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C++ify gdb/common/environ.c

Browse Source 
As part of the preparation necessary for my upcoming task, I'd like to
propose that we turn gdb_environ into a class.  The approach taken
here is simple: the class gdb_environ contains everything that is
needed to manipulate the environment variables.  These variables are
stored in an std::vector<char *>, which can be converted to a 'char
**' and passed as argument to functions that need it.

The usage has not changed much.  As per Pedro's suggestion, this class
uses a static factory method initialization.  This means that when an
instance is created, it is initially empty.  When needed, it has to be
initialized using the static method 'from_host_environ'.

As mentioned before, this is a preparation for an upcoming work that I
will be posting in the next few weeks or so.  For that work, I'll
probably create another data structure that will contain all the
environment variables that were set by the user using the 'set
environment' command, because I'll need access to them.  This will be
much easier with the class-ification of gdb_environ.

As noted, this has been regression-tested with the new version of
environ.exp and no regressions were found.

gdb/ChangeLog:
2017-06-20  Sergio Durigan Junior  <sergiodj@redhat.com>

	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
	'unittests/environ-selftests.c'.
	(SUBDIR_UNITTESTS_OBS): Add 'environ-selftests.o'.
	* charset.c (find_charset_names): Declare object 'iconv_env'.
	Update code to use 'iconv_env' object.  Remove call to
	'free_environ'.
	* common/environ.c: Include <utility>.
	(make_environ): Delete function.
	(free_environ): Delete function.
	(gdb_environ::clear): New function.
	(gdb_environ::operator=): New function.
	(gdb_environ::get): Likewise.
	(environ_vector): Delete function.
	(set_in_environ): Delete function.
	(gdb_environ::set): New function.
	(unset_in_environ): Delete function.
	(gdb_environ::unset): New function.
	(gdb_environ::envp): Likewise.
	* common/environ.h: Include <vector>.
	(struct gdb_environ): Delete; transform into...
	(class gdb_environ): ... this class.
	(free_environ): Delete prototype.
	(init_environ, get_in_environ, set_in_environ, unset_in_environ,
	environ_vector): Likewise.
	* infcmd.c (run_command_1): Update code to call
	'envp' from 'gdb_environ' class.
	(environment_info): Update code to call methods from 'gdb_environ'
	class.
	(unset_environment_command): Likewise.
	(path_info): Likewise.
	(path_command): Likewise.
	* inferior.c (inferior::~inferior): Delete call to 'free_environ'.
	(inferior::inferior): Initialize 'environment' using the host's
	information.
	* inferior.h: Remove forward declaration of 'struct gdb_environ'.
	Include "environ.h".
	(class inferior) <environment>: Change type from 'struct
	gdb_environ' to 'gdb_environ'.
	* mi/mi-cmd-env.c (mi_cmd_env_path): Update code to call
	methods from 'gdb_environ' class.
	* solib.c (solib_find_1): Likewise
	* unittests/environ-selftests.c: New file.

gdb/gdbserver/ChangeLog:
2017-06-20  Sergio Durigan Junior  <sergiodj@redhat.com>

	* linux-low.c (linux_create_inferior): Adjust code to access the
	environment information via 'gdb_environ' class.
	* lynx-low.c (lynx_create_inferior): Likewise.
	* server.c (our_environ): Make it an instance of 'gdb_environ'.
	(get_environ): Return a pointer to 'our_environ'.
	(captured_main): Initialize 'our_environ'.
	* server.h (get_environ): Adjust prototype.
	* spu-low.c (spu_create_inferior): Adjust code to access the
	environment information via 'gdb_environ' class.
This commit is contained in:
Sergio Durigan Junior 2017-02-10 21:19:44 -05:00
parent 75c554cf9c
commit 9a6c7d9c02
17 changed files with 391 additions and 204 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
gdb/ChangeLog
View File

