/*- * This code is derived from software copyrighted by the Free Software * Foundation. * * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. * Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory. */ #ifndef lint static char sccsid[] = "@(#)inflow.c 6.5 (Berkeley) 5/8/91"; #endif /* not lint */ /* Low level interface to ptrace, for GDB when running under Unix. Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. This file is part of GDB. GDB 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 1, or (at your option) any later version. GDB 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 GDB; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include "defs.h" #include "param.h" #include "frame.h" #include "inferior.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 #ifdef HAVE_TERMIO #include #undef TIOCGETP #define TIOCGETP TCGETA #undef TIOCSETN #define TIOCSETN TCSETA #undef TIOCSETP #define TIOCSETP TCSETAF #define TERMINAL struct termio #else #include #include #include #define TERMINAL struct sgttyb #endif #ifdef SET_STACK_LIMIT_HUGE #include #include extern int original_stack_limit; #endif /* SET_STACK_LIMIT_HUGE */ extern int errno; /* 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 #ifdef TIOCGLTC static struct ltchars ltc_inferior; static struct ltchars ltc_ours; #endif #ifdef TIOCLGET static int lmode_inferior; static int lmode_ours; #endif #ifdef TIOCGPGRP static int pgrp_inferior; static int pgrp_ours; #else static int (*sigint_ours) (); static int (*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 () { if (remote_debugging) return; sg_inferior = sg_ours; tflags_inferior = tflags_ours; #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) tc_inferior = tc_ours; #endif #ifdef TIOCGLTC 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 (remote_debugging) return; 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 #ifdef TIOCGLTC ioctl (0, TIOCSLTC, <c_inferior); #endif #ifdef TIOCLGET ioctl (0, TIOCLSET, &lmode_inferior); #endif #ifdef TIOCGPGRP ioctl (0, TIOCSPGRP, &pgrp_inferior); #else sigint_ours = (int (*) ()) signal (SIGINT, SIG_IGN); sigquit_ours = (int (*) ()) 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 () { if (remote_debugging) return; 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 () { if (remote_debugging) return; 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 */ if (!terminal_is_ours) /* && inferior_thisrun_terminal == 0) */ { terminal_is_ours = 1; #ifdef TIOCGPGRP osigttou = 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 #ifdef TIOCGLTC 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 #ifdef TIOCGLTC 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 */ } static void term_status_command () { register int i; if (remote_debugging) { printf_filtered ("No terminal status when remote debugging.\n"); return; } 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 < sizeof (struct tchars); i++) printf_filtered ("0x%x ", ((char *)&tc_inferior)[i]); printf_filtered ("\n"); #endif #ifdef TIOCGLTC printf_filtered ("ltchars: "); for (i = 0; i < sizeof (struct ltchars); i++) printf_filtered ("0x%x ", ((char *)<c_inferior)[i]); printf_filtered ("\n"); ioctl (0, TIOCSLTC, <c_ours); #endif #ifdef TIOCLGET printf_filtered ("lmode: %x\n", lmode_inferior); #endif } static void new_tty (ttyname) char *ttyname; { register int tty; register int fd; #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. */ tty = open(ttyname, O_RDWR); if (tty == -1) _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); } /* Start an inferior process and returns its pid. ALLARGS is a string containing shell command to run the program. ENV is the environment vector to pass. */ #ifndef SHELL_FILE #define SHELL_FILE "/bin/sh" #endif int create_inferior (allargs, env) char *allargs; char **env; { int pid; char *shell_command; extern int sys_nerr; extern char *sys_errlist[]; extern int errno; /* If desired, concat something onto the front of ALLARGS. SHELL_COMMAND is the result. */ #ifdef SHELL_COMMAND_CONCAT shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + strlen (allargs) + 1); strcpy (shell_command, SHELL_COMMAND_CONCAT); strcat (shell_command, allargs); #else shell_command = allargs; #endif /* exec is said to fail if the executable is open. */ close_exec_file (); #if defined(USG) && !defined(HAVE_VFORK) pid = fork (); #else pid = vfork (); #endif if (pid < 0) perror_with_name ("vfork"); if (pid == 0) { #ifdef TIOCGPGRP /* Run inferior in a separate process group. */ setpgrp (getpid (), getpid ()); #endif /* TIOCGPGRP */ #ifdef SET_STACK_LIMIT_HUGE /* Reset the stack limit back to what it was. */ { struct rlimit rlim; getrlimit (RLIMIT_STACK, &rlim); rlim.rlim_cur = original_stack_limit; setrlimit (RLIMIT_STACK, &rlim); } #endif /* SET_STACK_LIMIT_HUGE */ inferior_thisrun_terminal = inferior_io_terminal; if (inferior_io_terminal != 0) new_tty (inferior_io_terminal); /* It seems that changing the signal handlers for the inferior after a vfork also changes them for the superior. See comments in initialize_signals for how we get the right signal handlers for the inferior. */ /* Not needed on Sun, at least, and loses there because it clobbers the superior. */ /*??? signal (SIGQUIT, SIG_DFL); signal (SIGINT, SIG_DFL); */ call_ptrace (0); execle (SHELL_FILE, "sh", "-c", shell_command, 0, env); fprintf (stderr, "Cannot exec %s: %s.\n", SHELL_FILE, errno < sys_nerr ? sys_errlist[errno] : "unknown error"); fflush (stderr); _exit (0177); } #ifdef TIOCGPGRP /* Avoid race with TIOCSPGRP: guarantee that inferior's pgrp exists. */ setpgrp (pid, pid); #endif /* TIOCGPGRP */ #ifdef CREATE_INFERIOR_HOOK CREATE_INFERIOR_HOOK (pid); #endif return pid; } /* Kill the inferior process. Make us have no inferior. */ static void kill_command () { if (remote_debugging) { inferior_pid = 0; return; } if (inferior_pid == 0) error ("The program is not being run."); if (!query ("Kill the inferior process? ")) error ("Not confirmed."); kill_inferior (); } void inferior_died () { inferior_pid = 0; attach_flag = 0; mark_breakpoints_out (); select_frame ((FRAME) 0, -1); reopen_exec_file (); if (have_core_file_p ()) set_current_frame ( create_new_frame (read_register (FP_REGNUM), read_pc ())); else set_current_frame (0); } #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). */ static void try_writing_regs_command () { register int i; register int value; extern int errno; 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_com ("term-status", class_obscure, term_status_command, "Print info on 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 #ifdef TIOCGLTC 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; }