src/common/error.c

   1 /*
   2  * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <inttypes.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include <lttng/lttng-error.h>
  25 #include <common/common.h>
  26 #include <common/compat/getenv.h>
  27
  28 #include "error.h"
  29
  30 #define ERROR_INDEX(code) (code - LTTNG_OK)
  31
  32 /*
  33  * lttng_opt_abort_on_error: unset: -1, disabled: 0, enabled: 1.
  34  * Controlled by the LTTNG_ABORT_ON_ERROR environment variable.
  35  */
  36 static int lttng_opt_abort_on_error = -1;
  37
  38 /* TLS variable that contains the time of one single log entry. */
  39 DEFINE_URCU_TLS(struct log_time, error_log_time);
  40
  41 LTTNG_HIDDEN
  42 const char *log_add_time(void)
  43 {
  44         int ret;
  45         struct tm tm, *res;
  46         struct timespec tp;
  47         time_t now;
  48
  49         ret = clock_gettime(CLOCK_REALTIME, &tp);
  50         if (ret < 0) {
  51                 goto error;
  52         }
  53         now = (time_t) tp.tv_sec;
  54
  55         res = localtime_r(&now, &tm);
  56         if (!res) {
  57                 goto error;
  58         }
  59
  60         /* Format time in the TLS variable. */
  61         ret = snprintf(URCU_TLS(error_log_time).str, sizeof(URCU_TLS(error_log_time).str),
  62                         "%02d:%02d:%02d.%06ld",
  63                         tm.tm_hour, tm.tm_min, tm.tm_sec, tp.tv_nsec);
  64         if (ret < 0) {
  65                 goto error;
  66         }
  67
  68         return URCU_TLS(error_log_time).str;
  69
  70 error:
  71         /* Return an empty string on error so logging is not affected. */
  72         return "";
  73 }
  74
  75 /*
  76  * Human readable error message.
  77  */
  78 static const char *error_string_array[] = {
  79         /* LTTNG_OK code MUST be at the top for the ERROR_INDEX macro to work */
  80         [ ERROR_INDEX(LTTNG_OK) ] = "Success",
  81         [ ERROR_INDEX(LTTNG_ERR_UNK) ] = "Unknown error",
  82         [ ERROR_INDEX(LTTNG_ERR_UND) ] = "Undefined command",
  83         [ ERROR_INDEX(LTTNG_ERR_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
  84         [ ERROR_INDEX(LTTNG_ERR_NO_SESSION) ] = "No session found",
  85         [ ERROR_INDEX(LTTNG_ERR_CREATE_DIR_FAIL) ] = "Create directory failed",
  86         [ ERROR_INDEX(LTTNG_ERR_SESSION_FAIL) ] = "Create session failed",
  87         [ ERROR_INDEX(LTTNG_ERR_SESS_NOT_FOUND) ] = "Session name not found",
  88         [ ERROR_INDEX(LTTNG_ERR_FATAL) ] = "Fatal error of the session daemon",
  89         [ ERROR_INDEX(LTTNG_ERR_SELECT_SESS) ] = "A session MUST be selected",
  90         [ ERROR_INDEX(LTTNG_ERR_EXIST_SESS) ] = "Session name already exists",
  91         [ ERROR_INDEX(LTTNG_ERR_NO_EVENT) ] = "Event not found",
  92         [ ERROR_INDEX(LTTNG_ERR_CONNECT_FAIL) ] = "Unable to connect to Unix socket",
  93         [ ERROR_INDEX(LTTNG_ERR_EPERM) ] = "Permission denied",
  94         [ ERROR_INDEX(LTTNG_ERR_KERN_NA) ] = "Kernel tracer not available",
  95         [ ERROR_INDEX(LTTNG_ERR_KERN_VERSION) ] = "Kernel tracer version is not compatible",
