| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <popt.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | #include "../command.h" |
| 28 | |
| 29 | #include <common/sessiond-comm/sessiond-comm.h> |
| 30 | |
| 31 | static char *opt_session_name; |
| 32 | static int opt_destroy_all; |
| 33 | |
| 34 | enum { |
| 35 | OPT_HELP = 1, |
| 36 | OPT_LIST_OPTIONS, |
| 37 | }; |
| 38 | |
| 39 | static struct poptOption long_options[] = { |
| 40 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 41 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 42 | {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0}, |
| 43 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 44 | {0, 0, 0, 0, 0, 0, 0} |
| 45 | }; |
| 46 | |
| 47 | /* |
| 48 | * usage |
| 49 | */ |
| 50 | static void usage(FILE *ofp) |
| 51 | { |
| 52 | fprintf(ofp, "usage: lttng destroy [NAME] [OPTIONS]\n"); |
| 53 | fprintf(ofp, "\n"); |
| 54 | fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n"); |
| 55 | fprintf(ofp, "get it from the configuration directory (.lttng).\n"); |
| 56 | fprintf(ofp, "\n"); |
| 57 | fprintf(ofp, "Options:\n"); |
| 58 | fprintf(ofp, " -h, --help Show this help\n"); |
| 59 | fprintf(ofp, " -a, --all Destroy all sessions\n"); |
| 60 | fprintf(ofp, " --list-options Simple listing of options\n"); |
| 61 | fprintf(ofp, "\n"); |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * destroy_session |
| 66 | * |
| 67 | * Unregister the provided session to the session daemon. On success, removes |
| 68 | * the default configuration. |
| 69 | */ |
| 70 | static int destroy_session(const char *session_name) |
| 71 | { |
| 72 | int ret; |
| 73 | |
| 74 | ret = lttng_destroy_session(session_name); |
| 75 | if (ret < 0) { |
| 76 | switch (-ret) { |
| 77 | case LTTNG_ERR_SESS_NOT_FOUND: |
| 78 | WARN("Session name %s not found", session_name); |
| 79 | break; |
| 80 | default: |
| 81 | ERR("%s", lttng_strerror(ret)); |
| 82 | break; |
| 83 | } |
| 84 | goto error; |
| 85 | } |
| 86 | |
| 87 | MSG("Session %s destroyed", session_name); |
| 88 | config_destroy_default(); |
| 89 | ret = CMD_SUCCESS; |
| 90 | error: |
| 91 | return ret; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * destroy_all_sessions |
| 96 | * |
| 97 | * Call destroy_sessions for each registered sessions |
| 98 | */ |
| 99 | static int destroy_all_sessions() |
| 100 | { |
| 101 | int count, i, ret = CMD_SUCCESS; |
| 102 | struct lttng_session *sessions; |
| 103 | |
| 104 | count = lttng_list_sessions(&sessions); |
| 105 | if (count == 0) { |
| 106 | MSG("No session found, nothing to do."); |
| 107 | } else if (count < 0) { |
| 108 | ERR("%s", lttng_strerror(ret)); |
| 109 | goto error; |
| 110 | } |
| 111 | |
| 112 | for (i = 0; i < count; i++) { |
| 113 | ret = destroy_session(sessions[i].name); |
| 114 | if (ret < 0) { |
| 115 | goto error; |
| 116 | } |
| 117 | } |
| 118 | error: |
| 119 | return ret; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * The 'destroy <options>' first level command |
| 124 | */ |
| 125 | int cmd_destroy(int argc, const char **argv) |
| 126 | { |
| 127 | int opt; |
| 128 | int ret = CMD_SUCCESS; |
| 129 | static poptContext pc; |
| 130 | char *session_name = NULL; |
| 131 | |
| 132 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 133 | poptReadDefaultConfig(pc, 0); |
| 134 | |
| 135 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 136 | switch (opt) { |
| 137 | case OPT_HELP: |
| 138 | usage(stdout); |
| 139 | break; |
| 140 | case OPT_LIST_OPTIONS: |
| 141 | list_cmd_options(stdout, long_options); |
| 142 | break; |
| 143 | default: |
| 144 | usage(stderr); |
| 145 | ret = CMD_UNDEFINED; |
| 146 | break; |
| 147 | } |
| 148 | goto end; |
| 149 | } |
| 150 | |
| 151 | /* Ignore session name in case all sessions are to be destroyed */ |
| 152 | if (opt_destroy_all) { |
| 153 | ret = destroy_all_sessions(); |
| 154 | goto end; |
| 155 | } |
| 156 | |
| 157 | opt_session_name = (char *) poptGetArg(pc); |
| 158 | |
| 159 | if (opt_session_name == NULL) { |
| 160 | /* No session name specified, lookup default */ |
| 161 | session_name = get_session_name(); |
| 162 | if (session_name == NULL) { |
| 163 | ret = CMD_ERROR; |
| 164 | goto end; |
| 165 | } |
| 166 | } else { |
| 167 | session_name = opt_session_name; |
| 168 | } |
| 169 | |
| 170 | ret = destroy_session(session_name); |
| 171 | |
| 172 | end: |
| 173 | if (opt_session_name == NULL) { |
| 174 | free(session_name); |
| 175 | } |
| 176 | |
| 177 | poptFreeContext(pc); |
| 178 | return ret; |
| 179 | } |