lib/vty: add separate output fd support to VTYs

to be used with stdin/stdout terminals, this adds support for writing to
a different FD than we're reading from.  Also fixes error messages from
config load being written to stdin.

[v2: fixed config write]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

(cherry picked from commit 4715a53b4d390e72a06c864a6a505971841e3dc9)

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/vty.h b/lib/vty.h
index f0286202b..7968e92fd 100644
--- a/lib/vty.h
+++ b/lib/vty.h
@@ -34,6 +34,9 @@ struct vty
   /* File descripter of this vty. */
   int fd;
 
+  /* output FD, to support stdin/stdout combination */
+  int wfd;
+
   /* Is this vty connect to file or not */
   enum {VTY_TERM, VTY_FILE, VTY_SHELL, VTY_SHELL_SERV} type;