src/common/defaults.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *               2015 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifndef _DEFAULTS_H
  21 #define _DEFAULTS_H
  22
  23 #include <pthread.h>
  24 #include <src/common/macros.h>
  25
  26 /* Default unix group name for tracing. */
  27 #define DEFAULT_TRACING_GROUP                   "tracing"
  28
  29 /*
  30  * This value is defined in the CTF specification (see
  31  * git://git.efficios.com/ctf.git in the file
  32  * common-trace-format-specification.txt.
  33  */
  34 #define DEFAULT_METADATA_NAME                   "metadata"
  35
  36 /* Environment variable to set session daemon binary path. */
  37 #define DEFAULT_SESSIOND_PATH_ENV               "LTTNG_SESSIOND_PATH"
  38
  39 /* Environment variable to set man pager binary path. */
  40 #define DEFAULT_MAN_BIN_PATH_ENV                "LTTNG_MAN_BIN_PATH"
  41
  42 /* Default man pager binary path. */
  43 #define DEFAULT_MAN_BIN_PATH                    "/usr/bin/man"
  44
  45 /* Default trace output directory name */
  46 #define DEFAULT_TRACE_DIR_NAME                  "lttng-traces"
  47
  48 /* Default size of a hash table */
  49 #define DEFAULT_HT_SIZE                         4
  50
  51 /* Default session daemon paths */
  52 #define DEFAULT_HOME_DIR                                                "/tmp"
  53 #define DEFAULT_UST_SOCK_DIR                    DEFAULT_HOME_DIR "/ust-app-socks"
  54 #define DEFAULT_GLOBAL_APPS_PIPE                DEFAULT_UST_SOCK_DIR "/global"
  55 #define DEFAULT_TRACE_OUTPUT                    DEFAULT_HOME_DIR "/lttng"
  56
  57 /* Default directory where the trace are written in per domain */
  58 #define DEFAULT_KERNEL_TRACE_DIR                "/kernel"
  59 #define DEFAULT_UST_TRACE_DIR                   "/ust"
  60
  61 /* Subpath for per PID or UID sessions. */
  62 #define DEFAULT_UST_TRACE_PID_PATH               "/pid"
  63 #define DEFAULT_UST_TRACE_UID_PATH               "/uid/%d/%u-bit"
  64
  65 /*
  66  * Default session name for the lttng command line. This default value will
  67  * get the date and time appended (%Y%m%d-%H%M%S) to it.
  68  */
  69 #define DEFAULT_SESSION_NAME                    "auto"
  70
  71 /* Default consumer paths */
  72 #define DEFAULT_CONSUMERD_RUNDIR                "%s"
  73
  74 /* Kernel consumer path */
  75 #define DEFAULT_KCONSUMERD_PATH                 DEFAULT_CONSUMERD_RUNDIR "/kconsumerd"
  76 #define DEFAULT_KCONSUMERD_CMD_SOCK_PATH        DEFAULT_KCONSUMERD_PATH "/command"
  77 #define DEFAULT_KCONSUMERD_ERR_SOCK_PATH        DEFAULT_KCONSUMERD_PATH "/error"
  78
  79 /* UST 64-bit consumer path */
  80 #define DEFAULT_USTCONSUMERD64_PATH             DEFAULT_CONSUMERD_RUNDIR "/ustconsumerd64"
