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Merge branch 'master' into 'master'

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Use posix_spawn for optimized process launching

See merge request GNOME/glib!95
This commit is contained in:
Philip Withnall
2018-06-21 17:10:43 +00:00
parent 6700101495 2b560457a0
commit ca98ce4280
16 changed files with 1042 additions and 186 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
configure.ac
View File

@@ -480,7 +480,7 @@ AM_CONDITIONAL(OS_WIN32_AND_DLL_COMPILATION, [test x$glib_native_win32 = xyes -a
# Checks for library functions.
AC_FUNC_ALLOCA
AC_CHECK_FUNCS(mmap posix_memalign memalign valloc fsync pipe2 issetugid)
AC_CHECK_FUNCS(timegm gmtime_r)
AC_CHECK_FUNCS(timegm gmtime_r posix_spawn)
AC_FUNC_STRERROR_R()
AC_CHECK_SIZEOF(char)

1
docs/reference/gio/gio-sections.txt
View File

@@ -1624,6 +1624,7 @@ g_desktop_app_info_get_boolean
g_desktop_app_info_has_key
GDesktopAppLaunchCallback
g_desktop_app_info_launch_uris_as_manager
g_desktop_app_info_launch_uris_as_manager_with_fds
<SUBSECTION>
g_desktop_app_info_list_actions
g_desktop_app_info_get_action_name

1
docs/reference/glib/glib-sections.txt
View File

@@ -1233,6 +1233,7 @@ GSpawnError
G_SPAWN_ERROR
GSpawnFlags
GSpawnChildSetupFunc
g_spawn_async_with_fds
g_spawn_async_with_pipes
g_spawn_async
g_spawn_sync

4
gio/Makefile.am
View File

@@ -819,7 +819,7 @@ gio.def: libgio-2.0.la
gio-2.0.lib: libgio-2.0.la gio.def
$(AM_V_GEN) lib.exe -machine:@LIB_EXE_MACHINE_FLAG@ -name:libgio-2.0-$(LT_CURRENT_MINUS_AGE).dll -def:$(builddir)/gio.def -out:$@
bin_PROGRAMS = gio-querymodules glib-compile-schemas glib-compile-resources gsettings
bin_PROGRAMS = gio-querymodules glib-compile-schemas glib-compile-resources gsettings gio-launch-desktop
glib_compile_resources_LDADD = libgio-2.0.la \
$(top_builddir)/gobject/libgobject-2.0.la \
@@ -840,6 +840,8 @@ gio_querymodules_LDADD = libgio-2.0.la \
$(top_builddir)/glib/libglib-2.0.la \
$(NULL)
gio_launch_desktop_SOURCES = gio-launch-desktop.c
gconstructor_as_data.h: $(top_srcdir)/glib/gconstructor.h data-to-c.py
$(AM_V_GEN) $(srcdir)/data-to-c.py $(top_srcdir)/glib/gconstructor.h gconstructor_code $@

