From 0bdeb5e58d8fdf8b0f30461a388768112b0e080c Mon Sep 17 00:00:00 2001 From: David Lamparter Date: Sat, 6 May 2017 06:40:17 +0200 Subject: lib: rewrite zlog lock-free & TLS-buffered This is a full rewrite of the "back end" logging code. It now uses a lock-free list to iterate over logging targets, and the targets themselves are as lock-free as possible. (syslog() may have a hidden internal mutex in the C library; the file/fd targets use a single write() call which should ensure atomicity kernel-side.) Note that some functionality is lost in this patch: - Solaris printstack() backtraces are ditched (unlikely to come back) - the `log-filter` machinery is gone (re-added in followup commit) - `terminal monitor` is temporarily stubbed out. The old code had a race condition with VTYs going away. It'll likely come back rewritten and with vtysh support. - The `zebra_ext_log` hook is gone. Instead, it's now much easier to add a "proper" logging target. v2: TLS buffer to get some actual performance Signed-off-by: David Lamparter --- lib/log_vty.h | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'lib/log_vty.h') diff --git a/lib/log_vty.h b/lib/log_vty.h index fa5627e4bd..0fd60e9b07 100644 --- a/lib/log_vty.h +++ b/lib/log_vty.h @@ -20,5 +20,17 @@ #ifndef __LOG_VTY_H__ #define __LOG_VTY_H__ -extern void log_filter_cmd_init(void); + +#include "lib/hook.h" + +struct vty; + +extern void log_cmd_init(void); +extern void log_config_write(struct vty *vty); +extern int log_level_match(const char *s); +extern void log_show_syslog(struct vty *vty); + +DECLARE_HOOK(zlog_rotate, (), ()) +extern void zlog_rotate(void); + #endif /* __LOG_VTY_H__ */ -- cgit v1.2.3