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gtk2/gtk/gtkmountoperation-x11.c
Christian Persch e8dcf330cc Preserve errno, and always use g_strerror() 
Bug #592461.
2009-08-24 15:30:00 +02:00

973 lines
24 KiB
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* GTK - The GIMP Toolkit
* Copyright (C) David Zeuthen <davidz@redhat.com>
* Copyright (C) 2001 Havoc Pennington
* Copyright (C) 2005-2007 Vincent Untz
*
* 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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <gio/gio.h>
#include "x11/gdkx.h"
#include <X11/Xatom.h>
#include <gtk/gtkicontheme.h>
#include "gtkintl.h"
/* for the kill(2) system call and errno - POSIX.1-2001 and later */
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include "gtkmountoperationprivate.h"
#include "gtkalias.h"
/* ---------------------------------------------------------------------------------------------------- */
/* these functions are based on code from libwnck (LGPLv2) */
static gboolean get_window_list (Display *xdisplay,
Window xwindow,
Atom atom,
Window **windows,
int *len);
static char* get_utf8_property (Display *xdisplay,
Window xwindow,
Atom atom);
static gboolean get_cardinal (Display *xdisplay,
Window xwindow,
Atom atom,
int *val);
static gboolean read_rgb_icon (Display *xdisplay,
Window xwindow,
int ideal_width,
int ideal_height,
int *width,
int *height,
guchar **pixdata);
static gboolean
get_cardinal (Display *xdisplay,
Window xwindow,
Atom atom,
int *val)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
gulong *num;
int err, result;
*val = 0;
gdk_error_trap_push ();
type = None;
result = XGetWindowProperty (xdisplay,
xwindow,
atom,
0, G_MAXLONG,
False, XA_CARDINAL, &type, &format, &nitems,
&bytes_after, (void*)&num);
XSync (xdisplay, False);
err = gdk_error_trap_pop ();
if (err != Success ||
result != Success)
return FALSE;
if (type != XA_CARDINAL)
{
XFree (num);
return FALSE;
}
*val = *num;
XFree (num);
return TRUE;
}
static char*
get_utf8_property (Display *xdisplay,
Window xwindow,
Atom atom)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
gchar *val;
int err, result;
char *retval;
Atom utf8_string;
utf8_string = gdk_x11_get_xatom_by_name ("UTF8_STRING");
gdk_error_trap_push ();
type = None;
val = NULL;
result = XGetWindowProperty (xdisplay,
xwindow,
atom,
0, G_MAXLONG,
False, utf8_string,
&type, &format, &nitems,
&bytes_after, (guchar **)&val);
XSync (xdisplay, False);
err = gdk_error_trap_pop ();
if (err != Success ||
result != Success)
return NULL;
if (type != utf8_string ||
format != 8 ||
nitems == 0)
{
if (val)
XFree (val);
return NULL;
}
if (!g_utf8_validate (val, nitems, NULL))
{
g_warning ("Property %s contained invalid UTF-8\n",
gdk_x11_get_xatom_name (atom));
XFree (val);
return NULL;
}
retval = g_strndup (val, nitems);
XFree (val);
return retval;
}
static gboolean
find_largest_sizes (gulong *data,
gulong nitems,
int *width,
int *height)
{
*width = 0;
*height = 0;
while (nitems > 0)
{
int w, h;
gboolean replace;
replace = FALSE;
if (nitems < 3)
return FALSE; /* no space for w, h */
w = data[0];
h = data[1];
if (nitems < ((w * h) + 2))
return FALSE; /* not enough data */
*width = MAX (w, *width);
*height = MAX (h, *height);
data += (w * h) + 2;
nitems -= (w * h) + 2;
}
return TRUE;
}
static gboolean
find_best_size (gulong *data,
gulong nitems,
int ideal_width,
int ideal_height,
int *width,
int *height,
gulong **start)
