document gnutls_fd_in_use()

diff --git a/doc/cha-gtls-app.texi b/doc/cha-gtls-app.texi
index 805c0b51c551a5ad68039dba881321f8169b2680..0c259492158ece3162a3e4984f584ad728d2b4b2 100644 (file)
--- a/doc/cha-gtls-app.texi
+++ b/doc/cha-gtls-app.texi
@@ -271,8 +271,7 @@ library.
 @node Initialization
 @subsection Initialization
 
-GnuTLS must be initialized before it can be used.  The library is
-initialized on load; prior to 3.3.0 was initialized by calling @funcref{gnutls_global_init}. 
+The GnuTLS library is initialized on load; prior to 3.3.0 was initialized by calling @funcref{gnutls_global_init}. 
 The initialization typically enables CPU-specific acceleration, performs any required
 precalculations needed, opens any required system devices (e.g., /dev/urandom on Linux)
 and initializes subsystems that could be used later.
@@ -280,6 +279,11 @@ and initializes subsystems that could be used later.
 The resources allocated by the initialization process will be released 
 on library deinitialization, or explictly by calling @funcref{gnutls_global_deinit}.
 
+Note that during initialization file descriptors may be kept open by
+GnuTLS (e.g. /dev/urandom). The helper function @funcref{gnutls_fd_in_use}
+is given to assist applications closing all unknown file descriptors
+on initialization.
+
 @c In order to take advantage of the internationalization features in
 @c GnuTLS, such as translated error messages, the application must set
 @c the current locale using @code{setlocale} before initializing GnuTLS.