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-rw-r--r--src/mds-registry/globals.h3
-rw-r--r--src/mds-registry/mds-registry.c151
-rw-r--r--src/mds-registry/reexec.c180
-rw-r--r--src/mds-registry/reexec.h26
4 files changed, 210 insertions, 150 deletions
diff --git a/src/mds-registry/globals.h b/src/mds-registry/globals.h
index 8c0799a..9c4b42f 100644
--- a/src/mds-registry/globals.h
+++ b/src/mds-registry/globals.h
@@ -27,6 +27,9 @@
#include <pthread.h>
+#define MDS_REGISTRY_VARS_VERSION 0
+
+
/**
* Value of the ‘Message ID’ header for the next message
diff --git a/src/mds-registry/mds-registry.c b/src/mds-registry/mds-registry.c
index b41733a..fa6a3b5 100644
--- a/src/mds-registry/mds-registry.c
+++ b/src/mds-registry/mds-registry.c
@@ -19,6 +19,7 @@
#include "util.h"
#include "globals.h"
+#include "reexec.h"
#include <libmdsserver/macros.h>
#include <libmdsserver/util.h>
@@ -36,8 +37,6 @@
-#define MDS_REGISTRY_VARS_VERSION 0
-
/**
@@ -148,154 +147,6 @@ int postinitialise_server(void)
/**
- * Calculate the number of bytes that will be stored by `marshal_server`
- *
- * On failure the program should `abort()` or exit by other means.
- * However it should not be possible for this function to fail.
- *
- * @return The number of bytes that will be stored by `marshal_server`
- */
-size_t marshal_server_size(void)
-{
- size_t i, rc = 2 * sizeof(int) + sizeof(int32_t) + 3 * sizeof(size_t);
- hash_entry_t* entry;
-
- rc += mds_message_marshal_size(&received);
-
- foreach_hash_table_entry (reg_table, i, entry)
- {
- char* command = (char*)(void*)(entry->key);
- size_t len = strlen(command) + 1;
- client_list_t* list = (client_list_t*)(void*)(entry->value);
-
- rc += len + sizeof(size_t) + client_list_marshal_size(list);
- }
-
- return rc;
-}
-
-
-/**
- * Marshal server implementation specific data into a buffer
- *
- * @param state_buf The buffer for the marshalled data
- * @return Non-zero on error
- */
-int marshal_server(char* state_buf)
-{
- size_t i, n = mds_message_marshal_size(&received);
- hash_entry_t* entry;
-
- buf_set_next(state_buf, int, MDS_REGISTRY_VARS_VERSION);
- buf_set_next(state_buf, int, connected);
- buf_set_next(state_buf, int32_t, message_id);
- buf_set_next(state_buf, size_t, n);
- mds_message_marshal(&received, state_buf);
- state_buf += n / sizeof(char);
-
- buf_set_next(state_buf, size_t, reg_table.capacity);
- buf_set_next(state_buf, size_t, reg_table.size);
- foreach_hash_table_entry (reg_table, i, entry)
- {
- char* command = (char*)(void*)(entry->key);
- size_t len = strlen(command) + 1;
- client_list_t* list = (client_list_t*)(void*)(entry->value);
-
- memcpy(state_buf, command, len * sizeof(char));
- state_buf += len;
-
- n = client_list_marshal_size(list);
- buf_set_next(state_buf, size_t, n);
- client_list_marshal(list, state_buf);
- state_buf += n / sizeof(char);
- }
-
- hash_table_destroy(&reg_table, (free_func*)reg_table_free_key, (free_func*)reg_table_free_value);
- mds_message_destroy(&received);
- return 0;
-}
-
-
-/**
- * Unmarshal server implementation specific data and update the servers state accordingly
- *
- * On critical failure the program should `abort()` or exit by other means.
- * That is, do not let `reexec_failure_recover` run successfully, if it unrecoverable
- * error has occurred or one severe enough that it is better to simply respawn.
