[deliverable/binutils-gdb.git] / gdb / break-catch-sig.c

/* Everything about signal catchpoints, for GDB.

   Copyright (C) 2011-2015 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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "arch-utils.h"
#include <ctype.h>
#include "breakpoint.h"
#include "gdbcmd.h"
#include "inferior.h"
#include "infrun.h"
#include "annotate.h"
#include "valprint.h"
#include "cli/cli-utils.h"
#include "completer.h"
#include "gdb_obstack.h"

#define INTERNAL_SIGNAL(x) ((x) == GDB_SIGNAL_TRAP || (x) == GDB_SIGNAL_INT)

typedef enum gdb_signal gdb_signal_type;

DEF_VEC_I (gdb_signal_type);

/* An instance of this type is used to represent a signal catchpoint.
   It includes a "struct breakpoint" as a kind of base class; users
   downcast to "struct breakpoint *" when needed.  A breakpoint is
   really of this type iff its ops pointer points to
   SIGNAL_CATCHPOINT_OPS.  */

struct signal_catchpoint
{
  /* The base class.  */

  struct breakpoint base;

  /* Signal numbers used for the 'catch signal' feature.  If no signal
     has been specified for filtering, its value is NULL.  Otherwise,
     it holds a list of all signals to be caught.  */

  VEC (gdb_signal_type) *signals_to_be_caught;

  /* If SIGNALS_TO_BE_CAUGHT is NULL, then all "ordinary" signals are
     caught.  If CATCH_ALL is non-zero, then internal signals are
     caught as well.  If SIGNALS_TO_BE_CAUGHT is non-NULL, then this
     field is ignored.  */

  int catch_all;
};

/* The breakpoint_ops structure to be used in signal catchpoints.  */

static struct breakpoint_ops signal_catchpoint_ops;

/* Count of each signal.  */

static unsigned int *signal_catch_counts;

\f

/* A convenience wrapper for gdb_signal_to_name that returns the
   integer value if the name is not known.  */

static const char *
signal_to_name_or_int (enum gdb_signal sig)
{
  const char *result = gdb_signal_to_name (sig);

  if (strcmp (result, "?") == 0)
    result = plongest (sig);

  return result;
}

\f

/* Implement the "dtor" breakpoint_ops method for signal
   catchpoints.  */

static void
signal_catchpoint_dtor (struct breakpoint *b)
{
  struct signal_catchpoint *c = (struct signal_catchpoint *) b;

  VEC_free (gdb_signal_type, c->signals_to_be_caught);

  base_breakpoint_ops.dtor (b);
}

/* Implement the "insert_location" breakpoint_ops method for signal
   catchpoints.  */

static int
signal_catchpoint_insert_location (struct bp_location *bl)
{
  struct signal_catchpoint *c = (struct signal_catchpoint *) bl->owner;
  int i;

  if (c->signals_to_be_caught != NULL)
    {
      gdb_signal_type iter;

      for (i = 0;
	   VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	   i++)
	++signal_catch_counts[iter];
    }
  else
    {
      for (i = 0; i < GDB_SIGNAL_LAST; ++i)
	{
	  if (c->catch_all || !INTERNAL_SIGNAL (i))
	    ++signal_catch_counts[i];
	}
    }

  signal_catch_update (signal_catch_counts);

  return 0;
}

/* Implement the "remove_location" breakpoint_ops method for signal
   catchpoints.  */

static int
signal_catchpoint_remove_location (struct bp_location *bl)
{
  struct signal_catchpoint *c = (struct signal_catchpoint *) bl->owner;
  int i;

  if (c->signals_to_be_caught != NULL)
    {
      gdb_signal_type iter;

      for (i = 0;
	   VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	   i++)
	{
	  gdb_assert (signal_catch_counts[iter] > 0);
	  --signal_catch_counts[iter];
	}
    }
  else
    {
      for (i = 0; i < GDB_SIGNAL_LAST; ++i)
	{
	  if (c->catch_all || !INTERNAL_SIGNAL (i))
	    {
	      gdb_assert (signal_catch_counts[i] > 0);
	      --signal_catch_counts[i];
	    }
	}
    }