{
int best_w;
int best_h;
gulong *best_start;
int max_width, max_height;
*width = 0;
*height = 0;
*start = NULL;
if (!find_largest_sizes (data, nitems, &max_width, &max_height))
return FALSE;
if (ideal_width < 0)
ideal_width = max_width;
if (ideal_height < 0)
ideal_height = max_height;
best_w = 0;
best_h = 0;
best_start = NULL;
while (nitems > 0)
{
int w, h;
gboolean replace;
replace = FALSE;
if (nitems < 3)
return FALSE; /* no space for w, h */
w = data[0];
h = data[1];
if (nitems < ((w * h) + 2))
break; /* not enough data */
if (best_start == NULL)
{
replace = TRUE;
}
else
{
/* work with averages */
const int ideal_size = (ideal_width + ideal_height) / 2;
int best_size = (best_w + best_h) / 2;
int this_size = (w + h) / 2;
/* larger than desired is always better than smaller */
if (best_size < ideal_size &&
this_size >= ideal_size)
replace = TRUE;
/* if we have too small, pick anything bigger */
else if (best_size < ideal_size &&
this_size > best_size)
replace = TRUE;
/* if we have too large, pick anything smaller
* but still >= the ideal
*/
else if (best_size > ideal_size &&
this_size >= ideal_size &&
this_size < best_size)
replace = TRUE;
}
if (replace)
{
best_start = data + 2;
best_w = w;
best_h = h;
}
data += (w * h) + 2;
nitems -= (w * h) + 2;
}
if (best_start)
{
*start = best_start;
*width = best_w;
*height = best_h;
return TRUE;
}
else
return FALSE;
}
static void
argbdata_to_pixdata (gulong *argb_data,
int len,
guchar **pixdata)
{
guchar *p;
int i;
*pixdata = g_new (guchar, len * 4);
p = *pixdata;
/* One could speed this up a lot. */
i = 0;
while (i < len)
{
guint argb;
guint rgba;
argb = argb_data[i];
rgba = (argb << 8) | (argb >> 24);
*p = rgba >> 24;
++p;
*p = (rgba >> 16) & 0xff;
++p;
*p = (rgba >> 8) & 0xff;
++p;
*p = rgba & 0xff;
++p;
++i;
}
}
static gboolean
read_rgb_icon (Display *xdisplay,
Window xwindow,
int ideal_width,
int ideal_height,
int *width,
int *height,
guchar **pixdata)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
int result, err;
gulong *data;
gulong *best;
int w, h;
gdk_error_trap_push ();
type = None;
data = NULL;
result = XGetWindowProperty (xdisplay,
xwindow,
gdk_x11_get_xatom_by_name ("_NET_WM_ICON"),
0, G_MAXLONG,
False, XA_CARDINAL, &type, &format, &nitems,
&bytes_after, (void*)&data);
XSync (xdisplay, False);
err = gdk_error_trap_pop ();
if (err != Success ||
result != Success)
return FALSE;
if (type != XA_CARDINAL)
{
XFree (data);
return FALSE;
}
if (!find_best_size (data, nitems,
ideal_width, ideal_height,
&w, &h, &best))
{
XFree (data);
return FALSE;
}
*width = w;
*height = h;
argbdata_to_pixdata (best, w * h, pixdata);
XFree (data);
return TRUE;
}
static void
free_pixels (guchar *pixels, gpointer data)
{
g_free (pixels);
}
static GdkPixbuf*
scaled_from_pixdata (guchar *pixdata,
int w,
int h,
int new_w,
int new_h)
{
GdkPixbuf *src;
GdkPixbuf *dest;
src = gdk_pixbuf_new_from_data (pixdata,
GDK_COLORSPACE_RGB,
TRUE,
8,
w, h, w * 4,
free_pixels,
NULL);
if (src == NULL)
return NULL;
if (w != h)
{
GdkPixbuf *tmp;
int size;
size = MAX (w, h);
tmp = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, size, size);
if (tmp != NULL)
{
gdk_pixbuf_fill (tmp, 0);
gdk_pixbuf_copy_area (src, 0, 0, w, h,
tmp,
(size - w) / 2, (size - h) / 2);
g_object_unref (src);
src = tmp;
}
}
if (w != new_w || h != new_h)
{
dest = gdk_pixbuf_scale_simple (src, new_w, new_h, GDK_INTERP_BILINEAR);
g_object_unref (G_OBJECT (src));
