[lttng-tools.git] / src / lib / lttng-ctl / destruction-handle.c

/*
 * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#include <lttng/destruction-handle.h>
#include <lttng/rotation.h>

#include <common/optional.h>
#include <common/compat/poll.h>
#include <common/compat/time.h>
#include <common/macros.h>
#include <common/compat/poll.h>
#include <common/dynamic-buffer.h>
#include <common/buffer-view.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <lttng/location-internal.h>
#include "lttng-ctl-helper.h"

#include <stdbool.h>

enum communication_state {
	COMMUNICATION_STATE_RECEIVE_LTTNG_MSG,
	COMMUNICATION_STATE_RECEIVE_COMMAND_HEADER,
	COMMUNICATION_STATE_RECEIVE_PAYLOAD,
	COMMUNICATION_STATE_END,
	COMMUNICATION_STATE_ERROR,
};

struct lttng_destruction_handle {
	LTTNG_OPTIONAL(enum lttng_error_code) destruction_return_code;
	LTTNG_OPTIONAL(enum lttng_rotation_state) rotation_state;
	struct lttng_trace_archive_location *location;
	struct {
		int socket;
		struct lttng_poll_event events;
		size_t bytes_left_to_receive;
		enum communication_state state;
		struct lttng_dynamic_buffer buffer;
		LTTNG_OPTIONAL(size_t) data_size;
	} communication;
};

void lttng_destruction_handle_destroy(struct lttng_destruction_handle *handle)
{
	int ret;

	if (!handle) {
		return;
	}

	if (handle->communication.socket >= 0) {
		ret = close(handle->communication.socket);
		if (ret) {
			PERROR("Failed to close lttng-sessiond command socket");
		}
	}
	lttng_poll_clean(&handle->communication.events);
	lttng_dynamic_buffer_reset(&handle->communication.buffer);
	lttng_trace_archive_location_put(handle->location);
	free(handle);
}

static
struct lttng_destruction_handle *lttng_destruction_handle_create(
		int sessiond_socket)
{
	int ret;
	struct lttng_destruction_handle *handle = zmalloc(sizeof(*handle));

	if (!handle) {
		goto end;
	}
	lttng_dynamic_buffer_init(&handle->communication.buffer);
	handle->communication.socket = sessiond_socket;
	ret = lttng_poll_create(&handle->communication.events, 1, 0);
	if (ret) {
		goto error;
	}

	ret = lttng_poll_add(&handle->communication.events, sessiond_socket,
			LPOLLIN | LPOLLHUP | LPOLLRDHUP | LPOLLERR);
	if (ret) {
		goto error;
	}

	handle->communication.bytes_left_to_receive =
			sizeof(struct lttcomm_lttng_msg);
	handle->communication.state = COMMUNICATION_STATE_RECEIVE_LTTNG_MSG;
end:
	return handle;
error:
	lttng_destruction_handle_destroy(handle);
	return NULL;
}

static
int handle_state_transition(struct lttng_destruction_handle *handle)
{
	int ret = 0;

	assert(handle->communication.bytes_left_to_receive == 0);

	switch (handle->communication.state) {
	case COMMUNICATION_STATE_RECEIVE_LTTNG_MSG:
	{
		const struct lttcomm_lttng_msg *msg =
				(typeof(msg)) handle->communication.buffer.data;

		LTTNG_OPTIONAL_SET(&handle->destruction_return_code,
				(enum lttng_error_code) msg->ret_code);
		if (handle->destruction_return_code.value != LTTNG_OK) {
			handle->communication.state = COMMUNICATION_STATE_END;
			break;
		} else if (msg->cmd_header_size != sizeof(struct lttcomm_session_destroy_command_header) ||
				msg->data_size > DEFAULT_MAX_TRACE_ARCHIVE_LOCATION_PAYLOAD_SIZE) {
			handle->communication.state = COMMUNICATION_STATE_ERROR;
			ret = -1;
			break;
		}

		handle->communication.state =
				COMMUNICATION_STATE_RECEIVE_COMMAND_HEADER;
		handle->communication.bytes_left_to_receive =
				msg->cmd_header_size;
		LTTNG_OPTIONAL_SET(&handle->communication.data_size,
				msg->data_size);
		ret = lttng_dynamic_buffer_set_size(
				&handle->communication.buffer, 0);
		assert(!ret);
		break;
	}
	case COMMUNICATION_STATE_RECEIVE_COMMAND_HEADER:
	{
		const struct lttcomm_session_destroy_command_header *hdr =
				(typeof(hdr)) handle->communication.buffer.data;