  signal_catch_update (signal_catch_counts);

  return 0;
}

/* Implement the "breakpoint_hit" breakpoint_ops method for signal
   catchpoints.  */

static int
signal_catchpoint_breakpoint_hit (const struct bp_location *bl,
				  struct address_space *aspace,
				  CORE_ADDR bp_addr,
				  const struct target_waitstatus *ws)
{
  const struct signal_catchpoint *c
    = (const struct signal_catchpoint *) bl->owner;
  gdb_signal_type signal_number;

  if (ws->kind != TARGET_WAITKIND_STOPPED)
    return 0;

  signal_number = ws->value.sig;

  /* If we are catching specific signals in this breakpoint, then we
     must guarantee that the called signal is the same signal we are
     catching.  */
  if (c->signals_to_be_caught)
    {
      int i;
      gdb_signal_type iter;

      for (i = 0;
           VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
           i++)
	if (signal_number == iter)
	  return 1;
      /* Not the same.  */
      gdb_assert (!iter);
      return 0;
    }
  else
    return c->catch_all || !INTERNAL_SIGNAL (signal_number);
}

/* Implement the "print_it" breakpoint_ops method for signal
   catchpoints.  */

static enum print_stop_action
signal_catchpoint_print_it (bpstat bs)
{
  struct breakpoint *b = bs->breakpoint_at;
  ptid_t ptid;
  struct target_waitstatus last;
  const char *signal_name;

  get_last_target_status (&ptid, &last);

  signal_name = signal_to_name_or_int (last.value.sig);

  annotate_catchpoint (b->number);

  printf_filtered (_("\nCatchpoint %d (signal %s), "), b->number, signal_name);

  return PRINT_SRC_AND_LOC;
}

/* Implement the "print_one" breakpoint_ops method for signal
   catchpoints.  */

static void
signal_catchpoint_print_one (struct breakpoint *b,
			     struct bp_location **last_loc)
{
  struct signal_catchpoint *c = (struct signal_catchpoint *) b;
  struct value_print_options opts;
  struct ui_out *uiout = current_uiout;

  get_user_print_options (&opts);

  /* Field 4, the address, is omitted (which makes the columns
     not line up too nicely with the headers, but the effect
     is relatively readable).  */
  if (opts.addressprint)
    ui_out_field_skip (uiout, "addr");
  annotate_field (5);

  if (c->signals_to_be_caught
      && VEC_length (gdb_signal_type, c->signals_to_be_caught) > 1)
    ui_out_text (uiout, "signals \"");
  else
    ui_out_text (uiout, "signal \"");

  if (c->signals_to_be_caught)
    {
      int i;
      gdb_signal_type iter;
      struct obstack text;
      struct cleanup *cleanup;

      obstack_init (&text);
      cleanup = make_cleanup_obstack_free (&text);

      for (i = 0;
           VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
           i++)
        {
	  const char *name = signal_to_name_or_int (iter);

	  if (i > 0)
	    obstack_grow (&text, " ", 1);
	  obstack_grow (&text, name, strlen (name));
        }
      obstack_grow (&text, "", 1);
      ui_out_field_string (uiout, "what", obstack_base (&text));
      do_cleanups (cleanup);
    }
  else
    ui_out_field_string (uiout, "what",
			 c->catch_all ? "<any signal>" : "<standard signals>");
  ui_out_text (uiout, "\" ");

  if (ui_out_is_mi_like_p (uiout))
    ui_out_field_string (uiout, "catch-type", "signal");
}

/* Implement the "print_mention" breakpoint_ops method for signal
   catchpoints.  */

static void
signal_catchpoint_print_mention (struct breakpoint *b)
{
  struct signal_catchpoint *c = (struct signal_catchpoint *) b;

  if (c->signals_to_be_caught)
    {
      int i;
      gdb_signal_type iter;

      if (VEC_length (gdb_signal_type, c->signals_to_be_caught) > 1)
        printf_filtered (_("Catchpoint %d (signals"), b->number);
      else
        printf_filtered (_("Catchpoint %d (signal"), b->number);

      for (i = 0;
           VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
           i++)
        {
	  const char *name = signal_to_name_or_int (iter);

	  printf_filtered (" %s", name);
        }
      printf_filtered (")");
    }
  else if (c->catch_all)
    printf_filtered (_("Catchpoint %d (any signal)"), b->number);
  else
    printf_filtered (_("Catchpoint %d (standard signals)"), b->number);
}

