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// SPDX-License-Identifier: LGPL-2.1
/*
* Copyright (C) 2021, VMware, Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
*
*/
#include <stdlib.h>
#include <errno.h>
#include "tracefs.h"
#include "tracefs-local.h"
#define EPROBE_DEFAULT_GROUP "eprobes"
/**
* tracefs_eprobe_alloc - Allocate new eprobe
* @system: The system name (NULL for the default eprobes)
* @event: The name of the event to create
* @target_system: The system of the target event
* @target_event: The name of the target event
* @fetchargs: String with arguments, that will be fetched from @target_event
*
* Allocate an eprobe context that will be in the @system group (or eprobes if
* @system is NULL). Have the name of @event. The new eprobe will be attached to
* given @target_event which is in the given @target_system. The arguments
* described in @fetchargs will fetched from the @target_event.
*
* The eprobe is not created in the system.
*
* Return a pointer to a eprobe context on success, or NULL on error.
* The returned pointer must be freed with tracefs_dynevent_free()
*
*/
struct tracefs_dynevent *
tracefs_eprobe_alloc(const char *system, const char *event,
const char *target_system, const char *target_event, const char *fetchargs)
{
struct tracefs_dynevent *kp;
char *target;
if (!event || !target_system || !target_event) {
errno = EINVAL;
return NULL;
}
if (!system)
system = EPROBE_DEFAULT_GROUP;
if (asprintf(&target, "%s.%s", target_system, target_event) < 0)
return NULL;
kp = dynevent_alloc(TRACEFS_DYNEVENT_EPROBE, system, event, target, fetchargs);
free(target);
return kp;
}
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