1LIBTRACEEVENT(3)             libtraceevent Manual             LIBTRACEEVENT(3)
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NAME

6       tep_parse_header_page - Parses the data stored in the header page.
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SYNOPSIS

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

14       The tep_parse_header_page() function parses the header page data from
15       buf, and initializes the tep, trace event parser context, with it. The
16       buffer buf is with size, and is supposed to be copied from
17       tracefs/events/header_page.
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19       Some old kernels do not have header page info, in this case the
20       tep_parse_header_page() function can be called with size equal to 0.
21       The tep context is initialized with default values. The long_size can
22       be used in this use case, to set the size of a long integer to be used.
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RETURN VALUE

25       The tep_parse_header_page() function returns 0 in case of success, or
26       -1 in case of an error.
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EXAMPLE

29           #include <event-parse.h>
30           ...
31           struct tep_handle *tep = tep_alloc();
32           ...
33           char *buf;
34           int size;
35           buf = read_file("/sys/kernel/tracing/events/header_page", &size);
36           if (tep_parse_header_page(tep, buf, size, sizeof(unsigned long)) != 0) {
37                   /* Failed to parse the header page */
38           }
39           ...
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FILES

42           event-parse.h
43                   Header file to include in order to have access to the library APIs.
44           -ltraceevent
45                   Linker switch to add when building a program that uses the library.
46

SEE ALSO

48       libtraceevent(3), trace-cmd(1)
49

AUTHOR

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

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

58       libtraceevent is Free Software licensed under the GNU LGPL 2.1
59

RESOURCES

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

64        1. rostedt@goodmis.org
65           mailto:rostedt@goodmis.org
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67        2. tz.stoyanov@gmail.com
68           mailto:tz.stoyanov@gmail.com
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70        3. linux-trace-devel@vger.kernel.org
71           mailto:linux-trace-devel@vger.kernel.org
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75libtraceevent 1.7.2               04/05/2023                  LIBTRACEEVENT(3)
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