Return the correct error values from gnutls.c

* src/gnutls.c (emacs_gnutls_read): Set errno to the value
expected by process.c.
(gnutls_try_handshake): Set gnutls_p to true earlier to avoid
possible race condition with the process.c socket polling
functions.

1 files changed, 7 insertions, 4 deletions

diff --git a/src/gnutls.c b/src/gnutls.c
index d1b34c5bf7f..988c0104869 100644
--- a/src/gnutls.c
+++ b/src/gnutls.c
@@ -403,6 +403,9 @@ gnutls_try_handshake (struct Lisp_Process *proc)
   gnutls_session_t state = proc->gnutls_state;
   int ret;
 
+  if (proc->is_non_blocking_client)
+    proc->gnutls_p = true;
+
   do
     {
       ret = gnutls_handshake (state);
@@ -414,9 +417,6 @@ gnutls_try_handshake (struct Lisp_Process *proc)
 
   proc->gnutls_initstage = GNUTLS_STAGE_HANDSHAKE_TRIED;
 
-  if (proc->is_non_blocking_client)
-    proc->gnutls_p = true;
-
   if (ret == GNUTLS_E_SUCCESS)
     {
       /* Here we're finally done.  */
@@ -541,7 +541,10 @@ emacs_gnutls_read (struct Lisp_Process *proc, char *buf, ptrdiff_t nbyte)
   gnutls_session_t state = proc->gnutls_state;
 
   if (proc->gnutls_initstage != GNUTLS_STAGE_READY)
-    return -1;
+    {
+      errno = EAGAIN;
+      return -1;
+    }
 
   rtnval = gnutls_record_recv (state, buf, nbyte);
   if (rtnval >= 0)