[27/73] tools lib traceevent: Man page for host endian APIs
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Message ID 20190517193611.4974-28-acme@kernel.org
State Accepted
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  • Untitled series #119075
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Commit Message

Arnaldo Carvalho de Melo May 17, 2019, 7:35 p.m. UTC
From: Tzvetomir Stoyanov <tstoyanov@vmware.com>

Create man pages for libtraceevent APIs:


Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/linux-trace-devel/20190503091119.23399-8-tstoyanov@vmware.com
Link: http://lkml.kernel.org/r/20190510200107.063709363@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 .../libtraceevent-host_endian.txt             | 104 ++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 tools/lib/traceevent/Documentation/libtraceevent-host_endian.txt

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diff --git a/tools/lib/traceevent/Documentation/libtraceevent-host_endian.txt b/tools/lib/traceevent/Documentation/libtraceevent-host_endian.txt
new file mode 100644
index 000000000000..d5d375eb8d1e
--- /dev/null
+++ b/tools/lib/traceevent/Documentation/libtraceevent-host_endian.txt
@@ -0,0 +1,104 @@ 
+tep_is_bigendian, tep_is_local_bigendian, tep_set_local_bigendian - Get / set
+the endianness of the local machine.
+*#include <event-parse.h>*
+enum *tep_endian* {
+int *tep_is_bigendian*(void);
+bool *tep_is_local_bigendian*(struct tep_handle pass:[*]_tep_);
+void *tep_set_local_bigendian*(struct tep_handle pass:[*]_tep_, enum tep_endian _endian_);
+The _tep_is_bigendian()_ gets the endianness of the machine, executing
+the function.
+The _tep_is_local_bigendian()_ function gets the endianness of the local
+machine, saved in the _tep_ handler. The _tep_ argument is the trace event
+parser context. This API is a bit faster than _tep_is_bigendian()_, as it
+returns cached endianness of the local machine instead of checking it each time.
+The _tep_set_local_bigendian()_ function sets the endianness of the local
+machine in the _tep_ handler. The _tep_ argument is trace event parser context.
+The _endian_ argument is the endianness:
+	_TEP_LITTLE_ENDIAN_ - the machine is little endian,
+	_TEP_BIG_ENDIAN_ - the machine is big endian.
+The _tep_is_bigendian()_ function returns non zero if the endianness of the
+machine, executing the code, is big endian and zero otherwise.
+The _tep_is_local_bigendian()_ function returns true, if the endianness of the
+local machine, saved in the _tep_ handler, is big endian, or false otherwise.
+#include <event-parse.h>
+struct tep_handle *tep = tep_alloc();
+	if (tep_is_bigendian())
+		tep_set_local_bigendian(tep, TEP_BIG_ENDIAN);
+	else
+		tep_set_local_bigendian(tep, TEP_LITTLE_ENDIAN);
+	if (tep_is_local_bigendian(tep))
+		printf("This machine you are running on is bigendian\n");
+	else
+		printf("This machine you are running on is little endian\n");
+	Header file to include in order to have access to the library APIs.
+	Linker switch to add when building a program that uses the library.
+_libtraceevent(3)_, _trace-cmd(1)_
+*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
+*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
+Report bugs to  <linux-trace-devel@vger.kernel.org>
+libtraceevent is Free Software licensed under the GNU LGPL 2.1