/* Implement the "print_recreate" breakpoint_ops method for signal
   catchpoints.  */

static void
signal_catchpoint_print_recreate (struct breakpoint *b, struct ui_file *fp)
{
  struct signal_catchpoint *c = (struct signal_catchpoint *) b;

  fprintf_unfiltered (fp, "catch signal");

  if (c->signals_to_be_caught)
    {
      int i;
      gdb_signal_type iter;

      for (i = 0;
           VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
           i++)
	fprintf_unfiltered (fp, " %s", signal_to_name_or_int (iter));
    }
  else if (c->catch_all)
    fprintf_unfiltered (fp, " all");
  fputc_unfiltered ('\n', fp);
}

/* Implement the "explains_signal" breakpoint_ops method for signal
   catchpoints.  */

static int
signal_catchpoint_explains_signal (struct breakpoint *b, enum gdb_signal sig)
{
  return 1;
}

/* Create a new signal catchpoint.  TEMPFLAG is true if this should be
   a temporary catchpoint.  FILTER is the list of signals to catch; it
   can be NULL, meaning all signals.  CATCH_ALL is a flag indicating
   whether signals used internally by gdb should be caught; it is only
   valid if FILTER is NULL.  If FILTER is NULL and CATCH_ALL is zero,
   then internal signals like SIGTRAP are not caught.  */

static void
create_signal_catchpoint (int tempflag, VEC (gdb_signal_type) *filter,
			  int catch_all)
{
  struct signal_catchpoint *c;
  struct gdbarch *gdbarch = get_current_arch ();

  c = XNEW (struct signal_catchpoint);
  init_catchpoint (&c->base, gdbarch, tempflag, NULL, &signal_catchpoint_ops);
  c->signals_to_be_caught = filter;
  c->catch_all = catch_all;

  install_breakpoint (0, &c->base, 1);
}


/* Splits the argument using space as delimiter.  Returns an xmalloc'd
   filter list, or NULL if no filtering is required.  */

static VEC (gdb_signal_type) *
catch_signal_split_args (char *arg, int *catch_all)
{
  VEC (gdb_signal_type) *result = NULL;
  struct cleanup *cleanup = make_cleanup (VEC_cleanup (gdb_signal_type),
					  &result);
  int first = 1;

  while (*arg != '\0')
    {
      int num;
      gdb_signal_type signal_number;
      char *one_arg, *endptr;
      struct cleanup *inner_cleanup;

      one_arg = extract_arg (&arg);
      if (one_arg == NULL)
	break;
      inner_cleanup = make_cleanup (xfree, one_arg);

      /* Check for the special flag "all".  */
      if (strcmp (one_arg, "all") == 0)
	{
	  arg = skip_spaces (arg);
	  if (*arg != '\0' || !first)
	    error (_("'all' cannot be caught with other signals"));
	  *catch_all = 1;
	  gdb_assert (result == NULL);
	  do_cleanups (inner_cleanup);
	  discard_cleanups (cleanup);
	  return NULL;
	}

      first = 0;

      /* Check if the user provided a signal name or a number.  */
      num = (int) strtol (one_arg, &endptr, 0);
      if (*endptr == '\0')
	signal_number = gdb_signal_from_command (num);
      else
	{
	  signal_number = gdb_signal_from_name (one_arg);
	  if (signal_number == GDB_SIGNAL_UNKNOWN)
	    error (_("Unknown signal name '%s'."), one_arg);
	}

