/* Low level interface to ptrace, for GDB when running under Unix.
Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
- 2009 Free Software Foundation, Inc.
+ 2009, 2010 Free Software Foundation, Inc.
This file is part of GDB.
#include "terminal.h"
#include "target.h"
#include "gdbthread.h"
+#include "observer.h"
#include "gdb_string.h"
#include <signal.h>
#define O_NOCTTY 0
#endif
-#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
-static void handle_sigio (int);
-#endif
-
extern void _initialize_inflow (void);
static void pass_signal (int);
-static void kill_command (char *, int);
-
static void terminal_ours_1 (int);
\f
/* Record terminal status separately for debugger and inferior. */
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;
+/* Terminal related info we need to keep track of. Each inferior
+ holds an instance of this structure --- we save it whenever the
+ corresponding inferior stops, and restore it to the foreground
+ inferior when it resumes. */
+struct terminal_info
+{
+ /* The name of the tty (from the `tty' command) that we gave to the
+ inferior when it was started. */
+ char *run_terminal;
-/* 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;
+ /* TTY state. We save it whenever the inferior stops, and restore
+ it when it resumes. */
+ serial_ttystate ttystate;
+
+#ifdef PROCESS_GROUP_TYPE
+ /* Process group. Saved and restored just like ttystate. */
+ PROCESS_GROUP_TYPE process_group;
+#endif
-/* fcntl flags for us and the inferior. Saved and restored just like
- {our,inferior}_ttystate. */
-static int tflags_inferior;
-static int tflags_ours;
+ /* fcntl flags. Saved and restored just like ttystate. */
+ int tflags;
+};
+
+/* Our own tty state, which we restore every time we need to deal with
+ the terminal. This is only set once, when GDB first starts. The
+ settings of flags which readline saves and restores and
+ unimportant. */
+static struct terminal_info our_terminal_info;
+
+static struct terminal_info *get_inflow_inferior_data (struct inferior *);
#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;
+
+/* Return the process group of the current inferior. */
+
+PROCESS_GROUP_TYPE
+inferior_process_group (void)
+{
+ return get_inflow_inferior_data (current_inferior ())->process_group;
+}
#endif
/* While the inferior is running, we want SIGINT and SIGQUIT to go to the
static void (*sigint_ours) ();
static void (*sigquit_ours) ();
-/* The name of the tty (from the `tty' command) that we gave to the inferior
- when it was last started. */
-
+/* The name of the tty (from the `tty' command) that we're giving to
+ the inferior when starting it up. This is only (and should only
+ be) used as a transient global by new_tty_prefork,
+ create_tty_session, new_tty and new_tty_postfork, all called from
+ fork_inferior, while forking a new child. */
static const char *inferior_thisrun_terminal;
/* Nonzero if our terminal settings are in effect. Zero if the
gdb_getpgrp (void)
{
int process_group = -1;
+
#ifdef HAVE_TERMIOS
process_group = tcgetpgrp (0);
#endif
initialized. */
#ifdef F_GETFL
- tflags_ours = fcntl (0, F_GETFL, 0);
+ our_terminal_info.tflags = fcntl (0, F_GETFL, 0);
#endif
gdb_has_a_terminal_flag = no;
if (stdin_serial != NULL)
{
- our_ttystate = serial_get_tty_state (stdin_serial);
+ our_terminal_info.ttystate = serial_get_tty_state (stdin_serial);
- if (our_ttystate != NULL)
+ if (our_terminal_info.ttystate != NULL)
{
gdb_has_a_terminal_flag = yes;
#ifdef PROCESS_GROUP_TYPE
- our_process_group = gdb_getpgrp ();
+ our_terminal_info.process_group = gdb_getpgrp ();
#endif
}
}
{
if (gdb_has_a_terminal ())
{
+ struct inferior *inf = current_inferior ();
+ struct terminal_info *tinfo = get_inflow_inferior_data (inf);
+
/* 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);
+ xfree (tinfo->ttystate);
+ tinfo->ttystate = serial_get_tty_state (stdin_serial);
#ifdef PROCESS_GROUP_TYPE
- inferior_process_group = pgrp;
+ tinfo->process_group = pgrp;
#endif
/* Make sure that next time we call terminal_inferior (which will be
{
/* 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);
+ xfree (our_terminal_info.ttystate);
+ our_terminal_info.ttystate = serial_get_tty_state (stdin_serial);
}
}
void
terminal_inferior (void)
{
- if (gdb_has_a_terminal () && terminal_is_ours
- && inferior_ttystate != NULL
- && inferior_thisrun_terminal == 0)
+ struct inferior *inf;
+ struct terminal_info *tinfo;
+
+ if (!terminal_is_ours)
+ return;
+
+ inf = current_inferior ();
+ tinfo = get_inflow_inferior_data (inf);
+
+ if (gdb_has_a_terminal ()
+ && tinfo->ttystate != NULL
+ && tinfo->run_terminal == NULL)
{
int result;
/* 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);
+ result = fcntl (0, F_SETFL, tinfo->tflags);
+ result = fcntl (0, F_SETFL, tinfo->tflags);
OOPSY ("fcntl F_SETFL");
#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);
+ result = serial_set_tty_state (stdin_serial,
+ tinfo->ttystate);
OOPSY ("setting tty state");
if (!job_control)
if (job_control)
{
- struct inferior *inf = current_inferior ();
#ifdef HAVE_TERMIOS
- result = tcsetpgrp (0, inferior_process_group);
+ result = tcsetpgrp (0, tinfo->process_group);
if (!inf->attach_flag)
OOPSY ("tcsetpgrp");
#endif
#ifdef HAVE_SGTTY
