X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fdestroy.cpp;fp=src%2Fbin%2Flttng%2Fcommands%2Fdestroy.cpp;h=78bbbaaad37e25a6e94648236860fe11a60252db;hp=0000000000000000000000000000000000000000;hb=48a4000561343808724f7cb5fa8c131877489ccd;hpb=81663f073dbfb4b61c06a0ceb8ca33c4fc41b1c5 diff --git a/src/bin/lttng/commands/destroy.cpp b/src/bin/lttng/commands/destroy.cpp new file mode 100644 index 000000000..78bbbaaad --- /dev/null +++ b/src/bin/lttng/commands/destroy.cpp @@ -0,0 +1,433 @@ +/* + * Copyright (C) 2011 David Goulet + * + * SPDX-License-Identifier: GPL-2.0-only + * + */ + +#define _LGPL_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../command.h" + +#include +#include +#include + +static char *opt_session_name; +static int opt_destroy_all; +static int opt_no_wait; + +#ifdef LTTNG_EMBED_HELP +static const char help_msg[] = +#include +; +#endif + +/* Mi writer */ +static struct mi_writer *writer; + +enum { + OPT_HELP = 1, + OPT_LIST_OPTIONS, +}; + +static struct poptOption long_options[] = { + /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ + {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, + {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0}, + {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, + {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0}, + {0, 0, 0, 0, 0, 0, 0} +}; + +/* + * destroy_session + * + * Unregister the provided session to the session daemon. On success, removes + * the default configuration. + */ +static int destroy_session(struct lttng_session *session) +{ + int ret; + char *session_name = NULL; + bool session_was_already_stopped; + enum lttng_error_code ret_code; + struct lttng_destruction_handle *handle = NULL; + enum lttng_destruction_handle_status status; + bool newline_needed = false, printed_destroy_msg = false; + enum lttng_rotation_state rotation_state; + char *stats_str = NULL; + + ret = lttng_stop_tracing_no_wait(session->name); + if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { + ERR("%s", lttng_strerror(ret)); + } + + session_was_already_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED; + if (!opt_no_wait) { + do { + ret = lttng_data_pending(session->name); + if (ret < 0) { + /* Return the data available call error. */ + goto error; + } + + /* + * Data sleep time before retrying (in usec). Don't + * sleep if the call returned value indicates + * availability. + */ + if (ret) { + if (!printed_destroy_msg) { + _MSG("Destroying session %s", + session->name); + newline_needed = true; + printed_destroy_msg = true; + fflush(stdout); + } + + usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US); + _MSG("."); + fflush(stdout); + } + } while (ret != 0); + } + + if (!session_was_already_stopped) { + /* + * Don't print the event and packet loss warnings since the user + * already saw them when stopping the trace. + */ + ret = get_session_stats_str(session->name, &stats_str); + if (ret < 0) { + goto error; + } + } + + ret_code = lttng_destroy_session_ext(session->name, &handle); + if (ret_code != LTTNG_OK) { + ret = -ret_code; + goto error; + } + + if (opt_no_wait) { + goto skip_wait_rotation; + } + + do { + status = lttng_destruction_handle_wait_for_completion( + handle, DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US / + USEC_PER_MSEC); + switch (status) { + case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT: + if (!printed_destroy_msg) { + _MSG("Destroying session %s", session->name); + newline_needed = true; + printed_destroy_msg = true; + } + _MSG("."); + fflush(stdout); + break; + case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED: + break; + default: + ERR("%sFailed to wait for the completion of the destruction of session \"%s\"", + newline_needed ? "\n" : "", + session->name); + newline_needed = false; + ret = -1; + goto error; + } + } while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT); + + status = lttng_destruction_handle_get_result(handle, &ret_code); + if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) { + ERR("%sFailed to get the result of session destruction", + newline_needed ? "\n" : ""); + ret = -1; + newline_needed = false; + goto error; + } + if (ret_code != LTTNG_OK) { + ret = -ret_code; + goto error; + } + + status = lttng_destruction_handle_get_rotation_state( + handle, &rotation_state); + if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) { + ERR("%sFailed to get rotation state from destruction handle", + newline_needed ? "\n" : ""); + newline_needed = false; + goto skip_wait_rotation; + } + + switch (rotation_state) { + case LTTNG_ROTATION_STATE_NO_ROTATION: + break; + case LTTNG_ROTATION_STATE_COMPLETED: + { + const struct lttng_trace_archive_location *location; + + status = lttng_destruction_handle_get_archive_location( + handle, &location); + if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) { + ret = print_trace_archive_location( + location, session->name); + if (ret) { + ERR("%sFailed to print the location of trace archive", + newline_needed ? "\n" : ""); + newline_needed = false; + goto skip_wait_rotation; + } + break; + } + /* fall-through. */ + } + default: + ERR("%sFailed to get the location of the rotation performed during the session's destruction", + newline_needed ? "\n" : ""); + newline_needed = false; + goto skip_wait_rotation; + } +skip_wait_rotation: + MSG("%sSession %s destroyed", newline_needed ? "\n" : "", + session->name); + newline_needed = false; + if (stats_str) { + MSG("%s", stats_str); + } + + session_name = get_session_name_quiet(); + if (session_name && !strncmp(session->name, session_name, NAME_MAX)) { + config_destroy_default(); + } + + if (lttng_opt_mi) { + ret = mi_lttng_session(writer, session, 0); + if (ret) { + ret = CMD_ERROR; + goto error; + } + } + + ret = CMD_SUCCESS; +error: + if (newline_needed) { + MSG(""); + } + lttng_destruction_handle_destroy(handle); + free(session_name); + free(stats_str); + return ret; +} + +/* + * destroy_all_sessions + * + * Call destroy_sessions for each registered sessions + */ +static int destroy_all_sessions(struct lttng_session *sessions, int count) +{ + int i; + bool error_occurred = false; + + LTTNG_ASSERT(count >= 0); + if (count == 0) { + MSG("No session found, nothing to do."); + } + + for (i = 0; i < count; i++) { + int ret = destroy_session(&sessions[i]); + + if (ret < 0) { + ERR("%s during the destruction of session \"%s\"", + lttng_strerror(ret), + sessions[i].name); + /* Continue to next session. */ + error_occurred = true; + } + } + + return error_occurred ? CMD_ERROR : CMD_SUCCESS; +} + +/* + * The 'destroy ' first level command + */ +int cmd_destroy(int argc, const char **argv) +{ + int opt; + int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1; + static poptContext pc; + char *session_name = NULL; + const char *leftover = NULL; + + struct lttng_session *sessions = NULL; + int count; + int found; + + pc = poptGetContext(NULL, argc, argv, long_options, 0); + poptReadDefaultConfig(pc, 0); + + while ((opt = poptGetNextOpt(pc)) != -1) { + switch (opt) { + case OPT_HELP: + SHOW_HELP(); + break; + case OPT_LIST_OPTIONS: + list_cmd_options(stdout, long_options); + break; + default: + ret = CMD_UNDEFINED; + break; + } + goto end; + } + + /* Mi preparation */ + if (lttng_opt_mi) { + writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); + if (!writer) { + ret = -LTTNG_ERR_NOMEM; + goto end; + } + + /* Open command element */ + ret = mi_lttng_writer_command_open(writer, + mi_lttng_element_command_destroy); + if (ret) { + ret = CMD_ERROR; + goto end; + } + + /* Open output element */ + ret = mi_lttng_writer_open_element(writer, + mi_lttng_element_command_output); + if (ret) { + ret = CMD_ERROR; + goto end; + } + + /* For validation and semantic purpose we open a sessions element */ + ret = mi_lttng_sessions_open(writer); + if (ret) { + ret = CMD_ERROR; + goto end; + } + } + + /* Recuperate all sessions for further operation */ + count = lttng_list_sessions(&sessions); + if (count < 0) { + ERR("%s", lttng_strerror(count)); + command_ret = CMD_ERROR; + success = 0; + goto mi_closing; + } + + /* Ignore session name in case all sessions are to be destroyed */ + if (opt_destroy_all) { + command_ret = destroy_all_sessions(sessions, count); + if (command_ret) { + success = 0; + } + } else { + opt_session_name = (char *) poptGetArg(pc); + + if (!opt_session_name) { + /* No session name specified, lookup default */ + session_name = get_session_name(); + if (session_name == NULL) { + command_ret = CMD_ERROR; + success = 0; + goto mi_closing; + } + } else { + session_name = opt_session_name; + } + + /* Find the corresponding lttng_session struct */ + found = 0; + for (i = 0; i < count; i++) { + if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { + found = 1; + command_ret = destroy_session(&sessions[i]); + if (command_ret) { + success = 0; + ERR("%s during the destruction of session \"%s\"", + lttng_strerror(command_ret), + sessions[i].name); + } + } + } + + if (!found) { + ERR("Session name %s not found", session_name); + command_ret = LTTNG_ERR_SESS_NOT_FOUND; + success = 0; + goto mi_closing; + } + } + + leftover = poptGetArg(pc); + if (leftover) { + ERR("Unknown argument: %s", leftover); + ret = CMD_ERROR; + success = 0; + goto mi_closing; + } + +mi_closing: + /* Mi closing */ + if (lttng_opt_mi) { + /* Close sessions and output element element */ + ret = mi_lttng_close_multi_element(writer, 2); + if (ret) { + ret = CMD_ERROR; + goto end; + } + + /* Success ? */ + ret = mi_lttng_writer_write_element_bool(writer, + mi_lttng_element_command_success, success); + if (ret) { + ret = CMD_ERROR; + goto end; + } + + /* Command element close */ + ret = mi_lttng_writer_command_close(writer); + if (ret) { + ret = CMD_ERROR; + goto end; + } + } +end: + /* Mi clean-up */ + if (writer && mi_lttng_writer_destroy(writer)) { + /* Preserve original error code */ + ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; + } + + if (opt_session_name == NULL) { + free(session_name); + } + + free(sessions); + + /* Overwrite ret if an error occurred during destroy_session/all */ + ret = command_ret ? command_ret : ret; + + poptFreeContext(pc); + return ret; +}