SYNOPSIS

#include <event-parse.h>

struct tep_format_field *tep_find_common_field(struct tep_event *event, const char *name);
struct tep_format_field *tep_find_field(struct tep_event_ormat *event, const char *name);
struct tep_format_field *tep_find_any_field(struct tep_event *event, const char *name);

DESCRIPTION

These functions search for a field with given name in an event. The field returned can be used to find the field content from within a data record.

The tep_find_common_field() function searches for a common field with name in the event.

The tep_find_field() function searches for an event specific field with name in the event.

The tep_find_any_field() function searches for any field with name in the event.

RETURN VALUE

The tep_find_common_field(), tep_find_field() and _tep_find_any_field() functions return a pointer to the found field, or NULL in case there is no field with the requested name.

EXAMPLE

b'\n
#include <event-parse.h>\n...\nvoid get_htimer_info(struct tep_handle *tep, struct tep_record *record)\n{\n        struct tep_format_field *field;\n        struct tep_event *event;\n        long long softexpires;\n        int mode;\n        int pid;\n\n        event = tep_find_event_by_name(tep, "timer", "hrtimer_start");\n\n        field = tep_find_common_field(event, "common_pid");\n        if (field == NULL) {\n                /* Cannot find "common_pid" field in the event */\n        } else {\n                /* Get pid from the data record */\n                pid = tep_read_number(tep, record->data + field->offset,\n                                      field->size);\n        }\n\n        field = tep_find_field(event, "softexpires");\n        if (field == NULL) {\n                /* Cannot find "softexpires" event specific field in the event */\n        } else {\n                /* Get softexpires parameter from the data record */\n                softexpires = tep_read_number(tep, record->data + field->offset,\n                                              field->size);\n        }\n\n        field = tep_find_any_field(event, "mode");\n        if (field == NULL) {\n                /* Cannot find "mode" field in the event */\n        } else\n        {\n                /* Get mode parameter from the data record */\n                mode = tep_read_number(tep, record->data + field->offset,\n                                       field->size);\n        }\n}\n...
\n'

FILES

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

SEE ALSO

libtraceevent(3), trace-cmd(1)

AUTHOR

Steven Rostedt <rostedt@goodmis.org>, author of libtraceevent.
Tzvetomir Stoyanov <tz.stoyanov@gmail.com>, author of this man page.

REPORTING BUGS

LICENSE

libtraceevent is Free Software licensed under the GNU LGPL 2.1

RESOURCES