  81 #define DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH    DEFAULT_USTCONSUMERD64_PATH "/command"
  82 #define DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH    DEFAULT_USTCONSUMERD64_PATH "/error"
  83
  84 /* UST 32-bit consumer path */
  85 #define DEFAULT_USTCONSUMERD32_PATH             DEFAULT_CONSUMERD_RUNDIR "/ustconsumerd32"
  86 #define DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH    DEFAULT_USTCONSUMERD32_PATH "/command"
  87 #define DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH    DEFAULT_USTCONSUMERD32_PATH "/error"
  88
  89 /* Relayd path */
  90 #define DEFAULT_RELAYD_RUNDIR                   "%s"
  91 #define DEFAULT_RELAYD_PATH                     DEFAULT_RELAYD_RUNDIR "/relayd"
  92
  93 /* Default lttng run directory */
  94 #define DEFAULT_LTTNG_HOME_ENV_VAR              "LTTNG_HOME"
  95 #define DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR     "HOME"
  96 #define DEFAULT_LTTNG_RUNDIR                    CONFIG_LTTNG_SYSTEM_RUNDIR
  97 #define DEFAULT_LTTNG_HOME_RUNDIR               "%s/.lttng"
  98 #define DEFAULT_LTTNG_SESSIOND_PIDFILE          "lttng-sessiond.pid"
  99 #define DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE   "agent.port"
 100 #define DEFAULT_LTTNG_SESSIOND_LOCKFILE         "lttng-sessiond.lck"
 101
 102 /* Default probes list */
 103 #define DEFAULT_LTTNG_KMOD_PROBES               "LTTNG_KMOD_PROBES"
 104
 105 /* Default extra probes list */
 106 #define DEFAULT_LTTNG_EXTRA_KMOD_PROBES         "LTTNG_EXTRA_KMOD_PROBES"
 107
 108 /* Default unix socket path */
 109 #define DEFAULT_GLOBAL_CLIENT_UNIX_SOCK                 DEFAULT_LTTNG_RUNDIR "/client-lttng-sessiond"
 110 #define DEFAULT_HOME_CLIENT_UNIX_SOCK                   DEFAULT_LTTNG_HOME_RUNDIR "/client-lttng-sessiond"
 111 #define DEFAULT_GLOBAL_HEALTH_UNIX_SOCK                 DEFAULT_LTTNG_RUNDIR "/sessiond-health"
 112 #define DEFAULT_HOME_HEALTH_UNIX_SOCK                   DEFAULT_LTTNG_HOME_RUNDIR "/sessiond-health"
 113 #define DEFAULT_GLOBAL_NOTIFICATION_CHANNEL_UNIX_SOCK   DEFAULT_LTTNG_RUNDIR "/sessiond-notification"
 114 #define DEFAULT_HOME_NOTIFICATION_CHANNEL_UNIX_SOCK     DEFAULT_LTTNG_HOME_RUNDIR "/sessiond-notification"
 115
 116 /* Default consumer health unix socket path */
 117 #define DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK   DEFAULT_LTTNG_RUNDIR "/ustconsumerd32/health"
 118 #define DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK     DEFAULT_LTTNG_HOME_RUNDIR "/ustconsumerd32/health"
 119 #define DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK   DEFAULT_LTTNG_RUNDIR "/ustconsumerd64/health"
 120 #define DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK     DEFAULT_LTTNG_HOME_RUNDIR "/ustconsumerd64/health"