		LTTNG_OPTIONAL_SET(&handle->rotation_state,
				(enum lttng_rotation_state) hdr->rotation_state);
		switch (handle->rotation_state.value) {
		case LTTNG_ROTATION_STATE_COMPLETED:
			handle->communication.state =
					COMMUNICATION_STATE_RECEIVE_PAYLOAD;
			handle->communication.bytes_left_to_receive =
					LTTNG_OPTIONAL_GET(handle->communication.data_size);
			break;
		case LTTNG_ROTATION_STATE_ERROR:
		case LTTNG_ROTATION_STATE_NO_ROTATION:
			handle->communication.state = COMMUNICATION_STATE_END;
			break;
		default:
			handle->communication.state = COMMUNICATION_STATE_ERROR;
			ret = -1;
			break;
		}
		break;
	}
	case COMMUNICATION_STATE_RECEIVE_PAYLOAD:
	{
		ssize_t location_ret;
		struct lttng_trace_archive_location *location;
		const struct lttng_buffer_view view =
				lttng_buffer_view_from_dynamic_buffer(
					&handle->communication.buffer, 0, -1);

		location_ret = lttng_trace_archive_location_create_from_buffer(
				&view, &location);
		if (location_ret < 0) {
			ERR("Failed to deserialize trace archive location");
			handle->communication.state = COMMUNICATION_STATE_ERROR;
			ret = -1;
			break;
		} else {
			/* Ownership is transferred to the destruction handle. */
			handle->location = location;
			handle->communication.state = COMMUNICATION_STATE_END;
		}
		break;
	}
	default:
		abort();
	}

	/* Clear reception buffer on state transition. */
	if (lttng_dynamic_buffer_set_size(&handle->communication.buffer, 0)) {
		abort();
	}
	return ret;
}

static
int handle_incoming_data(struct lttng_destruction_handle *handle)
{
	int ret;
	ssize_t comm_ret;
	const size_t original_buffer_size = handle->communication.buffer.size;

	/* Reserve space for reception. */
	ret = lttng_dynamic_buffer_set_size(&handle->communication.buffer,
			original_buffer_size + handle->communication.bytes_left_to_receive);
	if (ret) {
		goto end;
	}

	comm_ret = lttcomm_recv_unix_sock(handle->communication.socket,
			handle->communication.buffer.data + original_buffer_size,
			handle->communication.bytes_left_to_receive);
	if (comm_ret <= 0) {
		ret = -1;
		goto end;
	}

	handle->communication.bytes_left_to_receive -= comm_ret;
	if (handle->communication.bytes_left_to_receive == 0) {
		ret = handle_state_transition(handle);
	} else {
		ret = lttng_dynamic_buffer_set_size(
				&handle->communication.buffer,
				original_buffer_size + comm_ret);
	}
end:
	return ret;
}

enum lttng_destruction_handle_status
lttng_destruction_handle_wait_for_completion(
		struct lttng_destruction_handle *handle, int timeout_ms)
{
	enum lttng_destruction_handle_status status;
	unsigned long time_left_ms = 0;
	const bool has_timeout = timeout_ms > 0;
	struct timespec initial_time;

	if (!handle) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
		goto end;
	}

	if (handle->communication.state == COMMUNICATION_STATE_ERROR) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
		goto end;
	} else if (handle->communication.state == COMMUNICATION_STATE_END) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED;
		goto end;
	}
	if (has_timeout) {
		int ret = lttng_clock_gettime(CLOCK_MONOTONIC, &initial_time);
		if (ret) {
			status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
			goto end;
		}
		time_left_ms = (unsigned long) timeout_ms;
	}

	while (handle->communication.state != COMMUNICATION_STATE_END &&
			(time_left_ms || !has_timeout)) {
		int ret;
		uint32_t revents;
		struct timespec current_time, diff;
		unsigned long diff_ms;

		ret = lttng_poll_wait(&handle->communication.events,
				has_timeout ? time_left_ms : -1);
		if (ret == 0) {
			/* timeout */
			break;
		} else if (ret < 0) {
			status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
			goto end;
		}

