unix: mkdir VPP_RUN_DIR before opening a socket in it

Change https://gerrit.fd.io/r/#/c/7230/ added a Unix domain
CLI socket in the default startup.conf; however unless you
had previously run VPP with the DPDK plugin enabled the
directory that it is created in. /run/vpp, would not exist
and startup would fail. This directory is typically hosted
in a tmpfs ramdisk and is thus ephemeral.

This patch adds a function that attempts to mkdir VPP_RUN_DIR
and uses it in both the DPDK plugin and the CLI code if the
CLI socket is to be created in that directory.

Change-Id: Ibbf925819099dce2b5eb0fa238b9edca1036d6fd
Signed-off-by: Chris Luke <chrisy@flirble.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/vlib/unix/unix.h b/src/vlib/unix/unix.h
index de607c0f490..ffa92bba1dc 100644
--- a/src/vlib/unix/unix.h
+++ b/src/vlib/unix/unix.h
@@ -43,6 +43,10 @@
 #include <vppinfra/socket.h>
 #include <termios.h>
 
+
+/** VPP runtime ephemeral directory. Typically stored in a tmpfs. */
+#define VPP_RUN_DIR "/run/vpp"
+
 struct unix_file;
 typedef clib_error_t *(unix_file_function_t) (struct unix_file * f);
 
@@ -229,6 +233,8 @@ clib_error_t *foreach_directory_file (char *dir_name,
 							   u8 * file_name),
 				      void *arg, int scan_dirs);
 
+clib_error_t *unix_make_vpp_run_dir (void);
+
 #endif /* included_unix_unix_h */
 
 /*