A very first shot at implementing the status API for the prefork mpm. (3329cb4d) · Commits · CYBER - Cyber Security / TS 103 523 MSP / TLMSP / TLMSP Apache Httpd

server/mpm/prefork/prefork.c

+135 −10

Changes for server/mpm/prefork/prefork.c: 135 added lines, 10 removed lines.
Original line number	Diff line number	Diff line
		@@ -81,7 +81,6 @@
		/* TODO: this is a cobbled together prefork MPM example... it should mostly
		* TODO: behave like apache-1.3... here's a short list of things I think
		* TODO: need cleaning up still:
		* TODO: - use ralf's mm stuff for the shared mem and mutexes
		* TODO: - clean up scoreboard stuff when we figure out how to do it in 2.0
		*/

		@@ -127,6 +126,7 @@ static int ap_daemons_max_free=0;
		static int ap_daemons_limit=0;
		static time_t ap_restart_time=0;
		static int ap_extended_status = 0;
		static int maintain_connection_status = 1;

		/*
		* The max child slot ever assigned, preserved across restarts. Necessary
		@@ -184,6 +184,7 @@ char tpf_server_name[INETD_SERVNAME_LENGTH+1];
		#endif /* TPF */

		static scoreboard *ap_scoreboard_image = NULL;
		static new_scoreboard *ap_new_scoreboard_image = NULL;

		#ifdef GPROF
		/*
		@@ -922,13 +923,14 @@ static void setup_shared_mem(ap_context_t *p)
		const char *fname;

		fname = ap_server_root_relative(p, ap_scoreboard_fname);
		if (ap_shm_init(&scoreboard_shm, SCOREBOARD_SIZE + 40, fname, p) != APR_SUCCESS) {
		if (ap_shm_init(&scoreboard_shm, SCOREBOARD_SIZE + NEW_SCOREBOARD_SIZE + 40, fname, p) != APR_SUCCESS) {
		ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
		ap_server_argv0);
		perror(buf);
		exit(APEXIT_INIT);
		}
		ap_scoreboard_image = ap_shm_malloc(scoreboard_shm, SCOREBOARD_SIZE);
		ap_new_scoreboard_image = ap_shm_malloc(scoreboard_shm, NEW_SCOREBOARD_SIZE);
		if (ap_scoreboard_image == NULL) {
		ap_snprintf(buf, sizeof(buf), "%s: cannot allocate scoreboard",
		ap_server_argv0);
		@@ -2156,6 +2158,22 @@ static int setup_listeners(server_rec *s)
		return 0;
		}

		/* Useful to erase the status of children that might be from previous
		* generations */
		static void ap_prefork_force_reset_connection_status(long conn_id)
		{
		int i;

		for (i = 0; i < STATUSES_PER_CONNECTION; i++) {
		ap_new_scoreboard_image->table[conn_id][i].key[0] = '\0';
		} }

		void ap_reset_connection_status(long conn_id)
		{
		if (maintain_connection_status) {
		ap_prefork_force_reset_connection_status(conn_id);
		}
		}

		/*****************************************************************
		* Executive routines.
		@@ -2236,6 +2254,7 @@ int ap_mpm_run(ap_context_t _pconf, ap_context_t plog, server_rec *s)
		ap_sync_scoreboard_image();
		child_slot = find_child_by_pid(pid);
		if (child_slot >= 0) {
		ap_prefork_force_reset_connection_status(child_slot);
		(void) ap_update_child_status(child_slot, SERVER_DEAD,
		(request_rec *) NULL);
		if (remaining_children_to_start
		@@ -2551,22 +2570,128 @@ static const char set_coredumpdir (cmd_parms cmd, void dummy, char arg)
		}

		/* Stub functions until this MPM supports the connection status API */
		/* Don't mess with the string you get back from this function */
		const char ap_get_connection_status(long conn_id, const char key)
		{
		int i = 0;
		status_table_entry *ss;

