src/bin/lttng/commands/add_context.cpp

   1 /*
   2  * Copyright (C) 2011 EfficiOS Inc.
   3  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-only
   6  *
   7  */
   8
   9 #define _LGPL_SOURCE
  10 #include "../command.hpp"
  11
  12 #include <common/mi-lttng.hpp>
  13
  14 #include <lttng/domain-internal.hpp>
  15
  16 #include <ctype.h>
  17 #include <popt.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24 #include <urcu/list.h>
  25
  26 static char *opt_channel_name;
  27 static char *opt_session_name;
  28 static int opt_kernel;
  29 static int opt_userspace;
  30 static int opt_jul;
  31 static int opt_log4j;
  32 static char *opt_type;
  33
  34 #ifdef LTTNG_EMBED_HELP
  35 static const char help_msg[] =
  36 #include <lttng-add-context.1.h>
  37         ;
  38 #endif
  39
  40 enum {
  41         OPT_HELP = 1,
  42         OPT_TYPE,
  43         OPT_USERSPACE,
  44         OPT_JUL,
  45         OPT_LOG4J,
  46         OPT_LIST_OPTIONS,
  47         OPT_LIST,
  48 };
  49
  50 static struct lttng_handle *handle;
  51 static struct mi_writer *writer;
  52
  53 /*
  54  * Taken from the LTTng ABI except for "UNKNOWN".
  55  */
  56 enum context_type {
  57         CONTEXT_UNKNOWN = -1,
  58         CONTEXT_PID = 0,
  59         CONTEXT_PERF_COUNTER = 1, /* Backward compat. */
  60         CONTEXT_PROCNAME = 2,
  61         CONTEXT_PRIO = 3,
  62         CONTEXT_NICE = 4,
  63         CONTEXT_VPID = 5,
  64         CONTEXT_TID = 6,
  65         CONTEXT_VTID = 7,
  66         CONTEXT_PPID = 8,
  67         CONTEXT_VPPID = 9,
  68         CONTEXT_PTHREAD_ID = 10,
  69         CONTEXT_HOSTNAME = 11,
  70         CONTEXT_IP = 12,
  71         CONTEXT_PERF_CPU_COUNTER = 13,
  72         CONTEXT_PERF_THREAD_COUNTER = 14,
  73         CONTEXT_APP_CONTEXT = 15,
  74         CONTEXT_INTERRUPTIBLE = 16,
  75         CONTEXT_PREEMPTIBLE = 17,
  76         CONTEXT_NEED_RESCHEDULE = 18,
  77         CONTEXT_MIGRATABLE = 19,
  78         CONTEXT_CALLSTACK_KERNEL = 20,
  79         CONTEXT_CALLSTACK_USER = 21,
  80         CONTEXT_CGROUP_NS = 22,
  81         CONTEXT_IPC_NS = 23,
  82         CONTEXT_MNT_NS = 24,
  83         CONTEXT_NET_NS = 25,
  84         CONTEXT_PID_NS = 26,
  85         CONTEXT_USER_NS = 27,
  86         CONTEXT_UTS_NS = 28,
  87         CONTEXT_UID = 29,
  88         CONTEXT_EUID = 30,
  89         CONTEXT_SUID = 31,
  90         CONTEXT_GID = 32,
  91         CONTEXT_EGID = 33,
  92         CONTEXT_SGID = 34,
  93         CONTEXT_VUID = 35,
  94         CONTEXT_VEUID = 36,
  95         CONTEXT_VSUID = 37,
  96         CONTEXT_VGID = 38,
  97         CONTEXT_VEGID = 39,
  98         CONTEXT_VSGID = 40,
  99         CONTEXT_TIME_NS = 41,
 100 };
 101
 102 /*
 103  * Taken from the Perf ABI (all enum perf_*)
 104  */
 105 enum perf_type {
 106         PERF_TYPE_HARDWARE = 0,
 107         PERF_TYPE_SOFTWARE = 1,
 108         PERF_TYPE_HW_CACHE = 3,
 109         PERF_TYPE_RAW = 4,
 110 };
 111
 112 enum perf_count_hard {
 113         PERF_COUNT_HW_CPU_CYCLES = 0,
 114         PERF_COUNT_HW_INSTRUCTIONS = 1,
 115         PERF_COUNT_HW_CACHE_REFERENCES = 2,
 116         PERF_COUNT_HW_CACHE_MISSES = 3,
 117         PERF_COUNT_HW_BRANCH_INSTRUCTIONS = 4,
 118         PERF_COUNT_HW_BRANCH_MISSES = 5,
 119         PERF_COUNT_HW_BUS_CYCLES = 6,
 120         PERF_COUNT_HW_STALLED_CYCLES_FRONTEND = 7,
 121         PERF_COUNT_HW_STALLED_CYCLES_BACKEND = 8,
 122 };
 123
 124 enum perf_count_soft {
 125         PERF_COUNT_SW_CPU_CLOCK = 0,
 126         PERF_COUNT_SW_TASK_CLOCK = 1,
 127         PERF_COUNT_SW_PAGE_FAULTS = 2,
 128         PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
 129         PERF_COUNT_SW_CPU_MIGRATIONS = 4,
 130         PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
 131         PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
 132         PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
 133         PERF_COUNT_SW_EMULATION_FAULTS = 8,
 134 };
 135
 136 /*
 137  * Generalized hardware cache events:
 138  *
 139  *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
 140  *       { read, write, prefetch } x
 141  *       { accesses, misses }
 142  */
 143 enum perf_hw_cache_id {
 144         PERF_COUNT_HW_CACHE_L1D = 0,
 145         PERF_COUNT_HW_CACHE_L1I = 1,
 146         PERF_COUNT_HW_CACHE_LL = 2,
 147         PERF_COUNT_HW_CACHE_DTLB = 3,
 148         PERF_COUNT_HW_CACHE_ITLB = 4,
 149         PERF_COUNT_HW_CACHE_BPU = 5,
 150
 151         PERF_COUNT_HW_CACHE_MAX, /* non-ABI */
 152 };
 153
 154 enum perf_hw_cache_op_id {
 155         PERF_COUNT_HW_CACHE_OP_READ = 0,
 156         PERF_COUNT_HW_CACHE_OP_WRITE = 1,
 157         PERF_COUNT_HW_CACHE_OP_PREFETCH = 2,
 158
 159         PERF_COUNT_HW_CACHE_OP_MAX, /* non-ABI */
 160 };
 161
 162 enum perf_hw_cache_op_result_id {
 163         PERF_COUNT_HW_CACHE_RESULT_ACCESS = 0,
 164         PERF_COUNT_HW_CACHE_RESULT_MISS = 1,
 165
 166         PERF_COUNT_HW_CACHE_RESULT_MAX, /* non-ABI */
 167 };
 168
 169 static struct poptOption long_options[] = {
