| // 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; |
| } |
| |