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Implement "set cwd" command on GDB

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This commit adds new "set/show cwd" commands, which are used to
set/show the current working directory of the inferior that will be
started.

The idea here is that "set cwd" will become the de facto way of
setting the inferior's cwd.  Currently, the user can use "cd" for
that, but there are side effects: with "cd", GDB also switches to
another directory, and that can impact the loading of scripts and
other files.  With "set cwd", we separate the logic into a new
command.

To maintain backward compatibility, if the user issues a "cd" command
but doesn't use "set cwd", then the inferior's cwd will still be
changed according to what the user specified.  However, "set cwd" has
precedence over "cd", so it can always be used to override it.

"set cwd" works in the following way:

- If the user sets the inferior's cwd by using "set cwd", then this
  directory is saved into current_inferior ()->cwd and is used when
  the inferior is started (see below).

- If the user doesn't set the inferior's cwd by using "set cwd", but
  rather use the "cd" command as before, then this directory is
  inherited by the inferior because GDB will have chdir'd into it.

On Unix-like hosts, the way the directory is changed before the
inferior execution is by expanding the user set directory before the
fork, and then "chdir" after the call to fork/vfork on
"fork_inferior", but before the actual execution.  On Windows, the
inferior cwd set by the user is passed directly to the CreateProcess
call, which takes care of the actual chdir for us.

This way, we'll make sure that GDB's cwd is not affected by the user
set cwd.

gdb/ChangeLog:
2017-10-04  Sergio Durigan Junior  <sergiodj@redhat.com>

	* NEWS (New commands): Mention "set/show cwd".
	* cli/cli-cmds.c (_initialize_cli_cmds): Mention "set cwd" on
	"cd" command's help text.
	* common/common-inferior.h (get_inferior_cwd): New prototype.
	* infcmd.c (inferior_cwd_scratch): New global variable.
	(set_inferior_cwd): New function.
	(get_inferior_cwd): Likewise.
	(set_cwd_command): Likewise.
	(show_cwd_command): Likewise.
	(_initialize_infcmd): Add "set/show cwd" commands.
	* inferior.h (class inferior) <cwd>: New field.
	* nat/fork-inferior.c: Include "gdb_tilde_expand.h".
	(fork_inferior): Change inferior's cwd before its execution.
	* windows-nat.c (windows_create_inferior): Pass inferior's cwd
	to CreateProcess.

gdb/gdbserver/ChangeLog:
2017-10-04  Sergio Durigan Junior  <sergiodj@redhat.com>

	* inferiors.c (current_inferior_cwd): New global variable.
	(get_inferior_cwd): New function.
	* inferiors.h (struct process_info) <cwd>: New field.

gdb/doc/ChangeLog:
2017-10-04  Sergio Durigan Junior  <sergiodj@redhat.com>

	* gdb.texinfo (Starting your Program) <The working directory.>:
	Mention new "set cwd" command.
	(Working Directory) <Your Program's Working Directory>:
	Rephrase to explain that "set cwd" exists and is the default
	way to change the inferior's cwd.

gdb/testsuite/ChangeLog:
2017-10-04  Sergio Durigan Junior  <sergiodj@redhat.com>

	* gdb.base/set-cwd.c: New file.
	* gdb.base/set-cwd.exp: Likewise.
This commit is contained in:
Sergio Durigan Junior 2017-09-11 01:13:50 -04:00
parent 7da0a88674
commit d092c5a246
15 changed files with 454 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

18
gdb/ChangeLog
View file

@ -1,3 +1,21 @@
2017-10-04 Sergio Durigan Junior <sergiodj@redhat.com>
* NEWS (New commands): Mention "set/show cwd".
* cli/cli-cmds.c (_initialize_cli_cmds): Mention "set cwd" on
"cd" command's help text.
* common/common-inferior.h (get_inferior_cwd): New prototype.
* infcmd.c (inferior_cwd_scratch): New global variable.
(set_inferior_cwd): New function.
(get_inferior_cwd): Likewise.
(set_cwd_command): Likewise.
(show_cwd_command): Likewise.
(_initialize_infcmd): Add "set/show cwd" commands.
* inferior.h (class inferior) <cwd>: New field.
* nat/fork-inferior.c: Include "gdb_tilde_expand.h".
(fork_inferior): Change inferior's cwd before its execution.
* windows-nat.c (windows_create_inferior): Pass inferior's cwd
to CreateProcess.
2017-10-04 Sergio Durigan Junior <sergiodj@redhat.com>
* Makefile.in (SFILES): Add gdb_tilde_expand.c.

