From: Andre Noll <maan@tuebingen.mpg.de>
Date: Mon, 7 Aug 2017 18:33:55 +0000 (+0200)
Subject: server: Move afs_pid out of mmd struct.
X-Git-Tag: v0.6.2~52
X-Git-Url: http://git.tue.mpg.de/?a=commitdiff_plain;h=e32a0e7295c6386b421956553ae577a7df1abf8e;p=paraslash.git

server: Move afs_pid out of mmd struct.

The afs_pid variable is read-only after it has been initialized. Hence
it does not qualify for being part of the shared memory area which
contains the mmd struct. Make it a global variable instead.
---

diff --git a/command.c b/command.c
index 9d572317..43f462fd 100644
--- a/command.c
+++ b/command.c
@@ -394,7 +394,7 @@ static int com_si(struct command_context *cc,
 		"supported audio formats: %s\n",
 		ut, mmd->num_played,
 		(int)getppid(),
-		(int)mmd->afs_pid,
+		(int)afs_pid,
 		mmd->active_connections,
 		mmd->num_commands,
 		mmd->num_connects,
diff --git a/server.c b/server.c
index c9605d2f..2018b8ee 100644
--- a/server.c
+++ b/server.c
@@ -95,6 +95,9 @@ int mmd_mutex;
 static struct sched sched;
 static struct signal_task *signal_task;
 
+/** The process id of the audio file selector process. */
+pid_t afs_pid = 0;
+
 /** The task responsible for server command handling. */
 struct server_command_task {
 	/** TCP port on which para_server listens for connections. */
@@ -179,7 +182,7 @@ void parse_config_or_die(bool reload)
 		cf = para_strdup(OPT_STRING_VAL(CONFIG_FILE));
 	else
 		cf = make_message("%s/.paraslash/server.conf", home);
-	if (!mmd || getpid() != mmd->afs_pid) {
+	if (!mmd || getpid() != afs_pid) {
 		if (OPT_GIVEN(USER_LIST))
 			user_list_file = para_strdup(OPT_STRING_VAL(USER_LIST));
 		else
@@ -258,8 +261,8 @@ static void handle_sighup(void)
 
 	PARA_NOTICE_LOG("SIGHUP\n");
 	parse_config_or_die(true);
-	if (mmd->afs_pid)
-		kill(mmd->afs_pid, SIGHUP);
+	if (afs_pid != 0)
+		kill(afs_pid, SIGHUP);
 }
 
 static int signal_post_select(struct sched *s, __a_unused void *context)
@@ -278,7 +281,7 @@ static int signal_post_select(struct sched *s, __a_unused void *context)
 			int ret = para_reap_child(&pid);
 			if (ret <= 0)
 				break;
-			if (pid != mmd->afs_pid)
+			if (pid != afs_pid)
 				continue;
 			PARA_EMERG_LOG("fatal: afs died\n");
 			kill(0, SIGTERM);
@@ -304,8 +307,8 @@ static int signal_post_select(struct sched *s, __a_unused void *context)
 		 * processes get killed immediately by the above kill().
 		 */
 		PARA_INFO_LOG("waiting for afs (pid %d) to die\n",
-			(int)mmd->afs_pid);
-		waitpid(mmd->afs_pid, NULL, 0);
+			(int)afs_pid);
+		waitpid(afs_pid, NULL, 0);
 cleanup:
 		free(mmd->afd.afhi.chunk_table);
 		close_listed_fds();
@@ -432,7 +435,6 @@ err:
 static int init_afs(int argc, char **argv)
 {
 	int ret, afs_server_socket[2];
-	pid_t afs_pid;
 	char c;
 
 	ret = socketpair(PF_UNIX, SOCK_STREAM, 0, afs_server_socket);
@@ -446,6 +448,7 @@ static int init_afs(int argc, char **argv)
 	if (afs_pid == 0) { /* child (afs) */
 		int i;
 
+		afs_pid = getpid();
 		for (i = argc - 1; i >= 0; i--)
 			memset(argv[i], 0, strlen(argv[i]));
 		i = argc - lls_num_inputs(cmdline_lpr) - 1;
@@ -453,7 +456,6 @@ static int init_afs(int argc, char **argv)
 		close(afs_server_socket[0]);
 		afs_init(afs_socket_cookie, afs_server_socket[1]);
 	}
-	mmd->afs_pid = afs_pid;
 	close(afs_server_socket[1]);
 	if (read(afs_server_socket[0], &c, 1) <= 0) {
 		PARA_EMERG_LOG("early afs exit\n");
diff --git a/server.h b/server.h
index 23feadd1..1852dd50 100644
--- a/server.h
+++ b/server.h
@@ -73,8 +73,6 @@ struct misc_meta_data {
 	unsigned int num_connects;
 	/** The number of connections currently active. */
 	unsigned int active_connections;
-	/** The process id of the audio file selector. */
-	pid_t afs_pid;
 	/** This gets updated by afs and contains its current mode. */
 	char afs_mode_string[MAXLINE];
 	/** Used by the sender command. */
@@ -83,6 +81,7 @@ struct misc_meta_data {
 	struct audio_file_data afd;
 };
 
+extern pid_t afs_pid;
 extern struct lls_parse_result *server_lpr;
 
 /**