gdb/testsuite/gdb.base/bp-cmds-continue-ctrl-c.exp

# Copyright 2017-2021 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/>.

# Set a breakpoint with a "continue" command attached, let the
# inferior hit the breakpoint continuously.  Check that we can use ^C
# to interrupt the command, and that if ^C is pressed while GDB has
# the terminal (between the stop and the re-resume), the resulting
# "Quit" doesn't mess up the debug session.

if [target_info exists gdb,nosignals] {
    verbose "Skipping because of nosignals."
    continue
}

# This test requires sending ^C to interrupt the running target.
if [target_info exists gdb,nointerrupts] {
    verbose "Skipping because of nointerrupts."
    return
}

standard_testfile

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

# See intro.

proc do_test {} {
    global srcfile binfile
    global gdb_prompt

    gdb_test "break foo" "Breakpoint .*" "set breakpoint"

    gdb_test \
	[multi_line_input \
	     {commands} \
	     {  c} \
	     {end}] \
	"" "commands"

    set test "stop with control-c"

    for {set iter 0} {$iter < 20} {incr iter} {

	# Useful for debugging.
	#send_user "iter: $iter\n"

	# Consume one breakpoint hit (at least), to make sure that the
	# continue actually continues between attempts, as opposed to
	# "c" not actually resuming and then Ctrl-C managing to
	# interrupt anyway.
	if {[gdb_test_multiple "continue" "$test (continue)" {
	    -re "Continuing.*Breakpoint \[^\r\n\]*\r\n" {
	    }
	}] != 0} {
	    return
	}

	set internal_pass "IPASS: $test (iter $iter)"

	# Breakpoint commands run after the target is considered
	# stopped, and thus run with GDB owning the terminal.  That
	# means that it is expected that a Ctrl-C that arrives between
	#  - GDB reporting the breakpoint hit, and,
	#  - the breakpoint command continuing the target
	# results in a Quit.

	after 200 {send_gdb "\003"}
	if {[gdb_test_multiple "" "$test (unexpected)" {
	    -re "Program terminated with signal SIGALRM.*\r\n$gdb_prompt $" {
		fail "$test (SIGALRM)"
		return
	    }
	    -re "Program received signal SIGINT.*\r\n$gdb_prompt $" {
		send_log "$internal_pass (SIGINT)\n"
	    }
	    -re "Quit\r\n$gdb_prompt $" {
		send_log "$internal_pass (Quit)\n"

		# Check that if we managed to quit somewhere deep in
		# the unwinders, we can still unwind again.
		set ok 0
		gdb_test_multiple "bt" "$internal_pass (bt)" {
		    -re "#0.*$gdb_prompt $" {
			send_log "$internal_pass (bt)\n"
			set ok 1
		    }
		}
		if {!$ok} {
		    return
		}
	    }
	    -re "Quit\r\n\r\nCommand aborted.\r\n$gdb_prompt $" {
		send_log "$internal_pass (Command aborted)\n"
	    }
	    -re "Breakpoint \[^\r\n\]*$srcfile" {
		exp_continue
	    }
	}] != 0} {
	    break
	}
    }

    gdb_assert {$iter == 20} "stop with control-c"
}

# With native debugging and "run" (with job control), if the inferior
# is running, the Ctrl-C reaches the inferior directly, not GDB.  With
# native debugging and "attach", or with remote debugging, the Ctrl-C
# reaches GDB first.  So for completeness, try both "run" and
# "attach".

with_test_prefix "run" {
    clean_restart $binfile

    if {![runto_main]} {
	return -1
    }

    do_test
}

with_test_prefix "attach" {
    if {[can_spawn_for_attach]} {
	clean_restart $binfile

	set test_spawn_id [spawn_wait_for_attach $binfile]
	set testpid [spawn_id_get_pid $test_spawn_id]

	gdb_test "attach $testpid" "Attaching to.*process $testpid.*" "attach"

	do_test

	kill_wait_spawned_process $test_spawn_id
    }
}