sys: improve sockaddr_un description

1. Embed real filename.
2. Use proc type for unique identifiers.

2 files changed, 14 insertions, 10 deletions

diff --git a/prog/rand.go b/prog/rand.go
index 7289e2969..77add6615 100644
--- a/prog/rand.go
+++ b/prog/rand.go
@@ -661,8 +661,17 @@ func (r *randGen) generateArg(s *state, typ sys.Type) (arg *Arg, calls []*Call)
 			data := r.randString(s, a.Values, a.Dir())
 			return dataArg(a, data), nil
 		case sys.BufferFilename:
-			filename := r.filename(s)
-			return dataArg(a, []byte(filename)), nil
+			var data []byte
+			if a.Dir() == sys.DirOut {
+				r.choose(
+					10, func() { data = make([]byte, r.Intn(100)) },
+					10, func() { data = make([]byte, r.Intn(108)) }, // UNIX_PATH_MAX
+					10, func() { data = make([]byte, r.Intn(4096)) }, // PATH_MAX
+				)
+			} else {
+				data = []byte(r.filename(s))
+			}
+			return dataArg(a, data), nil
 		case sys.BufferText:
 			return dataArg(a, r.generateText(a.Text)), nil
 		default:
diff --git a/sys/socket.txt b/sys/socket.txt
index 7c17497f4..4ac9e4b27 100644
--- a/sys/socket.txt
+++ b/sys/socket.txt
@@ -225,18 +225,13 @@ sockaddr_un [
 
 sockaddr_un_file {
 	family	flags[unix_socket_family, int16]
-# TODO: this must be an embeded file name (currently filename implies indirection).
-	path	array[int8]
-}
+	path	filename
+} [packed]
 
 sockaddr_un_abstract {
 	family	flags[unix_socket_family, int16]
 	ind	const[0, int8]
-# To ensure isolation.
-# This does not work: prog tries to use output sockaddr_un to create pid's.
-# But since it is in a union, the call does not always creates the resource. 
-#	pid	pid
-	id	int32
+	id	proc[int32, 20000, 4]
 }
 
 msghdr_un {