DJWLindenaar's fix race condition and some memory leaks patch

git-svn-id: https://svn.musicpd.org/mpd/trunk@3681 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/command.h

@@ -30,6 +30,7 @@
 
 #define COMMAND_RETURN_KILL	10
 #define COMMAND_RETURN_CLOSE	20
+#define COMMAND_MASTER_READY	30
 
 extern char * current_command;
 extern int command_listNum;

src/conf.c

@@ -112,6 +112,10 @@ void registerConfigParam(char * name, int repeatable, int block) {
 	insertInList(configEntriesList, name, entry);
 }
 
+void finishConf() {
+	freeList(configEntriesList);
+}
+
 void initConf() {
 	configEntriesList = makeList((ListFreeDataFunc *)freeConfigEntry, 1);
 
@@ -295,6 +299,7 @@ void readConf(char * file) {
 
 		freeArgArray(array, numberOfArgs);
 	}
+	fclose(fp);
 }
 
 ConfigParam * getNextConfigParam(char * name, ConfigParam * last) {

src/conf.h

@@ -73,6 +73,7 @@ typedef struct _ConfigParam {
 } ConfigParam;
 
 void initConf();
+void finishConf();
 
 void readConf(char * file);
 

src/main.c

@@ -42,6 +42,7 @@
 #include <stdio.h>
 #include <sys/select.h>
 #include <sys/types.h>
+#include <sys/wait.h>
 #include <sys/stat.h>
 #include <stdlib.h>
 #include <string.h>
@@ -306,6 +307,7 @@ void startMainProcess() {
 		
 		mainPid = pid;
 		masterInitSigHandlers();
+		kill(mainPid, SIGUSR1);
 		while (masterHandlePendingSignals()!=COMMAND_RETURN_KILL)
 			waitOnSignals();
 		/* we're killed */
@@ -320,6 +322,9 @@ void startMainProcess() {
 		finishPaths();
 
 		kill(mainPid, SIGTERM);
+		waitpid(mainPid,NULL,0);
+		finishConf();
+		myfprintfCloseLogFile();
 		exit(EXIT_SUCCESS);
 
 	} else if(pid<0) {
@@ -483,8 +488,8 @@ void killFromPidFile(char * cmd, int killOption) {
 }
 
 int main(int argc, char * argv[]) {
-        FILE * out;
+        FILE * out = NULL;
-        FILE * err;
+        FILE * err = NULL;
         Options options;
 
         closeAllFDs();
@@ -519,8 +524,7 @@ int main(int argc, char * argv[]) {
 	/* This is the main process which has
 	 * been forked from the master process.
 	 */
-	
+        initSigHandlers();
-
 	
 	initPermissions();
 
@@ -539,8 +543,12 @@ int main(int argc, char * argv[]) {
 
         setupLogOutput(&options, out, err);
 
-        openVolumeDevice();
+	/* wait for the master process to get ready so we can start 
-        initSigHandlers();
+	 * playing if readPlaylistState thinks we should*/
+	while (COMMAND_MASTER_READY != handlePendingSignals()) 
+		my_usleep(1);
+
+	openVolumeDevice();
         readPlaylistState();
 
 
@@ -567,6 +575,8 @@ int main(int argc, char * argv[]) {
         finishCommands();
         finishInputPlugins();
 	cleanUpPidFile();
-
+	finishConf();
+	
+	myfprintfCloseLogFile();
         return EXIT_SUCCESS;
 }

src/myfprintf.c

@@ -122,3 +122,10 @@ int myfprintfCloseAndOpenLogFile() {
 
         return 0;
 }
+
+void myfprintfCloseLogFile() {
+        if(myfprintf_stdLogMode) {
+                while(fclose(myfprintf_out)<0 && errno==EINTR);
+                while(fclose(myfprintf_err)<0 && errno==EINTR);
+	}
+}

src/myfprintf.h

@@ -29,4 +29,5 @@ void myfprintf(FILE * fp, char * format, ... );
 
 int myfprintfCloseAndOpenLogFile();
 
+void myfprintfCloseLogFile();
 #endif

src/sig_handlers.c

@@ -56,7 +56,17 @@ int masterHandlePendingSignals() {
 }
 
 int handlePendingSignals() {
-        if(signal_is_pending(SIGINT) || signal_is_pending(SIGTERM)) {
+	/* this SIGUSR1 signal comes before the KILL signals, because there if the process is 
+	 * looping, waiting for this signal, it will not respond to the KILL signal. This might be
+	 * better implemented by using bit-wise defines and or'ing of the COMMAND_FOO as return.
+	 */
+       	if (signal_is_pending(SIGUSR1)) {
+		signal_clear(SIGUSR1);
+		DEBUG("The master process is ready to receive signals\n");
+		return COMMAND_MASTER_READY;
+	}
+	
+	if(signal_is_pending(SIGINT) || signal_is_pending(SIGTERM)) {
                 DEBUG("main process got SIGINT or SIGTERM, exiting\n");
 		return COMMAND_RETURN_KILL;
         }
@@ -135,6 +145,7 @@ void initSigHandlers() {
 	while(sigaction(SIGPIPE,&sa,NULL)<0 && errno==EINTR);
 	sa.sa_handler = chldSigHandler;
 	while(sigaction(SIGCHLD,&sa,NULL)<0 && errno==EINTR);
+        signal_handle(SIGUSR2);
         signal_handle(SIGUSR1);
         signal_handle(SIGINT);
         signal_handle(SIGTERM);