@ -1,3 +1,48 @@
2017-06-20 Sergio Durigan Junior <sergiodj@redhat.com>
* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
'unittests/environ-selftests.c'.
(SUBDIR_UNITTESTS_OBS): Add 'environ-selftests.o'.
* charset.c (find_charset_names): Declare object 'iconv_env'.
Update code to use 'iconv_env' object. Remove call to
'free_environ'.
* common/environ.c: Include <utility>.
(make_environ): Delete function.
(free_environ): Delete function.
(gdb_environ::clear): New function.
(gdb_environ::operator=): New function.
(gdb_environ::get): Likewise.
(environ_vector): Delete function.
(set_in_environ): Delete function.
(gdb_environ::set): New function.
(unset_in_environ): Delete function.
(gdb_environ::unset): New function.
(gdb_environ::envp): Likewise.
* common/environ.h: Include <vector>.
(struct gdb_environ): Delete; transform into...
(class gdb_environ): ... this class.
(free_environ): Delete prototype.
(init_environ, get_in_environ, set_in_environ, unset_in_environ,
environ_vector): Likewise.
* infcmd.c (run_command_1): Update code to call
'envp' from 'gdb_environ' class.
(environment_info): Update code to call methods from 'gdb_environ'
class.
(unset_environment_command): Likewise.
(path_info): Likewise.
(path_command): Likewise.
* inferior.c (inferior::~inferior): Delete call to 'free_environ'.
(inferior::inferior): Initialize 'environment' using the host's
information.
* inferior.h: Remove forward declaration of 'struct gdb_environ'.
Include "environ.h".
(class inferior) <environment>: Change type from 'struct
gdb_environ' to 'gdb_environ'.
* mi/mi-cmd-env.c (mi_cmd_env_path): Update code to call
methods from 'gdb_environ' class.
* solib.c (solib_find_1): Likewise
* unittests/environ-selftests.c: New file.
2017-06-20 Yao Qi <yao.qi@linaro.org>
* features/i386/i386-linux.xml: Exchange the order of including

2
gdb/Makefile.in
View File

@ -526,6 +526,7 @@ SUBDIR_PYTHON_LDFLAGS =
SUBDIR_PYTHON_CFLAGS =
SUBDIR_UNITTESTS_SRCS = \
unittests/environ-selftests.c \
unittests/function-view-selftests.c \
unittests/offset-type-selftests.c \
unittests/optional-selftests.c \
@ -533,6 +534,7 @@ SUBDIR_UNITTESTS_SRCS = \
unittests/scoped_restore-selftests.c
SUBDIR_UNITTESTS_OBS = \
environ-selftests.o \
function-view-selftests.o \
offset-type-selftests.o \
optional-selftests.o \

11
gdb/charset.c
View File

@ -794,16 +794,14 @@ find_charset_names (void)
int err, status;
int fail = 1;
int flags;
struct gdb_environ *iconv_env;
gdb_environ iconv_env = gdb_environ::from_host_environ ();
char *iconv_program;
/* Older iconvs, e.g. 2.2.2, don't omit the intro text if stdout is
not a tty. We need to recognize it and ignore it. This text is
subject to translation, so force LANGUAGE=C. */
iconv_env = make_environ ();
init_environ (iconv_env);
set_in_environ (iconv_env, "LANGUAGE", "C");
set_in_environ (iconv_env, "LC_ALL", "C");
iconv_env.set ("LANGUAGE", "C");
iconv_env.set ("LC_ALL", "C");
child = pex_init (PEX_USE_PIPES, "iconv", NULL);
@ -827,7 +825,7 @@ find_charset_names (void)
/* Note that we simply ignore errors here. */
if (!pex_run_in_environment (child, flags,
args[0], const_cast<char **> (args),
environ_vector (iconv_env),
iconv_env.envp (),
NULL, NULL, &err))
{
FILE *in = pex_read_output (child, 0);
@ -901,7 +899,6 @@ find_charset_names (void)
xfree (iconv_program);
pex_free (child);
free_environ (iconv_env);
if (fail)
{