205
gio/gdesktopappinfo.c
View File

@@ -155,6 +155,7 @@ static guint n_desktop_file_dirs;
static const guint desktop_file_dir_user_config_index = 0;
static guint desktop_file_dir_user_data_index;
static GMutex desktop_file_dir_lock;
static const gchar *gio_launch_desktop_path = NULL;
/* Monitor 'changed' signal handler {{{2 */
static void desktop_file_dir_reset (DesktopFileDir *dir);
@@ -2562,41 +2563,6 @@ create_files_for_uris (GList *uris)
return g_list_reverse (res);
}
typedef struct
{
GSpawnChildSetupFunc user_setup;
gpointer user_setup_data;
char *pid_envvar;
} ChildSetupData;
static void
child_setup (gpointer user_data)
{
ChildSetupData *data = user_data;
if (data->pid_envvar)
{
pid_t pid = getpid ();
char buf[20];
int i;
/* Write the pid into the space already reserved for it in the
* environment array. We can't use sprintf because it might
* malloc, so we do it by hand. It's simplest to write the pid
* out backwards first, then copy it over.
*/
for (i = 0; pid; i++, pid /= 10)
buf[i] = (pid % 10) + '0';
for (i--; i >= 0; i--)
*(data->pid_envvar++) = buf[i];
*data->pid_envvar = '\0';
}
if (data->user_setup)
data->user_setup (data->user_setup_data);
}
static void
notify_desktop_launch (GDBusConnection *session_bus,
GDesktopAppInfo *info,
@@ -2675,6 +2641,9 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo *info,
gpointer user_setup_data,
GDesktopAppLaunchCallback pid_callback,
gpointer pid_callback_data,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error)
{
gboolean completed = FALSE;
@@ -2683,7 +2652,6 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo *info,
char **argv, **envp;
int argc;
ChildSetupData data;
g_return_val_if_fail (info != NULL, FALSE);
@@ -2705,6 +2673,8 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo *info,
GList *launched_uris;
GList *iter;
char *sn_id = NULL;
char **wrapped_argv;
int i;
old_uris = dup_uris;
if (!expand_application_parameters (info, exec_line, &dup_uris, &argc, &argv, error))
@@ -2723,25 +2693,11 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo *info,
goto out;
}
data.user_setup = user_setup;
data.user_setup_data = user_setup_data;
if (info->filename)
{
envp = g_environ_setenv (envp,
"GIO_LAUNCHED_DESKTOP_FILE",
info->filename,
TRUE);
envp = g_environ_setenv (envp,
"GIO_LAUNCHED_DESKTOP_FILE_PID",
"XXXXXXXXXXXXXXXXXXXX", /* filled in child_setup */
TRUE);
data.pid_envvar = (char *)g_environ_getenv (envp, "GIO_LAUNCHED_DESKTOP_FILE_PID");
}
else
{
data.pid_envvar = NULL;
}
envp = g_environ_setenv (envp,
"GIO_LAUNCHED_DESKTOP_FILE",
info->filename,
TRUE);
sn_id = NULL;
if (launch_context)
@@ -2760,14 +2716,40 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo *info,
g_list_free_full (launched_files, g_object_unref);
}
if (!g_spawn_async (info->path,
argv,
envp,
spawn_flags,
child_setup,
&data,
&pid,
error))
if (g_once_init_enter (&gio_launch_desktop_path))
{
const gchar *tmp;
/* Allow test suite to specify path to gio-launch-desktop */
tmp = g_getenv ("GIO_LAUNCH_DESKTOP");
/* Fall back on usual searching in $PATH */
if (tmp == NULL)
tmp = "gio-launch-desktop";
g_once_init_leave (&gio_launch_desktop_path, tmp);
}
wrapped_argv = g_new (char *, argc + 2);
wrapped_argv[0] = g_strdup (gio_launch_desktop_path);
for (i = 0; i < argc; i++)
wrapped_argv[i + 1] = g_steal_pointer (&argv[i]);
wrapped_argv[i + 1] = NULL;
g_free (argv);
argv = NULL;
if (!g_spawn_async_with_fds (info->path,
wrapped_argv,
envp,
spawn_flags,
user_setup,
user_setup_data,
&pid,
stdin_fd,
stdout_fd,
stderr_fd,
error))
{
if (sn_id)
g_app_launch_context_launch_failed (launch_context, sn_id);
@@ -2805,8 +2787,8 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo *info,
g_free (sn_id);
g_list_free (launched_uris);
g_strfreev (argv);
argv = NULL;
g_strfreev (wrapped_argv);
wrapped_argv = NULL;
}
while (dup_uris != NULL);
@@ -2940,6 +2922,9 @@ g_desktop_app_info_launch_uris_internal (GAppInfo *appinfo,
gpointer user_setup_data,
GDesktopAppLaunchCallback pid_callback,
gpointer pid_callback_data,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error)
{
GDesktopAppInfo *info = G_DESKTOP_APP_INFO (appinfo);
@@ -2953,7 +2938,8 @@ g_desktop_app_info_launch_uris_internal (GAppInfo *appinfo,
else
success = g_desktop_app_info_launch_uris_with_spawn (info, session_bus, info->exec, uris, launch_context,
spawn_flags, user_setup, user_setup_data,
pid_callback, pid_callback_data, error);
pid_callback, pid_callback_data,
stdin_fd, stdout_fd, stderr_fd, error);
if (session_bus != NULL)
{
@@ -2978,6 +2964,7 @@ g_desktop_app_info_launch_uris (GAppInfo *appinfo,
launch_context,
_SPAWN_FLAGS_DEFAULT,
NULL, NULL, NULL, NULL,
-1, -1, -1,
error);
}
@@ -3028,6 +3015,61 @@ g_desktop_app_info_launch (GAppInfo *appinfo,
return res;
}
/**
* g_desktop_app_info_launch_uris_as_manager_with_fds:
* @appinfo: a #GDesktopAppInfo
* @uris: (element-type utf8): List of URIs
* @launch_context: (nullable): a #GAppLaunchContext
* @spawn_flags: #GSpawnFlags, used for each process
* @user_setup: (scope async) (nullable): a #GSpawnChildSetupFunc, used once
* for each process.
* @user_setup_data: (closure user_setup) (nullable): User data for @user_setup
* @pid_callback: (scope call) (nullable): Callback for child processes
* @pid_callback_data: (closure pid_callback) (nullable): User data for @callback
* @stdin_fd: file descriptor to use for child's stdin, or -1
* @stdout_fd: file descriptor to use for child's stdout, or -1
* @stderr_fd: file descriptor to use for child's stderr, or -1
* @error: return location for a #GError, or %NULL
*
* Equivalent to g_desktop_app_info_launch_uris_as_manager() but allows
* you to pass in file descriptors for the stdin, stdout and stderr streams
* of the launched process.
*
* If application launching occurs via some non-spawn mechanism (e.g. D-Bus
* activation) then @stdin_fd, @stdout_fd and @stderr_fd are ignored.
*
* Returns: %TRUE on successful launch, %FALSE otherwise.
*
* Since: 2.58
*/
gboolean
g_desktop_app_info_launch_uris_as_manager_with_fds (GDesktopAppInfo *appinfo,
GList *uris,
GAppLaunchContext *launch_context,
GSpawnFlags spawn_flags,
GSpawnChildSetupFunc user_setup,
gpointer user_setup_data,
GDesktopAppLaunchCallback pid_callback,
gpointer pid_callback_data,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error)
{
return g_desktop_app_info_launch_uris_internal ((GAppInfo*)appinfo,
uris,
launch_context,
spawn_flags,
user_setup,
user_setup_data,
pid_callback,
pid_callback_data,
stdin_fd,
stdout_fd,
stderr_fd,
error);
}
/**
* g_desktop_app_info_launch_uris_as_manager:
* @appinfo: a #GDesktopAppInfo
@@ -3046,11 +3088,12 @@ g_desktop_app_info_launch (GAppInfo *appinfo,
* launch applications. Ordinary applications should use
* g_app_info_launch_uris().
*
* If the application is launched via traditional UNIX fork()/exec()
* then @spawn_flags, @user_setup and @user_setup_data are used for the
* call to g_spawn_async(). Additionally, @pid_callback (with
* @pid_callback_data) will be called to inform about the PID of the
* created process.
* If the application is launched via GSpawn, then @spawn_flags, @user_setup
* and @user_setup_data are used for the call to g_spawn_async().
* Additionally, @pid_callback (with @pid_callback_data) will be called to
* inform about the PID of the created process. See g_spawn_async_with_pipes()
* for information on certain parameter conditions that can enable an
* optimized posix_spawn() codepath to be used.
*
* If application launching occurs via some other mechanism (eg: D-Bus
* activation) then @spawn_flags, @user_setup, @user_setup_data,
@@ -3069,15 +3112,16 @@ g_desktop_app_info_launch_uris_as_manager (GDesktopAppInfo *appinfo,
gpointer pid_callback_data,
GError **error)
{
return g_desktop_app_info_launch_uris_internal ((GAppInfo*)appinfo,
uris,
launch_context,
spawn_flags,
user_setup,
user_setup_data,
pid_callback,
pid_callback_data,
error);
return g_desktop_app_info_launch_uris_as_manager_with_fds (appinfo,
uris,
launch_context,
spawn_flags,
user_setup,
user_setup_data,
pid_callback,
pid_callback_data,
-1, -1, -1,
error);
}
/* OnlyShowIn API support {{{2 */
@@ -4652,7 +4696,8 @@ g_desktop_app_info_launch_action (GDesktopAppInfo *info,
if (exec_line)
g_desktop_app_info_launch_uris_with_spawn (info, session_bus, exec_line, NULL, launch_context,
_SPAWN_FLAGS_DEFAULT, NULL, NULL, NULL, NULL, NULL);
_SPAWN_FLAGS_DEFAULT, NULL, NULL, NULL, NULL,
-1, -1, -1, NULL);
}
if (session_bus != NULL)

14
gio/gdesktopappinfo.h
View File

@@ -169,6 +169,20 @@ gboolean g_desktop_app_info_launch_uris_as_manager (GDesktopAppInfo
gpointer pid_callback_data,
GError **error);
GLIB_AVAILABLE_IN_2_58
gboolean g_desktop_app_info_launch_uris_as_manager_with_fds (GDesktopAppInfo *appinfo,
GList *uris,
GAppLaunchContext *launch_context,
GSpawnFlags spawn_flags,
GSpawnChildSetupFunc user_setup,
gpointer user_setup_data,
GDesktopAppLaunchCallback pid_callback,
gpointer pid_callback_data,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error);
GLIB_AVAILABLE_IN_2_40
gchar *** g_desktop_app_info_search (const gchar *search_string);

52
gio/gio-launch-desktop.c Normal file
View File

@@ -0,0 +1,52 @@
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2018 Endless Mobile, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Daniel Drake <drake@endlessm.com>
*/
/*
* gio-launch-desktop: GDesktopAppInfo helper
* Executable wrapper to set GIO_LAUNCHED_DESKTOP_FILE_PID
* There are complications when doing this in a fork()/exec() codepath,
* and it cannot otherwise be done with posix_spawn().
* This wrapper is designed to be minimal and lightweight.
* It does not even link against glib.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int
main (int argc, char *argv[])
{
pid_t pid = getpid ();
char buf[50];
int r;
if (argc < 2)
return -1;
r = snprintf (buf, sizeof (buf), "GIO_LAUNCHED_DESKTOP_FILE_PID=%ld", (long) pid);
if (r >= sizeof (buf))
return -1;
putenv (buf);
return execvp (argv[1], argv + 1);
}

