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_int.h | 59 ----------------------------------------------------------- 1 file changed, 59 deletions(-) delete mode 100644 lib/log_int.h (limited to 'lib/log_int.h') diff --git a/lib/log_int.h b/lib/log_int.h deleted file mode 100644 index 287e626eab..0000000000 --- a/lib/log_int.h +++ /dev/null @@ -1,59 +0,0 @@ -/* - * Zebra logging funcions. - * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro - * - * This file is part of GNU Zebra. - * - * GNU Zebra is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2, or (at your option) any - * later version. - * - * GNU Zebra is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; see the file COPYING; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#ifndef _ZEBRA_LOG_PRIVATE_H -#define _ZEBRA_LOG_PRIVATE_H - -#include "log.h" - -#ifdef __cplusplus -extern "C" { -#endif - -struct zlog { - const char *ident; /* daemon name (first arg to openlog) */ - const char *protoname; - unsigned short instance; - int maxlvl[ZLOG_NUM_DESTS]; /* maximum priority to send to associated - logging destination */ - int default_lvl; /* maxlvl to use if none is specified */ - FILE *fp; - char *filename; - int facility; /* as per syslog facility */ - int record_priority; /* should messages logged through stdio include the - priority of the message? */ - int syslog_options; /* 2nd arg to openlog */ - int timestamp_precision; /* # of digits of subsecond precision */ -}; - -/* Default logging strucutre. */ -extern struct zlog *zlog_default; - -extern const char *zlog_priority[]; - -/* Generic function for zlog. */ -extern void vzlog(int priority, const char *format, va_list args); - -#ifdef __cplusplus -} -#endif - -#endif /* _ZEBRA_LOG_PRIVATE_H */ -- cgit v1.2.3