      VEC_safe_push (gdb_signal_type, result, signal_number);
      do_cleanups (inner_cleanup);
    }

  discard_cleanups (cleanup);
  return result;
}

/* Implement the "catch signal" command.  */

static void
catch_signal_command (char *arg, int from_tty,
		      struct cmd_list_element *command)
{
  int tempflag, catch_all = 0;
  VEC (gdb_signal_type) *filter;

  tempflag = get_cmd_context (command) == CATCH_TEMPORARY;

  arg = skip_spaces (arg);

  /* The allowed syntax is:
     catch signal
     catch signal <name | number> [<name | number> ... <name | number>]

     Let's check if there's a signal name.  */

  if (arg != NULL)
    filter = catch_signal_split_args (arg, &catch_all);
  else
    filter = NULL;

  create_signal_catchpoint (tempflag, filter, catch_all);
}

static void
initialize_signal_catchpoint_ops (void)
{
  struct breakpoint_ops *ops;

  initialize_breakpoint_ops ();

  ops = &signal_catchpoint_ops;
  *ops = base_breakpoint_ops;
  ops->dtor = signal_catchpoint_dtor;
  ops->insert_location = signal_catchpoint_insert_location;
  ops->remove_location = signal_catchpoint_remove_location;
  ops->breakpoint_hit = signal_catchpoint_breakpoint_hit;
  ops->print_it = signal_catchpoint_print_it;
  ops->print_one = signal_catchpoint_print_one;
  ops->print_mention = signal_catchpoint_print_mention;
  ops->print_recreate = signal_catchpoint_print_recreate;
  ops->explains_signal = signal_catchpoint_explains_signal;
}

initialize_file_ftype _initialize_break_catch_sig;

void
_initialize_break_catch_sig (void)
{
  initialize_signal_catchpoint_ops ();

  signal_catch_counts = XCNEWVEC (unsigned int, GDB_SIGNAL_LAST);

