SYNOPSIS

#include <tracefs.h>

struct tep_handle *tracefs_local_events(const char *tracing_dir);
struct tep_handle *tracefs_local_events_system(const char *tracing_dir, const char * const *sys_names);
int tracefs_fill_local_events(const char *tracing_dir, struct tep_handle *tep, int *parsing_failures);

DESCRIPTION

Functions for initializing a tep handler with trace events from the local system.

The tracefs_local_events() function allocates a new tep handler and initializes it with events from all trace systems, located in the given tracing_dir directory. This could be NULL or the location of the tracefs mount point for the trace systems of the local machine, or it may be a path to a copy of the tracefs directory from another machine.

The tracefs_local_events_system() function allocates a new tep handler and initializes it with events from specified trace systems sys_names, located in the given tracing_dir directory. This could be NULL or the location of the tracefs mount point for the trace systems of the local machine, or it may be a path to a copy of the tracefs directory from another machine. The sys_names argument is an array of trace system names, that will be used for tep handler initialization. The last element in that array must be a NULL pointer.

The tracefs_fill_local_events() function initializes already allocated tep handler with events from all trace systems, located in the given tracing_dir directory. This could be NULL or the location of the tracefs mount point for the trace systems of the local machine, or it may be a path to a copy of the tracefs directory from another machine. The tep argument must be a pointer to already allocated tep handler, that is going to be initialized. The parsing_failures argument could be NULL or a pointer to an integer, where the number of failures while parsing the event files are returned.

RETURN VALUE

The tracefs_local_events() and tracefs_local_events_system() functions return pointer to allocated and initialized tep handler, or NULL in case of an error. The returned tep handler must be freed with tep_free(3).

The tracefs_fill_local_events() function returns -1 in case of an error or 0 otherwise.

EXAMPLE

FILES

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

SEE ALSO

libtracefs(3), libtraceevent(3), trace-cmd(1)

AUTHOR

Steven Rostedt <rostedt@goodmis.org>
Tzvetomir Stoyanov <tz.stoyanov@gmail.com>

REPORTING BUGS

LICENSE

libtracefs is Free Software licensed under the GNU LGPL 2.1

RESOURCES

COPYING

Copyright (C) 2020 VMware, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).