| 1 | /* |
| 2 | * Copyright (C) 2011 EfficiOS Inc. |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #define _LGPL_SOURCE |
| 9 | #include "../command.hpp" |
| 10 | |
| 11 | #include <common/mi-lttng.hpp> |
| 12 | |
| 13 | #include <popt.h> |
| 14 | #include <stdio.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <string.h> |
| 17 | #include <sys/stat.h> |
| 18 | #include <sys/types.h> |
| 19 | #include <unistd.h> |
| 20 | |
| 21 | #ifdef LTTNG_EMBED_HELP |
| 22 | static const char help_msg[] = |
| 23 | #include <lttng-set-session.1.h> |
| 24 | ; |
| 25 | #endif |
| 26 | |
| 27 | enum { |
| 28 | OPT_HELP = 1, |
| 29 | OPT_LIST_OPTIONS, |
| 30 | }; |
| 31 | |
| 32 | static struct mi_writer *writer; |
| 33 | |
| 34 | static struct poptOption long_options[] = { |
| 35 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 36 | { "help", 'h', POPT_ARG_NONE, nullptr, OPT_HELP, nullptr, nullptr }, |
| 37 | { "list-options", 0, POPT_ARG_NONE, nullptr, OPT_LIST_OPTIONS, nullptr, nullptr }, |
| 38 | { nullptr, 0, 0, nullptr, 0, nullptr, nullptr } |
| 39 | }; |
| 40 | |
| 41 | /* |
| 42 | * Print the necessary mi for a session and name. |
| 43 | */ |
| 44 | static int mi_print(const char *session_name) |
| 45 | { |
| 46 | int ret; |
| 47 | |
| 48 | LTTNG_ASSERT(writer); |
| 49 | LTTNG_ASSERT(session_name); |
| 50 | |
| 51 | /* |
| 52 | * Open a sessions element |
| 53 | * This is purely for validation purpose |
| 54 | */ |
| 55 | ret = mi_lttng_sessions_open(writer); |
| 56 | if (ret) { |
| 57 | goto end; |
| 58 | } |
| 59 | |
| 60 | /* Open a session element */ |
| 61 | ret = mi_lttng_writer_open_element(writer, config_element_session); |
| 62 | if (ret) { |
| 63 | goto end; |
| 64 | } |
| 65 | |
| 66 | /* Session name */ |
| 67 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, session_name); |
| 68 | if (ret) { |
| 69 | goto end; |
| 70 | } |
| 71 | |
| 72 | /* Close session and sessions element */ |
| 73 | ret = mi_lttng_close_multi_element(writer, 2); |
| 74 | if (ret) { |
| 75 | goto end; |
| 76 | } |
| 77 | end: |
| 78 | return ret; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * set_session |
| 83 | */ |
| 84 | static int set_session(const char *session_name) |
| 85 | { |
| 86 | int ret = CMD_SUCCESS; |
| 87 | int count, i; |
| 88 | unsigned int session_found = 0; |
| 89 | struct lttng_session *sessions; |
| 90 | |
| 91 | if (session_name && strlen(session_name) > NAME_MAX) { |
| 92 | ERR("Session name too long. Length must be lower or equal to %d", NAME_MAX); |
| 93 | ret = CMD_ERROR; |
| 94 | goto end; |
| 95 | } |
| 96 | |
| 97 | count = lttng_list_sessions(&sessions); |
| 98 | if (count < 0) { |
| 99 | ret = CMD_ERROR; |
| 100 | ERR("%s", lttng_strerror(count)); |
| 101 | goto end; |
| 102 | } |
| 103 | |
| 104 | for (i = 0; i < count; i++) { |
| 105 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { |
| 106 | session_found = 1; |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | if (!session_found) { |
| 112 | ERR("Session '%s' not found", session_name); |
| 113 | ret = CMD_ERROR; |
| 114 | goto error; |
| 115 | } |
| 116 | |
| 117 | ret = config_init(session_name); |
| 118 | if (ret < 0) { |
| 119 | ERR("Unable to set session name"); |
| 120 | ret = CMD_ERROR; |
| 121 | goto error; |