  add_catch_command ("signal", _("\
Catch signals by their names and/or numbers.\n\
Usage: catch signal [[NAME|NUMBER] [NAME|NUMBER]...|all]\n\
Arguments say which signals to catch.  If no arguments\n\
are given, every \"normal\" signal will be caught.\n\
The argument \"all\" means to also catch signals used by GDB.\n\
Arguments, if given, should be one or more signal names\n\
(if your system supports that), or signal numbers."),
		     catch_signal_command,
		     signal_completer,
		     CATCH_PERMANENT,
		     CATCH_TEMPORARY);
}
Commit	Line	Data
ab04a2af TT	1	/* Everything about signal catchpoints, for GDB.
ab04a2af TT	2
32d0add0	3	Copyright (C) 2011-2015 Free Software Foundation, Inc.
ab04a2af TT	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
	20	#include "defs.h"
	21	#include "arch-utils.h"
	22	#include <ctype.h>
	23	#include "breakpoint.h"
	24	#include "gdbcmd.h"
	25	#include "inferior.h"
45741a9c	26	#include "infrun.h"
ab04a2af TT	27	#include "annotate.h"
	28	#include "valprint.h"
	29	#include "cli/cli-utils.h"
	30	#include "completer.h"
	31	#include "gdb_obstack.h"
	32
	33	#define INTERNAL_SIGNAL(x) ((x) == GDB_SIGNAL_TRAP \|\| (x) == GDB_SIGNAL_INT)
	34
	35	typedef enum gdb_signal gdb_signal_type;
	36
	37	DEF_VEC_I (gdb_signal_type);
	38
	39	/* An instance of this type is used to represent a signal catchpoint.
	40	It includes a "struct breakpoint" as a kind of base class; users
	41	downcast to "struct breakpoint *" when needed. A breakpoint is
	42	really of this type iff its ops pointer points to
	43	SIGNAL_CATCHPOINT_OPS. */
	44
	45	struct signal_catchpoint
	46	{
	47	/* The base class. */
	48
	49	struct breakpoint base;
	50
	51	/* Signal numbers used for the 'catch signal' feature. If no signal
	52	has been specified for filtering, its value is NULL. Otherwise,
	53	it holds a list of all signals to be caught. */
	54
	55	VEC (gdb_signal_type) *signals_to_be_caught;
	56
	57	/* If SIGNALS_TO_BE_CAUGHT is NULL, then all "ordinary" signals are
	58	caught. If CATCH_ALL is non-zero, then internal signals are
	59	caught as well. If SIGNALS_TO_BE_CAUGHT is non-NULL, then this
	60	field is ignored. */
	61
	62	int catch_all;
	63	};
	64
	65	/* The breakpoint_ops structure to be used in signal catchpoints. */
	66
	67	static struct breakpoint_ops signal_catchpoint_ops;
	68
	69	/* Count of each signal. */
	70
	71	static unsigned int *signal_catch_counts;
	72
	73	\f
	74
	75	/* A convenience wrapper for gdb_signal_to_name that returns the
	76	integer value if the name is not known. */
	77
	78	static const char *
	79	signal_to_name_or_int (enum gdb_signal sig)
	80	{
	81	const char *result = gdb_signal_to_name (sig);
	82
	83	if (strcmp (result, "?") == 0)
	84	result = plongest (sig);
	85
	86	return result;
	87	}
	88
	89	\f
	90
91	/* Implement the "dtor" breakpoint_ops method for signal
92	catchpoints. */
93
94	static void
95	signal_catchpoint_dtor (struct breakpoint *b)
96	{
97	struct signal_catchpoint c = (struct signal_catchpoint ) b;
98
99	VEC_free (gdb_signal_type, c->signals_to_be_caught);
100
101	base_breakpoint_ops.dtor (b);
102	}
103
104	/* Implement the "insert_location" breakpoint_ops method for signal
105	catchpoints. */
106
107	static int
108	signal_catchpoint_insert_location (struct bp_location *bl)
109	{
9a3c8263	110	struct signal_catchpoint c = (struct signal_catchpoint ) bl->owner;
ab04a2af TT	111	int i;
	112
	113	if (c->signals_to_be_caught != NULL)
	114	{
	115	gdb_signal_type iter;
	116
	117	for (i = 0;
	118	VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	119	i++)
	120	++signal_catch_counts[iter];
	121	}
	122	else
	123	{
	124	for (i = 0; i < GDB_SIGNAL_LAST; ++i)
	125	{
	126	if (c->catch_all \|\| !INTERNAL_SIGNAL (i))
	127	++signal_catch_counts[i];