		/* The sessiond connection socket is the only monitored fd. */
		revents = LTTNG_POLL_GETEV(&handle->communication.events, 0);
		if (revents & LPOLLIN) {
			ret = handle_incoming_data(handle);
			if (ret) {
				handle->communication.state =
						COMMUNICATION_STATE_ERROR;
				status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
				goto end;
			}
		} else {
			handle->communication.state = COMMUNICATION_STATE_ERROR;
			status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
			goto end;
		}
		if (!has_timeout) {
			continue;
		}

		ret = lttng_clock_gettime(CLOCK_MONOTONIC, &current_time);
		if (ret) {
			status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
			goto end;
		}
		diff = timespec_abs_diff(initial_time, current_time);
		ret = timespec_to_ms(diff, &diff_ms);
		if (ret) {
			ERR("Failed to compute elapsed time while waiting for completion");
			status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
			goto end;
		}
		DBG("%lums elapsed while waiting for session destruction completion",
				diff_ms);
		diff_ms = max_t(unsigned long, diff_ms, 1);
		diff_ms = min_t(unsigned long, diff_ms, time_left_ms);
		time_left_ms -= diff_ms;
	}

	status = handle->communication.state == COMMUNICATION_STATE_END ?
			LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED :
			LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT;
end:
	return status;
}

enum lttng_destruction_handle_status
lttng_destruction_handle_get_rotation_state(
		const struct lttng_destruction_handle *handle,
		enum lttng_rotation_state *rotation_state)
{
	enum lttng_destruction_handle_status status =
			LTTNG_DESTRUCTION_HANDLE_STATUS_OK;

	if (!handle || !rotation_state) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
		goto end;
	}

	if (!handle->rotation_state.is_set) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
		goto end;
	}
	*rotation_state = handle->rotation_state.value;
end:
	return status;
}

enum lttng_destruction_handle_status
lttng_destruction_handle_get_archive_location(
		const struct lttng_destruction_handle *handle,
		const struct lttng_trace_archive_location **location)
{
	enum lttng_destruction_handle_status status =
			LTTNG_DESTRUCTION_HANDLE_STATUS_OK;

	if (!handle || !location) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
		goto end;
	}

	if (!handle->location) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
		goto end;
	}
	*location = handle->location;
end:
	return status;
}

enum lttng_destruction_handle_status
lttng_destruction_handle_get_result(
		const struct lttng_destruction_handle *handle,
		enum lttng_error_code *result)
{
	enum lttng_destruction_handle_status status =
			LTTNG_DESTRUCTION_HANDLE_STATUS_OK;

	if (!handle || !result) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
		goto end;
	}

	if (!handle->destruction_return_code.is_set) {
		status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
		goto end;
	}
	*result = handle->destruction_return_code.value;
end:
	return status;
}

enum lttng_error_code lttng_destroy_session_ext(const char *session_name,
		struct lttng_destruction_handle **_handle)
{
	int ret;
	ssize_t comm_ret;
	enum lttng_error_code ret_code = LTTNG_OK;
	struct lttcomm_session_msg lsm = {
		.cmd_type = LTTNG_DESTROY_SESSION,
	};
	int sessiond_socket = -1;
	struct lttng_destruction_handle *handle = NULL;

	if (!session_name) {
		ret_code = LTTNG_ERR_INVALID;
		goto error;
	}

	ret = lttng_strncpy(lsm.session.name, session_name,
			sizeof(lsm.session.name));
	if (ret) {
		ret_code = LTTNG_ERR_INVALID;
		goto error;
	}

	ret = connect_sessiond();
	if (ret < 0) {
		ret_code = LTTNG_ERR_NO_SESSIOND;
		goto error;
	} else {
		sessiond_socket = ret;
	}

	handle = lttng_destruction_handle_create(sessiond_socket);
	if (!handle) {
		ret_code = LTTNG_ERR_NOMEM;
		goto error;
	}

	comm_ret = lttcomm_send_creds_unix_sock(sessiond_socket, &lsm, sizeof(lsm));
	if (comm_ret < 0) {
		ret_code = LTTNG_ERR_FATAL;
		goto error;
	}
	sessiond_socket = -1;