 170         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
 171         { "help", 'h', POPT_ARG_NONE, nullptr, OPT_HELP, nullptr, nullptr },
 172         { "session", 's', POPT_ARG_STRING, &opt_session_name, 0, nullptr, nullptr },
 173         { "channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, nullptr, nullptr },
 174         { "kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, nullptr, nullptr },
 175         { "userspace", 'u', POPT_ARG_NONE, nullptr, OPT_USERSPACE, nullptr, nullptr },
 176         { "jul", 'j', POPT_ARG_NONE, nullptr, OPT_JUL, nullptr, nullptr },
 177         { "log4j", 'l', POPT_ARG_NONE, nullptr, OPT_LOG4J, nullptr, nullptr },
 178         { "type", 't', POPT_ARG_STRING, &opt_type, OPT_TYPE, nullptr, nullptr },
 179         { "list", 0, POPT_ARG_NONE, nullptr, OPT_LIST, nullptr, nullptr },
 180         { "list-options", 0, POPT_ARG_NONE, nullptr, OPT_LIST_OPTIONS, nullptr, nullptr },
 181         { nullptr, 0, 0, nullptr, 0, nullptr, nullptr }
 182 };
 183
 184 /*
 185  * Context options
 186  */
 187 #define PERF_HW(optstr, name, type, hide)                \
 188         {                                                \
 189                 optstr, type, PERF_COUNT_HW_##name, hide \
 190         }
 191
 192 #define PERF_SW(optstr, name, type, hide)                \
 193         {                                                \
 194                 optstr, type, PERF_COUNT_SW_##name, hide \
 195         }
 196
 197 #define _PERF_HW_CACHE(optstr, name, type, op, result, hide)                           \
 198         {                                                                              \
 199                 optstr, type, PERF_COUNT_HW_CACHE_##name, PERF_COUNT_HW_CACHE_OP_##op, \
 200                         PERF_COUNT_HW_CACHE_RESULT_##result, hide,                     \
 201         }
 202
 203 #define PERF_HW_CACHE(optstr, name, type, hide)                                           \
 204         _PERF_HW_CACHE(optstr "-loads", name, type, READ, ACCESS, hide),                  \
 205                 _PERF_HW_CACHE(optstr "-load-misses", name, type, READ, MISS, hide),      \
 206                 _PERF_HW_CACHE(optstr "-stores", name, type, WRITE, ACCESS, hide),        \
 207                 _PERF_HW_CACHE(optstr "-store-misses", name, type, WRITE, MISS, hide),    \
 208                 _PERF_HW_CACHE(optstr "-prefetches", name, type, PREFETCH, ACCESS, hide), \
 209                 _PERF_HW_CACHE(optstr "-prefetch-misses", name, type, PREFETCH, MISS, hide)
 210
 211 namespace {
 212 const struct ctx_opts {
 213         /* Needed for end-of-list item. */
 214         ctx_opts() : ctx_opts(nullptr, CONTEXT_UNKNOWN)
 215         {
 216         }
 217
 218         ctx_opts(const char *symbol_, context_type ctx_type_, bool hide_help_ = false) :
 219                 symbol((char *) symbol_), ctx_type(ctx_type_), hide_help(hide_help_)
 220         {
 221         }
 222
 223         ctx_opts(const char *symbol_,
 224                  context_type ctx_type_,
 225                  perf_count_hard perf_count_hard,
 226                  bool hide_help_) :
 227                 ctx_opts(symbol_, ctx_type_, hide_help_)
 228         {
 229                 u.perf.type = PERF_TYPE_HARDWARE;
 230                 u.perf.config = perf_count_hard;
 231         }
 232
 233         ctx_opts(const char *symbol_,
 234                  context_type ctx_type_,
 235                  perf_count_soft perf_count_soft,
 236                  bool hide_help_) :
 237                 ctx_opts(symbol_, ctx_type_, hide_help_)
 238         {
 239                 u.perf.type = PERF_TYPE_SOFTWARE;
 240                 u.perf.config = perf_count_soft;
 241         }
 242
 243         ctx_opts(const char *symbol_,
 244                  context_type ctx_type_,
 245                  perf_hw_cache_id perf_hw_cache_id,
 246                  perf_hw_cache_op_id perf_hw_cache_op_id,
 247                  perf_hw_cache_op_result_id perf_hw_cache_op_result_id,
 248                  bool hide_help_) :
 249                 ctx_opts(symbol_, ctx_type_, hide_help_)
 250         {
 251                 u.perf.type = PERF_TYPE_HW_CACHE;
 252                 u.perf.config = perf_hw_cache_id | perf_hw_cache_op_id << 8 |
 253                         perf_hw_cache_op_result_id << 16;
 254         }
 255
 256         char *symbol;
 257         enum context_type ctx_type;
 258         bool hide_help; /* Hide from --help */
 259         union {
 260                 struct {
 261                         uint32_t type;
 262                         uint64_t config;
 263                 } perf;
 264                 struct {
 265                         char *provider_name;
 266                         char *ctx_name;
 267                 } app_ctx;
 268         } u;
 269 } ctx_opts[] = {
 270         /*
 271          * These (char *) casts (as well as those in the PERF_* macros) are
 272          * safe because we never free these instances of `struct ctx_opts`.