- result = ioctl (0, TIOCSPGRP, &inferior_process_group);
+ result = ioctl (0, TIOCSPGRP, &tinfo->process_group);
if (!inf->attach_flag)
OOPSY ("TIOCSPGRP");
#endif
static void
terminal_ours_1 (int output_only)
{
- /* Checking inferior_thisrun_terminal is necessary so that
+ struct inferior *inf;
+ struct terminal_info *tinfo;
+
+ if (terminal_is_ours)
+ return;
+
+ terminal_is_ours = 1;
+
+ /* Checking inferior->run_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)
+
+ inf = current_inferior ();
+ tinfo = get_inflow_inferior_data (inf);
+
+ if (tinfo->run_terminal != NULL || gdb_has_a_terminal () == 0)
return;
- if (!terminal_is_ours)
{
- struct inferior *inf = current_inferior ();
-
#ifdef SIGTTOU
/* Ignore this signal since it will happen when we try to set the
pgrp. */
#endif
int result;
- terminal_is_ours = 1;
-
#ifdef SIGTTOU
if (job_control)
osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
#endif
- if (inferior_ttystate)
- xfree (inferior_ttystate);
- inferior_ttystate = serial_get_tty_state (stdin_serial);
+ xfree (tinfo->ttystate);
+ tinfo->ttystate = serial_get_tty_state (stdin_serial);
#ifdef PROCESS_GROUP_TYPE
if (!inf->attach_flag)
/* If setpgrp failed in terminal_inferior, this would give us
our process group instead of the inferior's. See
terminal_inferior for details. */
- inferior_process_group = gdb_getpgrp ();
+ tinfo->process_group = gdb_getpgrp ();
#endif
/* Here we used to set ICANON in our ttystate, but I believe this
though, since readline will deal with raw mode when/if it needs to.
*/
- serial_noflush_set_tty_state (stdin_serial, our_ttystate,
- inferior_ttystate);
+ serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate,
+ tinfo->ttystate);
if (job_control)
{
#ifdef HAVE_TERMIOS
- result = tcsetpgrp (0, our_process_group);
+ result = tcsetpgrp (0, our_terminal_info.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
#endif /* termios */
#ifdef HAVE_SGTTY
- result = ioctl (0, TIOCSPGRP, &our_process_group);
+ result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group);
#endif
}
}
#ifdef F_GETFL
- tflags_inferior = fcntl (0, F_GETFL, 0);
+ tinfo->tflags = fcntl (0, F_GETFL, 0);
/* 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);
+ result = fcntl (0, F_SETFL, our_terminal_info.tflags);
+ result = fcntl (0, F_SETFL, our_terminal_info.tflags);
#endif
}
}
+/* Per-inferior data key. */
+static const struct inferior_data *inflow_inferior_data;
+
+static void
+inflow_inferior_data_cleanup (struct inferior *inf, void *arg)
+{
+ struct terminal_info *info;
+
+ info = inferior_data (inf, inflow_inferior_data);
+ if (info != NULL)
+ {
+ xfree (info->run_terminal);
+ xfree (info);
+ }
+}
+
+/* Get the current svr4 data. If none is found yet, add it now. This
+ function always returns a valid object. */
+
+static struct terminal_info *
+get_inflow_inferior_data (struct inferior *inf)
+{
+ struct terminal_info *info;
+
+ info = inferior_data (inf, inflow_inferior_data);
+ if (info == NULL)
+ {
+ info = XZALLOC (struct terminal_info);
+ set_inferior_data (inf, inflow_inferior_data, info);
+ }
+
+ return info;
+}
+
+/* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member
+ of the inferior structure. This field is private to inflow.c, and
+ its type is opaque to the rest of GDB. PID is the target pid of
+ the inferior that is about to be removed from the inferior
+ list. */
+
+static void
+inflow_inferior_exit (struct inferior *inf)
+{
+ struct terminal_info *info;
+
+ info = inferior_data (inf, inflow_inferior_data);
+ if (info != NULL)
+ {
+ xfree (info->run_terminal);
+ xfree (info);
+ set_inferior_data (inf, inflow_inferior_data, NULL);
+ }
+}
+
+void
+copy_terminal_info (struct inferior *to, struct inferior *from)
+{
+ struct terminal_info *tinfo_to, *tinfo_from;
+
+ tinfo_to = get_inflow_inferior_data (to);
+ tinfo_from = get_inflow_inferior_data (from);
+ *tinfo_to = *tinfo_from;
+ if (tinfo_from->run_terminal)
+ tinfo_to->run_terminal
+ = xstrdup (tinfo_from->run_terminal);
+}
+
void
term_info (char *arg, int from_tty)
{
void
child_terminal_info (char *args, int from_tty)
{
+ struct inferior *inf;
+ struct terminal_info *tinfo;
+
if (!gdb_has_a_terminal ())
{
printf_filtered (_("This GDB does not control a terminal.\n"));
return;
}
+ if (ptid_equal (inferior_ptid, null_ptid))
+ return;
+
+ inf = current_inferior ();
+ tinfo = get_inflow_inferior_data (inf);
+
printf_filtered (_("Inferior's terminal status (currently saved by GDB):\n"));
/* First the fcntl flags. */
{
int flags;
- flags = tflags_inferior;
+ flags = tinfo->tflags;
printf_filtered ("File descriptor flags = ");
}
#ifdef PROCESS_GROUP_TYPE
- printf_filtered ("Process group = %d\n",
- (int) inferior_process_group);
+ printf_filtered ("Process group = %d\n", (int) tinfo->process_group);
#endif
- serial_print_tty_state (stdin_serial, inferior_ttystate, gdb_stdout);
+ serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout);
}
\f
/* NEW_TTY_PREFORK is called before forking a new child process,
inferior_thisrun_terminal = ttyname;
}
+#if !defined(__GO32__) && !defined(_WIN32)
+/* If RESULT, assumed to be the return value from a system call, is
+ negative, print the error message indicated by errno and exit.