232
gdb/common/environ.c
View File

@ -18,165 +18,119 @@
#include "common-defs.h"
#include "environ.h"
#include <algorithm>
#include <utility>
/* Return a new environment object. */
/* See common/environ.h. */
struct gdb_environ *
make_environ (void)
gdb_environ &
gdb_environ::operator= (gdb_environ &&e)
{
struct gdb_environ *e;
/* Are we self-moving? */
if (&e == this)
return *this;
e = XNEW (struct gdb_environ);
m_environ_vector = std::move (e.m_environ_vector);
e.m_environ_vector.clear ();
e.m_environ_vector.push_back (NULL);
return *this;
}
/* See common/environ.h. */
gdb_environ gdb_environ::from_host_environ ()
{
extern char **environ;
gdb_environ e;
if (environ == NULL)
return e;
for (int i = 0; environ[i] != NULL; ++i)
{
/* Make sure we add the element before the last (NULL). */
e.m_environ_vector.insert (e.m_environ_vector.end () - 1,
xstrdup (environ[i]));
}
e->allocated = 10;
e->vector = (char **) xmalloc ((e->allocated + 1) * sizeof (char *));
e->vector[0] = 0;
return e;
}
/* Free an environment and all the strings in it. */
/* See common/environ.h. */
void
free_environ (struct gdb_environ *e)
gdb_environ::clear ()
{
char **vector = e->vector;
while (*vector)
xfree (*vector++);
xfree (e->vector);
xfree (e);
for (char *v : m_environ_vector)
xfree (v);
m_environ_vector.clear ();
/* Always add the NULL element. */
m_environ_vector.push_back (NULL);
}
/* Copy the environment given to this process into E.
Also copies all the strings in it, so we can be sure
that all strings in these environments are safe to free. */
/* Helper function to check if STRING contains an environment variable
assignment of VAR, i.e., if STRING starts with 'VAR='. Return true
if it contains, false otherwise. */
static bool
match_var_in_string (char *string, const char *var, size_t var_len)
{
if (strncmp (string, var, var_len) == 0 && string[var_len] == '=')
return true;
return false;
}
/* See common/environ.h. */
const char *
gdb_environ::get (const char *var) const
{
size_t len = strlen (var);
for (char *el : m_environ_vector)
if (el != NULL && match_var_in_string (el, var, len))
return &el[len + 1];
return NULL;
}
/* See common/environ.h. */
void
init_environ (struct gdb_environ *e)
gdb_environ::set (const char *var, const char *value)
{
extern char **environ;
int i;
/* We have to unset the variable in the vector if it exists. */
unset (var);
if (environ == NULL)
return;
for (i = 0; environ[i]; i++) /*EMPTY */ ;
if (e->allocated < i)
{
e->allocated = std::max (i, e->allocated + 10);
e->vector = (char **) xrealloc ((char *) e->vector,
(e->allocated + 1) * sizeof (char *));
}
memcpy (e->vector, environ, (i + 1) * sizeof (char *));
while (--i >= 0)
{
int len = strlen (e->vector[i]);
char *newobj = (char *) xmalloc (len + 1);
memcpy (newobj, e->vector[i], len + 1);
e->vector[i] = newobj;
}
/* Insert the element before the last one, which is always NULL. */
m_environ_vector.insert (m_environ_vector.end () - 1,
concat (var, "=", value, NULL));
}
/* Return the vector of environment E.
This is used to get something to pass to execve. */
/* See common/environ.h. */
void
gdb_environ::unset (const char *var)
{
size_t len = strlen (var);
/* We iterate until '.cend () - 1' because the last element is
always NULL. */
for (std::vector<char *>::const_iterator el = m_environ_vector.cbegin ();
el != m_environ_vector.cend () - 1;
++el)
if (match_var_in_string (*el, var, len))
{
xfree (*el);
m_environ_vector.erase (el);
break;
}
}
/* See common/environ.h. */
char **
environ_vector (struct gdb_environ *e)
gdb_environ::envp () const
{
return e->vector;
}
/* Return the value in environment E of variable VAR. */
char *
get_in_environ (const struct gdb_environ *e, const char *var)
{
int len = strlen (var);
char **vector = e->vector;
char *s;
for (; (s = *vector) != NULL; vector++)
if (strncmp (s, var, len) == 0 && s[len] == '=')
return &s[len + 1];
return 0;
}
/* Store the value in E of VAR as VALUE. */
void
set_in_environ (struct gdb_environ *e, const char *var, const char *value)
{
int i;
int len = strlen (var);
char **vector = e->vector;
char *s;
for (i = 0; (s = vector[i]) != NULL; i++)
if (strncmp (s, var, len) == 0 && s[len] == '=')
break;
if (s == 0)
{
if (i == e->allocated)
{
e->allocated += 10;
vector = (char **) xrealloc ((char *) vector,
(e->allocated + 1) * sizeof (char *));
e->vector = vector;
}
vector[i + 1] = 0;
}
else
xfree (s);
s = (char *) xmalloc (len + strlen (value) + 2);
strcpy (s, var);
strcat (s, "=");
strcat (s, value);
vector[i] = s;
/* This used to handle setting the PATH and GNUTARGET variables
specially. The latter has been replaced by "set gnutarget"
(which has worked since GDB 4.11). The former affects searching
the PATH to find SHELL, and searching the PATH to find the
argument of "symbol-file" or "exec-file". Maybe we should have
some kind of "set exec-path" for that. But in any event, having
"set env" affect anything besides the inferior is a bad idea.
What if we want to change the environment we pass to the program
without afecting GDB's behavior? */
return;
}
/* Remove the setting for variable VAR from environment E. */
void
unset_in_environ (struct gdb_environ *e, const char *var)
{
int len = strlen (var);
char **vector = e->vector;
char *s;
for (; (s = *vector) != NULL; vector++)
{
if (strncmp (s, var, len) == 0 && s[len] == '=')
{
xfree (s);
/* Walk through the vector, shuffling args down by one, including
the NULL terminator. Can't use memcpy() here since the regions
overlap, and memmove() might not be available. */
while ((vector[0] = vector[1]) != NULL)
{
vector++;
}
break;
}
}
return const_cast<char **> (&m_environ_vector[0]);
}

