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/* Everything about vfork catchpoints, for GDB.
Copyright (C) 1986-2024 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 "annotate.h"
#include "arch-utils.h"
#include "breakpoint.h"
#include "cli/cli-decode.h"
#include "inferior.h"
#include "mi/mi-common.h"
#include "target.h"
#include "valprint.h"
/* An instance of this type is used to represent a fork or vfork
catchpoint. A breakpoint is really of this type iff its ops pointer points
to CATCH_FORK_BREAKPOINT_OPS. */
struct fork_catchpoint : public catchpoint
{
fork_catchpoint (struct gdbarch *gdbarch, bool temp,
const char *cond_string, bool is_vfork_)
: catchpoint (gdbarch, temp, cond_string),
is_vfork (is_vfork_)
{
}
int insert_location (struct bp_location *) override;
int remove_location (struct bp_location *,
enum remove_bp_reason reason) override;
int breakpoint_hit (const struct bp_location *bl,
const address_space *aspace,
CORE_ADDR bp_addr,
const target_waitstatus &ws) override;
enum print_stop_action print_it (const bpstat *bs) const override;
bool print_one (const bp_location **) const override;
void print_mention () const override;
void print_recreate (struct ui_file *fp) const override;
/* True if the breakpoint is for vfork, false for fork. */
bool is_vfork;
/* Process id of a child process whose forking triggered this
catchpoint. This field is only valid immediately after this
catchpoint has triggered. */
ptid_t forked_inferior_pid = null_ptid;
};
/* Implement the "insert" method for fork catchpoints. */
int
fork_catchpoint::insert_location (struct bp_location *bl)
{
if (is_vfork)
return target_insert_vfork_catchpoint (inferior_ptid.pid ());
else
return target_insert_fork_catchpoint (inferior_ptid.pid ());
}
/* Implement the "remove" method for fork catchpoints. */
int
fork_catchpoint::remove_location (struct bp_location *bl,
enum remove_bp_reason reason)
{
if (is_vfork)
return target_remove_vfork_catchpoint (inferior_ptid.pid ());
else
return target_remove_fork_catchpoint (inferior_ptid.pid ());
}
/* Implement the "breakpoint_hit" method for fork catchpoints. */
int
fork_catchpoint::breakpoint_hit (const struct bp_location *bl,
const address_space *aspace,
CORE_ADDR bp_addr,
const target_waitstatus &ws)
{
if (ws.kind () != (is_vfork
? TARGET_WAITKIND_VFORKED
: TARGET_WAITKIND_FORKED))
return 0;
forked_inferior_pid = ws.child_ptid ();
return 1;
}
/* Implement the "print_it" method for fork catchpoints. */
enum print_stop_action
fork_catchpoint::print_it (const bpstat *bs) const
{
struct ui_out *uiout = current_uiout;
annotate_catchpoint (number);
maybe_print_thread_hit_breakpoint (uiout);
if (disposition == disp_del)
uiout->text ("Temporary catchpoint ");
else
uiout->text ("Catchpoint ");
if (uiout->is_mi_like_p ())
{
uiout->field_string ("reason",
async_reason_lookup (is_vfork
? EXEC_ASYNC_VFORK
: EXEC_ASYNC_FORK));
uiout->field_string ("disp", bpdisp_text (disposition));
}
uiout->field_signed ("bkptno", number);
if (is_vfork)
uiout->text (" (vforked process ");
else
uiout->text (" (forked process ");
uiout->field_signed ("newpid", forked_inferior_pid.pid ());
uiout->text ("), ");
return PRINT_SRC_AND_LOC;
}
/* Implement the "print_one" method for fork catchpoints. */
bool
fork_catchpoint::print_one (const bp_location **last_loc) const
{
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)
uiout->field_skip ("addr");
annotate_field (5);
const char *name = is_vfork ? "vfork" : "fork";
uiout->text (name);
if (forked_inferior_pid != null_ptid)
{
uiout->text (", process ");
uiout->field_signed ("what", forked_inferior_pid.pid ());
uiout->spaces (1);
}
if (uiout->is_mi_like_p ())
uiout->field_string ("catch-type", name);
return true;
}
/* Implement the "print_mention" method for fork catchpoints. */
void
fork_catchpoint::print_mention () const
{
gdb_printf (_("Catchpoint %d (%s)"), number,
is_vfork ? "vfork" : "fork");
}
/* Implement the "print_recreate" method for fork catchpoints. */
void
fork_catchpoint::print_recreate (struct ui_file *fp) const
{
gdb_printf (fp, "catch %s", is_vfork ? "vfork" : "fork");
print_recreate_thread (fp);
}
static void
create_fork_vfork_event_catchpoint (struct gdbarch *gdbarch,
bool temp, const char *cond_string,
bool is_vfork)
{
std::unique_ptr<fork_catchpoint> c
(new fork_catchpoint (gdbarch, temp, cond_string, is_vfork));
install_breakpoint (0, std::move (c), 1);
}
enum catch_fork_kind
{
catch_fork_temporary, catch_vfork_temporary,
catch_fork_permanent, catch_vfork_permanent
};
static void
catch_fork_command_1 (const char *arg, int from_tty,
struct cmd_list_element *command)
{
struct gdbarch *gdbarch = get_current_arch ();
const char *cond_string = NULL;
catch_fork_kind fork_kind;
fork_kind = (catch_fork_kind) (uintptr_t) command->context ();
bool temp = (fork_kind == catch_fork_temporary
|| fork_kind == catch_vfork_temporary);
if (!arg)
arg = "";
arg = skip_spaces (arg);
/* The allowed syntax is:
catch [v]fork
catch [v]fork if <cond>
First, check if there's an if clause. */
cond_string = ep_parse_optional_if_clause (&arg);
if ((*arg != '\0') && !isspace (*arg))
error (_("Junk at end of arguments."));
/* If this target supports it, create a fork or vfork catchpoint
and enable reporting of such events. */
switch (fork_kind)
{
case catch_fork_temporary:
case catch_fork_permanent:
create_fork_vfork_event_catchpoint (gdbarch, temp, cond_string, false);
break;
case catch_vfork_temporary:
case catch_vfork_permanent:
create_fork_vfork_event_catchpoint (gdbarch, temp, cond_string, true);
break;
default:
error (_("unsupported or unknown fork kind; cannot catch it"));
break;
}
}
void _initialize_break_catch_fork ();
void
_initialize_break_catch_fork ()
{
add_catch_command ("fork", _("Catch calls to fork."),
catch_fork_command_1,
NULL,
(void *) (uintptr_t) catch_fork_permanent,
(void *) (uintptr_t) catch_fork_temporary);
add_catch_command ("vfork", _("Catch calls to vfork."),
catch_fork_command_1,
NULL,
(void *) (uintptr_t) catch_vfork_permanent,
(void *) (uintptr_t) catch_vfork_temporary);
}
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