binutils-gdb/gdb/testsuite/gdb.threads/stop-with-handle.exp

# Copyright 2019-2020 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 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/>.

# This test covers a case where SIGSTOP has been configured to be
# passed to the target with GDB's 'handle' command, and then a
# multi-threaded inferior encounters an event that causes all theads
# to be stopped.
#
# The problem that (used) to exist was that GDB would see the SIGSTOP,
# but decide to ignore the signal based on the handle table.

standard_testfile

if {[prepare_for_testing "failed to prepare" \
	 "${testfile}" "${srcfile}" {debug pthreads}]} {
    return -1
}

if ![runto_main] then {
    fail "can't run to main"
    return 0
}

# Have SIGSTOP sent to the inferior.
gdb_test "handle SIGSTOP nostop noprint pass" \
    [multi_line \
	 "Signal\[ \t\]+Stop\[ \t\]+Print\[ \t\]+Pass to program\[ \t\]+Description" \
	 "SIGSTOP\[ \t\]+No\[ \t\]+No\[ \t\]+Yes\[ \t\]+Stopped \\(signal\\)"]

# Create a breakpoint, and when we hit it automatically finish the
# current frame.
gdb_breakpoint breakpt

# When the bug triggers this continue never completes.  GDB hits the
# breakpoint in thread 1, and then tries to stop the second thread by
# sending it SIGSTOP.  GDB sees the SIGSTOP arrive in thread 2 but
# incorrect decides to pass the SIGSTOP to the thread rather than
# bringing the thread to a stop.
gdb_continue_to_breakpoint breakpt