	/* Transfer the handle to the caller. */
	if (_handle) {
		*_handle = handle;
		handle = NULL;
	}
error:
	if (sessiond_socket >= 0) {
		ret = close(sessiond_socket);
		if (ret < 0) {
			PERROR("Failed to close the LTTng session daemon connection socket");
		}
	}
	if (handle) {
		lttng_destruction_handle_destroy(handle);
	}
	return ret_code;
}
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
	3	*
	4	* SPDX-License-Identifier: LGPL-2.1-only
	5	*
	6	*/
	7
	8	#include <lttng/destruction-handle.h>
	9	#include <lttng/rotation.h>
	10
	11	#include <common/optional.h>
	12	#include <common/compat/poll.h>
	13	#include <common/compat/time.h>
	14	#include <common/macros.h>
	15	#include <common/compat/poll.h>
	16	#include <common/dynamic-buffer.h>
	17	#include <common/buffer-view.h>
	18	#include <common/sessiond-comm/sessiond-comm.h>
	19	#include <lttng/location-internal.h>
	20	#include "lttng-ctl-helper.h"
	21
	22	#include <stdbool.h>
	23
	24	enum communication_state {
	25	COMMUNICATION_STATE_RECEIVE_LTTNG_MSG,
	26	COMMUNICATION_STATE_RECEIVE_COMMAND_HEADER,
	27	COMMUNICATION_STATE_RECEIVE_PAYLOAD,
	28	COMMUNICATION_STATE_END,
	29	COMMUNICATION_STATE_ERROR,
	30	};
	31
	32	struct lttng_destruction_handle {
	33	LTTNG_OPTIONAL(enum lttng_error_code) destruction_return_code;
	34	LTTNG_OPTIONAL(enum lttng_rotation_state) rotation_state;
	35	struct lttng_trace_archive_location *location;
	36	struct {
	37	int socket;
	38	struct lttng_poll_event events;
	39	size_t bytes_left_to_receive;
	40	enum communication_state state;
	41	struct lttng_dynamic_buffer buffer;
	42	LTTNG_OPTIONAL(size_t) data_size;
	43	} communication;
	44	};
	45
	46	void lttng_destruction_handle_destroy(struct lttng_destruction_handle *handle)
	47	{
	48	int ret;
	49
	50	if (!handle) {
	51	return;
	52	}
	53
	54	if (handle->communication.socket >= 0) {
	55	ret = close(handle->communication.socket);
	56	if (ret) {
	57	PERROR("Failed to close lttng-sessiond command socket");
	58	}
	59	}
	60	lttng_poll_clean(&handle->communication.events);
	61	lttng_dynamic_buffer_reset(&handle->communication.buffer);
	62	lttng_trace_archive_location_put(handle->location);
	63	free(handle);
	64	}
	65
	66	static
	67	struct lttng_destruction_handle *lttng_destruction_handle_create(
	68	int sessiond_socket)
	69	{
	70	int ret;
	71	struct lttng_destruction_handle handle = zmalloc(sizeof(handle));
	72
	73	if (!handle) {
	74	goto end;
	75	}
	76	lttng_dynamic_buffer_init(&handle->communication.buffer);
	77	handle->communication.socket = sessiond_socket;
	78	ret = lttng_poll_create(&handle->communication.events, 1, 0);
	79	if (ret) {
	80	goto error;
	81	}
	82
	83	ret = lttng_poll_add(&handle->communication.events, sessiond_socket,
	84	LPOLLIN \| LPOLLHUP \| LPOLLRDHUP \| LPOLLERR);
	85	if (ret) {
	86	goto error;
	87	}
	88
	89	handle->communication.bytes_left_to_receive =
	90	sizeof(struct lttcomm_lttng_msg);
	91	handle->communication.state = COMMUNICATION_STATE_RECEIVE_LTTNG_MSG;
	92	end:
	93	return handle;
	94	error:
	95	lttng_destruction_handle_destroy(handle);
	96	return NULL;
	97	}
	98
	99	static
	100	int handle_state_transition(struct lttng_destruction_handle *handle)
	101	{
	102	int ret = 0;
	103
	104	assert(handle->communication.bytes_left_to_receive == 0);
	105
	106	switch (handle->communication.state) {
	107	case COMMUNICATION_STATE_RECEIVE_LTTNG_MSG:
	108	{
	109	const struct lttcomm_lttng_msg *msg =
