X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fclear.c;fp=src%2Fbin%2Flttng%2Fcommands%2Fclear.c;h=a0a44ba69772bab1b11790085b017fb8d34f3ec2;hp=0000000000000000000000000000000000000000;hb=7886d6703b080ef163feb3a345fa69e21599821b;hpb=818ea544c74e89a68bcad32744a465bfdb648569 diff --git a/src/bin/lttng/commands/clear.c b/src/bin/lttng/commands/clear.c new file mode 100644 index 000000000..a0a44ba69 --- /dev/null +++ b/src/bin/lttng/commands/clear.c @@ -0,0 +1,285 @@ +/* + * Copyright (C) 2019 - Jonathan Rajotte-Julien + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#define _LGPL_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../command.h" + +#include +#include +#include + +static char *opt_session_name; +static int opt_clear_all; + +#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_clear_all, 1, 0, 0}, + {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, + {0, 0, 0, 0, 0, 0, 0} +}; + +/* + * clear session + * + */ +static int clear_session(struct lttng_session *session) +{ + int ret; + char *session_name = NULL; + + ret = lttng_clear_session(session->name); + if (ret < 0) { + ERR("%s", lttng_strerror(ret)); + goto error; + } + + MSG("Session %s cleared", session->name); + + if (lttng_opt_mi) { + ret = mi_lttng_session(writer, session, 0); + if (ret) { + ret = CMD_ERROR; + goto error; + } + } + + ret = CMD_SUCCESS; +error: + free(session_name); + return ret; +} + +/* + * clear all sessions + * + * Call clear_session for each registered sessions + */ +static int clear_all_sessions(struct lttng_session *sessions, int count) +{ + int i, ret = CMD_SUCCESS; + + if (count == 0) { + MSG("No session found, nothing to do."); + } else if (count < 0) { + ERR("%s", lttng_strerror(ret)); + goto error; + } + + for (i = 0; i < count; i++) { + ret = clear_session(&sessions[i]); + if (ret < 0) { + goto error; + } + } +error: + return ret; +} + +/* + * The 'clear ' first level command + */ +int cmd_clear(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; + 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_clear); + 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; + } + } + + if (!opt_clear_all) { + 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; + } + } else { + session_name = NULL; + } + + leftover = poptGetArg(pc); + if (leftover) { + ERR("Unknown argument: %s", leftover); + ret = CMD_ERROR; + success = 0; + goto mi_closing; + } + + /* 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 cleaned */ + if (opt_clear_all) { + command_ret = clear_all_sessions(sessions, count); + if (command_ret) { + success = 0; + } + } else { + /* 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 = clear_session(&sessions[i]); + if (command_ret) { + success = 0; + } + } + } + + if (!found) { + ERR("Session name %s not found", session_name); + command_ret = LTTNG_ERR_SESS_NOT_FOUND; + 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); + } + + /* Overwrite ret if an error occurred during clear_session/all */ + ret = command_ret ? command_ret : ret; + + poptFreeContext(pc); + return ret; +}