Add comment concerning with it's acceptable to use pipe(2)

diff --git a/include/ac/socket.h b/include/ac/socket.h
index 5ab0dacc7c1955a3b52efbac60e0e22d149394c4..fc1d533b6f6365bf62c7138e6d61c2748934e6ca 100644 (file)
--- a/include/ac/socket.h
+++ b/include/ac/socket.h
@@ -116,6 +116,10 @@ extern char* WSAGetErrorString LDAP_P((int));
 #      define tcp_write( s, buf, len)  write( s, buf, len )
 
 #ifdef HAVE_PIPE
+/*
+ * Only use pipe() on systems where file and socket descriptors 
+ * are interchangable
+ */
 #define USE_PIPE HAVE_PIPE
 #endif