 273          */
 274         { (char *) "pid", CONTEXT_PID },
 275         { (char *) "procname", CONTEXT_PROCNAME },
 276         { (char *) "prio", CONTEXT_PRIO },
 277         { (char *) "nice", CONTEXT_NICE },
 278         { (char *) "vpid", CONTEXT_VPID },
 279         { (char *) "tid", CONTEXT_TID },
 280         { (char *) "pthread_id", CONTEXT_PTHREAD_ID },
 281         { (char *) "vtid", CONTEXT_VTID },
 282         { (char *) "ppid", CONTEXT_PPID },
 283         { (char *) "vppid", CONTEXT_VPPID },
 284         { (char *) "hostname", CONTEXT_HOSTNAME },
 285         { (char *) "ip", CONTEXT_IP },
 286         { (char *) "interruptible", CONTEXT_INTERRUPTIBLE },
 287         { (char *) "preemptible", CONTEXT_PREEMPTIBLE },
 288         { (char *) "need_reschedule", CONTEXT_NEED_RESCHEDULE },
 289         { (char *) "migratable", CONTEXT_MIGRATABLE },
 290         { (char *) "callstack-kernel", CONTEXT_CALLSTACK_KERNEL },
 291 #ifdef HAVE_MODULES_USERSPACE_CALLSTACK_CONTEXT
 292         { (char *) "callstack-user", CONTEXT_CALLSTACK_USER },
 293 #endif
 294         { (char *) "cgroup_ns", CONTEXT_CGROUP_NS },
 295         { (char *) "ipc_ns", CONTEXT_IPC_NS },
 296         { (char *) "mnt_ns", CONTEXT_MNT_NS },
 297         { (char *) "net_ns", CONTEXT_NET_NS },
 298         { (char *) "pid_ns", CONTEXT_PID_NS },
 299         { (char *) "time_ns", CONTEXT_TIME_NS },
 300         { (char *) "user_ns", CONTEXT_USER_NS },
 301         { (char *) "uts_ns", CONTEXT_UTS_NS },
 302         { (char *) "uid", CONTEXT_UID },
 303         { (char *) "euid", CONTEXT_EUID },
 304         { (char *) "suid", CONTEXT_SUID },
 305         { (char *) "gid", CONTEXT_GID },
 306         { (char *) "egid", CONTEXT_EGID },
 307         { (char *) "sgid", CONTEXT_SGID },
 308         { (char *) "vuid", CONTEXT_VUID },
 309         { (char *) "veuid", CONTEXT_VEUID },
 310         { (char *) "vsuid", CONTEXT_VSUID },
 311         { (char *) "vgid", CONTEXT_VGID },
 312         { (char *) "vegid", CONTEXT_VEGID },
 313         { (char *) "vsgid", CONTEXT_VSGID },
 314
 315         /* Perf options */
 316
 317         /* Perf per-CPU counters */
 318         PERF_HW("perf:cpu:cpu-cycles", CPU_CYCLES, CONTEXT_PERF_CPU_COUNTER, 0),
 319         PERF_HW("perf:cpu:cycles", CPU_CYCLES, CONTEXT_PERF_CPU_COUNTER, 0),
 320         PERF_HW("perf:cpu:stalled-cycles-frontend",
 321                 STALLED_CYCLES_FRONTEND,
 322                 CONTEXT_PERF_CPU_COUNTER,
 323                 0),
 324         PERF_HW("perf:cpu:idle-cycles-frontend",
 325                 STALLED_CYCLES_FRONTEND,
 326                 CONTEXT_PERF_CPU_COUNTER,
 327                 0),
 328         PERF_HW("perf:cpu:stalled-cycles-backend",
 329                 STALLED_CYCLES_BACKEND,
 330                 CONTEXT_PERF_CPU_COUNTER,
 331                 0),
 332         PERF_HW("perf:cpu:idle-cycles-backend", STALLED_CYCLES_BACKEND, CONTEXT_PERF_CPU_COUNTER, 0),
 333         PERF_HW("perf:cpu:instructions", INSTRUCTIONS, CONTEXT_PERF_CPU_COUNTER, 0),
 334         PERF_HW("perf:cpu:cache-references", CACHE_REFERENCES, CONTEXT_PERF_CPU_COUNTER, 0),
