/* Low level interface to ptrace, for GDB when running under Unix.
- Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
This file is part of GDB.
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-#include <stdio.h>
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "command.h"
#include "signals.h"
-#include "terminal.h"
+#include "serial.h"
#include "target.h"
#ifdef USG
#include <fcntl.h>
#include <sys/param.h>
-#include <sys/dir.h>
#include <signal.h>
-extern struct target_ops child_ops;
+static void
+kill_command PARAMS ((char *, int));
+
+static void
+terminal_ours_1 PARAMS ((int));
/* Nonzero if we are debugging an attached outside process
rather than an inferior. */
\f
/* Record terminal status separately for debugger and inferior. */
-static TERMINAL sg_inferior;
-static TERMINAL sg_ours;
+static serial_t stdin_serial;
-static int tflags_inferior;
-static int tflags_ours;
+/* TTY state for the inferior. We save it whenever the inferior stops, and
+ restore it when it resumes. */
+static serial_ttystate inferior_ttystate;
-#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
-static struct tchars tc_inferior;
-static struct tchars tc_ours;
-#endif
+/* 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;
-#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
+/* fcntl flags for us and the inferior. Saved and restored just like
+ {our,inferior}_ttystate. */
+static int tflags_inferior;
+static int tflags_ours;
-#ifdef TIOCGPGRP
-# ifdef SHORT_PGRP
-static short pgrp_inferior;
-static short pgrp_ours;
-# else
-static int pgrp_inferior;
-static int pgrp_ours;
-# endif
-#else
+/* 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) ();
-#endif /* TIOCGPGRP */
-/* Copy of inferior_io_terminal when inferior was last started. */
+/* 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;
-static void terminal_ours_1 ();
+/* Nonzero if our terminal settings are in effect. Zero if the
+ inferior's settings are in effect. Ignored if !gdb_has_a_terminal
+ (). */
-/* 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. */
+enum {yes, no, have_not_checked} gdb_has_a_terminal_flag = have_not_checked;
-void
-terminal_init_inferior ()
+/* Does GDB have a terminal (on stdin)? */
+int
+gdb_has_a_terminal ()
{
- sg_inferior = sg_ours;
- tflags_inferior = tflags_ours;
-
-#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
- tc_inferior = tc_ours;
+ 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
-#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
- ltc_inferior = ltc_ours;
-#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 TIOCLGET
- lmode_inferior = lmode_ours;
-#endif
+ return gdb_has_a_terminal_flag == yes;
+ }
+}
-#ifdef TIOCGPGRP
- pgrp_inferior = inferior_pid;
-#endif /* TIOCGPGRP */
+/* Macro for printing errors from ioctl operations */
- terminal_is_ours = 1;
+#define OOPSY(what) \
+ if (result == -1) \
+ fprintf(stderr, "[%s failed in terminal_inferior: %s]\n", \
+ what, strerror (errno))
+
+static void terminal_ours_1 PARAMS ((int));
+
+/* Initialize the terminal settings we record for the inferior,
+ before we actually run the inferior. */
+
+void
+terminal_init_inferior ()
+{
+ 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);
+ SERIAL_SET_PROCESS_GROUP (stdin_serial, inferior_ttystate, inferior_pid);
+
+ /* 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;
+ }
}
/* Put the inferior's terminal settings into effect.
void
terminal_inferior ()
{
- if (terminal_is_ours && inferior_thisrun_terminal == 0)
+ if (gdb_has_a_terminal () && 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);
+ 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
-#ifdef TIOCGPGRP
- ioctl (0, TIOCSPGRP, &pgrp_inferior);
-#else
- sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN);
- sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN);
-#endif /* TIOCGPGRP */
+ /* 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);
+
+ /* 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 terminal state, but ignore errors
+ (which will occur, in tcsetpgrp, if we are not sharing a
+ terminal). */
+
+ if (!attach_flag)
+ OOPSY ("setting tty state");
+
+ if (!job_control)
+ {
+ sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN);
+ sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN);
+ }
}
terminal_is_ours = 0;
}
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;
{
-#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
+ /* 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)
+ 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 TIOCGPGRP
- osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN);
+#ifdef SIGTTOU
+ if (job_control)
+ osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN);
+#endif
- ioctl (0, TIOCGPGRP, &pgrp_inferior);
- ioctl (0, TIOCSPGRP, &pgrp_ours);
+ if (inferior_ttystate)
+ free (inferior_ttystate);
+ inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial);
+
+ /* 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. */
+
+ /* 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);
+
+#ifdef SIGTTOU
+ if (job_control)
+ signal (SIGTTOU, osigttou);
+#endif
- signal (SIGTTOU, osigttou);
-#else
- signal (SIGINT, sigint_ours);
- signal (SIGQUIT, sigquit_ours);
-#endif /* TIOCGPGRP */
+ if (!job_control)
+ {
+ signal (SIGINT, sigint_ours);
+ signal (SIGQUIT, sigquit_ours);
+ }
+#ifdef F_GETFL
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);
+ /* 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;
- 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 */
+ result = result; /* lint */
+ }
}
/* ARGSUSED */
char *args;
int from_tty;
{
- register int i;
+ 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");
-#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");
+ /* First the fcntl flags. */
+ {
+ int flags;
+
+ flags = tflags_inferior;
-#else /* not HAVE_TERMIO */
+ printf_filtered ("File descriptor flags = ");
- printf_filtered ("fcntl flags = 0x%x, sgttyb.sg_flags = 0x%x, owner pid = %d.\n",
- tflags_inferior, sg_inferior.sg_flags, pgrp_inferior);
+#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
-#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 ", ((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 ", ((char *)<c_inferior)[i]);
- printf_filtered ("\n");
-#endif
-
-#ifdef TIOCLGET
- printf_filtered ("lmode: 0x%x\n", lmode_inferior);
-#endif
+ if (flags)
+ printf_filtered (" | 0x%x", flags);
+ printf_filtered ("\n");
+ }
+
+ SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_ttystate);
}
\f
/* NEW_TTY_PREFORK is called before forking a new child process,
if (inferior_thisrun_terminal == 0)
return;
-
+#if !defined(__GO32__)
#ifdef TIOCNOTTY
- /* Disconnect the child process from our controlling terminal. */
+ /* 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
{ close (2); dup (tty); }
if (tty > 2)
close(tty);
+#endif /* !go32 */
}
\f
/* Kill the inferior process. Make us have no inferior. */
char *arg;
int from_tty;
{
+ /* Shouldn't this be target_has_execution? FIXME. */
if (inferior_pid == 0)
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 ();
/* Killing off the inferior can leave us with a core file. If so,
print the state we are left in. */
{
inferior_pid = 0;
attach_flag = 0;
- mark_breakpoints_out ();
+ breakpoint_init_inferior ();
registers_changed ();
#ifdef 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);
- }
+ reinit_frame_cache ();
+
/* 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 ();
-}
\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). */
+/* Call set_sigint_trap when you need to pass a signal on to an attached
+ process when handling SIGINT */
+
/* ARGSUSED */
static void
-try_writing_regs_command (arg, from_tty)
- char *arg;
- int from_tty;
+pass_signal (signo)
+ int signo;
{
- register int i;
- register int value;
+ kill (inferior_pid, SIGINT);
+}
- 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);
- }
+static void (*osig)();
+
+void
+set_sigint_trap()
+{
+ osig = (void (*) ()) signal (SIGINT, pass_signal);
+}
+
+void
+clear_sigint_trap()
+{
+ signal (SIGINT, osig);
}
-#endif
\f
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;
}
-
projects / deliverable / binutils-gdb.git / blobdiff