[MERGED] libosmocore[master]: ensure that osmo_fsm vty commands are only installed once
gerrit-no-reply at lists.osmocom.org
Fri Feb 23 11:11:15 UTC 2018
Harald Welte has submitted this change and it was merged.
Change subject: ensure that osmo_fsm vty commands are only installed once
ensure that osmo_fsm vty commands are only installed once
There is a desire to install osmo_fsm vty commands automatically in
a library context, rather than requiring every application which
directly or indirectly uses osmo_fsm to run osmo_fsm_vty_add_cmd().
However, the function install_element_ve() asserts that elements
about to be installed have not already been installed.
This means we cannot shift responsibility into a library context
without first making sure that osmo_fsm commands are only installed
once per combined application+library context, because applications
won't know which commands any of its libraries has already installed.
A simple solution is to use a global flag which is checked by
osmo_fsm_vty_add_cmd() before installing osmo_fsm commands, and
is set once the commands have been installed. This way, no harm
is done if osmo_fsm_vty_add_cmd() is called multiple times.
1 file changed, 12 insertions(+), 0 deletions(-)
Harald Welte: Looks good to me, approved
Jenkins Builder: Verified
diff --git a/src/vty/fsm_vty.c b/src/vty/fsm_vty.c
index 8abb9c9..2947678 100644
@@ -181,8 +181,20 @@
* application if you want to support those commands. */
+ static bool osmo_fsm_vty_cmds_installed;
+ /* Make sure FSM commands get installed only once.
+ * We might be called from libraries or from an application.
+ * An application might be oblivious to the fact that one or
+ * more of its libaries are using osmo_fsm. And likewise,
+ * any given library will not know if another library has
+ * already installled these commands. */
+ if (osmo_fsm_vty_cmds_installed)
+ osmo_fsm_vty_cmds_installed = true;
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Gerrit-Owner: Stefan Sperling <ssperling at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Stefan Sperling <ssperling at sysmocom.de>
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