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implementing segfault handler for plugin loading
Original commit message from CVS: implementing segfault handler for plugin loading
This commit is contained in:
Thomas Vander Stichele
parent
7943699850
commit
a4f74f5eb4
3 changed files with 100 additions and 3 deletions
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@ -1,3 +1,12 @@
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2003-12-15 Thomas Vander Stichele <thomas at apestaart dot org>
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* gst/gst.c: (init_popt_callback):
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* gst/gstplugin.c: (_gst_plugin_fault_handler_restore),
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(_gst_plugin_fault_handler_sighandler),
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(_gst_plugin_fault_handler_setup), (gst_plugin_load_file):
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Implemented fault handlers for catching SIGSEGV while loading
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plug-ins
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2003-12-02 Thomas Vander Stichele <thomas at apestaart dot org>
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* fix documentation build using docbook2..., works on fc1 and rh9
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@ -55,6 +55,9 @@ static gboolean gst_initialized = FALSE;
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static gboolean _gst_initialization_failure = FALSE;
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extern gint _gst_trace_on;
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/* set to TRUE when segfaults need to be left as is */
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gboolean _gst_enable_segfault = FALSE;
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extern GThreadFunctions gst_thread_dummy_functions;
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@ -96,6 +99,7 @@ enum {
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ARG_PLUGIN_SPEW,
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ARG_PLUGIN_PATH,
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ARG_PLUGIN_LOAD,
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ARG_SEGFAULT_ENABLE,
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ARG_SCHEDULER,
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ARG_REGISTRY
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};
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@ -122,6 +126,7 @@ static const struct poptOption gstreamer_options[] = {
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{"gst-plugin-spew", NUL, POPT_ARG_NONE|POPT_ARGFLAG_STRIP, NULL, ARG_PLUGIN_SPEW, N_("enable verbose plugin loading diagnostics"), NULL},
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{"gst-plugin-path", NUL, POPT_ARG_STRING|POPT_ARGFLAG_STRIP, NULL, ARG_PLUGIN_PATH, N_("'" G_SEARCHPATH_SEPARATOR_S "'--separated path list for loading plugins"), "PATHS"},
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{"gst-plugin-load", NUL, POPT_ARG_STRING|POPT_ARGFLAG_STRIP, NULL, ARG_PLUGIN_LOAD, N_("comma-separated list of plugins to preload in addition to the list stored in env variable GST_PLUGIN_PATH"), "PLUGINS"},
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{"gst-enable-segfault",NUL, POPT_ARG_NONE|POPT_ARGFLAG_STRIP, NULL, ARG_SEGFAULT_ENABLE,N_("enable receiving of segmentation faults during plugin loading"), NULL},
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{"gst-scheduler", NUL, POPT_ARG_STRING|POPT_ARGFLAG_STRIP, NULL, ARG_SCHEDULER, N_("scheduler to use ('"GST_SCHEDULER_DEFAULT_NAME"' is the default)"), "SCHEDULER"},
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{"gst-registry", NUL, POPT_ARG_STRING|POPT_ARGFLAG_STRIP, NULL, ARG_REGISTRY, N_("registry to use") , "REGISTRY"},
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POPT_TABLEEND
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@ -700,6 +705,9 @@ init_popt_callback (poptContext context, enum poptCallbackReason reason,
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case ARG_PLUGIN_LOAD:
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split_and_iterate (arg, ",", prepare_for_load_plugin_func, NULL);
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break;
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case ARG_SEGFAULT_ENABLE:
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_gst_enable_segfault = TRUE;
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break;
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case ARG_SCHEDULER:
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gst_scheduler_factory_set_default_name (arg);
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break;
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@ -24,6 +24,7 @@
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <signal.h>
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#include "gst_private.h"
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@ -39,6 +40,11 @@
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static GModule *main_module = NULL;
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static GList *_gst_plugin_static = NULL;
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/* static variables for segfault handling of plugin loading */
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static char *_gst_plugin_fault_handler_filename = NULL;
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extern gboolean *_gst_enable_segfault; /* see gst.c */
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static gboolean *_gst_plugin_fault_handler_is_setup = FALSE;
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/* list of valid licenses.