 335         PERF_HW("perf:cpu:cache-misses", CACHE_MISSES, CONTEXT_PERF_CPU_COUNTER, 0),
 336         PERF_HW("perf:cpu:branch-instructions", BRANCH_INSTRUCTIONS, CONTEXT_PERF_CPU_COUNTER, 0),
 337         PERF_HW("perf:cpu:branches", BRANCH_INSTRUCTIONS, CONTEXT_PERF_CPU_COUNTER, 0),
 338         PERF_HW("perf:cpu:branch-misses", BRANCH_MISSES, CONTEXT_PERF_CPU_COUNTER, 0),
 339         PERF_HW("perf:cpu:bus-cycles", BUS_CYCLES, CONTEXT_PERF_CPU_COUNTER, 0),
 340
 341         PERF_HW_CACHE("perf:cpu:L1-dcache", L1D, CONTEXT_PERF_CPU_COUNTER, 0),
 342         PERF_HW_CACHE("perf:cpu:L1-icache", L1I, CONTEXT_PERF_CPU_COUNTER, 0),
 343         PERF_HW_CACHE("perf:cpu:LLC", LL, CONTEXT_PERF_CPU_COUNTER, 0),
 344         PERF_HW_CACHE("perf:cpu:dTLB", DTLB, CONTEXT_PERF_CPU_COUNTER, 0),
 345         _PERF_HW_CACHE("perf:cpu:iTLB-loads", ITLB, CONTEXT_PERF_CPU_COUNTER, READ, ACCESS, 0),
 346         _PERF_HW_CACHE("perf:cpu:iTLB-load-misses", ITLB, CONTEXT_PERF_CPU_COUNTER, READ, MISS, 0),
 347         _PERF_HW_CACHE("perf:cpu:branch-loads", BPU, CONTEXT_PERF_CPU_COUNTER, READ, ACCESS, 0),
 348         _PERF_HW_CACHE("perf:cpu:branch-load-misses", BPU, CONTEXT_PERF_CPU_COUNTER, READ, MISS, 0),
 349
 350         PERF_SW("perf:cpu:cpu-clock", CPU_CLOCK, CONTEXT_PERF_CPU_COUNTER, 0),
 351         PERF_SW("perf:cpu:task-clock", TASK_CLOCK, CONTEXT_PERF_CPU_COUNTER, 0),
 352         PERF_SW("perf:cpu:page-fault", PAGE_FAULTS, CONTEXT_PERF_CPU_COUNTER, 0),
 353         PERF_SW("perf:cpu:faults", PAGE_FAULTS, CONTEXT_PERF_CPU_COUNTER, 0),
 354         PERF_SW("perf:cpu:major-faults", PAGE_FAULTS_MAJ, CONTEXT_PERF_CPU_COUNTER, 0),
 355         PERF_SW("perf:cpu:minor-faults", PAGE_FAULTS_MIN, CONTEXT_PERF_CPU_COUNTER, 0),
 356         PERF_SW("perf:cpu:context-switches", CONTEXT_SWITCHES, CONTEXT_PERF_CPU_COUNTER, 0),
 357         PERF_SW("perf:cpu:cs", CONTEXT_SWITCHES, CONTEXT_PERF_CPU_COUNTER, 0),
 358         PERF_SW("perf:cpu:cpu-migrations", CPU_MIGRATIONS, CONTEXT_PERF_CPU_COUNTER, 0),
 359         PERF_SW("perf:cpu:migrations", CPU_MIGRATIONS, CONTEXT_PERF_CPU_COUNTER, 0),
 360         PERF_SW("perf:cpu:alignment-faults", ALIGNMENT_FAULTS, CONTEXT_PERF_CPU_COUNTER, 0),
 361         PERF_SW("perf:cpu:emulation-faults", EMULATION_FAULTS, CONTEXT_PERF_CPU_COUNTER, 0),
 362
 363         /* Perf per-thread counters */
 364         PERF_HW("perf:thread:cpu-cycles", CPU_CYCLES, CONTEXT_PERF_THREAD_COUNTER, 0),
 365         PERF_HW("perf:thread:cycles", CPU_CYCLES, CONTEXT_PERF_THREAD_COUNTER, 0),
 366         PERF_HW("perf:thread:stalled-cycles-frontend",
 367                 STALLED_CYCLES_FRONTEND,
 368                 CONTEXT_PERF_THREAD_COUNTER,
 369                 0),
 370         PERF_HW("perf:thread:idle-cycles-frontend",
 371                 STALLED_CYCLES_FRONTEND,
 372                 CONTEXT_PERF_THREAD_COUNTER,
 373                 0),
 374         PERF_HW("perf:thread:stalled-cycles-backend",
 375                 STALLED_CYCLES_BACKEND,
 376                 CONTEXT_PERF_THREAD_COUNTER,
 377                 0),