3
gdb/NEWS
View file

@ -67,6 +67,9 @@ QStartupWithShell
* New commands
set|show cwd
Set and show the current working directory for the inferior.
set|show compile-gcc
Set and show compilation command used for compiling and injecting code
with the 'compile' commands.

8
gdb/cli/cli-cmds.c
View file

@ -1727,9 +1727,11 @@ The commands below can be used to select other frames by number or address."),
Print working directory. This is used for your program as well."));
c = add_cmd ("cd", class_files, cd_command, _("\
Set working directory to DIR for debugger and program being debugged.\n\
The change does not take effect for the program being debugged\n\
until the next time it is started."), &cmdlist);
Set working directory to DIR for debugger.\n\
The debugger's current working directory specifies where scripts and other\n\
files that can be loaded by GDB are located.\n\
In order to change the inferior's current working directory, the recommended\n\
way is to use the \"set cwd\" command."), &cmdlist);
set_cmd_completer (c, filename_completer);
add_com ("echo", class_support, echo_command, _("\

4
gdb/common/common-inferior.h
View file

@ -30,4 +30,8 @@ extern const char *get_exec_wrapper ();
otherwise return 0 in that case. */
extern char *get_exec_file (int err);
/* Return the inferior's current working directory. If nothing has
been set, then return NULL. */
extern const char *get_inferior_cwd ();
#endif /* ! COMMON_INFERIOR_H */

8
gdb/doc/ChangeLog
View file

@ -1,3 +1,11 @@
2017-10-04 Sergio Durigan Junior <sergiodj@redhat.com>
* gdb.texinfo (Starting your Program) <The working directory.>:
Mention new "set cwd" command.
(Working Directory) <Your Program's Working Directory>:
Rephrase to explain that "set cwd" exists and is the default
way to change the inferior's cwd.
2017-09-25 Andreas Arnez <arnez@linux.vnet.ibm.com>
* gdb.texinfo (S/390 and System z Features): Document the new

53
gdb/doc/gdb.texinfo
View file

@ -2057,8 +2057,9 @@ environment} to change parts of the environment that affect
your program. @xref{Environment, ,Your Program's Environment}.
@item The @emph{working directory.}
Your program inherits its working directory from @value{GDBN}. You can set
the @value{GDBN} working directory with the @code{cd} command in @value{GDBN}.
You can set your program's working directory with the command
@kbd{set cwd}. If you do not set any working directory with this
command, your program will inherit @value{GDBN}'s working directory.
@xref{Working Directory, ,Your Program's Working Directory}.
@item The @emph{standard input and output.}
@ -2434,23 +2435,51 @@ variables to files that are only run when you sign on, such as
@section Your Program's Working Directory
@cindex working directory (of your program)
Each time you start your program with @code{run}, it inherits its
working directory from the current working directory of @value{GDBN}.
The @value{GDBN} working directory is initially whatever it inherited
from its parent process (typically the shell), but you can specify a new
working directory in @value{GDBN} with the @code{cd} command.
The @value{GDBN} working directory also serves as a default for the commands
that specify files for @value{GDBN} to operate on. @xref{Files, ,Commands to
Specify Files}.
Each time you start your program with @code{run}, the inferior will be
initialized with the current working directory specified by the
@kbd{set cwd} command. If no directory has been specified by this
command, then the inferior will inherit @value{GDBN}'s current working
directory as its working directory.
@table @code
@kindex set cwd
@cindex change inferior's working directory
@anchor{set cwd command}
@item set cwd @r{[}@var{directory}@r{]}
Set the inferior's working directory to @var{directory}, which will be
@code{glob}-expanded in order to resolve tildes (@file{~}). If no
argument has been specified, the command clears the setting and resets
it to an empty state. This setting has no effect on @value{GDBN}'s
working directory, and it only takes effect the next time you start
the inferior. The @file{~} in @var{directory} is a short for the
@dfn{home directory}, usually pointed to by the @env{HOME} environment
variable. On MS-Windows, if @env{HOME} is not defined, @value{GDBN}
uses the concatenation of @env{HOMEDRIVE} and @env{HOMEPATH} as
fallback.
You can also change @value{GDBN}'s current working directory by using
the @code{cd} command.
@xref{cd command}
@kindex show cwd
@cindex show inferior's working directory
@item show cwd
Show the inferior's working directory. If no directory has been
specified by @kbd{set cwd}, then the default inferior's working
directory is the same as @value{GDBN}'s working directory.
@kindex cd
@cindex change working directory
@cindex change @value{GDBN}'s working directory
@anchor{cd command}
@item cd @r{[}@var{directory}@r{]}
Set the @value{GDBN} working directory to @var{directory}. If not
given, @var{directory} uses @file{'~'}.
The @value{GDBN} working directory serves as a default for the
commands that specify files for @value{GDBN} to operate on.
@xref{Files, ,Commands to Specify Files}.
@xref{set cwd command}
@kindex pwd
@item pwd
Print the @value{GDBN} working directory.