	128	}
	129	}
	130
	131	signal_catch_update (signal_catch_counts);
	132
	133	return 0;
	134	}
	135
	136	/* Implement the "remove_location" breakpoint_ops method for signal
	137	catchpoints. */
	138
	139	static int
	140	signal_catchpoint_remove_location (struct bp_location *bl)
	141	{
9a3c8263	142	struct signal_catchpoint c = (struct signal_catchpoint ) bl->owner;
ab04a2af TT	143	int i;
	144
	145	if (c->signals_to_be_caught != NULL)
	146	{
	147	gdb_signal_type iter;
	148
	149	for (i = 0;
	150	VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	151	i++)
	152	{
	153	gdb_assert (signal_catch_counts[iter] > 0);
	154	--signal_catch_counts[iter];
	155	}
	156	}
	157	else
	158	{
	159	for (i = 0; i < GDB_SIGNAL_LAST; ++i)
	160	{
	161	if (c->catch_all \|\| !INTERNAL_SIGNAL (i))
	162	{
	163	gdb_assert (signal_catch_counts[i] > 0);
	164	--signal_catch_counts[i];
	165	}
	166	}
	167	}
	168
	169	signal_catch_update (signal_catch_counts);
	170
	171	return 0;
	172	}
	173
	174	/* Implement the "breakpoint_hit" breakpoint_ops method for signal
	175	catchpoints. */
	176
	177	static int
	178	signal_catchpoint_breakpoint_hit (const struct bp_location *bl,
	179	struct address_space *aspace,
	180	CORE_ADDR bp_addr,
	181	const struct target_waitstatus *ws)
	182	{
9a3c8263 SM	183	const struct signal_catchpoint *c
9a3c8263 SM	184	= (const struct signal_catchpoint *) bl->owner;
ab04a2af TT	185	gdb_signal_type signal_number;
	186
	187	if (ws->kind != TARGET_WAITKIND_STOPPED)
	188	return 0;
	189
	190	signal_number = ws->value.sig;
	191
	192	/* If we are catching specific signals in this breakpoint, then we
	193	must guarantee that the called signal is the same signal we are
	194	catching. */
	195	if (c->signals_to_be_caught)
	196	{
	197	int i;
	198	gdb_signal_type iter;
	199
	200	for (i = 0;
	201	VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	202	i++)
	203	if (signal_number == iter)
96f7d3f1	204	return 1;
ab04a2af	205	/* Not the same. */
96f7d3f1 PW	206	gdb_assert (!iter);
96f7d3f1 PW	207	return 0;
ab04a2af	208	}
96f7d3f1 PW	209	else
96f7d3f1 PW	210	return c->catch_all \|\| !INTERNAL_SIGNAL (signal_number);
ab04a2af TT	211	}
	212
	213	/* Implement the "print_it" breakpoint_ops method for signal
	214	catchpoints. */
	215
	216	static enum print_stop_action
	217	signal_catchpoint_print_it (bpstat bs)
	218	{
	219	struct breakpoint *b = bs->breakpoint_at;
	220	ptid_t ptid;
	221	struct target_waitstatus last;
	222	const char *signal_name;
	223
	224	get_last_target_status (&ptid, &last);
	225
	226	signal_name = signal_to_name_or_int (last.value.sig);
	227
	228	annotate_catchpoint (b->number);
	229
	230	printf_filtered (_("\nCatchpoint %d (signal %s), "), b->number, signal_name);
	231
	232	return PRINT_SRC_AND_LOC;
	233	}
	234
	235	/* Implement the "print_one" breakpoint_ops method for signal
	236	catchpoints. */
	237
	238	static void
	239	signal_catchpoint_print_one (struct breakpoint *b,
	240	struct bp_location **last_loc)
	241	{
9a3c8263	242	struct signal_catchpoint c = (struct signal_catchpoint ) b;
ab04a2af TT	243	struct value_print_options opts;
	244	struct ui_out *uiout = current_uiout;
	245
	246	get_user_print_options (&opts);
	247
	248	/* Field 4, the address, is omitted (which makes the columns
	249	not line up too nicely with the headers, but the effect
	250	is relatively readable). */
	251	if (opts.addressprint)
	252	ui_out_field_skip (uiout, "addr");
	253	annotate_field (5);
	254
	255	if (c->signals_to_be_caught
	256	&& VEC_length (gdb_signal_type, c->signals_to_be_caught) > 1)
	257	ui_out_text (uiout, "signals \"");
	258	else
	259	ui_out_text (uiout, "signal \"");
	260
	261	if (c->signals_to_be_caught)
	262	{
	263	int i;
	264	gdb_signal_type iter;
	265	struct obstack text;
	266	struct cleanup *cleanup;