 121 #define DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK       DEFAULT_LTTNG_RUNDIR "/kconsumerd/health"
 122 #define DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK         DEFAULT_LTTNG_HOME_RUNDIR "/kconsumerd/health"
 123
 124 /* Default relay health unix socket path */
 125 #define DEFAULT_GLOBAL_RELAY_HEALTH_UNIX_SOCK           DEFAULT_LTTNG_RUNDIR "/relayd/health-%d"
 126 #define DEFAULT_HOME_RELAY_HEALTH_UNIX_SOCK             DEFAULT_LTTNG_HOME_RUNDIR "/relayd/health-%d"
 127
 128 /* Default daemon configuration file path */
 129 #define DEFAULT_SYSTEM_CONFIGPATH               CONFIG_LTTNG_SYSTEM_CONFIGDIR \
 130         "/lttng"
 131
 132 #define DEFAULT_DAEMON_CONFIG_FILE              "lttng.conf"
 133 #define DEFAULT_DAEMON_HOME_CONFIGPATH          DEFAULT_LTTNG_HOME_RUNDIR "/" \
 134         DEFAULT_DAEMON_CONFIG_FILE
 135 #define DEFAULT_DAEMON_SYSTEM_CONFIGPATH        DEFAULT_SYSTEM_CONFIGPATH "/" \
 136         DEFAULT_DAEMON_CONFIG_FILE
 137
 138 /* Default session configuration file path */
 139 #define DEFAULT_SESSION_PATH                    "sessions"
 140 /* Auto load session in that directory. */
 141 #define DEFAULT_SESSION_CONFIG_AUTOLOAD         "auto"
 142 #define DEFAULT_SESSION_HOME_CONFIGPATH         DEFAULT_LTTNG_HOME_RUNDIR "/" \
 143         DEFAULT_SESSION_PATH
 144 #define DEFAULT_SESSION_SYSTEM_CONFIGPATH       DEFAULT_SYSTEM_CONFIGPATH "/" \
 145         DEFAULT_SESSION_PATH
 146 #define DEFAULT_SESSION_CONFIG_FILE_EXTENSION   ".lttng"
 147 #define DEFAULT_SESSION_CONFIG_XSD_FILENAME     "session.xsd"
 148 #define DEFAULT_SESSION_CONFIG_XSD_PATH         CONFIG_LTTNG_SYSTEM_DATADIR "/xml/lttng/"
 149 #define DEFAULT_SESSION_CONFIG_XSD_PATH_ENV     "LTTNG_SESSION_CONFIG_XSD_PATH"
 150
 151 #define DEFAULT_GLOBAL_APPS_UNIX_SOCK \
 152         DEFAULT_LTTNG_RUNDIR "/" LTTNG_UST_SOCK_FILENAME
 153 #define DEFAULT_HOME_APPS_UNIX_SOCK \
 154         DEFAULT_LTTNG_HOME_RUNDIR "/" LTTNG_UST_SOCK_FILENAME
 155 #define DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH \
 156         "/" LTTNG_UST_WAIT_FILENAME
 157 #define DEFAULT_HOME_APPS_WAIT_SHM_PATH \
 158         DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH "-%d"
 159
 160 /*
 161  * Value taken from the hard limit allowed by the kernel when using setrlimit
 162  * with RLIMIT_NOFILE on an Intel i7 CPU and Linux 3.0.3.
 163  */
 164 #define DEFAULT_POLL_SIZE 65535
 165
 166 /*
 167  * Format is %s_%d respectively channel name and CPU number. Eigth bytes
 168  * are added here to add space for the CPU number. I guess 2^8 CPUs is more
 169  * than enough. We might end up with quantum computing in a cell phone when
 170  * reaching this limit.