| 122 | } |
| 123 | |
| 124 | MSG("Session set to %s", session_name); |
| 125 | if (lttng_opt_mi) { |
| 126 | ret = mi_print(session_name); |
| 127 | if (ret) { |
| 128 | ret = CMD_ERROR; |
| 129 | goto error; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | ret = CMD_SUCCESS; |
| 134 | |
| 135 | error: |
| 136 | free(sessions); |
| 137 | end: |
| 138 | return ret; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * cmd_set_session |
| 143 | */ |
| 144 | int cmd_set_session(int argc, const char **argv) |
| 145 | { |
| 146 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
| 147 | static poptContext pc; |
| 148 | const char *arg_session_name = nullptr; |
| 149 | |
| 150 | pc = poptGetContext(nullptr, argc, argv, long_options, 0); |
| 151 | poptReadDefaultConfig(pc, 0); |
| 152 | |
| 153 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 154 | switch (opt) { |
| 155 | case OPT_HELP: |
| 156 | SHOW_HELP(); |
| 157 | goto end; |
| 158 | case OPT_LIST_OPTIONS: |
| 159 | list_cmd_options(stdout, long_options); |
| 160 | goto end; |
| 161 | default: |
| 162 | ret = CMD_UNDEFINED; |
| 163 | goto end; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | arg_session_name = poptGetArg(pc); |
| 168 | if (arg_session_name == nullptr) { |
| 169 | ERR("Missing session name"); |
| 170 | ret = CMD_ERROR; |
| 171 | goto end; |
| 172 | } |
| 173 | |
| 174 | /* Mi check */ |
| 175 | if (lttng_opt_mi) { |
| 176 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 177 | if (!writer) { |
| 178 | ret = -LTTNG_ERR_NOMEM; |
| 179 | goto end; |
| 180 | } |
| 181 | |
| 182 | /* Open command element */ |
| 183 | ret = mi_lttng_writer_command_open(writer, mi_lttng_element_command_set_session); |
| 184 | if (ret) { |
| 185 | ret = CMD_ERROR; |
| 186 | goto end; |
| 187 | } |
| 188 | |
| 189 | /* Open output element */ |
| 190 | ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command_output); |
| 191 | if (ret) { |
| 192 | ret = CMD_ERROR; |
| 193 | goto end; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | command_ret = set_session(arg_session_name); |
| 198 | if (command_ret) { |
| 199 | success = 0; |
| 200 | } |
| 201 | |
| 202 | /* Mi closing */ |
| 203 | if (lttng_opt_mi) { |
| 204 | /* Close output element */ |
| 205 | ret = mi_lttng_writer_close_element(writer); |
| 206 | if (ret) { |
| 207 | ret = CMD_ERROR; |
| 208 | goto end; |
| 209 | } |
| 210 | |
| 211 | /* Success ? */ |
| 212 | ret = mi_lttng_writer_write_element_bool( |
| 213 | writer, mi_lttng_element_command_success, success); |
| 214 | if (ret) { |
| 215 | ret = CMD_ERROR; |
| 216 | goto end; |
| 217 | } |
| 218 | |
| 219 | /* Command element close */ |
| 220 | ret = mi_lttng_writer_command_close(writer); |
| 221 | if (ret) { |
| 222 | ret = CMD_ERROR; |
| 223 | goto end; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | end: |
| 228 | /* Mi clean-up */ |
| 229 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 230 | /* Preserve original error code */ |
| 231 | ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL; |
| 232 | } |
| 233 | |
| 234 | /* Overwrite ret if an error occurred during set_session() */ |
| 235 | ret = command_ret ? command_ret : ret; |
| 236 | |
| 237 | poptFreeContext(pc); |
| 238 | return ret; |
| 239 | } |