when doing signal functions (like sigaction) make sure it wasn't interrupted by a signal (errno==EINTR)

git-svn-id: https://svn.musicpd.org/mpd/trunk@729 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/directory.c

@@ -31,6 +31,7 @@
 #include "volume.h"
 #include "mpd_types.h"
 #include "sig_handlers.h"
+#include "player.h"
 
 #include <string.h>
 #include <sys/types.h>
@@ -101,6 +102,10 @@ Directory * getDirectory(char * name);
 Song * getSongDetails(char * file, char ** shortnameRet, 
 		Directory ** directoryRet);
 
+void clearUpdatePid() {
+	directory_updatePid = 0;
+}
+
 int isUpdatingDB() {
 	if(directory_updatePid>0 || directory_reReadDB) {
 		return directory_updateJobId;
@@ -120,7 +125,7 @@ void directory_sigChldHandler(int pid, int status) {
 					"updated db succesffully\n");
 			directory_reReadDB = 1;
 		}
-		directory_updatePid = 0;
+		clearUpdatePid();
 	}
 }
 
@@ -144,8 +149,10 @@ int updateInit(FILE * fp, List * pathList) {
 	blockSignals();	
 	directory_updatePid = fork();
        	if(directory_updatePid==0) {
-		unblockSignals();
               	/* child */
+		clearPlayerPid();
+	
+		unblockSignals();
 
 		finishSigHandlers();
                	close(listenSocket);

src/directory.h

@@ -31,6 +31,8 @@ extern char directorydb[MAXPATHLEN+1];
 
 void readDirectoryDBIfUpdateIsFinished();
 
+void clearUpdatePid();
+
 int isUpdatingDB();
 
 void directory_sigChldHandler(int pid, int status);

src/player.c

@@ -46,13 +46,15 @@
 #include <fcntl.h>
 
 volatile int player_pid = 0;
-volatile int player_termSent = 0;
+
+void clearPlayerPid() {
+	player_pid = 0;
+}
 
 void resetPlayer() {
 	int pid;
 
-	player_pid = 0;
-	player_termSent = 0;
+	clearPlayerPid();
 	getPlayerData()->playerControl.stop = 0;
 	getPlayerData()->playerControl.play = 0;
 	getPlayerData()->playerControl.pause = 0;
@@ -97,6 +99,8 @@ int playerInit() {
 		PlayerControl * pc = &(getPlayerData()->playerControl);
 		struct sigaction sa;
 
+		clearUpdatePid();
+
 		unblockSignals();
 
 		sa.sa_flags = 0;
@@ -104,11 +108,11 @@ int playerInit() {
 
 		finishSigHandlers();
 		sa.sa_handler = decodeSigHandler;
-		sigaction(SIGCHLD,&sa,NULL);
-		sigaction(SIGTERM,&sa,NULL);
-		sigaction(SIGINT,&sa,NULL);
+		while(sigaction(SIGCHLD,&sa,NULL)<0 && errno==EINTR);
+		while(sigaction(SIGTERM,&sa,NULL)<0 && errno==EINTR);
+		while(sigaction(SIGINT,&sa,NULL)<0 && errno==EINTR);
 
-		close(listenSocket);
+		while(close(listenSocket)<0 && errno==EINTR);
 		freeAllInterfaces();
 		closeMp3Directory();
 		finishPlaylist();

src/player.h

@@ -79,6 +79,8 @@ typedef struct _PlayerControl {
 	volatile int decode_pid;
 } PlayerControl;
 
+void clearPlayerPid();
+
 void player_sigChldHandler(int pid, int status);
 
 int playerPlay(FILE * fp, char * utf8file);

src/sig_handlers.c

@@ -67,9 +67,9 @@ void initSigHandlers() {
 	sa.sa_flags = 0;
 	sigemptyset(&sa.sa_mask);
 	sa.sa_handler = SIG_IGN;
-	sigaction(SIGPIPE,&sa,NULL);
+	while(sigaction(SIGPIPE,&sa,NULL)<0 && errno==EINTR);
 	sa.sa_handler = chldSigHandler;
-	sigaction(SIGCHLD,&sa,NULL);
+	while(sigaction(SIGCHLD,&sa,NULL)<0 && errno==EINTR);
         signal_handle(SIGUSR1);
         signal_handle(SIGINT);
         signal_handle(SIGTERM);
@@ -90,7 +90,7 @@ void blockSignals() {
 	sigaddset(&sset,SIGCHLD);
 	sigaddset(&sset,SIGUSR1);
 	sigaddset(&sset,SIGHUP);
-	sigprocmask(SIG_BLOCK,&sset,NULL);
+	while(sigprocmask(SIG_BLOCK,&sset,NULL)<0 && errno==EINTR);
 }
 
 void unblockSignals() {
@@ -100,5 +100,5 @@ void unblockSignals() {
 	sigaddset(&sset,SIGCHLD);
 	sigaddset(&sset,SIGUSR1);
 	sigaddset(&sset,SIGHUP);
-	sigprocmask(SIG_UNBLOCK,&sset,NULL);
+	while(sigprocmask(SIG_UNBLOCK,&sset,NULL)<0 && errno==EINTR);
 }

src/signal_check.c

@@ -1,5 +1,7 @@
 #include "signal_check.h"
 
+#include <errno.h>
+
 volatile sig_atomic_t __caught_signals[NSIG];
 
 static void __signal_handler(int sig)
@@ -12,7 +14,7 @@ static void __set_signal_handler(int sig, void (* handler)(int))
         struct sigaction act;
         act.sa_flags = 0;
         act.sa_handler = handler;
-        sigaction(sig, &act, 0);
+        while(sigaction(sig, &act, 0) && errno==EINTR);
 }
 
 void signal_handle(int sig)