---
name: "tep_parse_header_page"
section: "3"
platform: "linux"
package: "libtraceevent"
version: "1:1.9.1-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/tep_parse_header_page"
---

# tep\_parse\_header\_page(3)

Parses the data stored in the header page.

## NAME

tep\_parse\_header\_page - Parses the data stored in the header page.

## SYNOPSIS

```
#include <event-parse.h>
int tep_parse_header_page(struct tep_handle *tep, char *buf, unsigned long size, int long_size);
```

## DESCRIPTION

The **tep\_parse\_header\_page()** function parses the header page data from *buf*, and initializes the *tep*, trace event parser context, with it. The buffer *buf* is with *size*, and is supposed to be copied from tracefs/events/header\_page.

Some old kernels do not have header page info, in this case the **tep\_parse\_header\_page()** function can be called with *size* equal to 0. The *tep* context is initialized with default values. The *long\_size* can be used in this use case, to set the size of a long integer to be used.

## RETURN VALUE

The **tep\_parse\_header\_page()** function returns 0 in case of success, or -1 in case of an error.

## EXAMPLE

```
#include <event-parse.h>
...
struct tep_handle *tep = tep_alloc();
...
char *buf;
int size;
buf = read_file("/sys/kernel/tracing/events/header_page", &size);
if (tep_parse_header_page(tep, buf, size, sizeof(unsigned long)) != 0) {
        /* Failed to parse the header page */
}
...
```

## 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)](/libtraceevent/3.md), [**trace-cmd**(1)](/trace-cmd/1.md)

## 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