70
gdb/common/environ.h
View File

@ -17,33 +17,65 @@
#if !defined (ENVIRON_H)
#define ENVIRON_H 1
/* We manipulate environments represented as these structures. */
#include <vector>
struct gdb_environ
/* Class that represents the environment variables as seen by the
inferior. */
class gdb_environ
{
public:
/* Regular constructor and destructor. */
gdb_environ ()
{
/* Number of usable slots allocated in VECTOR.
VECTOR always has one slot not counted here,
to hold the terminating zero. */
int allocated;
/* A vector of slots, ALLOCATED + 1 of them.
The first few slots contain strings "VAR=VALUE"
and the next one contains zero.
Then come some unused slots. */
char **vector;
};
/* Make sure that the vector contains at least a NULL element.
If/when we add more variables to it, NULL will always be the
last element. */
m_environ_vector.push_back (NULL);
}
extern struct gdb_environ *make_environ (void);
~gdb_environ ()
{
clear ();
}
extern void free_environ (struct gdb_environ *);
/* Move constructor. */
gdb_environ (gdb_environ &&e)
: m_environ_vector (std::move (e.m_environ_vector))
{
/* Make sure that the moved-from vector is left at a valid
state (only one NULL element). */
e.m_environ_vector.clear ();
e.m_environ_vector.push_back (NULL);
}
extern void init_environ (struct gdb_environ *);
/* Move assignment. */
gdb_environ &operator= (gdb_environ &&e);
extern char *get_in_environ (const struct gdb_environ *, const char *);
/* Create a gdb_environ object using the host's environment
variables. */
static gdb_environ from_host_environ ();
extern void set_in_environ (struct gdb_environ *, const char *, const char *);
/* Clear the environment variables stored in the object. */
void clear ();
extern void unset_in_environ (struct gdb_environ *, const char *);
/* Return the value in the environment for the variable VAR. The
returned pointer is only valid as long as the gdb_environ object
is not modified. */
const char *get (const char *var) const;
extern char **environ_vector (struct gdb_environ *);
/* Store VAR=VALUE in the environment. */
void set (const char *var, const char *value);
/* Unset VAR in environment. */
void unset (const char *var);
/* Return the environment vector represented as a 'char **'. */
char **envp () const;
private:
/* A vector containing the environment variables. */
std::vector<char *> m_environ_vector;
};
#endif /* defined (ENVIRON_H) */

