/* GStreamer * Copyright (C) 2008 Jan Schmidt * * gstpluginloader.c: GstPluginLoader helper for loading plugin files * out of process. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #ifndef G_OS_WIN32 #include #include #include #include #include #else #define fsync(fd) _commit(fd) #include #endif #include #include #include #include #include #include #include /* IMPORTANT: Bump the version number if the plugin loader packet protocol * changes. Changes in the binary registry format itself are handled by * bumping the GST_MAGIC_BINARY_VERSION_STR */ static const guint32 loader_protocol_version = 3; #define GST_CAT_DEFAULT GST_CAT_PLUGIN_LOADING static GstPluginLoader *plugin_loader_new (GstRegistry * registry); static gboolean plugin_loader_free (GstPluginLoader * loader); static gboolean plugin_loader_load (GstPluginLoader * loader, const gchar * filename, off_t file_size, time_t file_mtime); const GstPluginLoaderFuncs _priv_gst_plugin_loader_funcs = { plugin_loader_new, plugin_loader_free, plugin_loader_load }; typedef struct _PendingPluginEntry { guint32 tag; gchar *filename; off_t file_size; time_t file_mtime; } PendingPluginEntry; struct _GstPluginLoader { GstRegistry *registry; GstPoll *fdset; gboolean child_running; GPid child_pid; GstPollFD fd_w; GstPollFD fd_r; gboolean is_child; gboolean got_plugin_details; /* Transmit buffer */ guint8 *tx_buf; guint tx_buf_size; guint tx_buf_write; guint tx_buf_read; guint32 next_tag; guint8 *rx_buf; guint rx_buf_size; gboolean rx_done; gboolean rx_got_sync; /* Head and tail of the pending plugins list. List of PendingPluginEntry structs */ GList *pending_plugins; GList *pending_plugins_tail; }; #define PACKET_EXIT 1 #define PACKET_LOAD_PLUGIN 2 #define PACKET_SYNC 3 #define PACKET_PLUGIN_DETAILS 4 #define PACKET_VERSION 5 #define BUF_INIT_SIZE 512 #define BUF_GROW_EXTRA 512 #define BUF_MAX_SIZE (32 * 1024 * 1024) #define HEADER_SIZE 12 /* 4 magic hex bytes to mark each packet */ #define HEADER_MAGIC 0xbefec0ae #define ALIGNMENT (sizeof (void *)) static gboolean gst_plugin_loader_spawn (GstPluginLoader * loader); static void put_packet (GstPluginLoader * loader, guint type, guint32 tag, const guint8 * payload, guint32 payload_len); static gboolean exchange_packets (GstPluginLoader * l); static gboolean plugin_loader_replay_pending (GstPluginLoader * l); static gboolean plugin_loader_load_and_sync (GstPluginLoader * l, PendingPluginEntry * entry); static void plugin_loader_create_blacklist_plugin (GstPluginLoader * l, PendingPluginEntry * entry); static void plugin_loader_cleanup_child (GstPluginLoader * loader); static gboolean plugin_loader_sync_with_child (GstPluginLoader * l); static GstPluginLoader * plugin_loader_new (GstRegistry * registry) { GstPluginLoader *l = g_new0 (GstPluginLoader, 1); if (registry) l->registry = gst_object_ref (registry); l->fdset = gst_poll_new (FALSE); gst_poll_fd_init (&l->fd_w); gst_poll_fd_init (&l->fd_r); l->tx_buf_size = BUF_INIT_SIZE; l->tx_buf = g_malloc (BUF_INIT_SIZE); l->next_tag = 0; l->rx_buf_size = BUF_INIT_SIZE; l->rx_buf = g_malloc (BUF_INIT_SIZE); return l; } static gboolean plugin_loader_free (GstPluginLoader * loader) { GList *cur; gboolean got_plugin_details; fsync (loader->fd_w.fd); if (loader->child_running) { put_packet (loader, PACKET_EXIT, 0, NULL, 0); /* Swap packets with the child until it exits cleanly */ while (!loader->rx_done) { if (exchange_packets (loader) || loader->rx_done) continue; if (!plugin_loader_replay_pending (loader)) break; put_packet (loader, PACKET_EXIT, 0, NULL, 0); } plugin_loader_cleanup_child (loader); } else { close (loader->fd_w.fd); close (loader->fd_r.fd); } gst_poll_free (loader->fdset); g_free (loader->rx_buf); g_free (loader->tx_buf); if (loader->registry) gst_object_unref (loader->registry); got_plugin_details = loader->got_plugin_details; /* Free any pending plugin entries */ cur = loader->pending_plugins; while (cur) { PendingPluginEntry *entry = (PendingPluginEntry *) (cur->data); g_free (entry->filename); g_free (entry); cur = g_list_delete_link (cur, cur); } g_free (loader); return got_plugin_details; } static gboolean plugin_loader_load (GstPluginLoader * loader, const gchar * filename, off_t file_size, time_t file_mtime) { gint len; PendingPluginEntry *entry; if (!gst_plugin_loader_spawn (loader)) return FALSE; /* Send a packet to the child requesting that it load the given file */ GST_LOG_OBJECT (loader->registry, "Sending file %s to child. tag %u", filename, loader->next_tag); entry = g_new (PendingPluginEntry, 1); entry->tag = loader->next_tag++; entry->filename = g_strdup (filename); entry->file_size = file_size; entry->file_mtime = file_mtime; loader->pending_plugins_tail = g_list_append (loader->pending_plugins_tail, entry); if (loader->pending_plugins == NULL) loader->pending_plugins = loader->pending_plugins_tail; else loader->pending_plugins_tail = g_list_next (loader->pending_plugins_tail); len = strlen (filename); put_packet (loader, PACKET_LOAD_PLUGIN, entry->tag, (guint8 *) filename, len + 1); if (!exchange_packets (loader)) { if (!plugin_loader_replay_pending (loader)) return FALSE; } return TRUE; } static gboolean plugin_loader_replay_pending (GstPluginLoader * l) { GList *cur, *next; restart: if (!gst_plugin_loader_spawn (l)) return FALSE; /* Load each plugin one by one synchronously until we find the * crashing one */ while ((cur = l->pending_plugins)) { PendingPluginEntry *entry = (PendingPluginEntry *) (cur->data); if (!plugin_loader_load_and_sync (l, entry)) { /* Create dummy plugin entry to block re-scanning this file */ GST_ERROR ("Plugin file %s failed to load. Blacklisting", entry->filename); plugin_loader_create_blacklist_plugin (l, entry); l->got_plugin_details = TRUE; /* Now remove this crashy plugin from the head of the list */ l->pending_plugins = g_list_delete_link (cur, cur); if (l->pending_plugins == NULL) l->pending_plugins_tail = NULL; if (!gst_plugin_loader_spawn (l)) return FALSE; break; } } /* We exited after finding the crashing one. If there's any more pending, * dispatch them post-haste, but don't wait */ for (cur = l->pending_plugins; cur != NULL; cur = next) { PendingPluginEntry *entry = (PendingPluginEntry *) (cur->data); next = g_list_next (cur); put_packet (l, PACKET_LOAD_PLUGIN, entry->tag, (guint8 *) entry->filename, strlen (entry->filename) + 1); /* This might invalidate cur, which is why we grabbed 'next' above */ if (!exchange_packets (l)) goto restart; } return TRUE; } static