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5cddde1fb2
Prevent the situation where errno is set by function A, then function B
is called (which is typically _(), but could be anything else) and it
overwrites errno, then errno is checked by the caller.
errno is a horrific API, and we need to be careful to save its value as
soon as a function call (which might set it) returns. i.e. Follow the
pattern:
int errsv, ret;
ret = some_call_which_might_set_errno ();
errsv = errno;
if (ret < 0)
puts (strerror (errsv));
This patch implements that pattern throughout GLib. There might be a few
places in the test code which still use errno directly. They should be
ported as necessary. It doesn’t modify all the call sites like this:
if (some_call_which_might_set_errno () && errno == ESOMETHING)
since the refactoring involved is probably more harmful than beneficial
there. It does, however, refactor other call sites regardless of whether
they were originally buggy.
https://bugzilla.gnome.org/show_bug.cgi?id=785577
152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include "giomodule.h"
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#include <gstdio.h>
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#include <errno.h>
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#include <locale.h>
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static gboolean
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is_valid_module_name (const gchar *basename)
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{
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#if !defined(G_OS_WIN32) && !defined(G_WITH_CYGWIN)
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return
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g_str_has_prefix (basename, "lib") &&
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g_str_has_suffix (basename, ".so");
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#else
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return g_str_has_suffix (basename, ".dll");
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#endif
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}
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static void
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query_dir (const char *dirname)
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{
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GString *data;
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GDir *dir;
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const char *name;
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char *cachename;
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char **(* query) (void);
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GError *error;
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int i;
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if (!g_module_supported ())
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return;
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error = NULL;
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dir = g_dir_open (dirname, 0, &error);
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if (!dir)
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{
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g_printerr ("Unable to open directory %s: %s\n", dirname, error->message);
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g_error_free (error);
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return;
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}
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data = g_string_new ("");
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while ((name = g_dir_read_name (dir)))
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{
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GModule *module;
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gchar *path;
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char **extension_points;
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if (!is_valid_module_name (name))
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continue;
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path = g_build_filename (dirname, name, NULL);
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module = g_module_open (path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
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g_free (path);
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if (module)
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{
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g_module_symbol (module, "g_io_module_query", (gpointer) &query);
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if (query)
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{
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extension_points = query ();
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if (extension_points)
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{
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g_string_append_printf (data, "%s: ", name);
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for (i = 0; extension_points[i] != NULL; i++)
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g_string_append_printf (data, "%s%s", i == 0 ? "" : ",", extension_points[i]);
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g_string_append (data, "\n");
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g_strfreev (extension_points);
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}
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}
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g_module_close (module);
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}
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}
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g_dir_close (dir);
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cachename = g_build_filename (dirname, "giomodule.cache", NULL);
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if (data->len > 0)
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{
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error = NULL;
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if (!g_file_set_contents (cachename, data->str, data->len, &error))
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{
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g_printerr ("Unable to create %s: %s\n", cachename, error->message);
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g_error_free (error);
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}
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}
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else
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{
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if (g_unlink (cachename) != 0 && errno != ENOENT)
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{
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int errsv = errno;
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g_printerr ("Unable to unlink %s: %s\n", cachename, g_strerror (errsv));
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}
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}
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g_free (cachename);
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g_string_free (data, TRUE);
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}
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int
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main (gint argc,
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gchar *argv[])
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{
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int i;
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if (argc == 1)
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{
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g_print ("Usage: gio-querymodules <directory1> [<directory2> ...]\n");
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g_print ("Will update giomodule.cache in the listed directories\n");
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return 1;
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}
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setlocale (LC_ALL, "");
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/* Be defensive and ensure we're linked to GObject */
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g_type_ensure (G_TYPE_OBJECT);
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for (i = 1; i < argc; i++)
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query_dir (argv[i]);
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return 0;
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}
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