- *
- * @param state_buf The marshalled data that as not been read already
- * @return Non-zero on error
- */
-int unmarshal_server(char* state_buf)
-{
- char* command;
- client_list_t* list;
- size_t i, n, m;
- int stage = 0;
-
- /* buf_get_next(state_buf, int, MDS_REGISTRY_VARS_VERSION); */
- buf_next(state_buf, int, 1);
- buf_get_next(state_buf, int, connected);
- buf_get_next(state_buf, int32_t, message_id);
- buf_get_next(state_buf, size_t, n);
- fail_if (mds_message_unmarshal(&received, state_buf));
- state_buf += n / sizeof(char);
- stage = 1;
-
- buf_get_next(state_buf, size_t, n);
- fail_if (hash_table_create_tuned(&reg_table, n));
- buf_get_next(state_buf, size_t, n);
- for (i = 0; i < n; i++)
- {
- stage = 1;
- fail_if ((command = strdup(state_buf)) == NULL);
- state_buf += strlen(command) + 1;
-
- stage = 2;
- fail_if ((list = malloc(sizeof(client_list_t))) == NULL);
- buf_get_next(state_buf, size_t, m);
- stage = 3;
- fail_if (client_list_unmarshal(list, state_buf));
- state_buf += m / sizeof(char);
-
- hash_table_put(&reg_table, (size_t)(void*)command, (size_t)(void*)list);
- fail_if (errno);
- }
-
- reg_table.key_comparator = (compare_func*)string_comparator;
- reg_table.hasher = (hash_func*)string_hash;
-
- return 0;
- pfail:
- perror(*argv);
- mds_message_destroy(&received);
- if (stage >= 1)
- hash_table_destroy(&reg_table, (free_func*)reg_table_free_key, (free_func*)reg_table_free_value);
- if (stage >= 2)
- free(command);
- if (stage >= 3)
- {
- client_list_destroy(list);
- free(list);
- }
- abort();
- return -1;
-}
-
-
-/**
- * Attempt to recover from a re-exec failure that has been
- * detected after the server successfully updated it execution image
- *
- * @return Non-zero on error
- */
-int __attribute__((const)) reexec_failure_recover(void)
-{
- return -1;
-}
-
-
-/**
* Perform the server's mission
*
* @return Non-zero on error
diff --git a/src/mds-registry/reexec.c b/src/mds-registry/reexec.c
new file mode 100644
index 0000000..dafbff1
--- /dev/null
+++ b/src/mds-registry/reexec.c
@@ -0,0 +1,180 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "reexec.h"
+
+#include "util.h"
+#include "globals.h"
+
+#include <libmdsserver/macros.h>
+#include <libmdsserver/hash-help.h>
+#include <libmdsserver/client-list.h>
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+
+
+/**
+ * Calculate the number of bytes that will be stored by `marshal_server`
+ *
+ * On failure the program should `abort()` or exit by other means.
+ * However it should not be possible for this function to fail.
+ *
+ * @return The number of bytes that will be stored by `marshal_server`
+ */
+size_t marshal_server_size(void)
+{
+ size_t i, rc = 2 * sizeof(int) + sizeof(int32_t) + 3 * sizeof(size_t);
+ hash_entry_t* entry;
+
+ rc += mds_message_marshal_size(&received);
+
+ foreach_hash_table_entry (reg_table, i, entry)
+ {
+ char* command = (char*)(void*)(entry->key);
+ size_t len = strlen(command) + 1;
+ client_list_t* list = (client_list_t*)(void*)(entry->value);
+
+ rc += len + sizeof(size_t) + client_list_marshal_size(list);
+ }
+
+ return rc;
+}
+
+
+/**
+ * Marshal server implementation specific data into a buffer
+ *
+ * @param state_buf The buffer for the marshalled data
+ * @return Non-zero on error
+ */
+int marshal_server(char* state_buf)
+{
+ size_t i, n = mds_message_marshal_size(&received);
+ hash_entry_t* entry;
+
+ buf_set_next(state_buf, int, MDS_REGISTRY_VARS_VERSION);
+ buf_set_next(state_buf, int, connected);
+ buf_set_next(state_buf, int32_t, message_id);
+ buf_set_next(state_buf, size_t, n);
+ mds_message_marshal(&received, state_buf);
+ state_buf += n / sizeof(char);
+
+ buf_set_next(state_buf, size_t, reg_table.capacity);
+ buf_set_next(state_buf, size_t, reg_table.size);
+ foreach_hash_table_entry (reg_table, i, entry)
+ {
+ char* command = (char*)(void*)(entry->key);
+ size_t len = strlen(command) + 1;
+ client_list_t* list = (client_list_t*)(void*)(entry->value);
+
+ memcpy(state_buf, command, len * sizeof(char));
+ state_buf += len;
+
+ n = client_list_marshal_size(list);
+ buf_set_next(state_buf, size_t, n);
+ client_list_marshal(list, state_buf);
+ state_buf += n / sizeof(char);
+ }
+
+ hash_table_destroy(&reg_table, (free_func*)reg_table_free_key, (free_func*)reg_table_free_value);
+ mds_message_destroy(&received);
+ return 0;
+}
+
+
+/**
+ * Unmarshal server implementation specific data and update the servers state accordingly
+ *
+ * On critical failure the program should `abort()` or exit by other means.