6
gio/meson.build
View File

@@ -411,6 +411,12 @@ if host_system != 'windows'
contenttype_sources += files('gcontenttype.c')
appinfo_sources += files('gdesktopappinfo.c')
gio_unix_include_headers += files('gdesktopappinfo.h')
executable('gio-launch-desktop', 'gio-launch-desktop.c',
install : true,
c_args : gio_c_args,
# intl.lib is not compatible with SAFESEH
link_args : noseh_link_args)
endif
subdir('xdgmime')

4
gio/tests/Makefile.am
View File

@@ -15,7 +15,9 @@ LDADD = \
AM_CPPFLAGS = $(gio_INCLUDES) $(GLIB_DEBUG_FLAGS) -I$(top_builddir)/gio -I$(top_srcdir)/gio
DEFS = -DG_LOG_DOMAIN=\"GLib-GIO\" -DTEST_SERVICES=\""$(abs_top_builddir)/gio/tests/services"\"
AM_CFLAGS = $(GLIB_WARN_CFLAGS)
AM_TESTS_ENVIRONMENT += GIO_MODULE_DIR=
AM_TESTS_ENVIRONMENT += \
GIO_MODULE_DIR= \
GIO_LAUNCH_DESKTOP="$(top_builddir)/gio/gio-launch-desktop"
# -----------------------------------------------------------------------------
# Test programs buildable on all platforms

41
gio/tests/desktop-app-info.c
View File

@@ -788,6 +788,46 @@ test_show_in (void)
assert_shown ("gcr-prompter.desktop", TRUE, "KDE:GNOME-Classic");
}
/* Test g_desktop_app_info_launch_uris_as_manager() and
* g_desktop_app_info_launch_uris_as_manager_with_fds()
*/
static void
test_launch_as_manager (void)
{
GDesktopAppInfo *appinfo;
GError *error = NULL;
gboolean retval;
const gchar *path;
if (g_getenv ("DISPLAY") == NULL || g_getenv ("DISPLAY")[0] == '\0')
{
g_test_skip ("No DISPLAY. Skipping test.");
return;
}
path = g_test_get_filename (G_TEST_DIST, "appinfo-test.desktop", NULL);
appinfo = g_desktop_app_info_new_from_filename (path);
g_assert_nonnull (appinfo);
retval = g_desktop_app_info_launch_uris_as_manager (appinfo, NULL, NULL, 0,
NULL, NULL,
NULL, NULL,
&error);
g_assert_no_error (error);
g_assert_true (retval);
retval = g_desktop_app_info_launch_uris_as_manager_with_fds (appinfo,
NULL, NULL, 0,
NULL, NULL,
NULL, NULL,
-1, -1, -1,
&error);
g_assert_no_error (error);
g_assert_true (retval);
g_object_unref (appinfo);
}
int
main (int argc,
char *argv[])
@@ -816,6 +856,7 @@ main (int argc,
g_test_add_func ("/desktop-app-info/search", test_search);
g_test_add_func ("/desktop-app-info/implements", test_implements);
g_test_add_func ("/desktop-app-info/show-in", test_show_in);
g_test_add_func ("/desktop-app-info/launch-as-manager", test_launch_as_manager);
result = g_test_run ();

1
gio/tests/meson.build
View File

@@ -75,6 +75,7 @@ test_env = [
'G_TEST_SRCDIR=' + meson.current_source_dir(),
'G_TEST_BUILDDIR=' + meson.current_build_dir(),
'GIO_MODULE_DIR=',
'GIO_LAUNCH_DESKTOP=' + meson.build_root() + '/gio/gio-launch-desktop',
]
test_c_args = [

