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LIBTRACEEVENT(3) libtraceevent Manual LIBTRACEEVENT(3)

NAME

tep_get_header_page_size, tep_get_header_timestamp_size, tep_is_old_format - Get the data stored in the header page, in kernel context.

SYNOPSIS

#include <event-parse.h>
int tep_get_header_page_size(struct tep_handle *tep);
int tep_get_header_timestamp_size(struct tep_handle *tep);
bool tep_is_old_format(struct tep_handle *tep);

DESCRIPTION

These functions retrieve information from kernel context, stored in tracefs events/header_page. Old kernels do not have header page info, so default values from user space context are used.

The tep_get_header_page_size() function returns the size of a long integer, in kernel context. The tep argument is trace event parser context. This information is retrieved from tracefs events/header_page, "commit" field.

The tep_get_header_timestamp_size() function returns the size of timestamps, in kernel context. The tep argument is trace event parser context. This information is retrieved from tracefs events/header_page, "timestamp" field.

The tep_is_old_format() function returns true if the kernel predates the addition of events/header_page, otherwise it returns false.

RETURN VALUE

The tep_get_header_page_size() function returns the size of a long integer, in bytes.

The tep_get_header_timestamp_size() function returns the size of timestamps, in bytes.

The tep_is_old_format() function returns true, if an old kernel is used to generate the tracing data, which has no event/header_page. If the kernel is new, or tep is NULL, false is returned.

EXAMPLE

#include <event-parse.h>
...
struct tep_handle *tep = tep_alloc();
...

int longsize;
int timesize;
bool old;
longsize = tep_get_header_page_size(tep);
timesize = tep_get_header_timestamp_size(tep);
old = tep_is_old_format(tep);
printf ("%s kernel is used to generate the tracing data.\n",
old?"Old":"New");
printf("The size of a long integer is %d bytes.\n", longsize);
printf("The timestamps size is %d bytes.\n", timesize); ...

FILES

event-parse.h

Header file to include in order to have access to the library APIs. -ltraceevent
Linker switch to add when building a program that uses the library.

SEE ALSO

libtraceevent(3), trace-cmd(1)

AUTHOR

Steven Rostedt <rostedt@goodmis.org[1]>, author of libtraceevent.
Tzvetomir Stoyanov <tz.stoyanov@gmail.com[2]>, author of this man page.

REPORTING BUGS

Report bugs to <linux-trace-devel@vger.kernel.org[3]>

LICENSE

libtraceevent is Free Software licensed under the GNU LGPL 2.1

RESOURCES

https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/

NOTES

1.
rostedt@goodmis.org
mailto:rostedt@goodmis.org
2.
tz.stoyanov@gmail.com
mailto:tz.stoyanov@gmail.com
3.
linux-trace-devel@vger.kernel.org
mailto:linux-trace-devel@vger.kernel.org
09/24/2022 libtraceevent 1.6.3