &lmode_ours);
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#endif
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#ifdef TIOCGPGRP
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ioctl (0, TIOCGPGRP, &pgrp_ours);
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#endif /* TIOCGPGRP */
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terminal_is_ours = 1;
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}
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