removing debug messages from signal handlers

As unfortunate as it is to remove such useful debugging messages, it's
necessary to fix a potential deadlock with signal handling.  A bunch of
functions the debug functions call aren't safe to call from a signal
handler.  There are some alternate solutions, but they're neither pretty
nor simple.  So just remove them entirely for now.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6828 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/decode.c

@@ -44,23 +44,25 @@ void decodeSigHandler(int sig, siginfo_t * si, void *v)
 	if (sig == SIGCHLD) {
 		int status;
 		if (decode_pid == wait3(&status, WNOHANG, NULL)) {
+			/*
 			if (WIFSIGNALED(status)) {
 				if (WTERMSIG(status) != SIGTERM) {
 					ERROR("decode process died from "
 					      "signal: %i\n", WTERMSIG(status));
 				}
 			}
+			*/
 			decode_pid = 0;
 			getPlayerData()->playerControl.decode_pid = 0;
 		}
 	} else if (sig == SIGTERM) {
 		int pid = decode_pid;
 		if (pid > 0) {
-			DEBUG("player (or child) got SIGTERM\n");
+			/* DEBUG("player (or child) got SIGTERM\n"); */
 			kill(pid, SIGCONT);
 			kill(pid, SIGTERM);
-		} else
+		} /* else
-			DEBUG("decoder (or child) got SIGTERM\n");
+			DEBUG("decoder (or child) got SIGTERM\n"); */
 		exit(EXIT_SUCCESS);
 	}
 }

src/directory.c

@@ -130,20 +130,22 @@ void directory_sigChldHandler(int pid, int status)
 {
 	if (directory_updatePid == pid) {
 		if (WIFSIGNALED(status) && WTERMSIG(status) != SIGTERM) {
-			ERROR("update process died from a "
+			/* ERROR("update process died from a "
-			      "non-TERM signal: %i\n", WTERMSIG(status));
+			      "non-TERM signal: %i\n", WTERMSIG(status)); */
 		} else if (!WIFSIGNALED(status)) {
 			switch (WEXITSTATUS(status)) {
 			case DIRECTORY_UPDATE_EXIT_UPDATE:
 				directory_reReadDB = 1;
-				DEBUG("directory_sigChldHandler: "
+				/* DEBUG("directory_sigChldHandler: "
-				      "updated db\n");
+				      "updated db\n"); */
 			case DIRECTORY_UPDATE_EXIT_NOUPDATE:
-				DEBUG("directory_sigChldHandler: "
+				/* DEBUG("directory_sigChldHandler: "
-				      "update exited succesffully\n");
+				      "update exited succesffully\n"); */
 				break;
+			/*
 			default:
 				ERROR("error updating db\n");
+			*/
 			}
 		}
 		clearUpdatePid();

src/player.c

@@ -85,6 +85,7 @@ void player_sigChldHandler(int pid, int status)
 {
 	if (player_pid == pid) 
 	{
+		/*
 		DEBUG("SIGCHLD caused by player process\n");
 		if (WIFSIGNALED(status) && 
 		    WTERMSIG(status) != SIGTERM &&
@@ -93,17 +94,20 @@ void player_sigChldHandler(int pid, int status)
 			ERROR("player process died from signal: %i\n",
 			      WTERMSIG(status));
 		}
+		*/
 		resetPlayer();
 	} 
 	else if (pid == getPlayerData()->playerControl.decode_pid &&
 		 player_pid <= 0) 
 	{
+		/*
 		if (WIFSIGNALED(status) && WTERMSIG(status) != SIGTERM) 
 		{
 			ERROR("(caught by master parent) "
 			      "decode process died from a "
 			      "non-TERM signal: %i\n", WTERMSIG(status));
 		}
+		*/
 		getPlayerData()->playerControl.decode_pid = 0;
 	}
 }

src/sig_handlers.c

@@ -62,7 +62,7 @@ static void chldSigHandler(int signal)
 {
 	int status;
 	int pid;
-	DEBUG("main process got SIGCHLD\n");
+	/* DEBUG("main process got SIGCHLD\n"); */
 	while (0 != (pid = wait3(&status, WNOHANG, NULL))) {
 		if (pid < 0) {
 			if (errno == EINTR)