LIBTRACEEVENT(3)             libtraceevent Manual             LIBTRACEEVENT(3)

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), 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

libtraceevent                     01/13/2024                  LIBTRACEEVENT(3)