}
else
{
dest = src;
}
return dest;
}
static gboolean
get_window_list (Display *xdisplay,
Window xwindow,
Atom atom,
Window **windows,
int *len)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
Window *data;
int err, result;
*windows = NULL;
*len = 0;
gdk_error_trap_push ();
type = None;
result = XGetWindowProperty (xdisplay,
xwindow,
atom,
0, G_MAXLONG,
False, XA_WINDOW, &type, &format, &nitems,
&bytes_after, (void*)&data);
XSync (xdisplay, False);
err = gdk_error_trap_pop ();
if (err != Success ||
result != Success)
return FALSE;
if (type != XA_WINDOW)
{
XFree (data);
return FALSE;
}
*windows = g_new (Window, nitems);
memcpy (*windows, data, sizeof (Window) * nitems);
*len = nitems;
XFree (data);
return TRUE;
}
/* ---------------------------------------------------------------------------------------------------- */
struct _GtkMountOperationLookupContext
{
/* Hash from pid (gint) -> XID (gint)
*
* Note that XIDs are at most 27 bits - however, also note that sizeof(XID) == 8 on
* x86_64 - that's just xlib brokenness. So it's safe to stuff the XID into a pointer.
*/
GHashTable *pid_to_window;
GdkDisplay *display;
};
GtkMountOperationLookupContext *
_gtk_mount_operation_lookup_context_get (GdkDisplay *display)
{
GtkMountOperationLookupContext *context;
Window *mapping;
gint mapping_length;
gint n;
context = g_new0 (GtkMountOperationLookupContext, 1);
context->pid_to_window = g_hash_table_new (g_direct_hash, g_direct_equal);
context->display = display;
mapping = NULL;
mapping_length = 0;
get_window_list (GDK_DISPLAY_XDISPLAY (context->display),
GDK_ROOT_WINDOW(),
gdk_x11_get_xatom_by_name_for_display (context->display,
"_NET_CLIENT_LIST"),
&mapping,
&mapping_length);
for (n = 0; n < mapping_length; n++)
{
gint pid;
if (!get_cardinal (GDK_DISPLAY_XDISPLAY (context->display),
mapping[n],
gdk_x11_get_xatom_by_name_for_display (context->display,
"_NET_WM_PID"),
&pid))
continue;
g_hash_table_insert (context->pid_to_window,
GINT_TO_POINTER (pid),
GINT_TO_POINTER ((gint) mapping[n]));
}
g_free (mapping);
return context;
}
void
_gtk_mount_operation_lookup_context_free (GtkMountOperationLookupContext *context)
{
g_hash_table_unref (context->pid_to_window);
g_free (context);
}
/* ---------------------------------------------------------------------------------------------------- */
#ifdef __linux__
static GPid
pid_get_parent (GPid pid)
{
GPid ppid;
gchar **tokens;
gchar *stat_filename;
gchar *stat_contents;
gsize stat_len;
ppid = 0;
tokens = NULL;
stat_contents = NULL;
stat_filename = NULL;
/* fail if trying to get the parent of the init process (no such thing) */
if (pid == 1)
goto out;
stat_filename = g_strdup_printf ("/proc/%d/status", pid);
if (g_file_get_contents (stat_filename,
&stat_contents,
&stat_len,
NULL))
{
guint n;
tokens = g_strsplit (stat_contents, "\n", 0);
for (n = 0; tokens[n] != NULL; n++)
{
if (g_str_has_prefix (tokens[n], "PPid:"))
{
gchar *endp;
endp = NULL;
ppid = strtoll (tokens[n] + sizeof "PPid:" - 1, &endp, 10);
if (endp == NULL || *endp != '\0')
{
g_warning ("Error parsing contents of `%s'. Parent pid is malformed.",
stat_filename);
ppid = 0;
goto out;
}
break;
}
}
}
out:
g_strfreev (tokens);
g_free (stat_contents);
g_free (stat_filename);
return ppid;
}
static gchar *
pid_get_env (GPid pid,
const gchar *key)
{
gchar *ret;
gchar *env_filename;
gchar *env;
gsize env_len;
gsize key_len;
gchar *end;
ret = NULL;
key_len = strlen (key);
