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 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, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24 #include "giomodule.h"
  25
  26 #include <gstdio.h>
  27 #include <errno.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   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     {
  68       GModule *module;
  69       gchar     *path;
  70       char **extension_points;
  71
  72       if (!is_valid_module_name (name))
  73         continue;
  74
  75       path = g_build_filename (dirname, name, NULL);
  76       module = g_module_open (path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
  77       g_free (path);
  78
  79       if (module)
  80         {
  81           g_module_symbol (module, "g_io_module_query", (gpointer) &query);
  82
  83           if (query)
  84             {
  85               extension_points = query ();
  86
  87               if (extension_points)
  88                 {
  89                   g_string_append_printf (data, "%s: ", name);
  90
  91                   for (i = 0; extension_points[i] != NULL; i++)
  92                     g_string_append_printf (data, "%s%s", i == 0 ? "" : ",", extension_points[i]);
  93
  94                   g_string_append (data, "\n");
  95                   g_strfreev (extension_points);
  96                 }
  97             }
  98
  99           g_module_close (module);
 100         }
 101     }
 102
 103   g_dir_close (dir);
 104
 105   cachename = g_build_filename (dirname, "giomodule.cache", NULL);
 106
 107   if (data->len > 0)
 108     {
 109       error = NULL;
 110
 111       if (!g_file_set_contents (cachename, data->str, data->len, &error))
 112         {
 113           g_printerr ("Unable to create %s: %s\n", cachename, error->message);
 114           g_error_free (error);
 115         }
 116     }
 117   else
 118     {
 119       if (g_unlink (cachename) != 0 && errno != ENOENT)
 120         g_printerr ("Unable to unlink %s: %s\n", cachename, g_strerror (errno));
 121     }
 122
 123   g_string_free (data, TRUE);
 124 }
 125
 126 int
 127 main (gint   argc,
 128       gchar *argv[])
 129 {
 130   int i;
 131
 132   g_type_init ();
 133
 134   if (argc == 1)
 135     {
 136       g_print ("Usage: gio-querymodules <directory1> [<directory2> ...]\n");
 137       g_print ("Will update giomodule.cache in the listed directories\n");
 138       return 1;
 139     }
 140
 141   for (i = 1; i < argc; i++)
 142     query_dir (argv[i]);
 143
 144   return 0;
 145 }