		API_EXPORT(void) ap_update_connection_status(long conn_id, const char *key, \
		const char *value)
		if (!maintain_connection_status) return "";
		while (i < STATUSES_PER_CONNECTION) {
		ss = &(ap_new_scoreboard_image->table[conn_id][i]);
		if (ss->key[0] == '\0') {
		break;
		}
		if (0 == strcmp(ss->key, key)) {
		return ss->value;
		}
		}

		return NULL;
		}

		ap_array_header_t ap_get_connections(ap_context_t p)
		{
		/* NOP */
		int i;
		ap_array_header_t *connection_list;
		long *array_slot;

		connection_list = ap_make_array(p, 0, sizeof(long));
		/* We assume that there is a connection iff it has an entry in the status
		* table. Connections without any status sound problematic to me, so this
		* is probably for the best. - manoj */
		for (i = 0; i < max_daemons_limit; i++) {
		if (ap_new_scoreboard_image->table[i][0].key[0] != '\0') {
		array_slot = ap_push_array(connection_list);
		*array_slot = i;
		}
		}
		return connection_list;
		}

		ap_array_header_t ap_get_status_table(ap_context_t p)
		ap_array_header_t ap_get_connection_keys(ap_context_t p, long conn_id)
		{
		/* NOP */
		return NULL;
		int i = 0;
		status_table_entry *ss;
		ap_array_header_t *key_list;
		char **array_slot;

		key_list = ap_make_array(p, 0, KEY_LENGTH * sizeof(char));
		while (i < STATUSES_PER_CONNECTION) {
		ss = &(ap_new_scoreboard_image->table[conn_id][i]);
		if (ss->key[0] == '\0') {
		break;
		}
		array_slot = ap_push_array(key_list);
		*array_slot = ap_pstrdup(p, ss->key);
		i++;
		}
		return key_list;
		}

		API_EXPORT(void) ap_reset_connection_status(long conn_id)
		/* Note: no effort is made here to prevent multiple threads from messing with
		* a single connection at the same time. ap_update_connection_status should
		* only be called by the thread that owns the connection */

		void ap_update_connection_status(long conn_id, const char *key,
		const char *value)
		{
		int i = 0;
		status_table_entry *ss;

		if (!maintain_connection_status) return;
		while (i < STATUSES_PER_CONNECTION) {
		ss = &(ap_new_scoreboard_image->table[conn_id][i]);
		if (ss->key[0] == '\0') {
		break;
		}
		if (0 == strcmp(ss->key, key)) {
		ap_cpystrn(ss->value, value, VALUE_LENGTH);
		return;
		}
		i++;
		}
		/* Not found. Add an entry for this value */
		if (i >= STATUSES_PER_CONNECTION) {
		/* No room. Oh well, not much anyone can do about it. */
		return;
		}
		ap_cpystrn(ss->key, key, KEY_LENGTH);
		ap_cpystrn(ss->value, value, VALUE_LENGTH);
		return;
		}

		ap_array_header_t ap_get_status_table(ap_context_t p)
		{
		/* NOP */
		int i, j;
		ap_array_header_t *server_status;
		ap_status_table_row_t *array_slot;
		status_table_entry *ss;

		server_status = ap_make_array(p, 0, sizeof(ap_status_table_row_t));

		/* Go ahead and return what's in the connection status table even if we
		* aren't maintaining it. We can at least look at what children from
		* previous generations are up to. */

		for (i = 0; i < max_daemons_limit; i++) {
		if (ap_new_scoreboard_image->table[i][0].key[0] == '\0')
		continue;
		array_slot = ap_push_array(server_status);
		array_slot->data = ap_make_table(p, 0);
		array_slot->conn_id = i;

		for (j = 0; j < STATUSES_PER_CONNECTION; j++) {
		ss = &(ap_new_scoreboard_image->table[i][j]);
		if (ss->key[0] != '\0') {
		ap_table_add(array_slot->data, ss->key, ss->value);
		}
		else {
		break;
		}
		}
		}
		return server_status;
		}

		static const command_rec prefork_cmds[] = {

server/mpm/prefork/scoreboard.h

+14 −0

Changes for server/mpm/prefork/scoreboard.h: 14 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		@@ -190,7 +190,21 @@ typedef struct {
		global_score global;
		} scoreboard;

		#define KEY_LENGTH 16
		#define VALUE_LENGTH 64
		typedef struct {
		char key[KEY_LENGTH];
		char value[VALUE_LENGTH]; } status_table_entry;

		#define STATUSES_PER_CONNECTION 10

		typedef struct {
		status_table_entry
		table[HARD_SERVER_LIMIT][STATUSES_PER_CONNECTION];
		} new_scoreboard;

		#define SCOREBOARD_SIZE sizeof(scoreboard)
		#define NEW_SCOREBOARD_SIZE sizeof(new_scoreboard)
		#ifdef TPF
		#define SCOREBOARD_NAME "SCOREBRD"
		#define SCOREBOARD_FRAMES SCOREBOARD_SIZE/4095 + 1