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* One of these must be specified or the plugin won't be loaded
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* Contact gstreamer-devel@lists.sourceforge.net if your license should be
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@ -194,6 +200,71 @@ gst_plugin_register_func (GstPlugin *plugin, GModule *module, GstPluginDesc *des
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return plugin;
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}
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/**
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* _gst_plugin_fault_handler_restore:
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* segfault handler restorer
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*/
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static void
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_gst_plugin_fault_handler_restore (void)
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{
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struct sigaction action;
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memset (&action, 0, sizeof (action));
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action.sa_handler = SIG_DFL;
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sigaction (SIGSEGV, &action, NULL);
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}
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/**
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* _gst_plugin_fault_handler_sighandler:
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* segfault handler implementation
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*/
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static void
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_gst_plugin_fault_handler_sighandler (int signum)
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{
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/* We need to restore the fault handler or we'll keep getting it */
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_gst_plugin_fault_handler_restore ();
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switch (signum)
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{
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case SIGSEGV:
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g_print ("\nERROR:");
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g_print ("Caught a segmentation fault while loading plugin file:\n");
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g_print ("%s\n\n", _gst_plugin_fault_handler_filename);
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g_print ("Please either:\n");
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g_print ("- remove it and restart.\n");
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g_print ("- run with --gst-enable-segfault and debug.\n");
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exit (-1);
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break;
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default:
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g_print ("Caught unhandled signal on plugin loading\n");
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break;
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}
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}
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/**
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* _gst_plugin_fault_handler_setup:
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* sets up the segfault handler
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*/
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static void
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_gst_plugin_fault_handler_setup (void)
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{
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struct sigaction action;
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/* if asked to leave segfaults alone, just return */
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if (_gst_enable_segfault) return;
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if (_gst_plugin_fault_handler_is_setup) return;
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memset (&action, 0, sizeof (action));
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action.sa_handler = _gst_plugin_fault_handler_sighandler;
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sigaction (SIGSEGV, &action, NULL);
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}
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static void
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_gst_plugin_fault_handler_setup ();
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/**
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* gst_plugin_load_file:
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* @plugin: The plugin to load
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@ -201,7 +272,7 @@ gst_plugin_register_func (GstPlugin *plugin, GModule *module, GstPluginDesc *des
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*
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* Load the given plugin.
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*
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* Returns: a new GstPlugin or NULL, if an error occured
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* Returns: a new GstPlugin or NULL, if an error occurred.
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*/
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GstPlugin *
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gst_plugin_load_file (const gchar *filename, GError **error)
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@ -229,8 +300,8 @@ gst_plugin_load_file (const gchar *filename, GError **error)
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GST_PLUGIN_ERROR,
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GST_PLUGIN_ERROR_MODULE,
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"Problem opening file %s\n",
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filename);
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return FALSE;
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filename);
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return NULL;
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}
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module = g_module_open (filename, G_MODULE_BIND_LAZY);
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@ -278,10 +349,19 @@ gst_plugin_load_file (const gchar *filename, GError **error)
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desc->name);
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}
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/* this is where we load the actual .so, so let's trap SIGSEGV */
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_gst_plugin_fault_handler_setup ();
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_gst_plugin_fault_handler_filename = plugin->filename;
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if (gst_plugin_register_func (plugin, module, desc)) {
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/* remove signal handler */
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_gst_plugin_fault_handler_restore ();
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_gst_plugin_fault_handler_filename = NULL;
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GST_INFO ("plugin \"%s\" loaded", plugin->filename);
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return plugin;
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} else {
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/* remove signal handler */
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_gst_plugin_fault_handler_restore ();
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GST_DEBUG ("gst_plugin_register_func failed for plugin \"%s\"", filename);
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/* plugin == NULL */
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g_set_error (error,
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