163
glib/gspawn-win32.c
View File

@@ -520,19 +520,19 @@ do_spawn_directly (gint *exit_status,
}
static gboolean
do_spawn_with_pipes (gint *exit_status,
gboolean do_return_handle,
const gchar *working_directory,
gchar **argv,
char **envp,
GSpawnFlags flags,
GSpawnChildSetupFunc child_setup,
GPid *child_handle,
gint *standard_input,
gint *standard_output,
gint *standard_error,
gint *err_report,
GError **error)
do_spawn_with_fds (gint *exit_status,
gboolean do_return_handle,
const gchar *working_directory,
gchar **argv,
char **envp,
GSpawnFlags flags,
GSpawnChildSetupFunc child_setup,
GPid *child_handle,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
gint *err_report,
GError **error)
{
char **protected_argv;
char args[ARG_COUNT][10];
@@ -541,9 +541,6 @@ do_spawn_with_pipes (gint *exit_status,
gintptr rc = -1;
int errsv;
int argc;
int stdin_pipe[2] = { -1, -1 };
int stdout_pipe[2] = { -1, -1 };
int stderr_pipe[2] = { -1, -1 };
int child_err_report_pipe[2] = { -1, -1 };
int helper_sync_pipe[2] = { -1, -1 };
gintptr helper_report[2];
@@ -562,7 +559,7 @@ do_spawn_with_pipes (gint *exit_status,
argc = protect_argv (argv, &protected_argv);
if (!standard_input && !standard_output && !standard_error &&
if (stdin_fd == -1 && stdout_fd == -1 && stderr_fd == -1 &&
(flags & G_SPAWN_CHILD_INHERITS_STDIN) &&
!(flags & G_SPAWN_STDOUT_TO_DEV_NULL) &&
!(flags & G_SPAWN_STDERR_TO_DEV_NULL) &&
@@ -578,15 +575,6 @@ do_spawn_with_pipes (gint *exit_status,
return retval;
}
if (standard_input && !make_pipe (stdin_pipe, error))
goto cleanup_and_fail;
if (standard_output && !make_pipe (stdout_pipe, error))
goto cleanup_and_fail;
if (standard_error && !make_pipe (stderr_pipe, error))
goto cleanup_and_fail;
if (!make_pipe (child_err_report_pipe, error))
goto cleanup_and_fail;
@@ -639,9 +627,9 @@ do_spawn_with_pipes (gint *exit_status,
*/
helper_sync_pipe[1] = dup_noninherited (helper_sync_pipe[1], _O_WRONLY);
if (standard_input)
if (stdin_fd != -1)
{
_g_sprintf (args[ARG_STDIN], "%d", stdin_pipe[0]);
_g_sprintf (args[ARG_STDIN], "%d", stdin_fd);
new_argv[ARG_STDIN] = args[ARG_STDIN];
}
else if (flags & G_SPAWN_CHILD_INHERITS_STDIN)
@@ -655,9 +643,9 @@ do_spawn_with_pipes (gint *exit_status,
new_argv[ARG_STDIN] = "z";
}
if (standard_output)
if (stdout_fd != -1)
{
_g_sprintf (args[ARG_STDOUT], "%d", stdout_pipe[1]);
_g_sprintf (args[ARG_STDOUT], "%d", stdout_fd);
new_argv[ARG_STDOUT] = args[ARG_STDOUT];
}
else if (flags & G_SPAWN_STDOUT_TO_DEV_NULL)
@@ -669,9 +657,9 @@ do_spawn_with_pipes (gint *exit_status,
new_argv[ARG_STDOUT] = "-";
}
if (standard_error)
if (stdout_fd != -1)
{
_g_sprintf (args[ARG_STDERR], "%d", stderr_pipe[1]);
_g_sprintf (args[ARG_STDERR], "%d", stderr_fd);
new_argv[ARG_STDERR] = args[ARG_STDERR];
}
else if (flags & G_SPAWN_STDERR_TO_DEV_NULL)
@@ -770,9 +758,6 @@ do_spawn_with_pipes (gint *exit_status,
*/
close_and_invalidate (&child_err_report_pipe[1]);
close_and_invalidate (&helper_sync_pipe[0]);
close_and_invalidate (&stdin_pipe[0]);
close_and_invalidate (&stdout_pipe[1]);
close_and_invalidate (&stderr_pipe[1]);
g_strfreev (protected_argv);
@@ -842,12 +827,6 @@ do_spawn_with_pipes (gint *exit_status,
/* Success against all odds! return the information */
if (standard_input)
*standard_input = stdin_pipe[1];
if (standard_output)
*standard_output = stdout_pipe[0];
if (standard_error)
*standard_error = stderr_pipe[0];
if (rc != -1)
CloseHandle ((HANDLE) rc);
@@ -865,6 +844,71 @@ do_spawn_with_pipes (gint *exit_status,
close (helper_sync_pipe[0]);
if (helper_sync_pipe[1] != -1)
close (helper_sync_pipe[1]);
return FALSE;
}
static gboolean
do_spawn_with_pipes (gint *exit_status,
gboolean do_return_handle,
const gchar *working_directory,
gchar **argv,
char **envp,
GSpawnFlags flags,
GSpawnChildSetupFunc child_setup,
GPid *child_handle,
gint *standard_input,
gint *standard_output,
gint *standard_error,
gint *err_report,
GError **error)
{
int stdin_pipe[2] = { -1, -1 };
int stdout_pipe[2] = { -1, -1 };
int stderr_pipe[2] = { -1, -1 };
if (standard_input && !make_pipe (stdin_pipe, error))
goto cleanup_and_fail;
if (standard_output && !make_pipe (stdout_pipe, error))
goto cleanup_and_fail;
if (standard_error && !make_pipe (stderr_pipe, error))
goto cleanup_and_fail;
if (!do_spawn_with_fds (exit_status,
do_return_handle,
working_directory,
argv,
envp,
flags,
child_setup,
child_handle,
stdin_pipe[0],
stdout_pipe[1],
stderr_pipe[1],
err_report,
error))
goto cleanup_and_fail;
/* Close the other process's ends of the pipes in this process,
* otherwise the reader will never get EOF.
*/
close_and_invalidate (&stdin_pipe[0]);
close_and_invalidate (&stdout_pipe[1]);
close_and_invalidate (&stderr_pipe[1]);
if (standard_input)
*standard_input = stdin_pipe[1];
if (standard_output)
*standard_output = stdout_pipe[0];
if (standard_error)
*standard_error = stderr_pipe[0];
return TRUE;
cleanup_and_fail:
if (stdin_pipe[0] != -1)
close (stdin_pipe[0]);
if (stdin_pipe[1] != -1)
@@ -1160,6 +1204,43 @@ g_spawn_async_with_pipes (const gchar *working_directory,
error);
}
gboolean
g_spawn_async_with_fds (const gchar *working_directory,
gchar **argv,
gchar **envp,
GSpawnFlags flags,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_handle,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error)
{
g_return_val_if_fail (argv != NULL, FALSE);
g_return_val_if_fail (stdin_fd == -1 ||
!(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE);
g_return_val_if_fail (stderr_fd == -1 ||
!(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE);
/* can't inherit stdin if we have an input pipe. */
g_return_val_if_fail (stdin_fd == -1 ||
!(flags & G_SPAWN_CHILD_INHERITS_STDIN), FALSE);
return do_spawn_with_fds (NULL,
(flags & G_SPAWN_DO_NOT_REAP_CHILD),
working_directory,
argv,
envp,
flags,
child_setup,
child_handle,
stdin_fd,
stdout_fd,
stderr_fd,
NULL,
error);
}
gboolean
g_spawn_command_line_sync (const gchar *command_line,
gchar **standard_output,