 378         PERF_HW("perf:thread:idle-cycles-backend",
 379                 STALLED_CYCLES_BACKEND,
 380                 CONTEXT_PERF_THREAD_COUNTER,
 381                 0),
 382         PERF_HW("perf:thread:instructions", INSTRUCTIONS, CONTEXT_PERF_THREAD_COUNTER, 0),
 383         PERF_HW("perf:thread:cache-references", CACHE_REFERENCES, CONTEXT_PERF_THREAD_COUNTER, 0),
 384         PERF_HW("perf:thread:cache-misses", CACHE_MISSES, CONTEXT_PERF_THREAD_COUNTER, 0),
 385         PERF_HW("perf:thread:branch-instructions",
 386                 BRANCH_INSTRUCTIONS,
 387                 CONTEXT_PERF_THREAD_COUNTER,
 388                 0),
 389         PERF_HW("perf:thread:branches", BRANCH_INSTRUCTIONS, CONTEXT_PERF_THREAD_COUNTER, 0),
 390         PERF_HW("perf:thread:branch-misses", BRANCH_MISSES, CONTEXT_PERF_THREAD_COUNTER, 0),
 391         PERF_HW("perf:thread:bus-cycles", BUS_CYCLES, CONTEXT_PERF_THREAD_COUNTER, 0),
 392
 393         PERF_HW_CACHE("perf:thread:L1-dcache", L1D, CONTEXT_PERF_THREAD_COUNTER, 0),
 394         PERF_HW_CACHE("perf:thread:L1-icache", L1I, CONTEXT_PERF_THREAD_COUNTER, 0),
 395         PERF_HW_CACHE("perf:thread:LLC", LL, CONTEXT_PERF_THREAD_COUNTER, 0),
 396         PERF_HW_CACHE("perf:thread:dTLB", DTLB, CONTEXT_PERF_THREAD_COUNTER, 0),
 397         _PERF_HW_CACHE("perf:thread:iTLB-loads", ITLB, CONTEXT_PERF_THREAD_COUNTER, READ, ACCESS, 0),
 398         _PERF_HW_CACHE(
 399                 "perf:thread:iTLB-load-misses", ITLB, CONTEXT_PERF_THREAD_COUNTER, READ, MISS, 0),
 400         _PERF_HW_CACHE(
 401                 "perf:thread:branch-loads", BPU, CONTEXT_PERF_THREAD_COUNTER, READ, ACCESS, 0),
 402         _PERF_HW_CACHE(
 403                 "perf:thread:branch-load-misses", BPU, CONTEXT_PERF_THREAD_COUNTER, READ, MISS, 0),
 404
 405         PERF_SW("perf:thread:cpu-clock", CPU_CLOCK, CONTEXT_PERF_THREAD_COUNTER, 0),
 406         PERF_SW("perf:thread:task-clock", TASK_CLOCK, CONTEXT_PERF_THREAD_COUNTER, 0),
 407         PERF_SW("perf:thread:page-fault", PAGE_FAULTS, CONTEXT_PERF_THREAD_COUNTER, 0),
 408         PERF_SW("perf:thread:faults", PAGE_FAULTS, CONTEXT_PERF_THREAD_COUNTER, 0),
 409         PERF_SW("perf:thread:major-faults", PAGE_FAULTS_MAJ, CONTEXT_PERF_THREAD_COUNTER, 0),
 410         PERF_SW("perf:thread:minor-faults", PAGE_FAULTS_MIN, CONTEXT_PERF_THREAD_COUNTER, 0),
 411         PERF_SW("perf:thread:context-switches", CONTEXT_SWITCHES, CONTEXT_PERF_THREAD_COUNTER, 0),
 412         PERF_SW("perf:thread:cs", CONTEXT_SWITCHES, CONTEXT_PERF_THREAD_COUNTER, 0),
 413         PERF_SW("perf:thread:cpu-migrations", CPU_MIGRATIONS, CONTEXT_PERF_THREAD_COUNTER, 0),
 414         PERF_SW("perf:thread:migrations", CPU_MIGRATIONS, CONTEXT_PERF_THREAD_COUNTER, 0),
 415         PERF_SW("perf:thread:alignment-faults", ALIGNMENT_FAULTS, CONTEXT_PERF_THREAD_COUNTER, 0),
 416         PERF_SW("perf:thread:emulation-faults", EMULATION_FAULTS, CONTEXT_PERF_THREAD_COUNTER, 0),
 417
 418         /*
 419          * Perf per-CPU counters, backward compatibilty for names.
 420          * Hidden from help listing.