gboolean plugin_loader_sync_with_child (GstPluginLoader * l) { put_packet (l, PACKET_SYNC, 0, NULL, 0); l->rx_got_sync = FALSE; while (!l->rx_got_sync) { if (!exchange_packets (l)) return FALSE; } return TRUE; } static gboolean plugin_loader_load_and_sync (GstPluginLoader * l, PendingPluginEntry * entry) { gint len; GST_DEBUG_OBJECT (l->registry, "Synchronously loading plugin file %s", entry->filename); len = strlen (entry->filename); put_packet (l, PACKET_LOAD_PLUGIN, entry->tag, (guint8 *) entry->filename, len + 1); return plugin_loader_sync_with_child (l); } static void plugin_loader_create_blacklist_plugin (GstPluginLoader * l, PendingPluginEntry * entry) { GstPlugin *plugin = g_object_newv (GST_TYPE_PLUGIN, 0, NULL); plugin->filename = g_strdup (entry->filename); plugin->file_mtime = entry->file_mtime; plugin->file_size = entry->file_size; plugin->flags |= GST_PLUGIN_FLAG_BLACKLISTED; plugin->basename = g_path_get_basename (plugin->filename); plugin->desc.name = g_intern_string (plugin->basename); plugin->desc.description = g_strdup_printf ("Plugin for blacklisted file"); plugin->desc.version = g_intern_string ("0.0.0"); plugin->desc.license = g_intern_string ("BLACKLIST"); plugin->desc.source = plugin->desc.license; plugin->desc.package = plugin->desc.license; plugin->desc.origin = plugin->desc.license; GST_DEBUG ("Adding blacklist plugin '%s'", plugin->desc.name); gst_registry_add_plugin (l->registry, plugin); } static gboolean gst_plugin_loader_try_helper (GstPluginLoader * loader, gchar * location) { char *argv[] = { location, (char *) "-l", NULL }; GST_LOG ("Trying to spawn gst-plugin-scanner helper at %s", location); if (!g_spawn_async_with_pipes (NULL, argv, NULL, G_SPAWN_DO_NOT_REAP_CHILD /* | G_SPAWN_STDERR_TO_DEV_NULL */ , NULL, NULL, &loader->child_pid, &loader->fd_w.fd, &loader->fd_r.fd, NULL, NULL)) return FALSE; gst_poll_add_fd (loader->fdset, &loader->fd_w); gst_poll_add_fd (loader->fdset, &loader->fd_r); gst_poll_fd_ctl_read (loader->fdset, &loader->fd_r, TRUE); loader->tx_buf_write = loader->tx_buf_read = 0; put_packet (loader, PACKET_VERSION, 0, NULL, 0); if (!plugin_loader_sync_with_child (loader)) return FALSE; loader->child_running = TRUE; return TRUE; } static gboolean gst_plugin_loader_spawn (GstPluginLoader * loader) { const gchar *env; char *helper_bin; gboolean res = FALSE; if (loader->child_running) return TRUE; /* Find the gst-plugin-scanner: first try the env-var if it is set, * otherwise use the installed version */ env = g_getenv ("GST_PLUGIN_SCANNER"); if (env != NULL && *env != '\0') { GST_LOG ("Trying GST_PLUGIN_SCANNER env var: %s", env); helper_bin = g_strdup (env); res = gst_plugin_loader_try_helper (loader, helper_bin); g_free (helper_bin); } if (!res) { GST_LOG ("Trying installed plugin scanner"); helper_bin = g_strdup (GST_PLUGIN_SCANNER_INSTALLED); res = gst_plugin_loader_try_helper (loader, helper_bin); g_free (helper_bin); if (!res) { GST_INFO ("No gst-plugin-scanner available, or not working"); } } return loader->child_running; } static void plugin_loader_cleanup_child (GstPluginLoader * l) { if (!l->child_running || l->is_child) return; gst_poll_remove_fd (l->fdset, &l->fd_w); gst_poll_remove_fd (l->fdset, &l->fd_r); close (l->fd_w.fd); close (l->fd_r.fd); #ifndef G_OS_WIN32 GST_LOG ("waiting for child process to exit"); waitpid (l->child_pid, NULL, 0); #else g_warning ("FIXME: Implement child process shutdown for Win32"); #endif g_spawn_close_pid (l->child_pid); l->child_running = FALSE; } gboolean _gst_plugin_loader_client_run (void) { GstPluginLoader *l; l = plugin_loader_new (NULL); if (l == NULL) return FALSE; /* On entry, the inward pipe is STDIN, and outward is STDOUT. * Dup those somewhere better so that plugins printing things * won't interfere with anything */ #ifndef G_OS_WIN32 { int dup_fd; dup_fd = dup (0); /* STDIN */ if (dup_fd == -1) { GST_ERROR ("Failed to start. Could no dup STDIN, errno %d", errno); return FALSE; } l->fd_r.fd = dup_fd; close (0); dup_fd = dup (1); /* STDOUT */ if (dup_fd == -1) { GST_ERROR ("Failed to start. Could no dup STDOUT, errno %d", errno); return FALSE; } l->fd_w.fd = dup_fd; close (1); /* Dup stderr down to stdout so things that plugins print are visible, * but don't care if it fails */ dup2 (2, 1); } #else /* FIXME: Use DuplicateHandle and friends on win32 */ l->fd_w.fd = 1; /* STDOUT */ l->fd_r.fd = 0; /* STDIN */ #endif gst_poll_add_fd (l->fdset, &l->fd_w); gst_poll_add_fd (l->fdset, &l->fd_r); gst_poll_fd_ctl_read (l->fdset, &l->fd_r, TRUE); l->is_child = TRUE; GST_DEBUG ("Plugin scanner child running. Waiting for instructions"); /* Loop, listening for incoming packets on the fd and writing responses */ while (!l->rx_done && exchange_packets (l)); plugin_loader_free (l); return TRUE; } static void put_packet (GstPluginLoader * l, guint type, guint32 tag, const guint8 * payload, guint32 payload_len) { guint8 *out; guint len = payload_len + HEADER_SIZE; if (l->tx_buf_write + len >= l->tx_buf_size) { GST_LOG ("Expanding tx buf from %d to %d for packet of size %d", l->tx_buf_size, l->tx_buf_write + len + BUF_GROW_EXTRA, len); l->tx_buf_size = l->tx_buf_write + len + BUF_GROW_EXTRA; l->tx_buf = g_realloc (l->tx_buf, l->tx_buf_size); } out = l->tx_buf + l->tx_buf_write; /* one byte packet type */ out[0] = type; /* 3 byte packet tag number */ GST_WRITE_UINT24_BE (out + 1, tag); /* 4 bytes packet length */ GST_WRITE_UINT32_BE (out + 4, payload_len); /* payload */ memcpy (out + HEADER_SIZE, payload, payload_len); /* Write magic into the header */ GST_WRITE_UINT32_BE (out + 8, HEADER_MAGIC); l->tx_buf_write += len; gst_poll_fd_ctl_write (l->fdset, &l->fd_w, TRUE); } static void put_chunk (GstPluginLoader * l, GstRegistryChunk * chunk, guint * pos) { guint padsize = 0; guint len; guint8 *out; /* Might need to align the chunk */ if (chunk->align && ((*pos) % ALIGNMENT) != 0) padsize = ALIGNMENT - ((*pos) % ALIGNMENT); len = padsize + chunk->size; if (G_UNLIKELY (l->tx_buf_write + len >= l->tx_buf_size)) { guint new_size = MAX (l->tx_buf_write + len, l->tx_buf_size + l->tx_buf_size / 4) + BUF_GROW_EXTRA; GST_LOG ("Expanding tx buf from %d to %d for chunk of size %d", l->tx_buf_size, new_size, chunk->size); l->tx_buf_size = new_size; l->tx_buf = g_realloc (l->tx_buf, l->tx_buf_size); } out = l->tx_buf + l->tx_buf_write; /* Clear the padding */ if (padsize) memset (out, 0, padsize); memcpy (out + padsize, chunk->data, chunk->size); l->tx_buf_write += len; *pos += len; gst_poll_fd_ctl_write (l->fdset, &l->fd_w, TRUE); }; static gboolean write_one (GstPluginLoader * l) { guint8 *out; guint32 to_write, magic; int res; if (l->tx_buf_read + HEADER_SIZE > l->tx_buf_write) return FALSE; out = l->tx_buf + l->tx_buf_read; magic = GST_READ_UINT32_BE (out + 8); if (magic != HEADER_MAGIC) { GST_ERROR ("Packet magic number is missing. Memory corruption detected"); goto fail_and_cleanup; } to_write = GST_READ_UINT32_BE (out + 4) + HEADER_SIZE; /* Check that the magic is intact, and the size is sensible */ if (to_write > l->tx_buf_size) { GST_ERROR ("Indicated packet size is too large. Corruption detected"); goto fail_and_cleanup; } l->tx_buf_read += to_write; GST_LOG ("Writing packet of size %d bytes to fd %d", to_write, l->fd_w.fd); do { res = write (l->fd_w.fd, out, to_write); if (G_UNLIKELY (res < 0)) { if (errno == EAGAIN || errno == EINTR) continue; /* Failed to write -> child died */ goto fail_and_cleanup; } to_write -= res; out += res; } while (to_write > 0); if (l->tx_buf_read == l->tx_buf_write) { gst_poll_fd_ctl_write (l->fdset, &l->fd_w, FALSE); l->tx_buf_read = l->tx_buf_write = 0; } return TRUE; fail_and_cleanup: plugin_loader_cleanup_child (l); return FALSE; } static gboolean do_plugin_load (GstPluginLoader * l, const gchar * filename, guint tag) { GstPlugin *newplugin; GList *chunks = NULL; GST_DEBUG ("Plugin scanner loading file %s. tag %u\n", filename, tag); #if 0 /* Test code - crash based on filename */ if (strstr (filename, "coreelements") == NULL) { g_printerr ("Crashing on file %s\n", filename); g_printerr ("%d", *(gint *) (NULL)); } #endif newplugin = gst_plugin_load_file ((gchar *) filename, NULL); if (newplugin) { guint hdr_pos; guint offset; /* Now serialise the plugin details and send */ if (!_priv_gst_registry_chunks_save_plugin (&chunks, gst_registry_get_default (), newplugin)) goto fail; /* Store where the header is, write an empty one, then write * all the payload chunks, then fix up the header size */ hdr_pos = l->tx_buf_write; offset = HEADER_SIZE; put_packet (l, PACKET_PLUGIN_DETAILS, tag, NULL, 0); if (chunks) { GList *walk; for (walk = chunks; walk; walk = g_list_next (walk)) { GstRegistryChunk *cur = walk->data; put_chunk (l, cur, &offset); if (!(cur->flags & GST_REGISTRY_CHUNK_FLAG_CONST)) g_free (cur->data); g_free (cur); } g_list_free (chunks); /* Store the size of the written payload */ GST_WRITE_UINT32_BE (l->tx_buf + hdr_pos + 4, offset - HEADER_SIZE); } #if 0 /* Test code - corrupt the tx buffer based on filename */ if (strstr (filename, "sink") != NULL) { int fd, res; g_printerr ("Corrupting tx buf on file %s\n", filename); fd = open ("/dev/urandom", O_RDONLY); res = read (fd, l->tx_buf, l->tx_buf_size); close (fd); } #endif gst_object_unref (newplugin); } else { put_packet (l, PACKET_PLUGIN_DETAILS, tag, NULL, 0); } return TRUE; fail: put_packet (l, PACKET_PLUGIN_DETAILS, tag, NULL, 0); if (chunks) { GList *walk; for (walk = chunks; walk; walk = g_list_next (walk)) { GstRegistryChunk *cur = walk->data; if (!