gio/gio-querymodules.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Alexander Larsson <alexl@redhat.com>
  19  */
  20
  21 #include "config.h"
  22 #include "giomodule.h"
  23 #include "giomodule-priv.h"
  24
  25 #include <gstdio.h>
  26 #include <errno.h>
  27 #include <locale.h>
  28
  29 static gboolean
  30 is_valid_module_name (const gchar *basename)
  31 {
  32 #if !defined(G_OS_WIN32) && !defined(G_WITH_CYGWIN)
  33   return
  34     g_str_has_prefix (basename, "lib") &&
  35     g_str_has_suffix (basename, ".so");
  36 #else
  37   return g_str_has_suffix (basename, ".dll");
  38 #endif
  39 }
  40
  41 static void
  42 query_dir (const char *dirname)
  43 {
  44   GString *data;
  45   GDir *dir;
  46   GList *list = NULL, *iterator = NULL;
  47   const char *name;
  48   char *cachename;
  49   char **(* query)  (void);
  50   GError *error;
  51   int i;
  52
  53   if (!g_module_supported ())
  54     return;
  55
  56   error = NULL;
  57   dir = g_dir_open (dirname, 0, &error);
  58   if (!dir)
  59     {
  60       g_printerr ("Unable to open directory %s: %s\n", dirname, error->message);
  61       g_error_free (error);
  62       return;
  63     }
  64
  65   data = g_string_new ("");
  66
  67   while ((name = g_dir_read_name (dir)))
  68     list = g_list_prepend (list, g_strdup (name));
  69
  70   list = g_list_sort (list, (GCompareFunc) g_strcmp0);
  71   for (iterator = list; iterator; iterator = iterator->next)
  72     {
  73       GModule *module;
  74       gchar     *path;
  75       char **extension_points;
  76
  77       name = iterator->data;
  78       if (!is_valid_module_name (name))
  79         continue;
  80
  81       path = g_build_filename (dirname, name, NULL);
  82       module = g_module_open (path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
  83       g_free (path);
  84
  85       if (module)
  86         {
  87           gchar *modulename;
  88           gchar *symname;
  89
  90           modulename = _g_io_module_extract_name (name);
  91           symname = g_strconcat ("g_io_", modulename, "_query", NULL);
  92           g_module_symbol (module, symname, (gpointer) &query);
  93           g_free (symname);
  94           g_free (modulename);
  95
  96           if (!query)
  97             {
  98               /* Fallback to old name */
  99               g_module_symbol (module, "g_io_module_query", (gpointer) &query);
 100             }
 101
 102           if (query)
 103             {
 104               extension_points = query ();
 105
 106               if (extension_points)
 107                 {
 108                   g_string_append_printf (data, "%s: ", name);
 109
 110                   for (i = 0; extension_points[i] != NULL; i++)
 111                     g_string_append_printf (data, "%s%s", i == 0 ? "" : ",", extension_points[i]);
 112
 113                   g_string_append (data, "\n");
 114                   g_strfreev (extension_points);
 115                 }
 116             }
 117
 118           g_module_close (module);
 119         }
 120     }
 121
 122   g_dir_close (dir);
 123   g_list_free_full (list, g_free);
 124
 125   cachename = g_build_filename (dirname, "giomodule.cache", NULL);
 126
 127   if (data->len > 0)
 128     {
 129       error = NULL;
 130
 131       if (!g_file_set_contents (cachename, data->str, data->len, &error))
 132         {
 133           g_printerr ("Unable to create %s: %s\n", cachename, error->message);
 134           g_error_free (error);
 135         }
 136     }
 137   else
 138     {
 139       if (g_unlink (cachename) != 0 && errno != ENOENT)
 140         {
 141           int errsv = errno;
 142           g_printerr ("Unable to unlink %s: %s\n", cachename, g_strerror (errsv));
 143         }
 144     }
 145
 146   g_free (cachename);
 147   g_string_free (data, TRUE);
 148 }
 149
 150 int
 151 main (gint   argc,
 152       gchar *argv[])
 153 {
 154   int i;
 155
 156   if (argc == 1)
 157     {
 158       g_print ("Usage: gio-querymodules <directory1> [<directory2> ...]\n");
 159       g_print ("Will update giomodule.cache in the listed directories\n");
 160       return 1;
 161     }
 162
 163   setlocale (LC_ALL, "");
 164
 165   /* Be defensive and ensure we're linked to GObject */
 166   g_type_ensure (G_TYPE_OBJECT);
 167
 168   for (i = 1; i < argc; i++)
 169     query_dir (argv[i]);
 170
 171   return 0;
 172 }