  96         [ ERROR_INDEX(LTTNG_ERR_KERN_EVENT_EXIST) ] = "Kernel event already exists",
  97         [ ERROR_INDEX(LTTNG_ERR_KERN_SESS_FAIL) ] = "Kernel create session failed",
  98         [ ERROR_INDEX(LTTNG_ERR_KERN_CHAN_EXIST) ] = "Kernel channel already exists",
  99         [ ERROR_INDEX(LTTNG_ERR_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
 100         [ ERROR_INDEX(LTTNG_ERR_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
 101         [ ERROR_INDEX(LTTNG_ERR_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
 102         [ ERROR_INDEX(LTTNG_ERR_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed",
 103         [ ERROR_INDEX(LTTNG_ERR_KERN_CONTEXT_FAIL) ] = "Add kernel context failed",
 104         [ ERROR_INDEX(LTTNG_ERR_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
 105         [ ERROR_INDEX(LTTNG_ERR_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
 106         [ ERROR_INDEX(LTTNG_ERR_KERN_META_FAIL) ] = "Opening metadata failed",
 107         [ ERROR_INDEX(LTTNG_ERR_KERN_START_FAIL) ] = "Starting kernel trace failed",
 108         [ ERROR_INDEX(LTTNG_ERR_KERN_STOP_FAIL) ] = "Stopping kernel trace failed",
 109         [ ERROR_INDEX(LTTNG_ERR_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
 110         [ ERROR_INDEX(LTTNG_ERR_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
 111         [ ERROR_INDEX(LTTNG_ERR_KERN_LIST_FAIL) ] = "Listing kernel events failed",
 112         [ ERROR_INDEX(LTTNG_ERR_UST_CALIBRATE_FAIL) ] = "UST calibration failed",
 113         [ ERROR_INDEX(LTTNG_ERR_UST_SESS_FAIL) ] = "UST create session failed",
 114         [ ERROR_INDEX(LTTNG_ERR_UST_CHAN_FAIL) ] = "UST create channel failed",
 115         [ ERROR_INDEX(LTTNG_ERR_UST_CHAN_EXIST) ] = "UST channel already exist",
 116         [ ERROR_INDEX(LTTNG_ERR_UST_CHAN_NOT_FOUND) ] = "UST channel not found",
 117         [ ERROR_INDEX(LTTNG_ERR_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed",
 118         [ ERROR_INDEX(LTTNG_ERR_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed",
 119         [ ERROR_INDEX(LTTNG_ERR_UST_ENABLE_FAIL) ] = "Enable UST event failed",
 120         [ ERROR_INDEX(LTTNG_ERR_UST_DISABLE_FAIL) ] = "Disable UST event failed",
 121         [ ERROR_INDEX(LTTNG_ERR_UST_META_FAIL) ] = "Opening metadata failed",
 122         [ ERROR_INDEX(LTTNG_ERR_UST_START_FAIL) ] = "Starting UST trace failed",
 123         [ ERROR_INDEX(LTTNG_ERR_UST_STOP_FAIL) ] = "Stopping UST trace failed",
 124         [ ERROR_INDEX(LTTNG_ERR_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed",
 125         [ ERROR_INDEX(LTTNG_ERR_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed",
 126         [ ERROR_INDEX(LTTNG_ERR_UST_STREAM_FAIL) ] = "UST create stream failed",
 127         [ ERROR_INDEX(LTTNG_ERR_UST_LIST_FAIL) ] = "Listing UST events failed",
 128         [ ERROR_INDEX(LTTNG_ERR_UST_EVENT_EXIST) ] = "UST event already exist",
 129         [ ERROR_INDEX(LTTNG_ERR_UST_EVENT_NOT_FOUND)] = "UST event not found",
 130         [ ERROR_INDEX(LTTNG_ERR_UST_CONTEXT_EXIST)] = "UST context already exist",
 131         [ ERROR_INDEX(LTTNG_ERR_UST_CONTEXT_INVAL)] = "UST invalid context",
