libthread: add threadmaybackground

Programs that want to background themselves now need
to define threadmaybackground returning 1.
This avoids a confusing (to people and debuggers)
extra parent process for all the threaded programs
that will never want to background themselves.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/cmd/9pserve.c b/src/cmd/9pserve.c
index 255bcbb2..e26eef14 100644
--- a/src/cmd/9pserve.c
+++ b/src/cmd/9pserve.c
@@ -137,6 +137,12 @@ usage(void)
 	threadexitsall("usage");
 }
 
+int
+threadmaybackground(void)
+{
+	return 1;
+}
+
 uchar vbuf[128];
 extern int _threaddebuglevel;
 void