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Index: ChangeLog 

2005-01-24  Andrew Cagney  <cagney@gnu.org>

	* infrun.c (handle_inferior_event): Handle back-to-back and nested
	signals where the step_resume_breakpoint may have already been
	inserted.

Index: testsuite/ChangeLog
2005-01-24  Andrew Cagney  <cagney@gnu.org>

	* gdb.base/sigrepeat.exp, gdb.base/sigrepeat.c: New test.
This commit is contained in:
Andrew Cagney 2005-01-24 22:00:59 +00:00
parent 45181ed16d
commit 9d799f85e0
5 changed files with 194 additions and 5 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2005-01-24 Andrew Cagney <cagney@gnu.org>
* infrun.c (handle_inferior_event): Handle back-to-back and nested
signals where the step_resume_breakpoint may have already been
inserted.
2005-01-24 Andrew Cagney <cagney@gnu.org>
* configure: Regenerate, ../gettext.m4 was updated.

23
gdb/infrun.c
View File

@ -1933,12 +1933,16 @@ process_event_stop_test:
breakpoint. */
insert_step_resume_breakpoint_at_frame (get_current_frame ());
ecs->step_after_step_resume_breakpoint = 1;
keep_going (ecs);
return;
}
else if (step_range_end != 0
&& stop_signal != TARGET_SIGNAL_0
&& stop_pc >= step_range_start && stop_pc < step_range_end
&& frame_id_eq (get_frame_id (get_current_frame ()),
step_frame_id))
if (step_range_end != 0
&& stop_signal != TARGET_SIGNAL_0
&& stop_pc >= step_range_start && stop_pc < step_range_end
&& frame_id_eq (get_frame_id (get_current_frame ()),
step_frame_id)
&& step_resume_breakpoint == NULL)
{
/* The inferior is about to take a signal that will take it
out of the single step range. Set a breakpoint at the
@ -1950,7 +1954,16 @@ process_event_stop_test:
while in the single-step range. Nested signals aren't a
problem as they eventually all return. */
insert_step_resume_breakpoint_at_frame (get_current_frame ());
keep_going (ecs);
return;
}
/* Note: step_resume_breakpoint may be non-NULL. This occures
when either there's a nested signal, or when there's a
pending signal enabled just as the signal handler returns
(leaving the inferior at the step-resume-breakpoint without
actually executing it). Either way continue until the
breakpoint is really hit. */
keep_going (ecs);
return;
}

4
gdb/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2005-01-24 Andrew Cagney <cagney@gnu.org>
* gdb.base/sigrepeat.exp, gdb.base/sigrepeat.c: New test.
2005-01-19 Andrew Cagney <cagney@gnu.org>
* gdb.stabs/Makefile.in (Makefile): Update dependencies -

104
gdb/testsuite/gdb.base/sigrepeat.c Normal file
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@ -0,0 +1,104 @@
/* This testcase is part of GDB, the GNU debugger.
Copyright 2004, 2005 Free Software Foundation, Inc.
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <sys/time.h>
static volatile int done[2];
static volatile int repeats[2];
static int itimer[2] = { ITIMER_REAL, ITIMER_VIRTUAL };
static int alarm[2] = { SIGALRM, SIGVTALRM };
static void
handler (int sig)
{
int sigi;
switch (sig)
{
case SIGALRM: sigi = 0; break;
case SIGVTALRM: sigi = 1; break;
default: abort ();
}
if (repeats[sigi]++ > 3)
{
/* Hit with enough signals, cancel everything and get out. */
{
struct itimerval itime;
memset (&itime, 0, sizeof (itime));
setitimer (itimer[sigi], &itime, NULL);
}
{
struct sigaction action;
memset (&action, 0, sizeof (action));
action.sa_handler = SIG_IGN;
sigaction (sig, &action, NULL);
}
done[sigi] = 1;
return;
}
/* Set up a nested virtual timer. */
while (1)
{
/* Wait until a signal has become pending, that way when this
handler returns it will be immediatly delivered leading to
back-to-back signals. */
sigset_t set;
sigemptyset (&set);
if (sigpending (&set) < 0)
{
perror ("sigrepeat");
abort ();
}
if (sigismember (&set, sig))
break;
}
} /* handler */
main ()
{
int i;
/* Set up the signal handler. */
for (i = 0; i < 2; i++)
{
struct sigaction action;
memset (&action, 0, sizeof (action));
action.sa_handler = handler;
sigaction (alarm[i], &action, NULL);
}
/* Set up a rapidly repeating timers. A timer, rather than SIGSEGV,
is used as after a timer handler returns the interrupted code can
safely resume. The intent is for the program to swamp GDB with a
backlog of pending signals. */
for (i = 0; i < 2; i++)
{
struct itimerval itime;
memset (&itime, 0, sizeof (itime));
itime.it_interval.tv_usec = 1;
itime.it_value.tv_usec = 250 * 1000;
setitimer (itimer[i], &itime, NULL);
}
/* Wait. */
while (!done[0] && !done[1]); /* infinite loop */
return 0;
}

62
gdb/testsuite/gdb.base/sigrepeat.exp Normal file
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@ -0,0 +1,62 @@
# Copyright 2004, 2005 Free Software Foundation, Inc.
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# The program sigrepeat.c creates a repeating timer and then waits for
# it to fire multiple times. The objective is to create a backlog if
# sigalrm signals and hence cause repeated signal delivery without any
# cpu advancment.
if [target_info exists gdb,nosignals] {
verbose "Skipping sigstep.exp because of nosignals."
continue
}
if $tracelevel then {
strace $tracelevel
}
set prms_id 0
set bug_id 0
set testfile sigrepeat
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
untested "Couldn't compile ${module}.c"
return -1
}
# get things started
gdb_exit
gdb_start
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
# Advance to main
if { ![runto_main] } then {
gdb_suppress_tests;
}
# Run to the signal handler wait loop.
set infinite_loop [gdb_get_line_number {infinite loop}]
gdb_test "advance $infinite_loop" "" "advance to infinite loop"
# Make the first of many signals come pending
sleep 1
# Try to step off this line
gdb_test "next" "return 0;.*"