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82 lines
1.9 KiB
82 lines
1.9 KiB
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* <[email protected]>, author of *libtraceevent*. |
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*Tzvetomir Stoyanov* <[email protected]>, 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 <[email protected]> |
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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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