	267
	268	obstack_init (&text);
	269	cleanup = make_cleanup_obstack_free (&text);
	270
	271	for (i = 0;
	272	VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	273	i++)
	274	{
	275	const char *name = signal_to_name_or_int (iter);
	276
	277	if (i > 0)
	278	obstack_grow (&text, " ", 1);
	279	obstack_grow (&text, name, strlen (name));
	280	}
	281	obstack_grow (&text, "", 1);
	282	ui_out_field_string (uiout, "what", obstack_base (&text));
	283	do_cleanups (cleanup);
	284	}
	285	else
	286	ui_out_field_string (uiout, "what",
	287	c->catch_all ? "<any signal>" : "<standard signals>");
	288	ui_out_text (uiout, "\" ");
	289
	290	if (ui_out_is_mi_like_p (uiout))
	291	ui_out_field_string (uiout, "catch-type", "signal");
	292	}
	293
	294	/* Implement the "print_mention" breakpoint_ops method for signal
	295	catchpoints. */
	296
	297	static void
	298	signal_catchpoint_print_mention (struct breakpoint *b)
	299	{
9a3c8263	300	struct signal_catchpoint c = (struct signal_catchpoint ) b;
ab04a2af TT	301
	302	if (c->signals_to_be_caught)
	303	{
	304	int i;
	305	gdb_signal_type iter;
	306
	307	if (VEC_length (gdb_signal_type, c->signals_to_be_caught) > 1)
	308	printf_filtered (_("Catchpoint %d (signals"), b->number);
	309	else
	310	printf_filtered (_("Catchpoint %d (signal"), b->number);
	311
	312	for (i = 0;
	313	VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	314	i++)
	315	{
	316	const char *name = signal_to_name_or_int (iter);
	317
	318	printf_filtered (" %s", name);
	319	}
	320	printf_filtered (")");
	321	}
	322	else if (c->catch_all)
	323	printf_filtered (_("Catchpoint %d (any signal)"), b->number);
	324	else
	325	printf_filtered (_("Catchpoint %d (standard signals)"), b->number);
	326	}
	327
	328	/* Implement the "print_recreate" breakpoint_ops method for signal
	329	catchpoints. */
	330
	331	static void
	332	signal_catchpoint_print_recreate (struct breakpoint b, struct ui_file fp)
	333	{
9a3c8263	334	struct signal_catchpoint c = (struct signal_catchpoint ) b;
ab04a2af TT	335
	336	fprintf_unfiltered (fp, "catch signal");
	337
	338	if (c->signals_to_be_caught)
	339	{
	340	int i;
	341	gdb_signal_type iter;
	342
	343	for (i = 0;
	344	VEC_iterate (gdb_signal_type, c->signals_to_be_caught, i, iter);
	345	i++)
	346	fprintf_unfiltered (fp, " %s", signal_to_name_or_int (iter));
	347	}
	348	else if (c->catch_all)
	349	fprintf_unfiltered (fp, " all");
c780cc2f	350	fputc_unfiltered ('\n', fp);
ab04a2af TT	351	}
	352
	353	/* Implement the "explains_signal" breakpoint_ops method for signal
	354	catchpoints. */
	355
47591c29	356	static int
427cd150	357	signal_catchpoint_explains_signal (struct breakpoint *b, enum gdb_signal sig)
ab04a2af	358	{
47591c29	359	return 1;
ab04a2af TT	360	}
	361
	362	/* Create a new signal catchpoint. TEMPFLAG is true if this should be
	363	a temporary catchpoint. FILTER is the list of signals to catch; it
	364	can be NULL, meaning all signals. CATCH_ALL is a flag indicating
	365	whether signals used internally by gdb should be caught; it is only
	366	valid if FILTER is NULL. If FILTER is NULL and CATCH_ALL is zero,
	367	then internal signals like SIGTRAP are not caught. */
	368
	369	static void
	370	create_signal_catchpoint (int tempflag, VEC (gdb_signal_type) *filter,
	371	int catch_all)
	372	{
	373	struct signal_catchpoint *c;
	374	struct gdbarch *gdbarch = get_current_arch ();
	375
	376	c = XNEW (struct signal_catchpoint);
	377	init_catchpoint (&c->base, gdbarch, tempflag, NULL, &signal_catchpoint_ops);
	378	c->signals_to_be_caught = filter;
	379	c->catch_all = catch_all;
	380
	381	install_breakpoint (0, &c->base, 1);
	382	}
	383
	384
	385	/* Splits the argument using space as delimiter. Returns an xmalloc'd
	386	filter list, or NULL if no filtering is required. */