 132         [ ERROR_INDEX(LTTNG_ERR_NEED_ROOT_SESSIOND) ] = "Tracing the kernel requires a root lttng-sessiond daemon, as well as \"tracing\" group membership or root user ID for the lttng client.",
 133         [ ERROR_INDEX(LTTNG_ERR_NO_UST) ] = "LTTng-UST tracer is not supported. Please rebuild lttng-tools with lttng-ust support enabled.",
 134         [ ERROR_INDEX(LTTNG_ERR_TRACE_ALREADY_STARTED) ] = "Tracing has already been started once",
 135         [ ERROR_INDEX(LTTNG_ERR_TRACE_ALREADY_STOPPED) ] = "Tracing has already been stopped",
 136         [ ERROR_INDEX(LTTNG_ERR_KERN_EVENT_ENOSYS) ] = "Kernel event type not supported",
 137         [ ERROR_INDEX(LTTNG_ERR_NEED_CHANNEL_NAME) ] = "Non-default channel exists within session: channel name needs to be specified with '-c name'",
 138         [ ERROR_INDEX(LTTNG_ERR_INVALID) ] = "Invalid parameter",
 139         [ ERROR_INDEX(LTTNG_ERR_NO_USTCONSUMERD) ] = "No UST consumer detected",
 140         [ ERROR_INDEX(LTTNG_ERR_NO_KERNCONSUMERD) ] = "No kernel consumer detected",
 141         [ ERROR_INDEX(LTTNG_ERR_EVENT_EXIST_LOGLEVEL) ] = "Event already enabled with different loglevel",
 142         [ ERROR_INDEX(LTTNG_ERR_URL_DATA_MISS) ] = "Missing data path URL",
 143         [ ERROR_INDEX(LTTNG_ERR_URL_CTRL_MISS) ] = "Missing control path URL",
 144         [ ERROR_INDEX(LTTNG_ERR_ENABLE_CONSUMER_FAIL) ] = "Enabling consumer failed",
 145         [ ERROR_INDEX(LTTNG_ERR_RELAYD_CONNECT_FAIL) ] = "Unable to connect to lttng-relayd",
 146         [ ERROR_INDEX(LTTNG_ERR_RELAYD_VERSION_FAIL) ] = "Relay daemon not compatible",
 147         [ ERROR_INDEX(LTTNG_ERR_FILTER_INVAL) ] = "Invalid filter bytecode",
 148         [ ERROR_INDEX(LTTNG_ERR_FILTER_NOMEM) ] = "Not enough memory for filter bytecode",
 149         [ ERROR_INDEX(LTTNG_ERR_FILTER_EXIST) ] = "Filter already exist",
 150         [ ERROR_INDEX(LTTNG_ERR_NO_CONSUMER) ] = "Consumer not found for tracing session",
 151         [ ERROR_INDEX(LTTNG_ERR_NO_SESSIOND) ] = "No session daemon is available",
 152         [ ERROR_INDEX(LTTNG_ERR_SESSION_STARTED) ] = "Session is running",
 153         [ ERROR_INDEX(LTTNG_ERR_NOT_SUPPORTED) ] = "Operation not supported",
 154         [ ERROR_INDEX(LTTNG_ERR_UST_EVENT_ENABLED) ] = "UST event already enabled",
 155         [ ERROR_INDEX(LTTNG_ERR_SET_URL) ] = "Error setting URL",
 156         [ ERROR_INDEX(LTTNG_ERR_URL_EXIST) ] = "URL already exists",
 157         [ ERROR_INDEX(LTTNG_ERR_BUFFER_NOT_SUPPORTED)] = "Buffer type not supported",
 158         [ ERROR_INDEX(LTTNG_ERR_BUFFER_TYPE_MISMATCH)] = "Buffer type mismatch for session",
 159         [ ERROR_INDEX(LTTNG_ERR_NOMEM)] = "Not enough memory",
 160         [ ERROR_INDEX(LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST) ] = "Snapshot output already exists",
 161         [ ERROR_INDEX(LTTNG_ERR_START_SESSION_ONCE) ] = "Session needs to be started once",
 162         [ ERROR_INDEX(LTTNG_ERR_SNAPSHOT_FAIL) ] = "Snapshot record failed",
 163         [ ERROR_INDEX(LTTNG_ERR_CHAN_EXIST) ] = "Channel already exists",
 164         [ ERROR_INDEX(LTTNG_ERR_SNAPSHOT_NODATA) ] = "No data available in snapshot",