 421          */
 422         PERF_HW("perf:cpu-cycles", CPU_CYCLES, CONTEXT_PERF_COUNTER, 1),
 423         PERF_HW("perf:cycles", CPU_CYCLES, CONTEXT_PERF_COUNTER, 1),
 424         PERF_HW("perf:stalled-cycles-frontend", STALLED_CYCLES_FRONTEND, CONTEXT_PERF_COUNTER, 1),
 425         PERF_HW("perf:idle-cycles-frontend", STALLED_CYCLES_FRONTEND, CONTEXT_PERF_COUNTER, 1),
 426         PERF_HW("perf:stalled-cycles-backend", STALLED_CYCLES_BACKEND, CONTEXT_PERF_COUNTER, 1),
 427         PERF_HW("perf:idle-cycles-backend", STALLED_CYCLES_BACKEND, CONTEXT_PERF_COUNTER, 1),
 428         PERF_HW("perf:instructions", INSTRUCTIONS, CONTEXT_PERF_COUNTER, 1),
 429         PERF_HW("perf:cache-references", CACHE_REFERENCES, CONTEXT_PERF_COUNTER, 1),
 430         PERF_HW("perf:cache-misses", CACHE_MISSES, CONTEXT_PERF_COUNTER, 1),
 431         PERF_HW("perf:branch-instructions", BRANCH_INSTRUCTIONS, CONTEXT_PERF_COUNTER, 1),
 432         PERF_HW("perf:branches", BRANCH_INSTRUCTIONS, CONTEXT_PERF_COUNTER, 1),
 433         PERF_HW("perf:branch-misses", BRANCH_MISSES, CONTEXT_PERF_COUNTER, 1),
 434         PERF_HW("perf:bus-cycles", BUS_CYCLES, CONTEXT_PERF_COUNTER, 1),
 435
 436         PERF_HW_CACHE("perf:L1-dcache", L1D, CONTEXT_PERF_COUNTER, 1),
 437         PERF_HW_CACHE("perf:L1-icache", L1I, CONTEXT_PERF_COUNTER, 1),
 438         PERF_HW_CACHE("perf:LLC", LL, CONTEXT_PERF_COUNTER, 1),
 439         PERF_HW_CACHE("perf:dTLB", DTLB, CONTEXT_PERF_COUNTER, 1),
 440         _PERF_HW_CACHE("perf:iTLB-loads", ITLB, CONTEXT_PERF_COUNTER, READ, ACCESS, 1),
 441         _PERF_HW_CACHE("perf:iTLB-load-misses", ITLB, CONTEXT_PERF_COUNTER, READ, MISS, 1),
 442         _PERF_HW_CACHE("perf:branch-loads", BPU, CONTEXT_PERF_COUNTER, READ, ACCESS, 1),
 443         _PERF_HW_CACHE("perf:branch-load-misses", BPU, CONTEXT_PERF_COUNTER, READ, MISS, 1),
 444
 445         PERF_SW("perf:cpu-clock", CPU_CLOCK, CONTEXT_PERF_COUNTER, 1),
 446         PERF_SW("perf:task-clock", TASK_CLOCK, CONTEXT_PERF_COUNTER, 1),
 447         PERF_SW("perf:page-fault", PAGE_FAULTS, CONTEXT_PERF_COUNTER, 1),
 448         PERF_SW("perf:faults", PAGE_FAULTS, CONTEXT_PERF_COUNTER, 1),
 449         PERF_SW("perf:major-faults", PAGE_FAULTS_MAJ, CONTEXT_PERF_COUNTER, 1),
 450         PERF_SW("perf:minor-faults", PAGE_FAULTS_MIN, CONTEXT_PERF_COUNTER, 1),
 451         PERF_SW("perf:context-switches", CONTEXT_SWITCHES, CONTEXT_PERF_COUNTER, 1),
 452         PERF_SW("perf:cs", CONTEXT_SWITCHES, CONTEXT_PERF_COUNTER, 1),
 453         PERF_SW("perf:cpu-migrations", CPU_MIGRATIONS, CONTEXT_PERF_COUNTER, 1),
 454         PERF_SW("perf:migrations", CPU_MIGRATIONS, CONTEXT_PERF_COUNTER, 1),
 455         PERF_SW("perf:alignment-faults", ALIGNMENT_FAULTS, CONTEXT_PERF_COUNTER, 1),
 456         PERF_SW("perf:emulation-faults", EMULATION_FAULTS, CONTEXT_PERF_COUNTER, 1),
 457
 458         {}, /* Closure */
 459 };
 460
 461 #undef PERF_HW_CACHE
 462 #undef _PERF_HW_CACHE
 463 #undef PERF_SW
 464 #undef PERF_HW
 465
 466 /*
 467  * Context type for command line option parsing.
 468  */
 469 struct ctx_type {
 470         struct ctx_opts *opt;
 471         struct cds_list_head list;
 472 };
 473
 474 /*
 475  * List of context type. Use to enable multiple context on a single command
 476  * line entry.
 477  */
 478 struct ctx_type_list {
 479         struct cds_list_head head;
 480 } ctx_type_list = {
 481         .head = CDS_LIST_HEAD_INIT(ctx_type_list.head),
 482 };
 483 } /* namespace */
 484
 485 /*
 486  * Find context numerical value from string.
 487  *
 488  * Return -1 if not found.
 489  */
 490 static int find_ctx_type_idx(const char *opt)
 491 {
 492         int ret, i = 0;
 493
 494         while (ctx_opts[i].symbol != nullptr) {
 495                 if (strcmp(opt, ctx_opts[i].symbol) == 0) {
 496                         ret = i;
 497                         goto end;
 498                 }
 499                 i++;
 500         }
 501
 502         ret = -1;
 503 end:
 504         return ret;
 505 }
 506
 507 static enum lttng_domain_type get_domain()
 508 {
 509         if (opt_kernel) {
 510                 return LTTNG_DOMAIN_KERNEL;
 511         } else if (opt_userspace) {
 512                 return LTTNG_DOMAIN_UST;
 513         } else if (opt_jul) {
 514                 return LTTNG_DOMAIN_JUL;
 515         } else if (opt_log4j) {
 516                 return LTTNG_DOMAIN_LOG4J;
 517         } else {
 518                 abort();
 519         }
 520 }
 521
 522 static int mi_open()
 523 {
 524         int ret;
 525
 526         /* MI check */
 527         if (!lttng_opt_mi) {
 528                 ret = 0;
 529                 goto end;
 530         }
 531
 532         ret = fileno(stdout);
 533         if (ret < 0) {
 534                 PERROR("Unable to retrieve fileno of stdout");
 535                 ret = CMD_ERROR;
 536                 goto end;
 537         }
 538
 539         writer = mi_lttng_writer_create(ret, lttng_opt_mi);
 540         if (!writer) {
 541                 ret = CMD_ERROR;
 542                 goto end;
 543         }
 544
 545         /* Open command element */
 546         ret = mi_lttng_writer_command_open(writer, mi_lttng_element_command_add_context);
 547         if (ret) {
 548                 ret = CMD_ERROR;
 549                 goto end;
 550         }
 551
 552         /* Open output element */