 171  */
 172 #define DEFAULT_STREAM_NAME_LEN        LTTNG_SYMBOL_NAME_LEN + 8
 173
 174 /* Default channel attributes */
 175 #define DEFAULT_CHANNEL_NAME            "channel0"
 176 /* Default JUL domain channel name. */
 177 #define DEFAULT_JUL_CHANNEL_NAME        "lttng_jul_channel"
 178 /* Default JUL tracepoint name. This is a wildcard for the JUL domain. */
 179 #define DEFAULT_JUL_EVENT_COMPONENT     "lttng_jul"
 180 #define DEFAULT_JUL_EVENT_NAME          DEFAULT_JUL_EVENT_COMPONENT ":*"
 181
 182 /* Default log4j domain channel name. */
 183 #define DEFAULT_LOG4J_CHANNEL_NAME        "lttng_log4j_channel"
 184 /* Default log4j tracepoint name. This is a wildcard for the log4j domain. */
 185 #define DEFAULT_LOG4J_EVENT_COMPONENT     "lttng_log4j"
 186 #define DEFAULT_LOG4J_EVENT_NAME          DEFAULT_LOG4J_EVENT_COMPONENT ":*"
 187
 188 /* Default Python domain channel name. */
 189 #define DEFAULT_PYTHON_CHANNEL_NAME       "lttng_python_channel"
 190 /* Default Python tracepoint name. This is a wildcard for the python domain. */
 191 #define DEFAULT_PYTHON_EVENT_COMPONENT    "lttng_python"
 192 #define DEFAULT_PYTHON_EVENT_NAME         DEFAULT_PYTHON_EVENT_COMPONENT ":*"
 193
 194 #define DEFAULT_CHANNEL_OVERWRITE       -1
 195 #define DEFAULT_CHANNEL_TRACEFILE_SIZE  CONFIG_DEFAULT_CHANNEL_TRACEFILE_SIZE
 196 #define DEFAULT_CHANNEL_TRACEFILE_COUNT CONFIG_DEFAULT_CHANNEL_TRACEFILE_COUNT
 197
 198 #define _DEFAULT_CHANNEL_SUBBUF_SIZE   CONFIG_DEFAULT_CHANNEL_SUBBUF_SIZE
 199 #define _DEFAULT_CHANNEL_OUTPUT                 LTTNG_EVENT_MMAP
 200
 201 /* Metadata channel defaults. */
 202 #define DEFAULT_METADATA_SUBBUF_SIZE    CONFIG_DEFAULT_METADATA_SUBBUF_SIZE
 203 #define DEFAULT_METADATA_SUBBUF_NUM     CONFIG_DEFAULT_METADATA_SUBBUF_NUM
 204 #define DEFAULT_METADATA_CACHE_SIZE     CONFIG_DEFAULT_METADATA_CACHE_SIZE
 205 #define DEFAULT_METADATA_SWITCH_TIMER   CONFIG_DEFAULT_METADATA_SWITCH_TIMER
 206 #define DEFAULT_METADATA_READ_TIMER     CONFIG_DEFAULT_METADATA_READ_TIMER
 207 #define DEFAULT_METADATA_OUTPUT                 _DEFAULT_CHANNEL_OUTPUT
 208
 209 /* Kernel has different defaults */
 210
 211 /* DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE must always be a power of 2 */
 212 #define DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE      CONFIG_DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE
 213 /*
 214  * DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM must always be a power of 2.
 215  * Update help manually if override.
 216  */
 217 #define DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM       CONFIG_DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
 218 /* See lttng-kernel.h enum lttng_kernel_output for channel output */
 219 #define DEFAULT_KERNEL_CHANNEL_OUTPUT                   LTTNG_EVENT_SPLICE
 220 #define DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER     CONFIG_DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
 221 #define DEFAULT_KERNEL_CHANNEL_READ_TIMER       CONFIG_DEFAULT_KERNEL_CHANNEL_READ_TIMER
 222 #define DEFAULT_KERNEL_CHANNEL_LIVE_TIMER       CONFIG_DEFAULT_KERNEL_CHANNEL_LIVE_TIMER
 223
 224 /* User space defaults */
 225
 226 /* Must be a power of 2 */
 227 #define DEFAULT_UST_PID_CHANNEL_SUBBUF_SIZE     CONFIG_DEFAULT_UST_PID_CHANNEL_SUBBUF_SIZE
 228 #define DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE     CONFIG_DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE
 229 /* Must be a power of 2. Update help manuall if override. */
 230 #define DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM      CONFIG_DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
 231 #define DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM      CONFIG_DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
 232 /* See lttng-ust.h enum lttng_ust_output */
 233 #define DEFAULT_UST_PID_CHANNEL_OUTPUT                  _DEFAULT_CHANNEL_OUTPUT
 234 #define DEFAULT_UST_UID_CHANNEL_OUTPUT                  _DEFAULT_CHANNEL_OUTPUT
 235 /* Timers in usec. */
 236 #define DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER    CONFIG_DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
 237 #define DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER    CONFIG_DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
 238 #define DEFAULT_UST_PID_CHANNEL_LIVE_TIMER      CONFIG_DEFAULT_UST_PID_CHANNEL_LIVE_TIMER
 239 #define DEFAULT_UST_UID_CHANNEL_LIVE_TIMER      CONFIG_DEFAULT_UST_UID_CHANNEL_LIVE_TIMER
 240
 241 #define DEFAULT_UST_PID_CHANNEL_READ_TIMER      CONFIG_DEFAULT_UST_PID_CHANNEL_READ_TIMER
 242 #define DEFAULT_UST_UID_CHANNEL_READ_TIMER      CONFIG_DEFAULT_UST_UID_CHANNEL_READ_TIMER
 243
 244 /*
 245  * Default timeout value for the sem_timedwait() call. Blocking forever is not
 246  * wanted so a timeout is used to control the data flow and not freeze the
 247  * session daemon.