	110	(typeof(msg)) handle->communication.buffer.data;
	111
	112	LTTNG_OPTIONAL_SET(&handle->destruction_return_code,
	113	(enum lttng_error_code) msg->ret_code);
	114	if (handle->destruction_return_code.value != LTTNG_OK) {
	115	handle->communication.state = COMMUNICATION_STATE_END;
	116	break;
	117	} else if (msg->cmd_header_size != sizeof(struct lttcomm_session_destroy_command_header) \|\|
	118	msg->data_size > DEFAULT_MAX_TRACE_ARCHIVE_LOCATION_PAYLOAD_SIZE) {
	119	handle->communication.state = COMMUNICATION_STATE_ERROR;
	120	ret = -1;
	121	break;
	122	}
	123
	124	handle->communication.state =
	125	COMMUNICATION_STATE_RECEIVE_COMMAND_HEADER;
	126	handle->communication.bytes_left_to_receive =
	127	msg->cmd_header_size;
	128	LTTNG_OPTIONAL_SET(&handle->communication.data_size,
	129	msg->data_size);
	130	ret = lttng_dynamic_buffer_set_size(
	131	&handle->communication.buffer, 0);
	132	assert(!ret);
	133	break;
	134	}
	135	case COMMUNICATION_STATE_RECEIVE_COMMAND_HEADER:
	136	{
	137	const struct lttcomm_session_destroy_command_header *hdr =
	138	(typeof(hdr)) handle->communication.buffer.data;
	139
	140	LTTNG_OPTIONAL_SET(&handle->rotation_state,
	141	(enum lttng_rotation_state) hdr->rotation_state);
	142	switch (handle->rotation_state.value) {
	143	case LTTNG_ROTATION_STATE_COMPLETED:
	144	handle->communication.state =
	145	COMMUNICATION_STATE_RECEIVE_PAYLOAD;
	146	handle->communication.bytes_left_to_receive =
	147	LTTNG_OPTIONAL_GET(handle->communication.data_size);
	148	break;
	149	case LTTNG_ROTATION_STATE_ERROR:
	150	case LTTNG_ROTATION_STATE_NO_ROTATION:
	151	handle->communication.state = COMMUNICATION_STATE_END;
	152	break;
	153	default:
	154	handle->communication.state = COMMUNICATION_STATE_ERROR;
	155	ret = -1;
	156	break;
	157	}
	158	break;
	159	}
	160	case COMMUNICATION_STATE_RECEIVE_PAYLOAD:
	161	{
	162	ssize_t location_ret;
	163	struct lttng_trace_archive_location *location;
	164	const struct lttng_buffer_view view =
	165	lttng_buffer_view_from_dynamic_buffer(
	166	&handle->communication.buffer, 0, -1);
	167
	168	location_ret = lttng_trace_archive_location_create_from_buffer(
	169	&view, &location);
	170	if (location_ret < 0) {
	171	ERR("Failed to deserialize trace archive location");
	172	handle->communication.state = COMMUNICATION_STATE_ERROR;
	173	ret = -1;
	174	break;
	175	} else {
	176	/* Ownership is transferred to the destruction handle. */
	177	handle->location = location;
	178	handle->communication.state = COMMUNICATION_STATE_END;
	179	}
	180	break;
	181	}
	182	default:
	183	abort();
	184	}
	185
	186	/* Clear reception buffer on state transition. */
	187	if (lttng_dynamic_buffer_set_size(&handle->communication.buffer, 0)) {
	188	abort();
	189	}
	190	return ret;
	191	}
	192
	193	static
	194	int handle_incoming_data(struct lttng_destruction_handle *handle)
	195	{
	196	int ret;
	197	ssize_t comm_ret;
	198	const size_t original_buffer_size = handle->communication.buffer.size;
	199
	200	/* Reserve space for reception. */
	201	ret = lttng_dynamic_buffer_set_size(&handle->communication.buffer,
	202	original_buffer_size + handle->communication.bytes_left_to_receive);
	203	if (ret) {
	204	goto end;
	205	}
	206
	207	comm_ret = lttcomm_recv_unix_sock(handle->communication.socket,
	208	handle->communication.buffer.data + original_buffer_size,
	209	handle->communication.bytes_left_to_receive);
	210	if (comm_ret <= 0) {
	211	ret = -1;
	212	goto end;
	213	}
	214
