Let systems without a working fork() use res_musiconhold.

Files mode doesn't require anything special, so that can still be used just fine.

AST-357


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@269426 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -28,7 +28,6 @@
 /*** MODULEINFO
 	<conflict>win32</conflict>
 	<use>dahdi</use>
-	<depend>working_fork</depend>
  ***/
 
 #include "asterisk.h"
@@ -353,6 +352,7 @@ static struct ast_generator moh_file_stream = {
 	.generate = moh_files_generator,
 };
 
+#ifdef HAVE_WORKING_FORK
 static int spawn_mp3(struct mohclass *class)
 {
 	int fds[2];
@@ -605,6 +605,7 @@ static void *monmp3thread(void *data)
 	}
 	return NULL;
 }
+#endif
 
 static int moh0_exec(struct ast_channel *chan, void *data)
 {
@@ -917,6 +918,7 @@ static int init_files_class(struct mohclass *class)
 	return 0;
 }
 
+#ifdef HAVE_WORKING_FORK
 static int init_app_class(struct mohclass *class)
 {
 #ifdef HAVE_DAHDI
@@ -959,6 +961,7 @@ static int init_app_class(struct mohclass *class)
 
 	return 0;
 }
+#endif
 
 /*!
  * \note This function owns the reference it gets to moh
@@ -988,10 +991,16 @@ static int moh_register(struct mohclass *moh, int reload)
 	} else if (!strcasecmp(moh->mode, "mp3") || !strcasecmp(moh->mode, "mp3nb") || 
 			!strcasecmp(moh->mode, "quietmp3") || !strcasecmp(moh->mode, "quietmp3nb") ||
 			!strcasecmp(moh->mode, "httpmp3") || !strcasecmp(moh->mode, "custom")) {
+#ifdef HAVE_WORKING_FORK
 		if (init_app_class(moh)) {
 			moh = mohclass_unref(moh);
 			return -1;
 		}
+#else
+		ast_log(LOG_WARNING, "Cannot use mode '%s' music on hold, as there is no working fork().\n", moh->mode);
+		moh = mohclass_unref(moh);
+		return -1;
+#endif
 	} else {
 		ast_log(LOG_WARNING, "Don't know how to do a mode '%s' music on hold\n", moh->mode);
 		moh = mohclass_unref(moh);