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

6       tep_read_number_field - Reads a number from raw data.
7

SYNOPSIS

9       #include <event-parse.h>
10
11       int tep_read_number_field(struct tep_format_field *field, const void *data, unsigned long long *value);
12

DESCRIPTION

14       The tep_read_number_field() function reads the value of the field from
15       the raw data and stores it in the value. The function sets the value
16       according to the endianness of the raw data and the current machine and
17       stores it in value.
18

RETURN VALUE

20       The tep_read_number_field() function retunrs 0 in case of success, or
21       -1 in case of an error.
22

EXAMPLE

24           #include <event-parse.h>
25           ...
26           struct tep_handle *tep = tep_alloc();
27           ...
28           struct tep_event *event = tep_find_event_by_name(tep, "timer", "hrtimer_start");
29           ...
30           void process_record(struct tep_record *record)
31           {
32                   unsigned long long pid;
33                   struct tep_format_field *field_pid = tep_find_common_field(event, "common_pid");
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35                   if (tep_read_number_field(field_pid, record->data, &pid) != 0) {
36                           /* Failed to get "common_pid" value */
37                   }
38           }
39           ...
40

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.
53

REPORTING BUGS

55       Report bugs to <linux-trace-devel@vger.kernel.org[3]>
56

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/
62

NOTES

64        1. rostedt@goodmis.org
65           mailto:rostedt@goodmis.org
66
67        2. tz.stoyanov@gmail.com
68           mailto:tz.stoyanov@gmail.com
69
70        3. linux-trace-devel@vger.kernel.org
71           mailto:linux-trace-devel@vger.kernel.org
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75libtraceevent 1.2.1               07/22/2021                  LIBTRACEEVENT(3)
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