env_filename = g_strdup_printf ("/proc/%d/environ", pid);
if (g_file_get_contents (env_filename,
&env,
&env_len,
NULL))
{
guint n;
/* /proc/<pid>/environ in Linux is split at '\0' points, g_strsplit() can't handle that... */
n = 0;
while (TRUE)
{
if (env[n] == '\0' || n >= env_len)
break;
if (g_str_has_prefix (env + n, key) && (*(env + n + key_len) == '='))
{
ret = g_strdup (env + n + key_len + 1);
/* skip invalid UTF-8 */
if (!g_utf8_validate (ret, -1, (const gchar *) &end))
*end = '\0';
break;
}
for (; env[n] != '\0' && n < env_len; n++)
;
n++;
}
g_free (env);
}
g_free (env_filename);
return ret;
}
static gchar *
pid_get_command_line (GPid pid)
{
gchar *cmdline_filename;
gchar *cmdline_contents;
gsize cmdline_len;
guint n;
gchar *end;
cmdline_contents = NULL;
cmdline_filename = g_strdup_printf ("/proc/%d/cmdline", pid);
if (!g_file_get_contents (cmdline_filename,
&cmdline_contents,
&cmdline_len,
NULL))
goto out;
/* /proc/<pid>/cmdline separates args by NUL-bytes - replace with spaces */
for (n = 0; n < cmdline_len - 1; n++)
{
if (cmdline_contents[n] == '\0')
cmdline_contents[n] = ' ';
}
/* skip invalid UTF-8 */
if (!g_utf8_validate (cmdline_contents, -1, (const gchar *) &end))
*end = '\0';
out:
g_free (cmdline_filename);
return cmdline_contents;
}
/* ---------------------------------------------------------------------------------------------------- */
#else
/* TODO: please implement for your OS - must return valid UTF-8 */
static GPid
pid_get_parent (GPid pid)
{
return 0;
}
static gchar *
pid_get_env (GPid pid,
const gchar *key)
{
return NULL;
}
static gchar *
pid_get_command_line (GPid pid)
{
return NULL;
}
#endif
/* ---------------------------------------------------------------------------------------------------- */
static gchar *
get_name_for_window_with_pid (GtkMountOperationLookupContext *context,
GPid pid)
{
Window window;
Window windowid_window;
gchar *ret;
ret = NULL;
window = GPOINTER_TO_INT (g_hash_table_lookup (context->pid_to_window, GINT_TO_POINTER (pid)));
if (window == None)
{
gchar *windowid_value;
/* check for $WINDOWID (set by terminals) and see if we can get the title that way */
windowid_value = pid_get_env (pid, "WINDOWID");
if (windowid_value != NULL)
{
gchar *endp;
endp = NULL;
windowid_window = (Window) g_ascii_strtoll (windowid_value, &endp, 10);
if (endp != NULL || *endp == '\0')
{
window = windowid_window;
}
g_free (windowid_value);
}
/* otherwise, check for parents */
if (window == None)
{
do
{
pid = pid_get_parent (pid);
if (pid == 0)
break;
window = GPOINTER_TO_INT (g_hash_table_lookup (context->pid_to_window, GINT_TO_POINTER (pid)));
if (window != None)
break;
}
while (TRUE);
}
}
if (window != None)
{
ret = get_utf8_property (GDK_DISPLAY_XDISPLAY (context->display),
window,
gdk_x11_get_xatom_by_name_for_display (context->display,
"_NET_WM_NAME"));
if (ret == NULL)
ret = get_utf8_property (GDK_DISPLAY_XDISPLAY (context->display),
window, gdk_x11_get_xatom_by_name_for_display (context->display,
"_NET_WM_ICON_NAME"));
}
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static GdkPixbuf *
get_pixbuf_for_window_with_pid (GtkMountOperationLookupContext *context,
GPid pid,
gint size_pixels)
{
Window window;
GdkPixbuf *ret;
ret = NULL;
window = GPOINTER_TO_INT (g_hash_table_lookup (context->pid_to_window, GINT_TO_POINTER (pid)));
if (window == None)
{
/* otherwise, check for parents */
do
{
pid = pid_get_parent (pid);