+ * That is, do not let `reexec_failure_recover` run successfully, if it unrecoverable
+ * error has occurred or one severe enough that it is better to simply respawn.
+ *
+ * @param state_buf The marshalled data that as not been read already
+ * @return Non-zero on error
+ */
+int unmarshal_server(char* state_buf)
+{
+ char* command;
+ client_list_t* list;
+ size_t i, n, m;
+ int stage = 0;
+
+ /* buf_get_next(state_buf, int, MDS_REGISTRY_VARS_VERSION); */
+ buf_next(state_buf, int, 1);
+ buf_get_next(state_buf, int, connected);
+ buf_get_next(state_buf, int32_t, message_id);
+ buf_get_next(state_buf, size_t, n);
+ fail_if (mds_message_unmarshal(&received, state_buf));
+ state_buf += n / sizeof(char);
+ stage = 1;
+
+ buf_get_next(state_buf, size_t, n);
+ fail_if (hash_table_create_tuned(&reg_table, n));
+ buf_get_next(state_buf, size_t, n);
+ for (i = 0; i < n; i++)
+ {
+ stage = 1;
+ fail_if ((command = strdup(state_buf)) == NULL);
+ state_buf += strlen(command) + 1;
+
+ stage = 2;
+ fail_if ((list = malloc(sizeof(client_list_t))) == NULL);
+ buf_get_next(state_buf, size_t, m);
+ stage = 3;
+ fail_if (client_list_unmarshal(list, state_buf));
+ state_buf += m / sizeof(char);
+
+ hash_table_put(&reg_table, (size_t)(void*)command, (size_t)(void*)list);
+ fail_if (errno);
+ }
+
+ reg_table.key_comparator = (compare_func*)string_comparator;
+ reg_table.hasher = (hash_func*)string_hash;
+
+ return 0;
+ pfail:
+ perror(*argv);
+ mds_message_destroy(&received);
+ if (stage >= 1)
+ hash_table_destroy(&reg_table, (free_func*)reg_table_free_key, (free_func*)reg_table_free_value);
+ if (stage >= 2)
+ free(command);
+ if (stage >= 3)
+ {
+ client_list_destroy(list);
+ free(list);
+ }
+ abort();
+ return -1;
+}
+
+
+/**
+ * Attempt to recover from a re-exec failure that has been
+ * detected after the server successfully updated it execution image
+ *
+ * @return Non-zero on error
+ */
+int __attribute__((const)) reexec_failure_recover(void)
+{
+ return -1;
+}
+
diff --git a/src/mds-registry/reexec.h b/src/mds-registry/reexec.h
new file mode 100644
index 0000000..f09b7eb
--- /dev/null
+++ b/src/mds-registry/reexec.h
@@ -0,0 +1,26 @@
+/**
+ * mds — A micro-display server
+ * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef MDS_MDS_REGISTRY_REEXEC_H
+#define MDS_MDS_REGISTRY_REEXEC_H
+
+
+#include "../mds-base.h"
+
+
+#endif
+
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