 553         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command_output);
 554         if (ret) {
 555                 ret = CMD_ERROR;
 556                 goto end;
 557         }
 558 end:
 559         return ret;
 560 }
 561
 562 static int mi_close(enum cmd_error_code success)
 563 {
 564         int ret;
 565
 566         /* MI closing */
 567         if (!lttng_opt_mi) {
 568                 ret = 0;
 569                 goto end;
 570         }
 571         /* Close  output element */
 572         ret = mi_lttng_writer_close_element(writer);
 573         if (ret) {
 574                 ret = CMD_ERROR;
 575                 goto end;
 576         }
 577
 578         /* Success ? */
 579         ret = mi_lttng_writer_write_element_bool(
 580                 writer, mi_lttng_element_command_success, !success);
 581         if (ret) {
 582                 ret = CMD_ERROR;
 583                 goto end;
 584         }
 585
 586         /* Command element close */
 587         ret = mi_lttng_writer_command_close(writer);
 588         if (ret) {
 589                 ret = CMD_ERROR;
 590                 goto end;
 591         }
 592 end:
 593         return ret;
 594 }
 595
 596 static void populate_context(struct lttng_event_context *context, const struct ctx_opts *opt)
 597 {
 598         char *ptr;
 599
 600         context->ctx = (enum lttng_event_context_type) opt->ctx_type;
 601         switch (context->ctx) {
 602         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
 603         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
 604         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
 605                 context->u.perf_counter.type = opt->u.perf.type;
 606                 context->u.perf_counter.config = opt->u.perf.config;
 607                 strncpy(context->u.perf_counter.name, opt->symbol, LTTNG_SYMBOL_NAME_LEN);
 608                 context->u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 609                 /* Replace : and - by _ */
 610                 while ((ptr = strchr(context->u.perf_counter.name, '-')) != nullptr) {
 611                         *ptr = '_';
 612                 }
 613                 while ((ptr = strchr(context->u.perf_counter.name, ':')) != nullptr) {
 614                         *ptr = '_';
 615                 }
 616                 break;
 617         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
 618                 context->u.app_ctx.provider_name = opt->u.app_ctx.provider_name;
 619                 context->u.app_ctx.ctx_name = opt->u.app_ctx.ctx_name;
 620                 break;
 621         default:
 622                 break;
 623         }
 624 }
 625
 626 /*
 627  * Pretty print context type.
 628  */
 629 static int print_ctx_type()
 630 {
 631         FILE *ofp = stdout;
 632         int i = 0;
 633         int ret;
 634         struct lttng_event_context context;
 635
 636         memset(&context, 0, sizeof(context));
 637
 638         ret = mi_open();
 639         if (ret) {
 640                 ret = CMD_ERROR;
 641                 goto end;
 642         }
 643
 644         if (lttng_opt_mi) {
 645                 /* Open a contexts element */
 646                 ret = mi_lttng_writer_open_element(writer, config_element_contexts);
 647                 if (ret) {
 648                         ret = CMD_ERROR;
 649                         goto end;
 650                 }
 651         }
 652
 653         while (ctx_opts[i].symbol != nullptr) {
 654                 if (!ctx_opts[i].hide_help) {
 655                         if (lttng_opt_mi) {
 656                                 populate_context(&context, &ctx_opts[i]);
 657                                 ret = mi_lttng_context(writer, &context, 1);
 658                                 if (ret) {
 659                                         ret = CMD_ERROR;
 660                                         goto end;
 661                                 }
 662
 663                                 ret = mi_lttng_writer_write_element_string(
 664                                         writer,
 665                                         mi_lttng_element_context_symbol,
 666                                         ctx_opts[i].symbol);
 667                                 if (ret) {
 668                                         ret = CMD_ERROR;
 669                                         goto end;
 670                                 }
 671
 672                                 ret = mi_lttng_writer_close_element(writer);
 673                                 if (ret) {
 674                                         ret = CMD_ERROR;
 675                                         goto end;
 676                                 }
 677                         } else {
 678                                 fprintf(ofp, "%s\n", ctx_opts[i].symbol);
 679                         }
 680                 }
 681                 i++;
 682         }
 683
 684         if (lttng_opt_mi) {
 685                 /* Close contexts element */
 686                 ret = mi_lttng_writer_close_element(writer);
 687                 if (ret) {
 688                         goto end;
 689                 }
 690         }
 691
 692 end:
 693         ret = mi_close((cmd_error_code) ret);
 694         if (ret) {
 695                 ret = CMD_ERROR;
 696         }
 697         return ret;
 698 }
 699
 700 /*
 701  * Add context to channel or event.
