From 36cf1806a87fdd208c704d0768af232ce35aae9f Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Wed, 14 Sep 2016 11:48:31 -0600 Subject: [PATCH] PR gdb/20604 - fix "quit" when an invalid expression is used This fixes PR gdb/20604. The bug here is that passing an invalid expression to "quit" -- e.g., "quit()" -- causes gdb to enter a non-functioning state. The immediate problem is that quit_force resets the terminal before evaluating the expression. However, it seemed to me that it doesn't really make sense to pass the quit_force argument to kill_or_detach (which passes it to to_detach), first because conflating the exit status for "quit" and the signal to pass when detaching doesn't make sense, and second because to_detach implementations generally only accept a constant here, while "quit" accepts an expression. So, I removed that. As an aside, I think the "detach SIGNO" functionality is not documented. Built and regtested on x86-64 Fedora 24. 2016-09-21 Tom Tromey PR gdb/20604: * top.h (quit_force): Update. * top.c (quit_force): Changed type of first argument. Don't evaluate expression. Pass NULL to kill_or_detach. * cli/cli-cmds.c (quit_command): Evaluate "args". 2016-09-21 Tom Tromey PR gdb/20604: * gdb.base/quit.exp: New file. --- gdb/ChangeLog | 8 ++++++++ gdb/cli/cli-cmds.c | 13 ++++++++++++- gdb/testsuite/ChangeLog | 5 +++++ gdb/testsuite/gdb.base/quit.exp | 35 +++++++++++++++++++++++++++++++++++ gdb/top.c | 12 ++++-------- gdb/top.h | 2 +- 6 files changed, 65 insertions(+), 10 deletions(-) create mode 100644 gdb/testsuite/gdb.base/quit.exp diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 4f16b09..6753ebe 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,11 @@ +2016-09-21 Tom Tromey + + PR gdb/20604: + * top.h (quit_force): Update. + * top.c (quit_force): Changed type of first argument. Don't + evaluate expression. Pass NULL to kill_or_detach. + * cli/cli-cmds.c (quit_command): Evaluate "args". + 2016-09-21 Simon Marchi * .gitignore: Ignore more files. diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c index 5ab4791..384a336 100644 --- a/gdb/cli/cli-cmds.c +++ b/gdb/cli/cli-cmds.c @@ -344,12 +344,23 @@ show_configuration (char *args, int from_tty) void quit_command (char *args, int from_tty) { + int exit_code = 0; + + /* An optional expression may be used to cause gdb to terminate with + the value of that expression. */ + if (args) + { + struct value *val = parse_and_eval (args); + + exit_code = (int) value_as_long (val); + } + if (!quit_confirm ()) error (_("Not confirmed.")); query_if_trace_running (from_tty); - quit_force (args, from_tty); + quit_force (args ? &exit_code : NULL, from_tty); } static void diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 3da0314..1b8bc1a 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2016-09-21 Tom Tromey + + PR gdb/20604: + * gdb.base/quit.exp: New file. + 2016-09-21 Simon Marchi * .gitignore: New file. diff --git a/gdb/testsuite/gdb.base/quit.exp b/gdb/testsuite/gdb.base/quit.exp new file mode 100644 index 0000000..1c9db64 --- /dev/null +++ b/gdb/testsuite/gdb.base/quit.exp @@ -0,0 +1,35 @@ +# Copyright (C) 2016 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 . + +# Check the "quit" command. + +clean_restart + +# Test that a syntax error causes quit to abort. +# Regression test for PR gdb/20604. +gdb_test "quit()" "A syntax error in expression, near .*" \ + "quit with syntax error" + +# Test that an expression can be used to set the error code. +send_gdb "quit 22+1\n" +set result [wait -i $gdb_spawn_id] +verbose $result +if {[lindex $result 2] == 0 && [lindex $result 3] == 23} { + pass "quit with expression" +} else { + fail "quit with expression" +} +close $gdb_spawn_id +clear_gdb_spawn_id diff --git a/gdb/top.c b/gdb/top.c index 320c296..3cfa113 100644 --- a/gdb/top.c +++ b/gdb/top.c @@ -1625,7 +1625,7 @@ undo_terminal_modifications_before_exit (void) /* Quit without asking for confirmation. */ void -quit_force (char *args, int from_tty) +quit_force (int *exit_arg, int from_tty) { int exit_code = 0; struct qt_args qt; @@ -1634,16 +1634,12 @@ quit_force (char *args, int from_tty) /* An optional expression may be used to cause gdb to terminate with the value of that expression. */ - if (args) - { - struct value *val = parse_and_eval (args); - - exit_code = (int) value_as_long (val); - } + if (exit_arg) + exit_code = *exit_arg; else if (return_child_result) exit_code = return_child_result_value; - qt.args = args; + qt.args = NULL; qt.from_tty = from_tty; /* We want to handle any quit errors and exit regardless. */ diff --git a/gdb/top.h b/gdb/top.h index ee664c1..acdb8e9 100644 --- a/gdb/top.h +++ b/gdb/top.h @@ -212,7 +212,7 @@ extern void read_command_file (FILE *); extern void init_history (void); extern void command_loop (void); extern int quit_confirm (void); -extern void quit_force (char *, int); +extern void quit_force (int *, int); extern void quit_command (char *, int); extern void quit_cover (void); extern void execute_command (char *, int); -- 2.7.4