12
gdb/gdbserver/ChangeLog
View File

@ -1,3 +1,15 @@
2017-06-20 Sergio Durigan Junior <sergiodj@redhat.com>
* linux-low.c (linux_create_inferior): Adjust code to access the
environment information via 'gdb_environ' class.
* lynx-low.c (lynx_create_inferior): Likewise.
* server.c (our_environ): Make it an instance of 'gdb_environ'.
(get_environ): Return a pointer to 'our_environ'.
(captured_main): Initialize 'our_environ'.
* server.h (get_environ): Adjust prototype.
* spu-low.c (spu_create_inferior): Adjust code to access the
environment information via 'gdb_environ' class.
2017-06-17 Simon Marchi <simon.marchi@ericsson.com>
* linux-low.c (linux_read_memory, linux_write_memory): Remove

2
gdb/gdbserver/linux-low.c
View File

@ -998,7 +998,7 @@ linux_create_inferior (const char *program,
pid = fork_inferior (program,
str_program_args.c_str (),
environ_vector (get_environ ()), linux_ptrace_fun,
get_environ ()->envp (), linux_ptrace_fun,
NULL, NULL, NULL, NULL);
do_cleanups (restore_personality);

2
gdb/gdbserver/lynx-low.c
View File

@ -259,7 +259,7 @@ lynx_create_inferior (const char *program,
pid = fork_inferior (program,
str_program_args.c_str (),
environ_vector (get_environ ()), lynx_ptrace_fun,
get_environ ()->envp (), lynx_ptrace_fun,
NULL, NULL, NULL, NULL);
post_fork_inferior (pid, program);

9
gdb/gdbserver/server.c
View File

@ -42,7 +42,7 @@
/* The environment to pass to the inferior when creating it. */
struct gdb_environ *our_environ = NULL;
static gdb_environ our_environ;
/* Start the inferior using a shell. */
@ -257,10 +257,10 @@ get_exec_file (int err)
/* See server.h. */
struct gdb_environ *
gdb_environ *
get_environ ()
{
return our_environ;
return &our_environ;
}
static int
@ -3698,8 +3698,7 @@ captured_main (int argc, char *argv[])
}
/* Gather information about the environment. */
our_environ = make_environ ();
init_environ (our_environ);
our_environ = gdb_environ::from_host_environ ();
initialize_async_io ();
initialize_low ();

6
gdb/gdbserver/server.h
View File

@ -62,6 +62,7 @@ int vsnprintf(char *str, size_t size, const char *format, va_list ap);
#include "mem-break.h"
#include "gdbthread.h"
#include "inferiors.h"
#include "environ.h"
/* Target-specific functions */
@ -154,9 +155,8 @@ extern int in_queued_stop_replies (ptid_t ptid);
inferior and PROGRAM is its name. */
extern void post_fork_inferior (int pid, const char *program);
/* Get the 'struct gdb_environ *' being used in the current
session. */
extern struct gdb_environ *get_environ ();
/* Get the gdb_environ being used in the current session. */
extern gdb_environ *get_environ ();
extern target_waitstatus last_status;
extern ptid_t last_ptid;

