83 lines
1.9 KiB
Plaintext
83 lines
1.9 KiB
Plaintext
libtraceevent(3)
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================
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NAME
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----
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tep_parse_header_page - Parses the data stored in the header page.
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SYNOPSIS
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--------
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[verse]
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--
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*#include <event-parse.h>*
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int *tep_parse_header_page*(struct tep_handle pass:[*]_tep_, char pass:[*]_buf_, unsigned long _size_, int _long_size_);
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--
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DESCRIPTION
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-----------
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The _tep_parse_header_page()_ function parses the header page data from _buf_,
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and initializes the _tep_, trace event parser context, with it. The buffer
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_buf_ is with _size_, and is supposed to be copied from
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tracefs/events/header_page.
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Some old kernels do not have header page info, in this case the
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_tep_parse_header_page()_ function can be called with _size_ equal to 0. The
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_tep_ context is initialized with default values. The _long_size_ can be used in
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this use case, to set the size of a long integer to be used.
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RETURN VALUE
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------------
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The _tep_parse_header_page()_ function returns 0 in case of success, or -1
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in case of an error.
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EXAMPLE
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-------
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[source,c]
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--
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#include <event-parse.h>
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...
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struct tep_handle *tep = tep_alloc();
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...
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char *buf;
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int size;
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buf = read_file("/sys/kernel/tracing/events/header_page", &size);
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if (tep_parse_header_page(tep, buf, size, sizeof(unsigned long)) != 0) {
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/* Failed to parse the header page */
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}
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...
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--
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FILES
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-----
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[verse]
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--
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*event-parse.h*
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Header file to include in order to have access to the library APIs.
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*-ltraceevent*
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Linker switch to add when building a program that uses the library.
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--
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SEE ALSO
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--------
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_libtraceevent(3)_, _trace-cmd(1)_
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AUTHOR
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------
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[verse]
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--
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*Steven Rostedt* <rostedt@goodmis.org>, author of *libtraceevent*.
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*Tzvetomir Stoyanov* <tz.stoyanov@gmail.com>, author of this man page.
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--
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REPORTING BUGS
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--------------
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Report bugs to <linux-trace-devel@vger.kernel.org>
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LICENSE
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-------
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libtraceevent is Free Software licensed under the GNU LGPL 2.1
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RESOURCES
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---------
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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