540
glib/gspawn.c
View File

@@ -30,6 +30,7 @@
#include <string.h>
#include <stdlib.h> /* for fdwalk */
#include <dirent.h>
#include <spawn.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
@@ -54,6 +55,22 @@
#include "glibintl.h"
#include "glib-unix.h"
/* posix_spawn() is assumed the fastest way to spawn, but glibc's
* implementation was buggy before glibc 2.24, so avoid it on old versions.
*/
#ifdef HAVE_POSIX_SPAWN
#ifdef __GLIBC__
#if __GLIBC_PREREQ(2,24)
#define POSIX_SPAWN_AVAILABLE
#endif
#else /* !__GLIBC__ */
/* Assume that all non-glibc posix_spawn implementations are fine. */
#define POSIX_SPAWN_AVAILABLE
#endif /* __GLIBC__ */
#endif /* HAVE_POSIX_SPAWN */
/**
* SECTION:spawn
* @Short_description: process launching
@@ -142,6 +159,27 @@ static gboolean fork_exec_with_pipes (gboolean intermediate_child,
gint *standard_error,
GError **error);
static gboolean fork_exec_with_fds (gboolean intermediate_child,
const gchar *working_directory,
gchar **argv,
gchar **envp,
gboolean close_descriptors,
gboolean search_path,
gboolean search_path_from_envp,
gboolean stdout_to_null,
gboolean stderr_to_null,
gboolean child_inherits_stdin,
gboolean file_and_argv_zero,
gboolean cloexec_pipes,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_pid,
gint *child_close_fds,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error);
G_DEFINE_QUARK (g-exec-error-quark, g_spawn_error)
G_DEFINE_QUARK (g-spawn-exit-error-quark, g_spawn_exit_error)
@@ -600,10 +638,11 @@ g_spawn_sync (const gchar *working_directory,
* is equivalent to calling CloseHandle() on the process handle returned
* in @child_pid). See g_child_watch_add().
*
* %G_SPAWN_LEAVE_DESCRIPTORS_OPEN means that the parent's open file
* descriptors will be inherited by the child; otherwise all descriptors
* except stdin/stdout/stderr will be closed before calling exec() in
* the child. %G_SPAWN_SEARCH_PATH means that @argv[0] need not be an
* Open UNIX file descriptors marked as `FD_CLOEXEC` will be automatically
* closed in the child process. %G_SPAWN_LEAVE_DESCRIPTORS_OPEN means that
* other open file descriptors will be inherited by the child; otherwise all
* descriptors except stdin/stdout/stderr will be closed before calling exec()
* in the child. %G_SPAWN_SEARCH_PATH means that @argv[0] need not be an
* absolute path, it will be looked for in the `PATH` environment
* variable. %G_SPAWN_SEARCH_PATH_FROM_ENVP means need not be an
* absolute path, it will be looked for in the `PATH` variable from
@@ -678,6 +717,21 @@ g_spawn_sync (const gchar *working_directory,
* If @child_pid is not %NULL and an error does not occur then the returned
* process reference must be closed using g_spawn_close_pid().
*
* On modern UNIX platforms, GLib can use an efficient process launching
* codepath driven internally by posix_spawn(). This has the advantage of
* avoiding the fork-time performance costs of cloning the parent process
* address space, and avoiding associated memory overcommit checks that are
* not relevant in the context of immediately executing a distinct process.
* This optimized codepath will be used provided that the following conditions
* are met:
*
* 1. %G_SPAWN_DO_NOT_REAP_CHILD is set
* 2. %G_SPAWN_LEAVE_DESCRIPTORS_OPEN is set
* 3. %G_SPAWN_SEARCH_PATH_FROM_ENVP is not set
* 4. @working_directory is %NULL
* 5. @child_setup is %NULL
* 6. The program is of a recognised binary format, or has a shebang. Otherwise, GLib will have to execute the program through the shell, which is not done using the optimized codepath.
*
* If you are writing a GTK+ application, and the program you are spawning is a
* graphical application too, then to ensure that the spawned program opens its
* windows on the right screen, you may want to use #GdkAppLaunchContext,
@@ -728,6 +782,87 @@ g_spawn_async_with_pipes (const gchar *working_directory,
error);
}
/**
* g_spawn_async_with_fds:
* @working_directory: (type filename) (nullable): child's current working directory, or %NULL to inherit parent's, in the GLib file name encoding
* @argv: (array zero-terminated=1): child's argument vector, in the GLib file name encoding
* @envp: (array zero-terminated=1) (nullable): child's environment, or %NULL to inherit parent's, in the GLib file name encoding
* @flags: flags from #GSpawnFlags
* @child_setup: (scope async) (nullable): function to run in the child just before exec()
* @user_data: (closure): user data for @child_setup
* @child_pid: (out) (optional): return location for child process ID, or %NULL
* @stdin_fd: file descriptor to use for child's stdin, or -1
* @stdout_fd: file descriptor to use for child's stdout, or -1
* @stderr_fd: file descriptor to use for child's stderr, or -1
* @error: return location for error
*
* Identical to g_spawn_async_with_pipes() but instead of
* creating pipes for the stdin/stdout/stderr, you can pass existing
* file descriptors into this function through the @stdin_fd,
* @stdout_fd and @stderr_fd parameters. The following @flags
* also have their behaviour slightly tweaked as a result:
*
* %G_SPAWN_STDOUT_TO_DEV_NULL means that the child's standard output
* will be discarded, instead of going to the same location as the parent's
* standard output. If you use this flag, @standard_output must be -1.
* %G_SPAWN_STDERR_TO_DEV_NULL means that the child's standard error
* will be discarded, instead of going to the same location as the parent's
* standard error. If you use this flag, @standard_error must be -1.
* %G_SPAWN_CHILD_INHERITS_STDIN means that the child will inherit the parent's
* standard input (by default, the child's standard input is attached to
* /dev/null). If you use this flag, @standard_input must be -1.
*
* It is valid to pass the same fd in multiple parameters (e.g. you can pass
* a single fd for both stdout and stderr).
*
* Returns: %TRUE on success, %FALSE if an error was set
*
* Since: 2.58
*/
gboolean
g_spawn_async_with_fds (const gchar *working_directory,
gchar **argv,
gchar **envp,
GSpawnFlags flags,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_pid,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error)
{
g_return_val_if_fail (argv != NULL, FALSE);
g_return_val_if_fail (stdout_fd == -1 ||
!(flags & G_SPAWN_STDOUT_TO_DEV_NULL), FALSE);
g_return_val_if_fail (stderr_fd == -1 ||
!(flags & G_SPAWN_STDERR_TO_DEV_NULL), FALSE);
/* can't inherit stdin if we have an input pipe. */