2
gdb/gdbserver/spu-low.c
View File

@ -289,7 +289,7 @@ spu_create_inferior (const char *program,
pid = fork_inferior (program,
str_program_args.c_str (),
environ_vector (get_environ ()), spu_ptrace_fun,
get_environ ()->envp (), spu_ptrace_fun,
NULL, NULL, NULL, NULL);
post_fork_inferior (pid, program);

28
gdb/infcmd.c
View File

@ -610,7 +610,7 @@ run_command_1 (char *args, int from_tty, int tbreak_at_main)
the value now. */
run_target->to_create_inferior (run_target, exec_file,
std::string (get_inferior_args ()),
environ_vector (current_inferior ()->environment),
current_inferior ()->environment.envp (),
from_tty);
/* to_create_inferior should push the target, so after this point we
shouldn't refer to run_target again. */
@ -2131,7 +2131,7 @@ environment_info (char *var, int from_tty)
{
if (var)
{
char *val = get_in_environ (current_inferior ()->environment, var);
const char *val = current_inferior ()->environment.get (var);
if (val)
{
@ -2149,11 +2149,11 @@ environment_info (char *var, int from_tty)
}
else
{
char **vector = environ_vector (current_inferior ()->environment);
char **envp = current_inferior ()->environment.envp ();
while (*vector)
for (int idx = 0; envp[idx] != NULL; ++idx)
{
puts_filtered (*vector++);
puts_filtered (envp[idx]);
puts_filtered ("\n");
}
}
@ -2215,10 +2215,10 @@ set_environment_command (char *arg, int from_tty)
printf_filtered (_("Setting environment variable "
"\"%s\" to null value.\n"),
var);
set_in_environ (current_inferior ()->environment, var, "");
current_inferior ()->environment.set (var, "");
}
else
set_in_environ (current_inferior ()->environment, var, val);
current_inferior ()->environment.set (var, val);
xfree (var);
}
@ -2230,13 +2230,10 @@ unset_environment_command (char *var, int from_tty)
/* If there is no argument, delete all environment variables.
Ask for confirmation if reading from the terminal. */
if (!from_tty || query (_("Delete all environment variables? ")))
{
free_environ (current_inferior ()->environment);
current_inferior ()->environment = make_environ ();
}
current_inferior ()->environment = gdb_environ::from_host_environ ();
}
else
unset_in_environ (current_inferior ()->environment, var);
current_inferior ()->environment.unset (var);
}
/* Handle the execution path (PATH variable). */
@ -2247,8 +2244,7 @@ static void
path_info (char *args, int from_tty)
{
puts_filtered ("Executable and object file path: ");
puts_filtered (get_in_environ (current_inferior ()->environment,
path_var_name));
puts_filtered (current_inferior ()->environment.get (path_var_name));
puts_filtered ("\n");
}
@ -2261,13 +2257,13 @@ path_command (char *dirname, int from_tty)
const char *env;
dont_repeat ();
env = get_in_environ (current_inferior ()->environment, path_var_name);
env = current_inferior ()->environment.get (path_var_name);
/* Can be null if path is not set. */
if (!env)
env = "";
exec_path = xstrdup (env);
mod_path (dirname, &exec_path);
set_in_environ (current_inferior ()->environment, path_var_name, exec_path);
current_inferior ()->environment.set (path_var_name, exec_path);
xfree (exec_path);
if (from_tty)
path_info ((char *) NULL, from_tty);

4
gdb/inferior.c
View File

@ -81,7 +81,6 @@ inferior::~inferior ()
inferior_free_data (inf);
xfree (inf->args);
xfree (inf->terminal);
free_environ (inf->environment);
target_desc_info_free (inf->tdesc_info);
xfree (inf->priv);
}
@ -89,10 +88,9 @@ inferior::~inferior ()
inferior::inferior (int pid_)
: num (++highest_inferior_num),
pid (pid_),
environment (make_environ ()),
environment (gdb_environ::from_host_environ ()),
registry_data ()
{
init_environ (this->environment);
inferior_alloc_data (this);
}