+ MSG should identify the operation that failed. */
+static void
+check_syscall (const char *msg, int result)
+{
+ if (result < 0)
+ {
+ print_sys_errmsg (msg, errno);
+ _exit (1);
+ }
+}
+#endif
+
void
new_tty (void)
{
/* Now open the specified new terminal. */
tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY);
- if (tty == -1)
- {
- print_sys_errmsg (inferior_thisrun_terminal, errno);
- _exit (1);
- }
+ check_syscall (inferior_thisrun_terminal, tty);
/* Avoid use of dup2; doesn't exist on all systems. */
if (tty != 0)
{
close (0);
- dup (tty);
+ check_syscall ("dup'ing tty into fd 0", dup (tty));
}
if (tty != 1)
{
close (1);
- dup (tty);
+ check_syscall ("dup'ing tty into fd 1", dup (tty));
}
if (tty != 2)
{
close (2);
- dup (tty);
+ check_syscall ("dup'ing tty into fd 2", dup (tty));
}
#ifdef TIOCSCTTY
close (tty);
#endif /* !go32 && !win32 */
}
-\f
-/* Kill the inferior process. Make us have no inferior. */
-static void
-kill_command (char *arg, int from_tty)
+/* NEW_TTY_POSTFORK is called after forking a new child process, and
+ adding it to the inferior table, to store the TTYNAME being used by
+ the child, or null if it sharing the terminal with gdb. */
+
+void
+new_tty_postfork (void)
{
- /* 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! */
+ /* Save the name for later, for determining whether we and the child
+ are sharing a tty. */
- if (ptid_equal (inferior_ptid, null_ptid))
- error (_("The program is not being run."));
- if (!query ("Kill the program being debugged? "))
- error (_("Not confirmed."));
- target_kill ();
-
- /* If the current target interface claims there's still execution,
- then don't mess with threads of other processes. */
- if (!target_has_execution)
+ if (inferior_thisrun_terminal)
{
- init_thread_list (); /* Destroy thread info */
+ struct inferior *inf = current_inferior ();
+ struct terminal_info *tinfo = get_inflow_inferior_data (inf);
- /* 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"), target_longname);
- print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
- }
+ tinfo->run_terminal = xstrdup (inferior_thisrun_terminal);
}
- bfd_cache_close_all ();
+
+ inferior_thisrun_terminal = NULL;
}
+
\f
/* Call set_sigint_trap when you need to pass a signal on to an attached
process when handling SIGINT */
}
static void (*osig) ();
+static int osig_set;
void
set_sigint_trap (void)
{
struct inferior *inf = current_inferior ();
- if (inf->attach_flag || inferior_thisrun_terminal)
+ struct terminal_info *tinfo = get_inflow_inferior_data (inf);
+
+ if (inf->attach_flag || tinfo->run_terminal)
{
osig = (void (*)()) signal (SIGINT, pass_signal);
+ osig_set = 1;
}
+ else
+ osig_set = 0;
}
void
clear_sigint_trap (void)
{
- struct inferior *inf = current_inferior ();
- if (inf->attach_flag || inferior_thisrun_terminal)
+ if (osig_set)
{
signal (SIGINT, osig);
+ osig_set = 0;
}
}
\f
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_ptid = null_ptid;
-
terminal_is_ours = 1;
/* OK, figure out whether we have job control. If neither termios nor
job_control = 0;
#endif /* TIOCGPGRP */
#endif /* sgtty */
+
+ observer_attach_inferior_exit (inflow_inferior_exit);
+
+ inflow_inferior_data
+ = register_inferior_data_with_cleanup (inflow_inferior_data_cleanup);
}
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