	387
	388	static VEC (gdb_signal_type) *
	389	catch_signal_split_args (char arg, int catch_all)
	390	{
	391	VEC (gdb_signal_type) *result = NULL;
	392	struct cleanup *cleanup = make_cleanup (VEC_cleanup (gdb_signal_type),
	393	&result);
	394	int first = 1;
	395
	396	while (*arg != '\0')
	397	{
	398	int num;
	399	gdb_signal_type signal_number;
	400	char one_arg, endptr;
	401	struct cleanup *inner_cleanup;
	402
	403	one_arg = extract_arg (&arg);
	404	if (one_arg == NULL)
	405	break;
	406	inner_cleanup = make_cleanup (xfree, one_arg);
	407
	408	/* Check for the special flag "all". */
	409	if (strcmp (one_arg, "all") == 0)
	410	{
	411	arg = skip_spaces (arg);
	412	if (*arg != '\0' \|\| !first)
	413	error (_("'all' cannot be caught with other signals"));
	414	*catch_all = 1;
	415	gdb_assert (result == NULL);
	416	do_cleanups (inner_cleanup);
	417	discard_cleanups (cleanup);
	418	return NULL;
	419	}
	420
	421	first = 0;
	422
	423	/* Check if the user provided a signal name or a number. */
424	num = (int) strtol (one_arg, &endptr, 0);
425	if (*endptr == '\0')
426	signal_number = gdb_signal_from_command (num);
427	else
428	{
429	signal_number = gdb_signal_from_name (one_arg);
430	if (signal_number == GDB_SIGNAL_UNKNOWN)
431	error (_("Unknown signal name '%s'."), one_arg);
432	}
433
434	VEC_safe_push (gdb_signal_type, result, signal_number);
435	do_cleanups (inner_cleanup);
436	}
437
438	discard_cleanups (cleanup);
439	return result;
440	}
441
442	/* Implement the "catch signal" command. */
443
444	static void
445	catch_signal_command (char *arg, int from_tty,
446	struct cmd_list_element *command)
447	{
448	int tempflag, catch_all = 0;
449	VEC (gdb_signal_type) *filter;
ab04a2af TT	450
	451	tempflag = get_cmd_context (command) == CATCH_TEMPORARY;
	452
	453	arg = skip_spaces (arg);
	454
	455	/* The allowed syntax is:
	456	catch signal
	457	catch signal <name \| number> [<name \| number> ... <name \| number>]
	458
	459	Let's check if there's a signal name. */
	460
	461	if (arg != NULL)
	462	filter = catch_signal_split_args (arg, &catch_all);
	463	else
	464	filter = NULL;
	465
	466	create_signal_catchpoint (tempflag, filter, catch_all);
	467	}
	468
	469	static void
	470	initialize_signal_catchpoint_ops (void)
	471	{
	472	struct breakpoint_ops *ops;
	473
	474	initialize_breakpoint_ops ();
	475
	476	ops = &signal_catchpoint_ops;
	477	*ops = base_breakpoint_ops;
	478	ops->dtor = signal_catchpoint_dtor;
	479	ops->insert_location = signal_catchpoint_insert_location;
	480	ops->remove_location = signal_catchpoint_remove_location;
	481	ops->breakpoint_hit = signal_catchpoint_breakpoint_hit;
	482	ops->print_it = signal_catchpoint_print_it;
	483	ops->print_one = signal_catchpoint_print_one;
	484	ops->print_mention = signal_catchpoint_print_mention;
	485	ops->print_recreate = signal_catchpoint_print_recreate;
	486	ops->explains_signal = signal_catchpoint_explains_signal;
	487	}
	488
	489	initialize_file_ftype _initialize_break_catch_sig;
	490
	491	void
	492	_initialize_break_catch_sig (void)
	493	{
	494	initialize_signal_catchpoint_ops ();
	495
	496	signal_catch_counts = XCNEWVEC (unsigned int, GDB_SIGNAL_LAST);
	497
	498	add_catch_command ("signal", _("\
	499	Catch signals by their names and/or numbers.\n\
	500	Usage: catch signal [[NAME\|NUMBER] [NAME\|NUMBER]...\|all]\n\
	501	Arguments say which signals to catch. If no arguments\n\
	502	are given, every \"normal\" signal will be caught.\n\
	503	The argument \"all\" means to also catch signals used by GDB.\n\
	504	Arguments, if given, should be one or more signal names\n\
	505	(if your system supports that), or signal numbers."),
	506	catch_signal_command,
	507	signal_completer,
	508	CATCH_PERMANENT,
	509	CATCH_TEMPORARY);
	510	}