	215	handle->communication.bytes_left_to_receive -= comm_ret;
	216	if (handle->communication.bytes_left_to_receive == 0) {
	217	ret = handle_state_transition(handle);
	218	} else {
	219	ret = lttng_dynamic_buffer_set_size(
	220	&handle->communication.buffer,
	221	original_buffer_size + comm_ret);
	222	}
	223	end:
	224	return ret;
	225	}
	226
	227	enum lttng_destruction_handle_status
	228	lttng_destruction_handle_wait_for_completion(
	229	struct lttng_destruction_handle *handle, int timeout_ms)
	230	{
	231	enum lttng_destruction_handle_status status;
	232	unsigned long time_left_ms = 0;
	233	const bool has_timeout = timeout_ms > 0;
	234	struct timespec initial_time;
	235
	236	if (!handle) {
	237	status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
	238	goto end;
	239	}
	240
	241	if (handle->communication.state == COMMUNICATION_STATE_ERROR) {
	242	status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
	243	goto end;
	244	} else if (handle->communication.state == COMMUNICATION_STATE_END) {
	245	status = LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED;
	246	goto end;
	247	}
	248	if (has_timeout) {
	249	int ret = lttng_clock_gettime(CLOCK_MONOTONIC, &initial_time);
	250	if (ret) {
	251	status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
	252	goto end;
	253	}
	254	time_left_ms = (unsigned long) timeout_ms;
	255	}
	256
	257	while (handle->communication.state != COMMUNICATION_STATE_END &&
	258	(time_left_ms \|\| !has_timeout)) {
	259	int ret;
	260	uint32_t revents;
	261	struct timespec current_time, diff;
	262	unsigned long diff_ms;
	263
	264	ret = lttng_poll_wait(&handle->communication.events,
	265	has_timeout ? time_left_ms : -1);
	266	if (ret == 0) {
	267	/* timeout */
	268	break;
	269	} else if (ret < 0) {
	270	status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
	271	goto end;
	272	}
	273
	274	/* The sessiond connection socket is the only monitored fd. */
	275	revents = LTTNG_POLL_GETEV(&handle->communication.events, 0);
	276	if (revents & LPOLLIN) {
	277	ret = handle_incoming_data(handle);
	278	if (ret) {
	279	handle->communication.state =
	280	COMMUNICATION_STATE_ERROR;
	281	status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
	282	goto end;
	283	}
	284	} else {
	285	handle->communication.state = COMMUNICATION_STATE_ERROR;
	286	status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
	287	goto end;
	288	}
	289	if (!has_timeout) {
	290	continue;
	291	}
	292
	293	ret = lttng_clock_gettime(CLOCK_MONOTONIC, &current_time);
	294	if (ret) {
	295	status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
	296	goto end;
	297	}
	298	diff = timespec_abs_diff(initial_time, current_time);
	299	ret = timespec_to_ms(diff, &diff_ms);
	300	if (ret) {
	301	ERR("Failed to compute elapsed time while waiting for completion");
	302	status = LTTNG_DESTRUCTION_HANDLE_STATUS_ERROR;
	303	goto end;
	304	}
	305	DBG("%lums elapsed while waiting for session destruction completion",
	306	diff_ms);
	307	diff_ms = max_t(unsigned long, diff_ms, 1);
	308	diff_ms = min_t(unsigned long, diff_ms, time_left_ms);
	309	time_left_ms -= diff_ms;
	310	}
	311
	312	status = handle->communication.state == COMMUNICATION_STATE_END ?
	313	LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED :
	314	LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT;
	315	end:
	316	return status;
	317	}
	318
	319	enum lttng_destruction_handle_status