 165         [ ERROR_INDEX(LTTNG_ERR_NO_CHANNEL) ] = "No channel found in the session",
 166         [ ERROR_INDEX(LTTNG_ERR_SESSION_INVALID_CHAR) ] = "Invalid character found in session name",
 167         [ ERROR_INDEX(LTTNG_ERR_SAVE_FILE_EXIST) ] = "Session file already exists",
 168         [ ERROR_INDEX(LTTNG_ERR_SAVE_IO_FAIL) ] = "IO error while writing session configuration",
 169         [ ERROR_INDEX(LTTNG_ERR_LOAD_INVALID_CONFIG) ] = "Invalid session configuration",
 170         [ ERROR_INDEX(LTTNG_ERR_LOAD_IO_FAIL) ] = "IO error while reading a session configuration",
 171         [ ERROR_INDEX(LTTNG_ERR_LOAD_SESSION_NOENT) ] = "Session file not found",
 172         [ ERROR_INDEX(LTTNG_ERR_MAX_SIZE_INVALID) ] = "Snapshot max size is invalid",
 173         [ ERROR_INDEX(LTTNG_ERR_MI_OUTPUT_TYPE) ] = "Invalid MI output format",
 174         [ ERROR_INDEX(LTTNG_ERR_MI_IO_FAIL) ] = "IO error while writing MI output",
 175         [ ERROR_INDEX(LTTNG_ERR_MI_NOT_IMPLEMENTED) ] = "Mi feature not implemented",
 176         [ ERROR_INDEX(LTTNG_ERR_INVALID_EVENT_NAME) ] = "Invalid event name",
 177         [ ERROR_INDEX(LTTNG_ERR_INVALID_CHANNEL_NAME) ] = "Invalid channel name",
 178         [ ERROR_INDEX(LTTNG_ERR_PID_TRACKED) ] = "PID already tracked",
 179         [ ERROR_INDEX(LTTNG_ERR_PID_NOT_TRACKED) ] = "PID not tracked",
 180         [ ERROR_INDEX(LTTNG_ERR_INVALID_CHANNEL_DOMAIN) ] = "Invalid channel domain",
 181         [ ERROR_INDEX(LTTNG_ERR_OVERFLOW) ] = "Overflow occurred",
 182         [ ERROR_INDEX(LTTNG_ERR_SESSION_NOT_STARTED) ] = "Session not started",
 183         [ ERROR_INDEX(LTTNG_ERR_LIVE_SESSION) ] = "Live sessions are not supported",
 184         [ ERROR_INDEX(LTTNG_ERR_PER_PID_SESSION) ] = "Per-PID tracing sessions are not supported",
 185         [ ERROR_INDEX(LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE) ] = "Context unavailable on this kernel",
 186
 187         /* Last element */
 188         [ ERROR_INDEX(LTTNG_ERR_NR) ] = "Unknown error code"
 189 };
 190
 191 /*
 192  * Return ptr to string representing a human readable error code from the
 193  * lttng_error_code enum.
 194  *
 195  * These code MUST be negative in other to treat that as an error value.
 196  */
 197 LTTNG_HIDDEN
 198 const char *error_get_str(int32_t code)
 199 {
 200         code = -code;
 201
 202         if (code < LTTNG_OK || code > LTTNG_ERR_NR) {
 203                 code = LTTNG_ERR_NR;
 204         }
 205
 206         return error_string_array[ERROR_INDEX(code)];
 207 }
 208
 209 LTTNG_HIDDEN
 210 void lttng_abort_on_error(void)
 211 {
 212         if (lttng_opt_abort_on_error < 0) {
 213                 /* Use lttng_secure_getenv() to query its state. */
 214                 const char *value;
 215
 216                 value = lttng_secure_getenv("LTTNG_ABORT_ON_ERROR");
 217                 if (value && !strcmp(value, "1")) {
 218                         lttng_opt_abort_on_error = 1;
 219                 } else {
 220                         lttng_opt_abort_on_error = 0;
 221                 }
 222         }
 223         if (lttng_opt_abort_on_error > 0) {
 224                 abort();
 225         }
 226 }