| 1 | /* Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public |
| 5 | * License as published by the Free Software Foundation; either |
| 6 | * version 2.1 of the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library 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 GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <stdio.h> |
| 20 | #include <unistd.h> |
| 21 | #include <getopt.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <fcntl.h> |
| 24 | #include <string.h> |
| 25 | #include <dirent.h> |
| 26 | |
| 27 | #include "ustcomm.h" |
| 28 | #include "ustcmd.h" |
| 29 | |
| 30 | pid_t *ustcmd_get_online_pids(void) |
| 31 | { |
| 32 | struct dirent *dirent; |
| 33 | DIR *dir; |
| 34 | unsigned int ret_size = 1 * sizeof(pid_t), i = 0; |
| 35 | |
| 36 | dir = opendir(SOCK_DIR); |
| 37 | if (!dir) { |
| 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | pid_t *ret = (pid_t *) malloc(ret_size); |
| 42 | |
| 43 | while ((dirent = readdir(dir))) { |
| 44 | if (!strcmp(dirent->d_name, ".") || |
| 45 | !strcmp(dirent->d_name, "..")) { |
| 46 | |
| 47 | continue; |
| 48 | } |
| 49 | |
| 50 | if (dirent->d_type != DT_DIR && |
| 51 | !!strcmp(dirent->d_name, "ustd")) { |
| 52 | |
| 53 | sscanf(dirent->d_name, "%u", (unsigned int *) &ret[i]); |
| 54 | if (pid_is_online(ret[i])) { |
| 55 | ret_size += sizeof(pid_t); |
| 56 | ret = (pid_t *) realloc(ret, ret_size); |
| 57 | ++i; |
| 58 | } |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | ret[i] = 0; /* Array end */ |
| 63 | |
| 64 | if (ret[0] == 0) { |
| 65 | /* No PID at all */ |
| 66 | free(ret); |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | closedir(dir); |
| 71 | return ret; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Sets marker state (USTCMD_MS_ON or USTCMD_MS_OFF). |
| 76 | * |
| 77 | * @param mn Marker name |
| 78 | * @param state Marker's new state |
| 79 | * @param pid Traced process ID |
| 80 | * @return 0 if successful, or errors {USTCMD_ERR_GEN, USTCMD_ERR_ARG} |
| 81 | */ |
| 82 | int ustcmd_set_marker_state(const char *mn, int state, pid_t pid) |
| 83 | { |
| 84 | char *cmd_str [] = {"disable_marker", "enable_marker"}; |
| 85 | char *cmd; |
| 86 | int result; |
| 87 | |
| 88 | if (mn == NULL) { |
| 89 | return USTCMD_ERR_ARG; |
| 90 | } |
| 91 | |
| 92 | asprintf(&cmd, "%s %s", cmd_str[state], mn); |
| 93 | |
| 94 | result = ustcmd_send_cmd(cmd, pid, NULL); |
| 95 | if (result) { |
| 96 | free(cmd); |
| 97 | return USTCMD_ERR_GEN; |
| 98 | } |
| 99 | |
| 100 | free(cmd); |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Destroys an UST trace according to a PID. |
| 106 | * |
| 107 | * @param pid Traced process ID |
| 108 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 109 | */ |
| 110 | int ustcmd_destroy_trace(pid_t pid) |
| 111 | { |
| 112 | int result; |
| 113 | |
| 114 | result = ustcmd_send_cmd("trace_destroy", pid, NULL); |
| 115 | if (result) { |
| 116 | return USTCMD_ERR_GEN; |
| 117 | } |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Starts an UST trace (and setups it) according to a PID. |
| 124 | * |
| 125 | * @param pid Traced process ID |
| 126 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 127 | */ |
| 128 | int ustcmd_setup_and_start(pid_t pid) |
| 129 | { |
| 130 | int result; |
| 131 | |
| 132 | result = ustcmd_send_cmd("start", pid, NULL); |
| 133 | if (result) { |
| 134 | return USTCMD_ERR_GEN; |
| 135 | } |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Creates an UST trace according to a PID. |
| 142 | * |
| 143 | * @param pid Traced process ID |
| 144 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 145 | */ |
| 146 | int ustcmd_create_trace(pid_t pid) |
| 147 | { |
| 148 | int result; |
| 149 | |
| 150 | result = ustcmd_send_cmd("trace_create", pid, NULL); |
| 151 | if (result) { |
| 152 | return USTCMD_ERR_GEN; |
| 153 | } |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Starts an UST trace according to a PID. |
| 160 | * |
| 161 | * @param pid Traced process ID |
| 162 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 163 | */ |
| 164 | int ustcmd_start_trace(pid_t pid) |
| 165 | { |
| 166 | int result; |
| 167 | |
| 168 | result = ustcmd_send_cmd("trace_start", pid, NULL); |
| 169 | if (result) { |
| 170 | return USTCMD_ERR_GEN; |
| 171 | } |
| 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Stops an UST trace according to a PID. |
| 178 | * |