6
gdb/inferior.h
View File

@ -30,7 +30,6 @@ struct regcache;
struct ui_out;
struct terminal_info;
struct target_desc_info;
struct gdb_environ;
struct continuation;
struct inferior;
@ -43,6 +42,9 @@ struct inferior;
/* For struct frame_id. */
#include "frame.h"
/* For gdb_environ. */
#include "environ.h"
#include "progspace.h"
#include "registry.h"
@ -363,7 +365,7 @@ public:
/* Environment to use for running inferior,
in format described in environ.h. */
gdb_environ *environment = NULL;
gdb_environ environment;
/* True if this child process was attached rather than forked. */
bool attach_flag = false;

6
gdb/mi/mi-cmd-env.c
View File

@ -167,7 +167,7 @@ mi_cmd_env_path (const char *command, char **argv, int argc)
else
{
/* Otherwise, get current path to modify. */
env = get_in_environ (current_inferior ()->environment, path_var_name);
env = current_inferior ()->environment.get (path_var_name);
/* Can be null if path is not set. */
if (!env)
@ -178,9 +178,9 @@ mi_cmd_env_path (const char *command, char **argv, int argc)
for (i = argc - 1; i >= 0; --i)
env_mod_path (argv[i], &exec_path);
set_in_environ (current_inferior ()->environment, path_var_name, exec_path);
current_inferior ()->environment.set (path_var_name, exec_path);
xfree (exec_path);
env = get_in_environ (current_inferior ()->environment, path_var_name);
env = current_inferior ()->environment.get (path_var_name);
uiout->field_string ("path", env);
}

7
gdb/solib.c
View File

@ -350,16 +350,15 @@ solib_find_1 (const char *in_pathname, int *fd, int is_solib)
/* If not found, next search the inferior's $PATH environment variable. */
if (found_file < 0 && sysroot == NULL)
found_file = openp (get_in_environ (current_inferior ()->environment,
"PATH"),
found_file = openp (current_inferior ()->environment.get ("PATH"),
OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
O_RDONLY | O_BINARY, &temp_pathname);
/* If not found, and we're looking for a solib, next search the
inferior's $LD_LIBRARY_PATH environment variable. */
if (is_solib && found_file < 0 && sysroot == NULL)
found_file = openp (get_in_environ (current_inferior ()->environment,
"LD_LIBRARY_PATH"),
found_file = openp (current_inferior ()->environment.get
("LD_LIBRARY_PATH"),
OPF_TRY_CWD_FIRST | OPF_RETURN_REALPATH, in_pathname,
O_RDONLY | O_BINARY, &temp_pathname);

