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118 lines
2.9 KiB
118 lines
2.9 KiB
libtraceevent(3) |
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================ |
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NAME |
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---- |
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tep_find_common_field, tep_find_field, tep_find_any_field - |
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Search for a field in an event. |
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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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struct tep_format_field pass:[*]*tep_find_common_field*(struct tep_event pass:[*]_event_, const char pass:[*]_name_); |
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struct tep_format_field pass:[*]*tep_find_field*(struct tep_event_ormat pass:[*]_event_, const char pass:[*]_name_); |
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struct tep_format_field pass:[*]*tep_find_any_field*(struct tep_event pass:[*]_event_, const char pass:[*]_name_); |
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-- |
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DESCRIPTION |
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----------- |
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These functions search for a field with given name in an event. The field |
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returned can be used to find the field content from within a data record. |
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The _tep_find_common_field()_ function searches for a common field with _name_ |
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in the _event_. |
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The _tep_find_field()_ function searches for an event specific field with |
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_name_ in the _event_. |
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The _tep_find_any_field()_ function searches for any field with _name_ in the |
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_event_. |
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RETURN VALUE |
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------------ |
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The _tep_find_common_field(), _tep_find_field()_ and _tep_find_any_field()_ |
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functions return a pointer to the found field, or NULL in case there is no field |
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with the requested name. |
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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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void get_htimer_info(struct tep_handle *tep, struct tep_record *record) |
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{ |
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struct tep_format_field *field; |
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struct tep_event *event; |
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long long softexpires; |
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int mode; |
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int pid; |
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event = tep_find_event_by_name(tep, "timer", "hrtimer_start"); |
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field = tep_find_common_field(event, "common_pid"); |
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if (field == NULL) { |
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/* Cannot find "common_pid" field in the event */ |
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} else { |
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/* Get pid from the data record */ |
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pid = tep_read_number(tep, record->data + field->offset, |
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field->size); |
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} |
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field = tep_find_field(event, "softexpires"); |
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if (field == NULL) { |
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/* Cannot find "softexpires" event specific field in the event */ |
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} else { |
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/* Get softexpires parameter from the data record */ |
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softexpires = tep_read_number(tep, record->data + field->offset, |
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field->size); |
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} |
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field = tep_find_any_field(event, "mode"); |
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if (field == NULL) { |
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/* Cannot find "mode" field in the event */ |
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} else |
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{ |
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/* Get mode parameter from the data record */ |
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mode = tep_read_number(tep, record->data + field->offset, |
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field->size); |
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} |
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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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