g_return_val_if_fail (stdin_fd == -1 ||
!(flags & G_SPAWN_CHILD_INHERITS_STDIN), FALSE);
return fork_exec_with_fds (!(flags & G_SPAWN_DO_NOT_REAP_CHILD),
working_directory,
argv,
envp,
!(flags & G_SPAWN_LEAVE_DESCRIPTORS_OPEN),
(flags & G_SPAWN_SEARCH_PATH) != 0,
(flags & G_SPAWN_SEARCH_PATH_FROM_ENVP) != 0,
(flags & G_SPAWN_STDOUT_TO_DEV_NULL) != 0,
(flags & G_SPAWN_STDERR_TO_DEV_NULL) != 0,
(flags & G_SPAWN_CHILD_INHERITS_STDIN) != 0,
(flags & G_SPAWN_FILE_AND_ARGV_ZERO) != 0,
(flags & G_SPAWN_CLOEXEC_PIPES) != 0,
child_setup,
user_data,
child_pid,
NULL,
stdin_fd,
stdout_fd,
stderr_fd,
error);
}
/**
* g_spawn_command_line_sync:
* @command_line: (type filename): a command line
@@ -1118,13 +1253,12 @@ do_exec (gint child_err_report_fd,
write_err_and_exit (child_err_report_fd,
CHILD_DUP2_FAILED);
/* ignore this if it doesn't work */
close_and_invalidate (&stdin_fd);
set_cloexec (GINT_TO_POINTER(0), stdin_fd);
}
else if (!child_inherits_stdin)
{
/* Keep process from blocking on a read of stdin */
gint read_null = open ("/dev/null", O_RDONLY);
gint read_null = sane_open ("/dev/null", O_RDONLY);
g_assert (read_null != -1);
sane_dup2 (read_null, 0);
close_and_invalidate (&read_null);
@@ -1138,8 +1272,7 @@ do_exec (gint child_err_report_fd,
write_err_and_exit (child_err_report_fd,
CHILD_DUP2_FAILED);
/* ignore this if it doesn't work */
close_and_invalidate (&stdout_fd);
set_cloexec (GINT_TO_POINTER(0), stdout_fd);
}
else if (stdout_to_null)
{
@@ -1157,8 +1290,7 @@ do_exec (gint child_err_report_fd,
write_err_and_exit (child_err_report_fd,
CHILD_DUP2_FAILED);
/* ignore this if it doesn't work */
close_and_invalidate (&stderr_fd);
set_cloexec (GINT_TO_POINTER(0), stderr_fd);
}
else if (stderr_to_null)
{
@@ -1231,51 +1363,256 @@ read_ints (int fd,
return TRUE;
}
#ifdef POSIX_SPAWN_AVAILABLE
static gboolean
fork_exec_with_pipes (gboolean intermediate_child,
const gchar *working_directory,
gchar **argv,
gchar **envp,
gboolean close_descriptors,
gboolean search_path,
gboolean search_path_from_envp,
gboolean stdout_to_null,
gboolean stderr_to_null,
gboolean child_inherits_stdin,
gboolean file_and_argv_zero,
gboolean cloexec_pipes,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_pid,
gint *standard_input,
gint *standard_output,
gint *standard_error,
GError **error)
do_posix_spawn (gchar **argv,
gchar **envp,
gboolean search_path,
gboolean stdout_to_null,
gboolean stderr_to_null,
gboolean child_inherits_stdin,
gboolean file_and_argv_zero,
GPid *child_pid,
gint *child_close_fds,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd)
{
pid_t pid;
gchar **argv_pass;
posix_spawnattr_t attr;
posix_spawn_file_actions_t file_actions;
gint parent_close_fds[3];
gint num_parent_close_fds = 0;
GSList *child_close = NULL;
GSList *elem;
sigset_t mask;
int i, r;
if (*argv[0] == '\0')
{
/* We check the simple case first. */
return ENOENT;
}
r = posix_spawnattr_init (&attr);
if (r != 0)
return r;
if (child_close_fds)
{
int i = -1;
while (child_close_fds[++i] != -1)
child_close = g_slist_prepend (child_close,
GINT_TO_POINTER (child_close_fds[i]));
}
r = posix_spawnattr_setflags (&attr, POSIX_SPAWN_SETSIGDEF);
if (r != 0)
goto out_free_spawnattr;
/* Reset some signal handlers that we may use */
sigemptyset (&mask);
sigaddset (&mask, SIGCHLD);
sigaddset (&mask, SIGINT);
sigaddset (&mask, SIGTERM);
sigaddset (&mask, SIGHUP);
r = posix_spawnattr_setsigdefault (&attr, &mask);
if (r != 0)
goto out_free_spawnattr;
r = posix_spawn_file_actions_init (&file_actions);
if (r != 0)
goto out_free_spawnattr;
/* Redirect pipes as required */
if (stdin_fd >= 0)
{
r = posix_spawn_file_actions_adddup2 (&file_actions, stdin_fd, 0);
if (r != 0)
goto out_close_fds;
if (!g_slist_find (child_close, GINT_TO_POINTER (stdin_fd)))
child_close = g_slist_prepend (child_close, GINT_TO_POINTER (stdin_fd));
}
else if (!child_inherits_stdin)
{
/* Keep process from blocking on a read of stdin */
gint read_null = sane_open ("/dev/null", O_RDONLY | O_CLOEXEC);
g_assert (read_null != -1);
parent_close_fds[num_parent_close_fds++] = read_null;
r = posix_spawn_file_actions_adddup2 (&file_actions, read_null, 0);
if (r != 0)
goto out_close_fds;
}
if (stdout_fd >= 0)
{
r = posix_spawn_file_actions_adddup2 (&file_actions, stdout_fd, 1);
if (r != 0)
goto out_close_fds;
if (!g_slist_find (child_close, GINT_TO_POINTER (stdout_fd)))
child_close = g_slist_prepend (child_close, GINT_TO_POINTER (stdout_fd));
}
else if (stdout_to_null)
{
gint write_null = sane_open ("/dev/null", O_WRONLY | O_CLOEXEC);
g_assert (write_null != -1);
parent_close_fds[num_parent_close_fds++] = write_null;
r = posix_spawn_file_actions_adddup2 (&file_actions, write_null, 1);
if (r != 0)
goto out_close_fds;
}
if (stderr_fd >= 0)
{
r = posix_spawn_file_actions_adddup2 (&file_actions, stderr_fd, 2);
if (r != 0)
goto out_close_fds;
if (!g_slist_find (child_close, GINT_TO_POINTER (stderr_fd)))
child_close = g_slist_prepend (child_close, GINT_TO_POINTER (stderr_fd));
}
else if (stderr_to_null)
{
gint write_null = sane_open ("/dev/null", O_WRONLY | O_CLOEXEC);
g_assert (write_null != -1);
parent_close_fds[num_parent_close_fds++] = write_null;
r = posix_spawn_file_actions_adddup2 (&file_actions, write_null, 2);
if (r != 0)
goto out_close_fds;
}
/* Intentionally close the fds in the child as the last file action,
* having been careful not to add the same fd to this list twice.
*
* This is important to allow (e.g.) for the same fd to be passed as stdout
* and stderr (we must not close it before we have dupped it in both places,
* and we must not attempt to close it twice).
*/
for (elem = child_close; elem != NULL; elem = elem->next)
{
r = posix_spawn_file_actions_addclose (&file_actions,
GPOINTER_TO_INT (elem->data));
if (r != 0)
goto out_close_fds;
}
argv_pass = file_and_argv_zero ? argv + 1 : argv;
if (envp == NULL)
envp = environ;
/* Don't search when it contains a slash. */
if (!search_path || strchr (argv[0], '/') != NULL)
r = posix_spawn (&pid, argv[0], &file_actions, &attr, argv_pass, envp);
else
r = posix_spawnp (&pid, argv[0], &file_actions, &attr, argv_pass, envp);
if (r == 0 && child_pid != NULL)
*child_pid = pid;
out_close_fds:
for (i = 0; i < num_parent_close_fds; i++)
close_and_invalidate (&parent_close_fds [i]);
posix_spawn_file_actions_destroy (&file_actions);
out_free_spawnattr:
posix_spawnattr_destroy (&attr);
g_slist_free (child_close);
return r;
}
#endif /* POSIX_SPAWN_AVAILABLE */