6
gdb/gdbserver/ChangeLog
View file

@ -1,3 +1,9 @@
2017-10-04 Sergio Durigan Junior <sergiodj@redhat.com>
* inferiors.c (current_inferior_cwd): New global variable.
(get_inferior_cwd): New function.
* inferiors.h (struct process_info) <cwd>: New field.
2017-10-04 Sergio Durigan Junior <sergiodj@redhat.com>
* Makefile.in (SFILES): Add $(srcdir)/common/gdb_tilde_expand.c.

11
gdb/gdbserver/inferiors.c
View file

@ -29,6 +29,9 @@ struct thread_info *current_thread;
#define get_thread(inf) ((struct thread_info *)(inf))
/* The current working directory used to start the inferior. */
static const char *current_inferior_cwd = NULL;
void
add_inferior_to_list (struct inferior_list *list,
struct inferior_list_entry *new_inferior)
@ -445,3 +448,11 @@ switch_to_thread (ptid_t ptid)
gdb_assert (ptid != minus_one_ptid);
current_thread = find_thread_ptid (ptid);
}
/* See common/common-inferior.h. */
const char *
get_inferior_cwd ()
{
return current_inferior_cwd;
}

77
gdb/infcmd.c
View file

@ -103,6 +103,10 @@ static void run_command (char *, int);
static char *inferior_args_scratch;
/* Scratch area where the new cwd will be stored by 'set cwd'. */
static char *inferior_cwd_scratch;
/* Scratch area where 'set inferior-tty' will store user-provided value.
We'll immediate copy it into per-inferior storage. */
@ -238,6 +242,60 @@ show_args_command (struct ui_file *file, int from_tty,
deprecated_show_value_hack (file, from_tty, c, get_inferior_args ());
}
/* Set the inferior current working directory. If CWD is NULL, unset
the directory. */
static void
set_inferior_cwd (const char *cwd)
{
struct inferior *inf = current_inferior ();
gdb_assert (inf != NULL);
if (cwd == NULL)
inf->cwd.reset ();
else
inf->cwd.reset (xstrdup (cwd));
}
/* See common/common-inferior.h. */
const char *
get_inferior_cwd ()
{
return current_inferior ()->cwd.get ();
}
/* Handle the 'set cwd' command. */
static void
set_cwd_command (char *args, int from_tty, struct cmd_list_element *c)
{
if (*inferior_cwd_scratch == '\0')
set_inferior_cwd (NULL);
else
set_inferior_cwd (inferior_cwd_scratch);
}
/* Handle the 'show cwd' command. */
static void
show_cwd_command (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
const char *cwd = get_inferior_cwd ();
if (cwd == NULL)
fprintf_filtered (gdb_stdout,
_("\
You have not set the inferior's current working directory.\n\
The inferior will inherit GDB's cwd.\n"));
else
fprintf_filtered (gdb_stdout,
_("Current working directory that will be used "
"when starting the inferior is \"%s\".\n"), cwd);
}
/* Compute command-line string given argument vector. This does the
same shell processing as fork_inferior. */
@ -3253,6 +3311,25 @@ Follow this command with any number of args, to be passed to the program."),
gdb_assert (c != NULL);
set_cmd_completer (c, filename_completer);
cmd_name = "cwd";
add_setshow_string_noescape_cmd (cmd_name, class_run,
&inferior_cwd_scratch, _("\
Set the current working directory to be used when the inferior is started.\n\
Changing this setting does not have any effect on inferiors that are\n\
already running."),
_("\