 248  */
 249 #define DEFAULT_SEM_WAIT_TIMEOUT            30    /* in seconds */
 250
 251 /* Default bind addresses for network services. */
 252 #define DEFAULT_NETWORK_CONTROL_BIND_ADDRESS    CONFIG_DEFAULT_NETWORK_CONTROL_BIND_ADDRESS
 253 #define DEFAULT_NETWORK_DATA_BIND_ADDRESS       CONFIG_DEFAULT_NETWORK_DATA_BIND_ADDRESS
 254 #define DEFAULT_NETWORK_VIEWER_BIND_ADDRESS     CONFIG_DEFAULT_NETWORK_VIEWER_BIND_ADDRESS
 255 #define DEFAULT_AGENT_BIND_ADDRESS              CONFIG_DEFAULT_AGENT_BIND_ADDRESS
 256
 257 /* Default network ports for trace streaming support. */
 258 #define DEFAULT_NETWORK_CONTROL_PORT        CONFIG_DEFAULT_NETWORK_CONTROL_PORT
 259 #define DEFAULT_NETWORK_DATA_PORT           CONFIG_DEFAULT_NETWORK_DATA_PORT
 260 #define DEFAULT_NETWORK_VIEWER_PORT         CONFIG_DEFAULT_NETWORK_VIEWER_PORT
 261
 262 /* Agent registration TCP port. */
 263 #define DEFAULT_AGENT_TCP_PORT              CONFIG_DEFAULT_AGENT_TCP_PORT
 264
 265 /*
 266  * If a thread stalls for this amount of time, it will be considered bogus (bad
 267  * health).
 268  */
 269 #define DEFAULT_HEALTH_CHECK_DELTA_S        20
 270 #define DEFAULT_HEALTH_CHECK_DELTA_NS       0
 271
 272 /*
 273  * Wait period before retrying the lttng_data_pending command in the lttng
 274  * stop command of liblttng-ctl.
 275  */
 276 #define DEFAULT_DATA_AVAILABILITY_WAIT_TIME 200000  /* usec */
 277
 278 /*
 279  * Wait period before retrying the lttng_consumer_flushed_cache when
 280  * the consumer receives metadata.
 281  */
 282 #define DEFAULT_METADATA_AVAILABILITY_WAIT_TIME 200000  /* usec */
 283
 284 /*
 285  * The usual value for the maximum TCP SYN retries time and TCP FIN timeout is
 286  * 180 and 60 seconds on most Linux system and the default value since kernel
 287  * 2.2 thus using the highest value. See tcp(7) for more details.
 288  */
 289 #define DEFAULT_INET_TCP_TIMEOUT                        180     /* sec */
 290
 291 /*
 292  * Default receiving and sending timeout for an application socket.