static gboolean
fork_exec_with_fds (gboolean intermediate_child,
const gchar *working_directory,
gchar **argv,
gchar **envp,
gboolean close_descriptors,
gboolean search_path,
gboolean search_path_from_envp,
gboolean stdout_to_null,
gboolean stderr_to_null,
gboolean child_inherits_stdin,
gboolean file_and_argv_zero,
gboolean cloexec_pipes,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_pid,
gint *child_close_fds,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error)
{
GPid pid = -1;
gint stdin_pipe[2] = { -1, -1 };
gint stdout_pipe[2] = { -1, -1 };
gint stderr_pipe[2] = { -1, -1 };
gint child_err_report_pipe[2] = { -1, -1 };
gint child_pid_report_pipe[2] = { -1, -1 };
guint pipe_flags = cloexec_pipes ? FD_CLOEXEC : 0;
gint status;
#ifdef POSIX_SPAWN_AVAILABLE
if (!intermediate_child && working_directory == NULL && !close_descriptors &&
!search_path_from_envp && child_setup == NULL)
{
g_debug ("Launching with posix_spawn");
status = do_posix_spawn (argv,
envp,
search_path,
stdout_to_null,
stderr_to_null,
child_inherits_stdin,
file_and_argv_zero,
child_pid,
child_close_fds,
stdin_fd,
stdout_fd,
stderr_fd);
if (status == 0)
return TRUE;
if (status != ENOEXEC)
{
g_set_error (error,
G_SPAWN_ERROR,
G_SPAWN_ERROR_FAILED,
_("Failed to spawn child process \"%s\" (%s)"),
argv[0],
g_strerror (status));
return FALSE;
}
/* posix_spawn is not intended to support script execution. It does in
* some situations on some glibc versions, but that will be fixed.
* So if it fails with ENOEXEC, we fall through to the regular
* gspawn codepath so that script execution can be attempted,
* per standard gspawn behaviour. */
g_debug ("posix_spawn failed (ENOEXEC), fall back to regular gspawn");
}
else
{
g_debug ("posix_spawn avoided %s%s%s%s%s",
!intermediate_child ? "" : "(automatic reaping requested) ",
working_directory == NULL ? "" : "(workdir specified) ",
!close_descriptors ? "" : "(fd close requested) ",
!search_path_from_envp ? "" : "(using envp for search path) ",
child_setup == NULL ? "" : "(child_setup specified) ");
}
#endif /* POSIX_SPAWN_AVAILABLE */
if (!g_unix_open_pipe (child_err_report_pipe, pipe_flags, error))
return FALSE;
if (intermediate_child && !g_unix_open_pipe (child_pid_report_pipe, pipe_flags, error))
goto cleanup_and_fail;
if (standard_input && !g_unix_open_pipe (stdin_pipe, pipe_flags, error))
goto cleanup_and_fail;
if (standard_output && !g_unix_open_pipe (stdout_pipe, pipe_flags, error))
goto cleanup_and_fail;
if (standard_error && !g_unix_open_pipe (stderr_pipe, FD_CLOEXEC, error))
goto cleanup_and_fail;
pid = fork ();
if (pid < 0)
@@ -1313,9 +1650,12 @@ fork_exec_with_pipes (gboolean intermediate_child,
*/
close_and_invalidate (&child_err_report_pipe[0]);
close_and_invalidate (&child_pid_report_pipe[0]);
close_and_invalidate (&stdin_pipe[1]);
close_and_invalidate (&stdout_pipe[0]);
close_and_invalidate (&stderr_pipe[0]);
if (child_close_fds != NULL)
{
int i = -1;
while (child_close_fds[++i] != -1)
close_and_invalidate (&child_close_fds[i]);
}
if (intermediate_child)
{
@@ -1341,9 +1681,9 @@ fork_exec_with_pipes (gboolean intermediate_child,
{
close_and_invalidate (&child_pid_report_pipe[1]);
do_exec (child_err_report_pipe[1],
stdin_pipe[0],
stdout_pipe[1],
stderr_pipe[1],
stdin_fd,
stdout_fd,
stderr_fd,
working_directory,
argv,
envp,
@@ -1371,9 +1711,9 @@ fork_exec_with_pipes (gboolean intermediate_child,
*/
do_exec (child_err_report_pipe[1],
stdin_pipe[0],
stdout_pipe[1],
stderr_pipe[1],
stdin_fd,
stdout_fd,
stderr_fd,
working_directory,
argv,
envp,
@@ -1398,9 +1738,6 @@ fork_exec_with_pipes (gboolean intermediate_child,
/* Close the uncared-about ends of the pipes */
close_and_invalidate (&child_err_report_pipe[1]);
close_and_invalidate (&child_pid_report_pipe[1]);
close_and_invalidate (&stdin_pipe[0]);
close_and_invalidate (&stdout_pipe[1]);
close_and_invalidate (&stderr_pipe[1]);
/* If we had an intermediate child, reap it */
if (intermediate_child)
@@ -1513,13 +1850,6 @@ fork_exec_with_pipes (gboolean intermediate_child,
if (child_pid)
*child_pid = pid;
if (standard_input)
*standard_input = stdin_pipe[1];
if (standard_output)
*standard_output = stdout_pipe[0];
if (standard_error)
*standard_error = stderr_pipe[0];
return TRUE;
}
@@ -1548,6 +1878,92 @@ fork_exec_with_pipes (gboolean intermediate_child,
close_and_invalidate (&child_err_report_pipe[1]);
close_and_invalidate (&child_pid_report_pipe[0]);
close_and_invalidate (&child_pid_report_pipe[1]);
return FALSE;
}
static gboolean
fork_exec_with_pipes (gboolean intermediate_child,
const gchar *working_directory,
gchar **argv,
gchar **envp,
gboolean close_descriptors,
gboolean search_path,
gboolean search_path_from_envp,
gboolean stdout_to_null,
gboolean stderr_to_null,
gboolean child_inherits_stdin,
gboolean file_and_argv_zero,
gboolean cloexec_pipes,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_pid,
gint *standard_input,
gint *standard_output,
gint *standard_error,
GError **error)
{
guint pipe_flags = cloexec_pipes ? FD_CLOEXEC : 0;
gint stdin_pipe[2] = { -1, -1 };
gint stdout_pipe[2] = { -1, -1 };
gint stderr_pipe[2] = { -1, -1 };
gint child_close_fds[4];
gboolean ret;
if (standard_input && !g_unix_open_pipe (stdin_pipe, pipe_flags, error))
goto cleanup_and_fail;
if (standard_output && !g_unix_open_pipe (stdout_pipe, pipe_flags, error))
goto cleanup_and_fail;
if (standard_error && !g_unix_open_pipe (stderr_pipe, FD_CLOEXEC, error))
goto cleanup_and_fail;
child_close_fds[0] = stdin_pipe[1];
child_close_fds[1] = stdout_pipe[0];
child_close_fds[2] = stderr_pipe[0];
child_close_fds[3] = -1;
ret = fork_exec_with_fds (intermediate_child,
working_directory,
argv,
envp,
close_descriptors,
search_path,
search_path_from_envp,
stdout_to_null,
stderr_to_null,
child_inherits_stdin,
file_and_argv_zero,
pipe_flags,
child_setup,
user_data,
child_pid,
child_close_fds,
stdin_pipe[0],
stdout_pipe[1],
stderr_pipe[1],
error);
if (!ret)
goto cleanup_and_fail;
/* Close the uncared-about ends of the pipes */
close_and_invalidate (&stdin_pipe[0]);
close_and_invalidate (&stdout_pipe[1]);
close_and_invalidate (&stderr_pipe[1]);
if (standard_input)
*standard_input = stdin_pipe[1];
if (standard_output)
*standard_output = stdout_pipe[0];
if (standard_error)
*standard_error = stderr_pipe[0];
return TRUE;
cleanup_and_fail:
close_and_invalidate (&stdin_pipe[0]);
close_and_invalidate (&stdin_pipe[1]);
close_and_invalidate (&stdout_pipe[0]);