(cur->flags & GST_REGISTRY_CHUNK_FLAG_CONST)) g_free (cur->data); g_free (cur); } g_list_free (chunks); } return FALSE; } static gboolean check_protocol_version (GstPluginLoader * l, guint8 * payload, guint payload_len) { guint32 got_version; guint8 *binary_reg_ver; if (payload_len < sizeof (guint32) + GST_MAGIC_BINARY_VERSION_LEN) return FALSE; got_version = GST_READ_UINT32_BE (payload); GST_LOG ("Got VERSION %u from child. Ours is %u", got_version, loader_protocol_version); if (got_version != loader_protocol_version) return FALSE; binary_reg_ver = payload + sizeof (guint32); if (strcmp ((gchar *) binary_reg_ver, GST_MAGIC_BINARY_VERSION_STR)) { GST_LOG ("Binary chunk format of child is different. Ours: %s, child %s\n", GST_MAGIC_BINARY_VERSION_STR, binary_reg_ver); return FALSE; } return TRUE; }; static gboolean handle_rx_packet (GstPluginLoader * l, guint pack_type, guint32 tag, guint8 * payload, guint payload_len) { gboolean res = TRUE; switch (pack_type) { case PACKET_EXIT: gst_poll_fd_ctl_read (l->fdset, &l->fd_r, FALSE); if (l->is_child) { /* Respond, then we keep looping until the parent closes the fd */ put_packet (l, PACKET_EXIT, 0, NULL, 0); } else { l->rx_done = TRUE; /* All done reading from child */ } return TRUE; case PACKET_LOAD_PLUGIN:{ if (!l->is_child) return TRUE; /* Payload is the filename to load */ res = do_plugin_load (l, (gchar *) payload, tag); break; } case PACKET_PLUGIN_DETAILS:{ gchar *tmp = (gchar *) payload; PendingPluginEntry *entry = NULL; GList *cur; GST_DEBUG_OBJECT (l->registry, "Received plugin details from child w/ tag %u. %d bytes info", tag, payload_len); /* Assume that tagged details come back in the order * we requested, and delete anything before (but not * including) this one */ cur = l->pending_plugins; while (cur) { PendingPluginEntry *e = (PendingPluginEntry *) (cur->data); if (e->tag > tag) break; if (e->tag == tag) { entry = e; break; } else { cur = g_list_delete_link (cur, cur); g_free (e->filename); g_free (e); } } l->pending_plugins = cur; if (cur == NULL) l->pending_plugins_tail = NULL; if (payload_len > 0) { GstPlugin *newplugin = NULL; if (!_priv_gst_registry_chunks_load_plugin (l->registry, &tmp, tmp + payload_len, &newplugin)) { /* Got garbage from the child, so fail and trigger replay of plugins */ GST_ERROR_OBJECT (l->registry, "Problems loading plugin details with tag %u from scanner", tag); return FALSE; } newplugin->flags &= ~GST_PLUGIN_FLAG_CACHED; GST_LOG_OBJECT (l->registry, "marking plugin %p as registered as %s", newplugin, newplugin->filename); newplugin->registered = TRUE; /* We got a set of plugin details - remember it for later */ l->got_plugin_details = TRUE; } else if (entry != NULL) { /* Create a blacklist entry for this file to prevent scanning every time */ plugin_loader_create_blacklist_plugin (l, entry); l->got_plugin_details = TRUE; } if (entry != NULL) { g_free (entry->filename); g_free (entry); } /* Remove the plugin entry we just loaded */ cur = l->pending_plugins; if (cur != NULL) cur = g_list_delete_link (cur, cur); l->pending_plugins = cur; if (cur == NULL) l->pending_plugins_tail = NULL; break; } case PACKET_SYNC: if (l->is_child) { /* Respond with our reply - also a sync */ put_packet (l, PACKET_SYNC, tag, NULL, 0); GST_LOG ("Got SYNC in child - replying"); } else l->rx_got_sync = TRUE; break; case PACKET_VERSION: if (l->is_child) { /* Respond with our reply - a version packet, with the version */ const gint version_len = sizeof (guint32) + GST_MAGIC_BINARY_VERSION_LEN; guint8 version_info[sizeof (guint32) + GST_MAGIC_BINARY_VERSION_LEN]; memset (version_info, 0, version_len); GST_WRITE_UINT32_BE (version_info, loader_protocol_version); memcpy (version_info + sizeof (guint32), GST_MAGIC_BINARY_VERSION_STR, strlen (GST_MAGIC_BINARY_VERSION_STR)); put_packet (l, PACKET_VERSION, tag, version_info, version_len); GST_LOG ("Got VERSION in child - replying %u", loader_protocol_version); } else { res = check_protocol_version (l, payload, payload_len); } break; default: return FALSE; /* Invalid packet -> something is wrong */ } return res; } static gboolean read_one (GstPluginLoader * l) { guint64 magic; guint32 to_read, packet_len, tag; guint8 *in; gint res; to_read = HEADER_SIZE; in = l->rx_buf; do { res = read (l->fd_r.fd, in, to_read); if (G_UNLIKELY (res < 0)) { if (errno == EAGAIN || errno == EINTR) continue; GST_LOG ("Failed reading packet header"); return FALSE; } to_read -= res; in += res; } while (to_read > 0); magic = GST_READ_UINT32_BE (l->rx_buf + 8); if (magic != HEADER_MAGIC) { GST_WARNING ("Invalid packet (bad magic number) received from plugin scanner subprocess"); return FALSE; } packet_len = GST_READ_UINT32_BE (l->rx_buf + 4); if (packet_len + HEADER_SIZE > BUF_MAX_SIZE) { GST_WARNING ("Received excessively large packet for plugin scanner subprocess"); return FALSE; } tag = GST_READ_UINT24_BE (l->rx_buf + 1); if (packet_len > 0) { if (packet_len + HEADER_SIZE >= l->rx_buf_size) { GST_LOG ("Expanding rx buf from %d to %d", l->rx_buf_size, packet_len + HEADER_SIZE + BUF_GROW_EXTRA); l->rx_buf_size = packet_len + HEADER_SIZE + BUF_GROW_EXTRA; l->rx_buf = g_realloc (l->rx_buf, l->rx_buf_size); } in = l->rx_buf + HEADER_SIZE; to_read = packet_len; do { res = read (l->fd_r.fd, in, to_read); if (G_UNLIKELY (res < 0)) { if (errno == EAGAIN || errno == EINTR) continue; GST_ERROR ("Packet payload read failed"); return FALSE; } to_read -= res; in += res; } while (to_read > 0); } else { GST_LOG ("No payload to read for 0 length packet type %d tag %u", l->rx_buf[0], tag); } return handle_rx_packet (l, l->rx_buf[0], tag, l->rx_buf + HEADER_SIZE, packet_len); } static gboolean exchange_packets (GstPluginLoader * l) { gint res; /* Wait for activity on our FDs */ do { do { res = gst_poll_wait (l->fdset, GST_SECOND); } while (res == -1 && (errno == EINTR || errno == EAGAIN)); if (res < 0) return FALSE; GST_LOG ("Poll res = %d. %d bytes pending for write", res, l->tx_buf_write - l->tx_buf_read); if (!l->rx_done) { if (gst_poll_fd_has_error (l->fdset, &l->fd_r) || gst_poll_fd_has_closed (l->fdset, &l->fd_r)) { GST_LOG ("read fd %d closed/errored", l->fd_r.fd); goto fail_and_cleanup; } if (gst_poll_fd_can_read (l->fdset, &l->fd_r)) { if (!read_one (l)) goto fail_and_cleanup; } } if (l->tx_buf_read < l->tx_buf_write) { if (gst_poll_fd_has_error (l->fdset, &l->fd_w) || gst_poll_fd_has_closed (l->fdset, &l->fd_r)) { GST_ERROR ("write fd %d closed/errored", l->fd_w.fd); goto fail_and_cleanup; } if (gst_poll_fd_can_write (l->fdset, &l->fd_w)) { if (!write_one (l)) goto fail_and_cleanup; } } } while (l->tx_buf_read < l->tx_buf_write); return TRUE; fail_and_cleanup: plugin_loader_cleanup_child (l); return FALSE; }