if (pid == 0)
break;
window = GPOINTER_TO_INT (g_hash_table_lookup (context->pid_to_window, GINT_TO_POINTER (pid)));
if (window != None)
break;
}
while (TRUE);
}
if (window != None)
{
gint width;
gint height;
guchar *pixdata;
if (read_rgb_icon (GDK_DISPLAY_XDISPLAY (context->display),
window,
size_pixels, size_pixels,
&width, &height,
&pixdata))
{
/* steals pixdata */
ret = scaled_from_pixdata (pixdata,
width, height,
size_pixels, size_pixels);
}
}
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
static const gchar *well_known_commands[] =
{
/* translators: this string is a name for the 'less' command */
"less", N_("Terminal Pager"),
"top", N_("Top Command"),
"bash", N_("Bourne Again Shell"),
"sh", N_("Bourne Shell"),
"zsh", N_("Z Shell"),
NULL,
};
gboolean
_gtk_mount_operation_lookup_info (GtkMountOperationLookupContext *context,
GPid pid,
gint size_pixels,
gchar **out_name,
gchar **out_command_line,
GdkPixbuf **out_pixbuf)
{
g_return_val_if_fail (out_name != NULL && *out_name == NULL, FALSE);
g_return_val_if_fail (out_command_line != NULL && *out_command_line == NULL, FALSE);
g_return_val_if_fail (out_pixbuf != NULL && *out_pixbuf == NULL, FALSE);
/* We perform two different lookups for name and icon size.. this is
* because we want the name from the window with WINDOWID and this
* normally does not give you an icon
*
* (the canonical example is a tab in gnome-terminal - the shell/command running
* in the shell will have WINDOWID set - but this window won't have an icon - so
* we want to continue up until the gnome-terminal window so we can get that icon)
*/
*out_command_line = pid_get_command_line (pid);
*out_name = get_name_for_window_with_pid (context, pid);
*out_pixbuf = get_pixbuf_for_window_with_pid (context, pid, size_pixels);
/* if we didn't manage to find the name via X, fall back to the basename
* of the first element of the command line and, for maximum geek-comfort,
* map a few well-known commands to proper translated names
*/
if (*out_name == NULL && *out_command_line != NULL &&
strlen (*out_command_line) > 0 && (*out_command_line)[0] != ' ')
{
guint n;
gchar *s;
gchar *p;
/* find the first character after the first argument */
s = strchr (*out_command_line, ' ');
if (s == NULL)
s = *out_command_line + strlen (*out_command_line);
for (p = s; p > *out_command_line; p--)
{
if (*p == '/')
{
p++;
break;
}
}
*out_name = g_strndup (p, s - p);
for (n = 0; well_known_commands[n] != NULL; n += 2)
{
/* sometimes the command is prefixed with a -, e.g. '-bash' instead
* of 'bash' - handle that as well
*/
if ((strcmp (well_known_commands[n], *out_name) == 0) ||
((*out_name)[0] == '-' && (strcmp (well_known_commands[n], (*out_name) + 1) == 0)))
{
g_free (*out_name);
*out_name = g_strdup (_(well_known_commands[n+1]));
break;
}
}
}
return TRUE;
}
gboolean
_gtk_mount_operation_kill_process (GPid pid,
GError **error)
{
gboolean ret;
ret = TRUE;
if (kill ((pid_t) pid, SIGTERM) != 0)
{
int errsv = errno;
/* TODO: On EPERM, we could use a setuid helper using polkit (very easy to implement
* via pkexec(1)) to allow the user to e.g. authenticate to gain the authorization
* to kill the process. But that's not how things currently work.
*/
ret = FALSE;
g_set_error (error,
G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Cannot end process with pid %d: %s"),
pid,
g_strerror (errsv));
}
return ret;
}
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