Show the current working directory that is used when the inferior is started."),
_("\
Use this command to change the current working directory that will be used\n\
when the inferior is started. This setting does not affect GDB's current\n\
working directory."),
set_cwd_command,
show_cwd_command,
&setlist, &showlist);
c = lookup_cmd (&cmd_name, setlist, "", -1, 1);
gdb_assert (c != NULL);
set_cmd_completer (c, filename_completer);
c = add_cmd ("environment", no_class, environment_info, _("\
The environment to give the program, or one variable's value.\n\
With an argument VAR, prints the value of environment variable VAR to\n\

4
gdb/inferior.h
View file

@ -355,6 +355,10 @@ public:
should never be freed. */
char **argv = NULL;
/* The current working directory that will be used when starting
this inferior. */
gdb::unique_xmalloc_ptr<char> cwd;
/* The name of terminal device to use for I/O. */
char *terminal = NULL;

23
gdb/nat/fork-inferior.c
View file

@ -25,6 +25,7 @@
#include "common-inferior.h"
#include "common-gdbthread.h"
#include "signals-state-save-restore.h"
#include "gdb_tilde_expand.h"
#include <vector>
extern char **environ;
@ -298,6 +299,8 @@ fork_inferior (const char *exec_file_arg, const std::string &allargs,
char **save_our_env;
int i;
int save_errno;
const char *inferior_cwd;
std::string expanded_inferior_cwd;
/* If no exec file handed to us, get it from the exec-file command
-- with a good, common error message if none is specified. */
@ -339,6 +342,18 @@ fork_inferior (const char *exec_file_arg, const std::string &allargs,
the parent and child flushing the same data after the fork. */
gdb_flush_out_err ();
/* Check if the user wants to set a different working directory for
the inferior. */
inferior_cwd = get_inferior_cwd ();
if (inferior_cwd != NULL)
{
/* Expand before forking because between fork and exec, the child
process may only execute async-signal-safe operations. */
expanded_inferior_cwd = gdb_tilde_expand (inferior_cwd);
inferior_cwd = expanded_inferior_cwd.c_str ();
}
/* If there's any initialization of the target layers that must
happen to prepare to handle the child we're about fork, do it
now... */
@ -374,6 +389,14 @@ fork_inferior (const char *exec_file_arg, const std::string &allargs,
UIs. */
close_most_fds ();
/* Change to the requested working directory if the user
requested it. */
if (inferior_cwd != NULL)
{
if (chdir (inferior_cwd) < 0)
trace_start_error_with_name (inferior_cwd);
}
if (debug_fork)
sleep (debug_fork);

5
gdb/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2017-10-04 Sergio Durigan Junior <sergiodj@redhat.com>
* gdb.base/set-cwd.c: New file.
* gdb.base/set-cwd.exp: Likewise.
2017-10-02 Tom Tromey <tom@tromey.com>
PR rust/22236:

31
gdb/testsuite/gdb.base/set-cwd.c Normal file
View file

@ -0,0 +1,31 @@
/* This testcase is part of GDB, the GNU debugger.
Copyright 2017 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/>. */
#include <stdlib.h>
#include <unistd.h>
static char dir[4096];
int
main (int argc, char *argv[])
{
const char *home = getenv ("HOME");
getcwd (dir, 4096);
return 0; /* break-here */
}

