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
  24 #include <gstdio.h>
  25 #include <errno.h>
  26 #include <locale.h>
  27
  28 static gboolean
  29 is_valid_module_name (const gchar *basename)
  30 {
  31 #if !defined(G_OS_WIN32) && !defined(G_WITH_CYGWIN)
  32   return
  33     g_str_has_prefix (basename, "lib") &&
  34     g_str_has_suffix (basename, ".so");
  35 #else
  36   return g_str_has_suffix (basename, ".dll");
  37 #endif
  38 }
  39
  40 static void
  41 query_dir (const char *dirname)
  42 {
  43   GString *data;
  44   GDir *dir;
  45   GList *list = NULL, *iterator = NULL;
  46   const char *name;
  47   char *cachename;
  48   char **(* query)  (void);
  49   GError *error;
  50   int i;
  51
  52   if (!g_module_supported ())
  53     return;
  54
  55   error = NULL;
  56   dir = g_dir_open (dirname, 0, &error);
  57   if (!dir)
  58     {
  59       g_printerr ("Unable to open directory %s: %s\n", dirname, error->message);
  60       g_error_free (error);
  61       return;
  62     }
  63
  64   data = g_string_new ("");
  65
  66   while ((name = g_dir_read_name (dir)))
  67     list = g_list_prepend (list, g_strdup (name));
  68
  69   list = g_list_sort (list, (GCompareFunc) g_strcmp0);
  70   for (iterator = list; iterator; iterator = iterator->next)
  71     {
  72       GModule *module;
  73       gchar     *path;
  74       char **extension_points;
  75
  76       name = iterator->data;
  77       if (!is_valid_module_name (name))
  78         continue;
  79
  80       path = g_build_filename (dirname, name, NULL);
  81       module = g_module_open (path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
  82       g_free (path);
  83
  84       if (module)
  85         {
  86           g_module_symbol (module, "g_io_module_query", (gpointer) &query);
  87
  88           if (query)
  89             {
  90               extension_points = query ();
  91
  92               if (extension_points)
  93                 {
  94                   g_string_append_printf (data, "%s: ", name);
  95
  96                   for (i = 0; extension_points[i] != NULL; i++)
  97                     g_string_append_printf (data, "%s%s", i == 0 ? "" : ",", extension_points[i]);
  98
  99                   g_string_append (data, "\n");
 100                   g_strfreev (extension_points);
 101                 }
 102             }
 103
 104           g_module_close (module);
 105         }
 106     }
 107
 108   g_dir_close (dir);
 109   g_list_free_full (list, g_free);
 110
 111   cachename = g_build_filename (dirname, "giomodule.cache", NULL);
 112
 113   if (data->len > 0)
 114     {
 115       error = NULL;
 116
 117       if (!g_file_set_contents (cachename, data->str, data->len, &error))
 118         {
 119           g_printerr ("Unable to create %s: %s\n", cachename, error->message);
 120           g_error_free (error);
 121         }
 122     }
 123   else
 124     {
 125       if (g_unlink (cachename) != 0 && errno != ENOENT)
 126         {
 127           int errsv = errno;
 128           g_printerr ("Unable to unlink %s: %s\n", cachename, g_strerror (errsv));
 129         }
 130     }
 131
 132   g_free (cachename);
 133   g_string_free (data, TRUE);
 134 }
 135
 136 int
 137 main (gint   argc,
 138       gchar *argv[])
 139 {
 140   int i;
 141
 142   if (argc == 1)
 143     {
 144       g_print ("Usage: gio-querymodules <directory1> [<directory2> ...]\n");
 145       g_print ("Will update giomodule.cache in the listed directories\n");
 146       return 1;
 147     }
 148
 149   setlocale (LC_ALL, "");
 150
 151   /* Be defensive and ensure we're linked to GObject */
 152   g_type_ensure (G_TYPE_OBJECT);
 153
 154   for (i = 1; i < argc; i++)
 155     query_dir (argv[i]);
 156
 157   return 0;
 158 }