Improve child process reaping (bug #278)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1521 65c4cc65-6c06-0410-ace0-fbb531ad65f3

asterisk.c

@@ -337,11 +337,19 @@ static void hup_handler(int num)
 	ast_module_reload();
 }
 
-
-static void pipe_handler(int num)
+static void child_handler(int sig)
 {
-	/* Ignore sigpipe */
+	int n, status;
+
+	/*
+	 * Reap all dead children -- not just one
+	 */
+	for (n = 0; wait4(-1, &status, WNOHANG, NULL) > 0; n++)
+		;
+	if (n == 0 && option_debug)	
+		ast_log(LOG_DEBUG, "Huh?  Child handler, but nobody there?\n");
 }
+
 static void set_title(char *text)
 {
 	/* Set an X-term or screen title */
@@ -1366,11 +1374,14 @@ int main(int argc, char *argv[])
 	}
 	if (option_console && !option_verbose) 
 		ast_verbose("[ Booting...");
+
 	signal(SIGURG, urg_handler);
 	signal(SIGINT, __quit_handler);
 	signal(SIGTERM, __quit_handler);
 	signal(SIGHUP, hup_handler);
-	signal(SIGPIPE, pipe_handler);
+	signal(SIGCHLD, child_handler);
+	signal(SIGPIPE, SIG_IGN);
+
 	if (set_priority(option_highpriority)) {
 		printf(term_quit());
 		exit(1);

res/res_musiconhold.c

@@ -94,17 +94,10 @@ static struct mohclass *mohclasses;
 
 static ast_mutex_t moh_lock = AST_MUTEX_INITIALIZER;
 
+#define LOCAL_MPG_123 "/usr/local/bin/mpg123"
 #define MPG_123 "/usr/bin/mpg123"
 #define MAX_MP3S 256
 
-static void child_handler(int sig)
-{
-	int status;
-	if (wait4(-1,&status, WNOHANG, NULL)<1)	
-		if (option_debug)	
-			ast_log(LOG_DEBUG, "Huh?  Child handler, but nobody there?\n");
-}
-
 static int spawn_mp3(struct mohclass *class)
 {
 	int fds[2];
@@ -121,7 +114,7 @@ static int spawn_mp3(struct mohclass *class)
 		ast_log(LOG_WARNING, "%s is not a valid directory\n", class->dir);
 		return -1;
  	}
-	argv[0] = MPG_123;
+	argv[0] = "mpg123";
 	argv[1] = "-q";
 	argv[2] = "-s";
 	argv[3] = "--mono";
@@ -190,7 +183,12 @@ static int spawn_mp3(struct mohclass *class)
 			close(x);
 		/* Child */
 		chdir(class->dir);
+		/* Default install is /usr/local/bin */
+		execv(LOCAL_MPG_123, argv);
+		/* Many places have it in /usr/bin */
 		execv(MPG_123, argv);
+		/* Check PATH as a last-ditch effort */
+		execvp("mpg123", argv);
 		ast_log(LOG_WARNING, "Exec failed: %s\n", strerror(errno));
 		exit(1);
 	} else {
@@ -220,7 +218,6 @@ static void *monmp3thread(void *data)
 	tv.tv_usec = 0;
 	error_sec = 0;
 	error_usec = 0;
-	signal(SIGCHLD, child_handler);
 	for(;/* ever */;) {
 		/* Spawn mp3 player if it's not there */
 		if (class->srcfd < 0)  {