/* Low level interface to ptrace, for GDB when running under Unix. Copyright (C) 1986, 1987, 1989, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include "defs.h" #include "frame.h" #include "inferior.h" #include "command.h" #include "signals.h" #include "terminal.h" #include "target.h" #ifdef USG #include #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 #include #include #include extern struct target_ops child_ops; /* Nonzero if we are debugging an attached outside process rather than an inferior. */ int attach_flag; /* Record terminal status separately for debugger and inferior. */ static TERMINAL sg_inferior; static TERMINAL sg_ours; 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; #endif #ifdef TIOCLGET static int lmode_inferior; static int lmode_ours; #endif #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 */ /* Copy of inferior_io_terminal when inferior was last started. */ static char *inferior_thisrun_terminal; static void terminal_ours_1 (); /* Nonzero if our terminal settings are in effect. Zero if the inferior's settings are in effect. */ static int terminal_is_ours; /* Initialize the terminal settings we record for the inferior, before we actually run the inferior. */ void terminal_init_inferior () { sg_inferior = sg_ours; tflags_inferior = tflags_ours; #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) tc_inferior = tc_ours; #endif #if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN) ltc_inferior = ltc_ours; #endif #ifdef TIOCLGET lmode_inferior = lmode_ours; #endif #ifdef TIOCGPGRP pgrp_inferior = inferior_pid; #endif /* TIOCGPGRP */ terminal_is_ours = 1; } /* Put the inferior's terminal settings into effect. This is preparation for starting or resuming the inferior. */ void terminal_inferior () { if (terminal_is_ours && inferior_thisrun_terminal == 0) { fcntl (0, F_SETFL, tflags_inferior); fcntl (0, F_SETFL, tflags_inferior); ioctl (0, TIOCSETN, &sg_inferior); #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) ioctl (0, TIOCSETC, &tc_inferior); #endif #if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN) ioctl (0, TIOCSLTC, <c_inferior); #endif #ifdef TIOCLGET ioctl (0, TIOCLSET, &lmode_inferior); #endif #ifdef TIOCGPGRP ioctl (0, TIOCSPGRP, &pgrp_inferior); #else sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN); sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN); #endif /* TIOCGPGRP */ } 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); } static void terminal_ours_1 (output_only) int output_only; { #ifdef TIOCGPGRP /* Ignore this signal since it will happen when we try to set the pgrp. */ void (*osigttou) (); #endif /* TIOCGPGRP */ /* The check for inferior_thisrun_terminal had been commented out when the call to ioctl (TIOCNOTTY) was commented out. 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. */ if (inferior_thisrun_terminal != 0) return; if (!terminal_is_ours) { terminal_is_ours = 1; #ifdef TIOCGPGRP osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN); ioctl (0, TIOCGPGRP, &pgrp_inferior); ioctl (0, TIOCSPGRP, &pgrp_ours); signal (SIGTTOU, osigttou); #else signal (SIGINT, sigint_ours); signal (SIGQUIT, sigquit_ours); #endif /* TIOCGPGRP */ tflags_inferior = fcntl (0, F_GETFL, 0); ioctl (0, TIOCGETP, &sg_inferior); #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) ioctl (0, TIOCGETC, &tc_inferior); #endif #if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN) ioctl (0, TIOCGLTC, <c_inferior); #endif #ifdef TIOCLGET ioctl (0, TIOCLGET, &lmode_inferior); #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 */ fcntl (0, F_SETFL, tflags_ours); fcntl (0, F_SETFL, tflags_ours); ioctl (0, TIOCSETN, &sg_ours); #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) ioctl (0, TIOCSETC, &tc_ours); #endif #if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN) ioctl (0, TIOCSLTC, <c_ours); #endif #ifdef TIOCLGET ioctl (0, TIOCLSET, &lmode_ours); #endif #ifdef HAVE_TERMIO sg_ours.c_lflag |= ICANON; #else /* not HAVE_TERMIO */ sg_ours.sg_flags &= ~RAW & ~CBREAK; #endif /* not HAVE_TERMIO */ } /* 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; { register int i; printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); #ifdef HAVE_TERMIO printf_filtered ("fcntl flags = 0x%x, c_iflag = 0x%x, c_oflag = 0x%x,\n", tflags_inferior, 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"); #else /* not HAVE_TERMIO */ printf_filtered ("fcntl flags = 0x%x, sgttyb.sg_flags = 0x%x, owner pid = %d.\n", tflags_inferior, sg_inferior.sg_flags, pgrp_inferior); #endif /* not HAVE_TERMIO */ #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) printf_filtered ("tchars: "); for (i = 0; i < (int)sizeof (struct tchars); i++) printf_filtered ("0x%x ", ((char *)&tc_inferior)[i]); printf_filtered ("\n"); #endif #if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN) printf_filtered ("ltchars: "); for (i = 0; i < (int)sizeof (struct ltchars); i++) printf_filtered ("0x%x ", ((char *)<c_inferior)[i]); printf_filtered ("\n"); #endif #ifdef TIOCLGET printf_filtered ("lmode: 0x%x\n", lmode_inferior); #endif } /* 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; #ifdef TIOCNOTTY /* Disconnect the child process from our controlling terminal. */ tty = open("/dev/tty", O_RDWR); if (tty > 0) { ioctl(tty, TIOCNOTTY, 0); close(tty); } #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); } /* Kill the inferior process. Make us have no inferior. */ /* ARGSUSED */ static void kill_command (arg, from_tty) char *arg; int from_tty; { if (inferior_pid == 0) error ("The program is not being run."); if (!query ("Kill the inferior process? ")) error ("Not confirmed."); target_kill (arg, from_tty); /* 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); } } /* The inferior process has died. Long live the inferior! */ void generic_mourn_inferior () { 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 (); } void child_mourn_inferior () { unpush_target (&child_ops); generic_mourn_inferior (); } #if 0 /* This function is just for testing, and on some systems (Sony NewsOS 3.2) also includes which leads to errors (since on this system at least sys/time.h is not protected against multiple inclusion). */ /* ARGSUSED */ static void try_writing_regs_command (arg, from_tty) char *arg; int from_tty; { 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) { 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); } } #endif void _initialize_inflow () { add_info ("terminal", term_info, "Print inferior's saved terminal status."); #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."); #endif add_com ("kill", class_run, kill_command, "Kill execution of program being debugged."); inferior_pid = 0; ioctl (0, TIOCGETP, &sg_ours); tflags_ours = fcntl (0, F_GETFL, 0); #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 #ifdef TIOCGPGRP ioctl (0, TIOCGPGRP, &pgrp_ours); #endif /* TIOCGPGRP */ terminal_is_ours = 1; }