| 179 | * @param pid Traced process ID |
| 180 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 181 | */ |
| 182 | int ustcmd_stop_trace(pid_t pid) |
| 183 | { |
| 184 | int result; |
| 185 | |
| 186 | result = ustcmd_send_cmd("trace_stop", pid, NULL); |
| 187 | if (result) { |
| 188 | return USTCMD_ERR_GEN; |
| 189 | } |
| 190 | |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Counts newlines ('\n') in a string. |
| 196 | * |
| 197 | * @param str String to search in |
| 198 | * @return Total newlines count |
| 199 | */ |
| 200 | unsigned int ustcmd_count_nl(const char *str) |
| 201 | { |
| 202 | unsigned int i = 0, tot = 0; |
| 203 | |
| 204 | while (str[i] != '\0') { |
| 205 | if (str[i] == '\n') { |
| 206 | ++tot; |
| 207 | } |
| 208 | ++i; |
| 209 | } |
| 210 | |
| 211 | return tot; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Frees a CMSF array. |
| 216 | * |
| 217 | * @param cmsf CMSF array to free |
| 218 | * @return 0 if successful, or error USTCMD_ERR_ARG |
| 219 | */ |
| 220 | int ustcmd_free_cmsf(struct marker_status *cmsf) |
| 221 | { |
| 222 | if (cmsf == NULL) { |
| 223 | return USTCMD_ERR_ARG; |
| 224 | } |
| 225 | |
| 226 | unsigned int i = 0; |
| 227 | while (cmsf[i].channel != NULL) { |
| 228 | free(cmsf[i].channel); |
| 229 | free(cmsf[i].marker); |
| 230 | free(cmsf[i].fs); |
| 231 | ++i; |
| 232 | } |
| 233 | free(cmsf); |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Gets channel/marker/state/format string for a given PID. |
| 240 | * |
| 241 | * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller |
| 242 | * frees with `ustcmd_free_cmsf') |
| 243 | * @param pid Targeted PID |
| 244 | * @return 0 if successful, or errors {USTCMD_ERR_ARG, USTCMD_ERR_GEN} |
| 245 | */ |
| 246 | int ustcmd_get_cmsf(struct marker_status **cmsf, const pid_t pid) |
| 247 | { |
| 248 | char *big_str = NULL; |
| 249 | int result; |
| 250 | struct marker_status *tmp_cmsf = NULL; |
| 251 | unsigned int i = 0, cmsf_ind = 0; |
| 252 | |
| 253 | if (cmsf == NULL) { |
| 254 | return USTCMD_ERR_ARG; |
| 255 | } |
| 256 | result = ustcmd_send_cmd("list_markers", pid, &big_str); |
| 257 | if (result) { |
| 258 | return USTCMD_ERR_GEN; |
| 259 | } |
| 260 | |
| 261 | if (big_str == NULL) { |
| 262 | fprintf(stderr, "ustcmd: error while getting markers list\n"); |
| 263 | return USTCMD_ERR_GEN; |
| 264 | } |
| 265 | |
| 266 | tmp_cmsf = (struct marker_status *) malloc(sizeof(struct marker_status) * |
| 267 | (ustcmd_count_nl(big_str) + 1)); |
| 268 | if (tmp_cmsf == NULL) { |
| 269 | return USTCMD_ERR_GEN; |
| 270 | } |
| 271 | |
| 272 | /* Parse received reply string (format: "[chan]/[mark] [st] [fs]"): */ |
| 273 | while (big_str[i] != '\0') { |
| 274 | char state; |
| 275 | |
| 276 | sscanf(big_str + i, "marker: %a[^/]/%a[^ ] %c %a[^\n]", |
| 277 | &tmp_cmsf[cmsf_ind].channel, |
| 278 | &tmp_cmsf[cmsf_ind].marker, |
| 279 | &state, |
| 280 | &tmp_cmsf[cmsf_ind].fs); |
| 281 | tmp_cmsf[cmsf_ind].state = (state == USTCMD_MS_CHR_ON ? |
| 282 | USTCMD_MS_ON : USTCMD_MS_OFF); /* Marker state */ |
| 283 | |
| 284 | while (big_str[i] != '\n') { |
| 285 | ++i; /* Go to next '\n' */ |
| 286 | } |
| 287 | ++i; /* Skip current pointed '\n' */ |
| 288 | ++cmsf_ind; |
| 289 | } |
| 290 | tmp_cmsf[cmsf_ind].channel = NULL; |
| 291 | tmp_cmsf[cmsf_ind].marker = NULL; |
| 292 | tmp_cmsf[cmsf_ind].fs = NULL; |
| 293 | |
| 294 | *cmsf = tmp_cmsf; |
| 295 | |
| 296 | free(big_str); |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * Shoots a given command using ustcomm. |
| 302 | * |
| 303 | * @param cmd Null-terminated command to shoot |
| 304 | * @param pid Targeted PID |
| 305 | * @param reply Pointer to string to be filled with a reply string (must |
| 306 | * be NULL if no reply is needed for the given command). |
| 307 | * @return 0 if successful, or errors {USTCMD_ERR_ARG, USTCMD_ERR_CONN} |
| 308 | */ |
| 309 | |
| 310 | int ustcmd_send_cmd(const char *cmd, const pid_t pid, char **reply) |
| 311 | { |
| 312 | struct ustcomm_connection conn; |
| 313 | |
| 314 | if (cmd == NULL) { |
| 315 | return USTCMD_ERR_ARG; |
| 316 | } |
| 317 | |
| 318 | if (ustcomm_connect_app(pid, &conn)) { |
| 319 | fprintf(stderr, "ustcmd_send_cmd: could not connect to PID %u\n", |
| 320 | (unsigned int) pid); |
| 321 | return USTCMD_ERR_CONN; |
| 322 | } |
| 323 | |
| 324 | ustcomm_send_request(&conn, cmd, reply); |
| 325 | |
| 326 | return 0; |
| 327 | } |