	320	lttng_destruction_handle_get_rotation_state(
	321	const struct lttng_destruction_handle *handle,
	322	enum lttng_rotation_state *rotation_state)
	323	{
	324	enum lttng_destruction_handle_status status =
	325	LTTNG_DESTRUCTION_HANDLE_STATUS_OK;
	326
	327	if (!handle \|\| !rotation_state) {
	328	status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
	329	goto end;
	330	}
	331
	332	if (!handle->rotation_state.is_set) {
	333	status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
	334	goto end;
	335	}
	336	*rotation_state = handle->rotation_state.value;
	337	end:
	338	return status;
	339	}
	340
	341	enum lttng_destruction_handle_status
	342	lttng_destruction_handle_get_archive_location(
	343	const struct lttng_destruction_handle *handle,
	344	const struct lttng_trace_archive_location **location)
	345	{
	346	enum lttng_destruction_handle_status status =
	347	LTTNG_DESTRUCTION_HANDLE_STATUS_OK;
	348
	349	if (!handle \|\| !location) {
	350	status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
	351	goto end;
	352	}
	353
	354	if (!handle->location) {
	355	status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
	356	goto end;
	357	}
	358	*location = handle->location;
	359	end:
	360	return status;
	361	}
	362
	363	enum lttng_destruction_handle_status
	364	lttng_destruction_handle_get_result(
	365	const struct lttng_destruction_handle *handle,
	366	enum lttng_error_code *result)
	367	{
	368	enum lttng_destruction_handle_status status =
	369	LTTNG_DESTRUCTION_HANDLE_STATUS_OK;
	370
	371	if (!handle \|\| !result) {
	372	status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
	373	goto end;
	374	}
	375
	376	if (!handle->destruction_return_code.is_set) {
	377	status = LTTNG_DESTRUCTION_HANDLE_STATUS_INVALID;
	378	goto end;
	379	}
	380	*result = handle->destruction_return_code.value;
	381	end:
	382	return status;
	383	}
	384
	385	enum lttng_error_code lttng_destroy_session_ext(const char *session_name,
	386	struct lttng_destruction_handle **_handle)
	387	{
	388	int ret;
	389	ssize_t comm_ret;
	390	enum lttng_error_code ret_code = LTTNG_OK;
	391	struct lttcomm_session_msg lsm = {
	392	.cmd_type = LTTNG_DESTROY_SESSION,
	393	};
	394	int sessiond_socket = -1;
	395	struct lttng_destruction_handle *handle = NULL;
	396
	397	if (!session_name) {
	398	ret_code = LTTNG_ERR_INVALID;
	399	goto error;
	400	}
	401
	402	ret = lttng_strncpy(lsm.session.name, session_name,
	403	sizeof(lsm.session.name));
	404	if (ret) {
	405	ret_code = LTTNG_ERR_INVALID;
	406	goto error;
	407	}
	408
	409	ret = connect_sessiond();
	410	if (ret < 0) {
	411	ret_code = LTTNG_ERR_NO_SESSIOND;
	412	goto error;
	413	} else {
	414	sessiond_socket = ret;
	415	}
	416
	417	handle = lttng_destruction_handle_create(sessiond_socket);
	418	if (!handle) {
	419	ret_code = LTTNG_ERR_NOMEM;
	420	goto error;
	421	}
	422
	423	comm_ret = lttcomm_send_creds_unix_sock(sessiond_socket, &lsm, sizeof(lsm));
	424	if (comm_ret < 0) {
	425	ret_code = LTTNG_ERR_FATAL;
	426	goto error;
	427	}
	428	sessiond_socket = -1;
	429
	430	/* Transfer the handle to the caller. */
	431	if (_handle) {
	432	*_handle = handle;
	433	handle = NULL;
	434	}
	435	error:
	436	if (sessiond_socket >= 0) {
	437	ret = close(sessiond_socket);
	438	if (ret < 0) {
	439	PERROR("Failed to close the LTTng session daemon connection socket");
	440	}
	441	}
	442	if (handle) {
	443	lttng_destruction_handle_destroy(handle);
	444	}
	445	return ret_code;
	446	}