197
gdb/testsuite/gdb.base/set-cwd.exp Normal file
View file

@ -0,0 +1,197 @@
# This testcase is part of GDB, the GNU debugger.
# Copyright 2017 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/>.
if { [use_gdb_stub] || [target_info gdb_protocol] == "extended-remote" } {
untested "not implemented on remote servers"
return
}
standard_testfile
if { [prepare_for_testing "failed to prepare" $testfile $srcfile debug] } {
return -1
}
# Test that tilde expansion works fine.
proc_with_prefix test_tilde_expansion { } {
global decimal gdb_prompt hex
gdb_test_no_output "set cwd ~/" "set inferior cwd to ~/ dir"
if { ![runto_main] } {
untested "could not run to main"
return -1
}
gdb_breakpoint [gdb_get_line_number "break-here"]
gdb_continue_to_breakpoint "break-here" ".* break-here .*"
set home ""
set test "print home var"
gdb_test_multiple "print home" $test {
-re "\\\$$decimal = $hex \"\(.+\)\"\r\n$gdb_prompt $" {
set home $expect_out(1,string)
pass $test
}
}
if { $home == "" } {
untested "could not retrieve home var"
return
}
set curdir ""
set test "print dir var"
gdb_test_multiple "print dir" $test {
-re "\\\$$decimal = \"\(.+\)\"\(, .*repeats.*\)?\r\n$gdb_prompt $" {
set curdir $expect_out(1,string)
pass $test
}
}
if { $curdir == "" } {
untested "could not retrieve dir var"
return
}
gdb_assert [string equal $curdir $home] \
"successfully chdir'd into home"
}
# The temporary directory that we will use to start the inferior.
set tmpdir [standard_output_file ""]
# Test that when we "set cwd" the inferior will be started under the
# correct working directory and GDB will not be affected by this.
proc_with_prefix test_cd_into_dir { } {
global decimal gdb_prompt tmpdir
set gdb_cwd_before_run ""
set test "pwd before run"
gdb_test_multiple "pwd" $test {
-re "Working directory \(.*\)\.\r\n$gdb_prompt $" {
set gdb_cwd_before_run $expect_out(1,string)
pass $test
}
}
if { $gdb_cwd_before_run == "" } {
untested "could not obtain GDB cwd before run"
return
}
# This test only makes sense if $tmpdir != $gdb_cwd_before_run
if { ![gdb_assert ![string equal $tmpdir $gdb_cwd_before_run] \
"make sure that tmpdir and GDB's cwd are different"] } {
return -1
}
gdb_test_no_output "set cwd $tmpdir" "set inferior cwd to temp dir"
if { ![runto_main] } {
untested "could not run to main"
return -1
}
gdb_breakpoint [gdb_get_line_number "break-here"]
gdb_continue_to_breakpoint "break-here" ".* break-here .*"
gdb_test "print dir" "\\\$$decimal = \"$tmpdir\", .*" \
"inferior cwd is correctly set"
set gdb_cwd_after_run ""
set test "pwd after run"
gdb_test_multiple "pwd" $test {
-re "Working directory \(.*\)\.\r\n$gdb_prompt $" {
set gdb_cwd_after_run $expect_out(1,string)
pass $test
}
}
if { $gdb_cwd_after_run == "" } {
untested "could not obtain GDB cwd after run"
return
}
gdb_assert [string equal $gdb_cwd_before_run $gdb_cwd_after_run] \
"GDB cwd is unchanged after running inferior"
}
# Test that executing "set cwd" without arguments will reset the
# inferior's cwd setting to its previous state.
proc_with_prefix test_cwd_reset { } {
global decimal gdb_prompt tmpdir
set gdb_cwd ""
set test "GDB cwd"
gdb_test_multiple "pwd" $test {
-re "Working directory \(.*\)\.\r\n$gdb_prompt $" {
set gdb_cwd $expect_out(1,string)
}
}
if { $gdb_cwd == "" } {
untested "could not obtain GDB cwd"
return
}
# This test only makes sense if $tmpdir != $gdb_cwd.
if { ![gdb_assert ![string equal $tmpdir $gdb_cwd] \
"make sure that tmpdir and GDB's cwd are different"] } {
return -1
}
gdb_test_no_output "set cwd $tmpdir" "set inferior cwd to temp dir"
with_test_prefix "running with set cwd" {
if { ![runto_main] } {
untested "could not run to main"
return -1
}
}
gdb_breakpoint [gdb_get_line_number "break-here"]
gdb_continue_to_breakpoint "break-here" ".* break-here .*"
gdb_test "print dir" "\\\$$decimal = \"$tmpdir\", .*" \
"inferior cwd is correctly set"
# Reset the inferior's cwd.
gdb_test_no_output "set cwd" "resetting inferior cwd"
with_test_prefix "running without set cwd" {
if { ![runto_main] } {
untested "could not run to main"
return -1
}
}
gdb_breakpoint [gdb_get_line_number "break-here"]
gdb_continue_to_breakpoint "break-here" ".* break-here .*"
gdb_test "print dir" "\\\$$decimal = \"$gdb_cwd\", .*" \
"inferior cwd got reset correctly"
}
test_cd_into_dir
clean_restart $binfile
test_tilde_expansion
clean_restart $binfile
test_cwd_reset

