2 * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 * SPDX-License-Identifier: LGPL-2.1-only
8 #ifndef LTTNG_PAYLOAD_H
9 #define LTTNG_PAYLOAD_H
11 #include <common/dynamic-buffer.h>
12 #include <common/dynamic-array.h>
13 #include <common/fd-handle.h>
16 * An lttng_payload encompasses the 'data' (bytes) and any passed file
17 * descriptors as part of a message between liblttng-ctl and the session
20 struct lttng_payload
{
21 struct lttng_dynamic_buffer buffer
;
23 struct lttng_dynamic_pointer_array _fd_handles
;
27 * Initialize a payload. This performs no allocation and is meant
28 * to be used instead of zero-ing the payload structure.
31 void lttng_payload_init(struct lttng_payload
*payload
);
35 int lttng_payload_copy(const struct lttng_payload
*src_payload
,
36 struct lttng_payload
*dst_payload
);
38 /* Release any memory and references held by the payload. */
40 void lttng_payload_reset(struct lttng_payload
*payload
);
43 * Empty the contents of a payload, releasing all references held.
44 * This should be used to put a payload in a re-usable state.
46 * lttng_payload_reset must still be called on an lttng_payload to
47 * free all allocated memory.
50 void lttng_payload_clear(struct lttng_payload
*payload
);
53 * Add an fd to the payload.
54 * The payload acquires a reference to the fd_handle.
56 * @payload Payload instance
57 * @fd_handle File descriptor handle to add to the payload
59 * Returns 0 on success, -1 on allocation error.
62 int lttng_payload_push_fd_handle(struct lttng_payload
*payload
,
63 struct fd_handle
*fd_handle
);
65 #endif /* LTTNG_PAYLOAD_H */