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lib: add frr_config_pre hook

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... for any initialization that needs to run after forking, but that
would be racy if it were just scheduled on the thread_master (since the
config load is also just a thread callback, ordering would be undefined
for another scheduled thread callback.)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2021-04-22 13:18:19 +02:00
parent 2bafda27a6
commit bf645e31f6
2 changed files with 7 additions and 0 deletions
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3
lib/libfrr.c
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@ -46,6 +46,7 @@
#include "frrscript.h"
DEFINE_HOOK(frr_late_init, (struct thread_master * tm), (tm));
DEFINE_HOOK(frr_config_pre, (struct thread_master * tm), (tm));
DEFINE_HOOK(frr_config_post, (struct thread_master * tm), (tm));
DEFINE_KOOH(frr_early_fini, (), ());
DEFINE_KOOH(frr_fini, (), ());
@ -931,6 +932,8 @@ static void frr_daemonize(void)
*/
static int frr_config_read_in(struct thread *t)
{
hook_call(frr_config_pre, master);
if (!vty_read_config(vty_shared_candidate_config, di->config_file,
config_default)
&& di->backup_config_file) {

4
lib/libfrr.h
View file

@ -141,8 +141,12 @@ extern enum frr_cli_mode frr_get_cli_mode(void);
extern uint32_t frr_get_fd_limit(void);
extern bool frr_is_startup_fd(int fd);
/* call order of these hooks is as ordered here */
DECLARE_HOOK(frr_late_init, (struct thread_master * tm), (tm));
/* fork() happens between late_init and config_pre */
DECLARE_HOOK(frr_config_pre, (struct thread_master * tm), (tm));
DECLARE_HOOK(frr_config_post, (struct thread_master * tm), (tm));
extern void frr_config_fork(void);
extern void frr_run(struct thread_master *master);