23
gdb/windows-nat.c
View file

@ -66,6 +66,7 @@
#include "x86-nat.h"
#include "complaints.h"
#include "inf-child.h"
#include "gdb_tilde_expand.h"
#define AdjustTokenPrivileges dyn_AdjustTokenPrivileges
#define DebugActiveProcessStop dyn_DebugActiveProcessStop
@ -2428,6 +2429,7 @@ windows_create_inferior (struct target_ops *ops, const char *exec_file,
#ifdef __CYGWIN__
cygwin_buf_t real_path[__PMAX];
cygwin_buf_t shell[__PMAX]; /* Path to shell */
cygwin_buf_t infcwd[__PMAX];
const char *sh;
cygwin_buf_t *toexec;
cygwin_buf_t *cygallargs;
@ -2465,6 +2467,17 @@ windows_create_inferior (struct target_ops *ops, const char *exec_file,
if (!exec_file)
error (_("No executable specified, use `target exec'."));
const char *inferior_cwd = get_inferior_cwd ();
std::string expanded_infcwd;
if (inferior_cwd != NULL)
{
expanded_infcwd = gdb_tilde_expand (inferior_cwd);
/* Mirror slashes on inferior's cwd. */
std::replace (expanded_infcwd.begin (), expanded_infcwd.end (),
'/', '\\');
inferior_cwd = expanded_infcwd.c_str ();
}
memset (&si, 0, sizeof (si));
si.cb = sizeof (si);
@ -2514,6 +2527,11 @@ windows_create_inferior (struct target_ops *ops, const char *exec_file,
flags |= DEBUG_PROCESS;
}
if (inferior_cwd != NULL
&& cygwin_conv_path (CCP_POSIX_TO_WIN_W, inferior_cwd,
infcwd, strlen (inferior_cwd)) < 0)
error (_("Error converting inferior cwd: %d"), errno);
#ifdef __USEWIDE
args = (cygwin_buf_t *) alloca ((wcslen (toexec) + wcslen (cygallargs) + 2)
* sizeof (wchar_t));
@ -2574,7 +2592,8 @@ windows_create_inferior (struct target_ops *ops, const char *exec_file,
TRUE, /* inherit handles */
flags, /* start flags */
w32_env, /* environment */
NULL, /* current directory */
inferior_cwd != NULL ? infcwd : NULL, /* current
directory */
&si,
&pi);
if (w32_env)
@ -2697,7 +2716,7 @@ windows_create_inferior (struct target_ops *ops, const char *exec_file,
TRUE, /* inherit handles */
flags, /* start flags */
w32env, /* environment */
NULL, /* current directory */
inferior_cwd, /* current directory */
&si,
&pi);
if (tty != INVALID_HANDLE_VALUE)