151
gdb/unittests/environ-selftests.c Normal file
View File

@ -0,0 +1,151 @@
/* Self tests for gdb_environ for GDB, the GNU debugger.
Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of GDB.
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 "defs.h"
#include "selftest.h"
#include "common/environ.h"
namespace selftests {
namespace gdb_environ_tests {
static void
run_tests ()
{
/* Set a test environment variable. This will be unset at the end
of this function. */
if (setenv ("GDB_SELFTEST_ENVIRON", "1", 1) != 0)
error (_("Could not set environment variable for testing."));
gdb_environ env;
/* When the vector is initialized, there should always be one NULL
element in it. */
SELF_CHECK (env.envp ()[0] == NULL);
/* Make sure that there is no other element. */
SELF_CHECK (env.get ("PWD") == NULL);
/* Check if unset followed by a set in an empty vector works. */
env.set ("PWD", "test");
SELF_CHECK (strcmp (env.get ("PWD"), "test") == 0);
/* The second element must be NULL. */
SELF_CHECK (env.envp ()[1] == NULL);
env.unset ("PWD");
SELF_CHECK (env.envp ()[0] == NULL);
/* Initialize the environment vector using the host's environ. */
env = gdb_environ::from_host_environ ();
/* Our test environment variable should be present at the
vector. */
SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON"), "1") == 0);
/* Set our test variable to another value. */
env.set ("GDB_SELFTEST_ENVIRON", "test");
SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON"), "test") == 0);
/* And unset our test variable. The variable still exists in the
host's environment, but doesn't exist in our vector. */
env.unset ("GDB_SELFTEST_ENVIRON");
SELF_CHECK (env.get ("GDB_SELFTEST_ENVIRON") == NULL);
/* Re-set the test variable. */
env.set ("GDB_SELFTEST_ENVIRON", "1");
SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON"), "1") == 0);
/* When we clear our environ vector, there should be only one
element on it (NULL), and we shouldn't be able to get our test
variable. */
env.clear ();
SELF_CHECK (env.envp ()[0] == NULL);
SELF_CHECK (env.get ("GDB_SELFTEST_ENVIRON") == NULL);
/* Reinitialize our environ vector using the host environ. We
should be able to see one (and only one) instance of the test
variable. */
env = gdb_environ::from_host_environ ();
char **envp = env.envp ();
int num_found = 0;
for (size_t i = 0; envp[i] != NULL; ++i)
if (strcmp (envp[i], "GDB_SELFTEST_ENVIRON=1") == 0)
++num_found;
SELF_CHECK (num_found == 1);
/* Get rid of our test variable. */
unsetenv ("GDB_SELFTEST_ENVIRON");
/* Test the case when we set a variable A, then set a variable B,
then unset A, and make sure that we cannot find A in the environ
vector, but can still find B. */
env.set ("GDB_SELFTEST_ENVIRON_1", "aaa");
SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON_1"), "aaa") == 0);
env.set ("GDB_SELFTEST_ENVIRON_2", "bbb");
SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON_2"), "bbb") == 0);
env.unset ("GDB_SELFTEST_ENVIRON_1");
SELF_CHECK (env.get ("GDB_SELFTEST_ENVIRON_1") == NULL);
SELF_CHECK (strcmp (env.get ("GDB_SELFTEST_ENVIRON_2"), "bbb") == 0);
env.clear ();
/* Test that after a std::move the moved-from object is left at a
valid state (i.e., its only element is NULL). */
env.set ("A", "1");
SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
gdb_environ env2;
env2 = std::move (env);
SELF_CHECK (env.envp ()[0] == NULL);
SELF_CHECK (strcmp (env2.get ("A"), "1") == 0);
SELF_CHECK (env2.envp ()[1] == NULL);
env.set ("B", "2");
SELF_CHECK (strcmp (env.get ("B"), "2") == 0);
SELF_CHECK (env.envp ()[1] == NULL);
/* Test that the move constructor leaves everything at a valid
state. */
env.clear ();
env.set ("A", "1");
SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
gdb_environ env3 = std::move (env);
SELF_CHECK (env.envp ()[0] == NULL);
SELF_CHECK (strcmp (env3.get ("A"), "1") == 0);
SELF_CHECK (env3.envp ()[1] == NULL);
env.set ("B", "2");
SELF_CHECK (strcmp (env.get ("B"), "2") == 0);
SELF_CHECK (env.envp ()[1] == NULL);
/* Test self-move. */
env.clear ();
env.set ("A", "1");
SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
env = std::move (env);
SELF_CHECK (strcmp (env.get ("A"), "1") == 0);
SELF_CHECK (strcmp (env.envp ()[0], "A=1") == 0);
SELF_CHECK (env.envp ()[1] == NULL);
}
} /* namespace gdb_environ */
} /* namespace selftests */
void
_initialize_environ_selftests ()
{
register_self_test (selftests::gdb_environ_tests::run_tests);
}