 293  */
 294 #define DEFAULT_APP_SOCKET_RW_TIMEOUT       CONFIG_DEFAULT_APP_SOCKET_RW_TIMEOUT
 295 #define DEFAULT_APP_SOCKET_TIMEOUT_ENV      "LTTNG_APP_SOCKET_TIMEOUT"
 296
 297 #define DEFAULT_UST_STREAM_FD_NUM                       2 /* Number of fd per UST stream. */
 298
 299 #define DEFAULT_SNAPSHOT_NAME                           "snapshot"
 300 #define DEFAULT_SNAPSHOT_MAX_SIZE                       0 /* Unlimited. */
 301
 302 /* Suffix of an index file. */
 303 #define DEFAULT_INDEX_FILE_SUFFIX                       ".idx"
 304 #define DEFAULT_INDEX_DIR                                       "index"
 305
 306 /* Default lttng command live timer value in usec. */
 307 #define DEFAULT_LTTNG_LIVE_TIMER                        CONFIG_DEFAULT_LTTNG_LIVE_TIMER
 308
 309 /* Default runas worker name */
 310 #define DEFAULT_RUN_AS_WORKER_NAME                      "lttng-runas"
 311
 312 /* Default LTTng MI XML namespace. */
 313 #define DEFAULT_LTTNG_MI_NAMESPACE              "http://lttng.org/xml/ns/lttng-mi"
 314
 315 /* Default thread stack size; the default mandated by pthread_create(3) */
 316 #define DEFAULT_LTTNG_THREAD_STACK_SIZE         2097152
 317
 318 /* Default maximal size of message notification channel message payloads. */
 319 #define DEFAULT_MAX_NOTIFICATION_CLIENT_MESSAGE_PAYLOAD_SIZE    65536
 320
 321 /* Default maximal size of message notification channel message payloads. */
 322 #define DEFAULT_CLIENT_MAX_QUEUED_NOTIFICATIONS_COUNT           100
 323
 324 /*
 325  * Returns the default subbuf size.
 326  *
 327  * This function depends on a value that is set at constructor time, so it is
 328  * unsafe to call it from another constructor.
 329  */
 330 LTTNG_HIDDEN
 331 size_t default_get_channel_subbuf_size(void);
 332
 333 /*
 334  * Returns the default metadata subbuf size.
 335  *
 336  * This function depends on a value that is set at constructor time, so it is
 337  * unsafe to call it from another constructor.
 338  */
 339 LTTNG_HIDDEN
 340 size_t default_get_metadata_subbuf_size(void);
 341
 342 /*
 343  * Returns the default subbuf size for the kernel domain.
 344  *
 345  * This function depends on a value that is set at constructor time, so it is
 346  * unsafe to call it from another constructor.
 347  */
 348 LTTNG_HIDDEN
 349 size_t default_get_kernel_channel_subbuf_size(void);
 350
 351 /*
 352  * Returns the default subbuf size for the UST domain per PID.
 353  *
 354  * This function depends on a value that is set at constructor time, so it is
 355  * unsafe to call it from another constructor.
 356  */
 357 LTTNG_HIDDEN
 358 size_t default_get_ust_pid_channel_subbuf_size(void);
 359
 360 /*
 361  * Returns the default subbuf size for the UST domain per UID.
 362  *
 363  * This function depends on a value that is set at constructor time, so it is
 364  * unsafe to call it from another constructor.
 365  */
 366 LTTNG_HIDDEN
 367 size_t default_get_ust_uid_channel_subbuf_size(void);
 368
 369 /*
 370  * Get the default pthread_attr to use on thread creation.
 371  *
 372  * Some libc, such as musl, don't honor the limit set for the stack size and use
 373  * their own empirically chosen static value. This function checks if the
 374  * current stack size is smaller than the stack size limit and if so returns a
 375  * pthread_attr_t pointer where the thread stack size is set to the soft stack
 376  * size limit.
 377  */
 378 LTTNG_HIDDEN
 379 pthread_attr_t *default_pthread_attr(void);
 380
 381 #endif /* _DEFAULTS_H */