Linux-Trace-Devel Archive on lore.kernel.org
 help / color / Atom feed
From: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org
Subject: [PATCH 4/8] trace-cmd library: Document the API for log levels
Date: Wed, 28 Apr 2021 10:41:45 +0300
Message-ID: <20210428074149.757163-5-tz.stoyanov@gmail.com> (raw)
In-Reply-To: <20210428074149.757163-1-tz.stoyanov@gmail.com>

Updated trace-cmd library man pages with description of the API for
setting the library log levels:
 tracecmd_set_loglevel()

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 Documentation/libtracecmd/libtracecmd-log.txt | 78 +++++++++++++++++++
 Documentation/libtracecmd/libtracecmd.txt     |  3 +
 2 files changed, 81 insertions(+)
 create mode 100644 Documentation/libtracecmd/libtracecmd-log.txt

diff --git a/Documentation/libtracecmd/libtracecmd-log.txt b/Documentation/libtracecmd/libtracecmd-log.txt
new file mode 100644
index 00000000..de5c2776
--- /dev/null
+++ b/Documentation/libtracecmd/libtracecmd-log.txt
@@ -0,0 +1,78 @@
+libtracecmd(3)
+=============
+
+NAME
+----
+tracecmd_set_loglevel - Set log level of the library
+
+SYNOPSIS
+--------
+[verse]
+--
+*#include <trace-cmd.h>*
+
+int *tracecmd_set_loglevel*(enum tep_loglevel _level_);
+--
+
+DESCRIPTION
+-----------
+The _tracecmd_set_loglevel()_ function sets the level of the library logs that will be printed on
+the console. See _libtraceevent(3)_ for detailed desciription of the log levels. Setting the log
+level to specific value means that logs from the previous levels will be printed too. For example
+_TEP_LOG_WARNING_ will print any logs with severity _TEP_LOG_WARNING_, _TEP_LOG_ERROR_ and
+_TEP_LOG_CRITICAL_. The default log level is _TEP_LOG_CRITICAL_.  When a new level is set, it is
+also propagated to the libtracefs and libtraceevent.
+
+EXAMPLE
+-------
+[source,c]
+--
+#include <trace-cmd.h>
+...
+tracecmd_set_loglevel(TEP_LOG_ALL);
+...
+/* call libtracecmd, libtracefs or libtraceevent APIs and observe any logs they produce */
+...
+tracecmd_set_loglevel(TEP_LOG_CRITICAL);
+--
+
+FILES
+-----
+[verse]
+--
+*trace-cmd.h*
+	Header file to include in order to have access to the library APIs.
+*-ltracecmd*
+	Linker switch to add when building a program that uses the library.
+--
+
+SEE ALSO
+--------
+_libtracefs(3)_,
+_libtraceevent(3)_,
+_trace-cmd(1)_
+_trace-cmd.dat(5)_
+
+AUTHOR
+------
+[verse]
+--
+*Steven Rostedt* <rostedt@goodmis.org>
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>
+--
+REPORTING BUGS
+--------------
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+
+LICENSE
+-------
+libtracecmd is Free Software licensed under the GNU LGPL 2.1
+
+RESOURCES
+---------
+https://git.kernel.org/pub/scm/utils/trace-cmd/trace-cmd.git/
+
+COPYING
+-------
+Copyright \(C) 2021 VMware, Inc. Free use of this software is granted under
+the terms of the GNU Public License (GPL).
diff --git a/Documentation/libtracecmd/libtracecmd.txt b/Documentation/libtracecmd/libtracecmd.txt
index adc9321c..dc528ce0 100644
--- a/Documentation/libtracecmd/libtracecmd.txt
+++ b/Documentation/libtracecmd/libtracecmd.txt
@@ -33,6 +33,9 @@ Read tracing instances from a trace file:
 Get traceing peer information from a trace file:
 	unsigned long long *tracecmd_get_traceid*(struct tracecmd_input pass:[*]_handle_);
 	int *tracecmd_get_guest_cpumap*(struct tracecmd_input pass:[*]_handle_, unsigned long long _trace_id_, const char pass:[*]pass:[*]_name_, int pass:[*]_vcpu_count_, const int pass:[*]pass:[*]_cpu_pid_);
+
+Control library logs:
+	int *tracecmd_set_loglevel*(enum tep_loglevel _level_);
 --
 
 DESCRIPTION
-- 
2.30.2


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-28  7:41 [PATCH 0/8] Changes to trace-cmd logs Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 1/8] trace-cmd library: Use tep_vprint() for logs Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 2/8] trace-cmd library: Add tracecmd_info() log function Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 3/8] trace-cmd library: Add log levels Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` Tzvetomir Stoyanov (VMware) [this message]
2021-04-28  7:41 ` [PATCH 5/8] trace-cmd library: Renamed tracecmd_fatal() to tracecmd_critical() Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 6/8] trace-cmd library: Set debug log level in debug mode Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 7/8] trace-cmd report: Set the log level with -V and -q options Tzvetomir Stoyanov (VMware)
2021-04-28  7:41 ` [PATCH 8/8] trace-cmd: Add new function to set log level Tzvetomir Stoyanov (VMware)

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210428074149.757163-5-tz.stoyanov@gmail.com \
    --to=tz.stoyanov@gmail.com \
    --cc=linux-trace-devel@vger.kernel.org \
    --cc=rostedt@goodmis.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Trace-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-trace-devel/0 linux-trace-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-trace-devel linux-trace-devel/ https://lore.kernel.org/linux-trace-devel \
		linux-trace-devel@vger.kernel.org
	public-inbox-index linux-trace-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-trace-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git