+++ /dev/null
-/*
- * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- * Copyright (C) 2019 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <assert.h>
-#include <string.h>
-
-#include <lttng/lttng-error.h>
-#include <lttng/clear.h>
-#include <lttng/clear-handle.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/macros.h>
-#include <common/compat/poll.h>
-#include <common/dynamic-buffer.h>
-#include <common/buffer-view.h>
-#include <common/optional.h>
-
-#include "lttng-ctl-helper.h"
-
-enum communication_state {
- COMMUNICATION_STATE_RECEIVE_LTTNG_MSG,
- COMMUNICATION_STATE_RECEIVE_COMMAND_HEADER,
- COMMUNICATION_STATE_END,
- COMMUNICATION_STATE_ERROR,
-};
-
-struct lttng_clear_handle {
- LTTNG_OPTIONAL(enum lttng_error_code) clear_return_code;
- 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_clear_handle_destroy(struct lttng_clear_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);
- free(handle);
-}
-
-static
-struct lttng_clear_handle *lttng_clear_handle_create(int sessiond_socket)
-{
- int ret;
- struct lttng_clear_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_clear_handle_destroy(handle);
- return NULL;
-}
-
-static
-int handle_state_transition(struct lttng_clear_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->clear_return_code,
- (enum lttng_error_code) msg->ret_code);
- if (handle->clear_return_code.value != LTTNG_OK) {
- handle->communication.state = COMMUNICATION_STATE_END;
- break;
- } else if (msg->cmd_header_size != 0 || msg->data_size != 0) {
- handle->communication.state = COMMUNICATION_STATE_ERROR;
- ret = -1;
- break;
- }
-
- handle->communication.state = COMMUNICATION_STATE_END;
- handle->communication.bytes_left_to_receive = 0;
- LTTNG_OPTIONAL_SET(&handle->communication.data_size, 0);
- ret = lttng_dynamic_buffer_set_size(
- &handle->communication.buffer, 0);
- assert(!ret);
- 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_clear_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;
-}
-
-extern enum lttng_clear_handle_status
- lttng_clear_handle_wait_for_completion(
- struct lttng_clear_handle *handle, int timeout_ms)
-{
- int ret;
- enum lttng_clear_handle_status status;
- unsigned long time_left_ms = 0;
- const bool has_timeout = timeout_ms > 0;
- struct timespec initial_time;
-
- if (handle->communication.state == COMMUNICATION_STATE_ERROR) {
- status = LTTNG_CLEAR_HANDLE_STATUS_ERROR;
- goto end;
- } else if (handle->communication.state == COMMUNICATION_STATE_END) {
- status = LTTNG_CLEAR_HANDLE_STATUS_COMPLETED;
- goto end;
- }
- if (has_timeout) {
- ret = lttng_clock_gettime(CLOCK_MONOTONIC, &initial_time);
- if (ret) {
- status = LTTNG_CLEAR_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_CLEAR_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_CLEAR_HANDLE_STATUS_ERROR;
- goto end;
- }
- } else {
- handle->communication.state = COMMUNICATION_STATE_ERROR;
- status = LTTNG_CLEAR_HANDLE_STATUS_ERROR;
- goto end;
- }
- if (!has_timeout) {
- continue;
- }
-
- ret = lttng_clock_gettime(CLOCK_MONOTONIC, ¤t_time);
- if (ret) {
- status = LTTNG_CLEAR_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_CLEAR_HANDLE_STATUS_ERROR;
- goto end;
- }
- DBG("%lums elapsed while waiting for session clear 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_CLEAR_HANDLE_STATUS_COMPLETED :
- LTTNG_CLEAR_HANDLE_STATUS_TIMEOUT;
-end:
- return status;
-}
-
-extern enum lttng_clear_handle_status
- lttng_clear_handle_get_result(
- const struct lttng_clear_handle *handle,
- enum lttng_error_code *result)
-{
- enum lttng_clear_handle_status status =
- LTTNG_CLEAR_HANDLE_STATUS_OK;
-
- if (!handle->clear_return_code.is_set) {
- status = LTTNG_CLEAR_HANDLE_STATUS_INVALID;
- goto end;
- }
- *result = handle->clear_return_code.value;
-end:
- return status;
-}
-
-/*
- * Clear the session
- */
-enum lttng_error_code lttng_clear_session(const char *session_name,
- struct lttng_clear_handle **_handle)
-{
- enum lttng_error_code ret_code = LTTNG_OK;
- struct lttng_clear_handle *handle = NULL;
- struct lttcomm_session_msg lsm = {
- .cmd_type = LTTNG_CLEAR_SESSION,
- };
- int sessiond_socket = -1;
- ssize_t comm_ret;
- int ret;
-
- if (session_name == NULL) {
- 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_clear_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;
-
-error:
- /* Transfer the handle to the caller. */
- if (_handle) {
- *_handle = handle;
- handle = NULL;
- }
- if (sessiond_socket >= 0) {
- ret = close(sessiond_socket);
- if (ret < 0) {
- PERROR("Failed to close the LTTng session daemon connection socket");
- }
- }
- if (handle) {
- lttng_clear_handle_destroy(handle);
- }
- return ret_code;
-}
projects / lttng-tools.git / blobdiff