13
glib/gspawn.h
View File

@@ -215,6 +215,19 @@ gboolean g_spawn_async_with_pipes (const gchar *working_directory,
gint *standard_error,
GError **error);
/* Lets you provide fds for stdin/stdout/stderr */
GLIB_AVAILABLE_IN_2_58
gboolean g_spawn_async_with_fds (const gchar *working_directory,
gchar **argv,
gchar **envp,
GSpawnFlags flags,
GSpawnChildSetupFunc child_setup,
gpointer user_data,
GPid *child_pid,
gint stdin_fd,
gint stdout_fd,
gint stderr_fd,
GError **error);
/* If standard_output or standard_error are non-NULL, the full
* standard output or error of the command will be placed there.

176
glib/tests/spawn-singlethread.c
View File

@@ -25,8 +25,14 @@
#include <glib.h>
#include <string.h>
#include <fcntl.h>
#ifdef G_OS_UNIX
#include <glib-unix.h>
#endif
#ifdef G_OS_WIN32
#include <io.h>
#define LINEEND "\r\n"
#else
#define LINEEND "\n"
@@ -156,6 +162,145 @@ test_spawn_async (void)
g_free (arg);
}
/* Windows close() causes failure through the Invalid Parameter Handler
* Routine if the file descriptor does not exist.
*/
static void
sane_close (int fd)
{
if (fd >= 0)
close (fd);
}
/* Test g_spawn_async_with_fds() with a variety of different inputs */
static void
test_spawn_async_with_fds (void)
{
int tnum = 1;
GPtrArray *argv;
char *arg;
int i;
/* Each test has 3 variable parameters: stdin, stdout, stderr */
enum fd_type {
NO_FD, /* don't pass a fd */
PIPE, /* pass fd of new/unique pipe */
STDOUT_PIPE, /* pass the same pipe as stdout */
} tests[][3] = {
{ NO_FD, NO_FD, NO_FD }, /* Test with no fds passed */
{ PIPE, PIPE, PIPE }, /* Test with unique fds passed */
{ NO_FD, PIPE, STDOUT_PIPE }, /* Test the same fd for stdout + stderr */
};
arg = g_strdup_printf ("thread %d", tnum);
argv = g_ptr_array_new ();
g_ptr_array_add (argv, echo_prog_path);
g_ptr_array_add (argv, arg);
g_ptr_array_add (argv, NULL);
for (i = 0; i < G_N_ELEMENTS (tests); i++)
{
GError *error = NULL;
GPid pid;
GMainContext *context;
GMainLoop *loop;
GIOChannel *channel = NULL;
GSource *source;
SpawnAsyncMultithreadedData data;
enum fd_type *fd_info = tests[i];
gint test_pipe[3][2];
int j;
for (j = 0; j < 3; j++)
{
switch (fd_info[j])
{
case NO_FD:
test_pipe[j][0] = -1;
test_pipe[j][1] = -1;
break;
case PIPE:
#ifdef G_OS_UNIX
g_unix_open_pipe (test_pipe[j], FD_CLOEXEC, &error);
g_assert_no_error (error);
#else
g_assert_cmpint (_pipe (test_pipe[j], 4096, _O_BINARY), >=, 0);
#endif
break;
case STDOUT_PIPE:
g_assert_cmpint (j, ==, 2); /* only works for stderr */
test_pipe[j][0] = test_pipe[1][0];
test_pipe[j][1] = test_pipe[1][1];
break;
default:
g_assert_not_reached ();
}
}
context = g_main_context_new ();
loop = g_main_loop_new (context, TRUE);
g_spawn_async_with_fds (NULL, (char**)argv->pdata, NULL,
G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL, &pid,
test_pipe[0][0], test_pipe[1][1], test_pipe[2][1],
&error);
g_assert_no_error (error);
sane_close (test_pipe[0][0]);
sane_close (test_pipe[1][1]);
if (fd_info[2] != STDOUT_PIPE)
sane_close (test_pipe[2][1]);
data.loop = loop;
data.stdout_done = FALSE;
data.child_exited = FALSE;
data.stdout_buf = g_string_new (0);
source = g_child_watch_source_new (pid);
g_source_set_callback (source, (GSourceFunc)on_child_exited, &data, NULL);
g_source_attach (source, context);
g_source_unref (source);
if (test_pipe[1][0] != -1)
{
channel = g_io_channel_unix_new (test_pipe[1][0]);
source = g_io_create_watch (channel, G_IO_IN | G_IO_HUP | G_IO_ERR);
g_source_set_callback (source, (GSourceFunc)on_child_stdout,
&data, NULL);
g_source_attach (source, context);
g_source_unref (source);
}
else
{
/* Don't check stdout data if we didn't pass a fd */
data.stdout_done = TRUE;
}
g_main_loop_run (loop);
g_assert_true (data.child_exited);
if (test_pipe[1][0] != -1)
{
/* Check for echo on stdout */
g_assert_true (data.stdout_done);
g_assert_cmpstr (data.stdout_buf->str, ==, arg);
g_io_channel_unref (channel);
}
g_string_free (data.stdout_buf, TRUE);
g_main_context_unref (context);
g_main_loop_unref (loop);
sane_close (test_pipe[0][1]);
sane_close (test_pipe[1][0]);
if (fd_info[2] != STDOUT_PIPE)
sane_close (test_pipe[2][0]);
}
g_ptr_array_free (argv, TRUE);
g_free (arg);
}
static void
test_spawn_sync (void)
{
@@ -181,6 +326,35 @@ test_spawn_sync (void)
g_ptr_array_free (argv, TRUE);
}
/* Like test_spawn_sync but uses spawn flags that trigger the optimized
* posix_spawn codepath.
*/
static void
test_posix_spawn (void)
{
int tnum = 1;
GError *error = NULL;
GPtrArray *argv;
char *arg;
char *stdout_str;
int estatus;
GSpawnFlags flags = G_SPAWN_CLOEXEC_PIPES | G_SPAWN_LEAVE_DESCRIPTORS_OPEN;
arg = g_strdup_printf ("thread %d", tnum);
argv = g_ptr_array_new ();
g_ptr_array_add (argv, echo_prog_path);
g_ptr_array_add (argv, arg);
g_ptr_array_add (argv, NULL);
g_spawn_sync (NULL, (char**)argv->pdata, NULL, flags, NULL, NULL, &stdout_str, NULL, &estatus, &error);
g_assert_no_error (error);
g_assert_cmpstr (arg, ==, stdout_str);
g_free (arg);
g_free (stdout_str);
g_ptr_array_free (argv, TRUE);
}
static void
test_spawn_script (void)
{
@@ -251,8 +425,10 @@ main (int argc,
g_test_add_func ("/gthread/spawn-single-sync", test_spawn_sync);
g_test_add_func ("/gthread/spawn-single-async", test_spawn_async);
g_test_add_func ("/gthread/spawn-single-async-with-fds", test_spawn_async_with_fds);
g_test_add_func ("/gthread/spawn-script", test_spawn_script);
g_test_add_func ("/gthread/spawn/nonexistent", test_spawn_nonexistent);
g_test_add_func ("/gthread/spawn-posix-spawn", test_posix_spawn);
ret = g_test_run();

5
meson.build
View File

@@ -487,6 +487,11 @@ if cc.has_function('posix_memalign', prefix : '#include <stdlib.h>')
glib_conf.set('HAVE_POSIX_MEMALIGN', 1)
endif
# Check that posix_spawn() is usable; must use header
if cc.has_function('posix_spawn', prefix : '#include <spawn.h>')
glib_conf.set('HAVE_POSIX_SPAWN', 1)
endif
# Check whether strerror_r returns char *
if have_func_strerror_r
if cc.compiles('''#define _GNU_SOURCE