 702  */
 703 static int add_context(char *session_name)
 704 {
 705         int ret = CMD_SUCCESS, warn = 0, success = 0;
 706         struct lttng_event_context context;
 707         struct lttng_domain dom;
 708         struct ctx_type *type;
 709
 710         memset(&context, 0, sizeof(context));
 711         memset(&dom, 0, sizeof(dom));
 712
 713         dom.type = get_domain();
 714         handle = lttng_create_handle(session_name, &dom);
 715         if (handle == nullptr) {
 716                 ret = CMD_ERROR;
 717                 goto error;
 718         }
 719
 720         if (lttng_opt_mi) {
 721                 /* Open a contexts element */
 722                 ret = mi_lttng_writer_open_element(writer, config_element_contexts);
 723                 if (ret) {
 724                         goto error;
 725                 }
 726         }
 727
 728         /* Iterate over all the context types given */
 729         cds_list_for_each_entry (type, &ctx_type_list.head, list) {
 730                 DBG("Adding context...");
 731
 732                 populate_context(&context, type->opt);
 733
 734                 if (lttng_opt_mi) {
 735                         /* We leave context open the update the success of the command */
 736                         ret = mi_lttng_context(writer, &context, 1);
 737                         if (ret) {
 738                                 ret = CMD_ERROR;
 739                                 goto error;
 740                         }
 741
 742                         ret = mi_lttng_writer_write_element_string(
 743                                 writer, mi_lttng_element_context_symbol, type->opt->symbol);
 744                         if (ret) {
 745                                 ret = CMD_ERROR;
 746                                 goto error;
 747                         }
 748                 }
 749
 750                 ret = lttng_add_context(handle, &context, nullptr, opt_channel_name);
 751                 if (ret < 0) {
 752                         ERR("%s: %s", type->opt->symbol, lttng_strerror(ret));
 753                         warn = 1;
 754                         success = 0;
 755                 } else {
 756                         if (opt_channel_name) {
 757                                 MSG("%s context %s added to channel %s",
 758                                     lttng_domain_type_str(dom.type),
 759                                     type->opt->symbol,
 760                                     opt_channel_name);
 761                         } else {
 762                                 MSG("%s context %s added to all channels",
 763                                     lttng_domain_type_str(dom.type),
 764                                     type->opt->symbol);
 765                         }
 766                         success = 1;
 767                 }
 768
 769                 if (lttng_opt_mi) {
 770                         /* Is the single operation a success ? */
 771                         ret = mi_lttng_writer_write_element_bool(
 772                                 writer, mi_lttng_element_success, success);
 773                         if (ret) {
 774                                 ret = CMD_ERROR;
 775                                 goto error;
 776                         }
 777
 778                         /* Close the context element */
 779                         ret = mi_lttng_writer_close_element(writer);
 780                         if (ret) {
 781                                 ret = CMD_ERROR;
 782                                 goto error;
 783                         }
 784                 }
 785         }
 786
 787         if (lttng_opt_mi) {
 788                 /* Close contexts element */
 789                 ret = mi_lttng_writer_close_element(writer);
 790                 if (ret) {
 791                         goto error;
 792                 }
 793         }
 794
 795         ret = CMD_SUCCESS;
 796
 797 error:
 798         lttng_destroy_handle(handle);
 799
 800         /*
 801          * This means that at least one add_context failed and tells the user to
 802          * look on stderr for error(s).
 803          */
 804         if (!ret && warn) {
 805                 ret = CMD_WARNING;
 806         }
 807         return ret;
 808 }
 809
 810 static void destroy_ctx_type(struct ctx_type *type)
 811 {
 812         if (!type) {
 813                 return;
 814         }
 815         if (type->opt) {
 816                 free(type->opt->symbol);
 817         }
 818         delete type->opt;
 819         free(type);
 820 }
 821
 822 static struct ctx_type *create_ctx_type()
 823 {
 824         struct ctx_type *type = zmalloc<ctx_type>();
 825
 826         if (!type) {
 827                 PERROR("malloc ctx_type");
 828                 goto end;
 829         }
 830
 831         type->opt = new struct ctx_opts;
 832         if (!type->opt) {
 833                 PERROR("malloc ctx_type options");
 834                 destroy_ctx_type(type);
 835                 type = nullptr;
 836                 goto end;
 837         }
 838 end:
 839         return type;
 840 }
 841
 842 static int find_ctx_type_perf_raw(const char *ctx, struct ctx_type *type)
 843 {
 844         int ret;
 845         int field_pos = 0;
 846         char *tmp_list, *cur_list;
 847
 848         cur_list = tmp_list = strdup(ctx);
 849         if (!tmp_list) {
 850                 PERROR("strdup temp list");
 851                 ret = -ENOMEM;
 852                 goto end;
 853         }
 854
 855         /* Looking for "perf:[cpu|thread]:raw:<mask>:<name>". */
 856         for (;;) {
 857                 char *next;
 858
 859                 next = strtok(cur_list, ":");
 860                 if (!next) {
 861                         break;
 862                 }
 863                 cur_list = nullptr;
 864                 switch (field_pos) {
 865                 case 0:
 866                         if (strncmp(next, "perf", 4) != 0) {
 867                                 ret = -1;
 868                                 goto end;
 869                         }
 870                         break;
 871                 case 1:
 872                         if (strncmp(next, "cpu", 3) == 0) {
 873                                 type->opt->ctx_type = CONTEXT_PERF_CPU_COUNTER;
 874                         } else if (strncmp(next, "thread", 4) == 0) {
 875                                 type->opt->ctx_type = CONTEXT_PERF_THREAD_COUNTER;
 876                         } else {
 877                                 ret = -1;
 878                                 goto end;
 879                         }
 880                         break;
 881                 case 2:
 882                         if (strncmp(next, "raw", 3) != 0) {
 883                                 ret = -1;
 884                                 goto end;
 885                         }
 886                         break;
 887                 case 3:
 888                 {
 889                         char *endptr;
 890
 891                         if (strlen(next) < 2 || next[0] != 'r') {
 892                                 ERR("Wrong perf raw mask format: expected rNNN");
 893                                 ret = -1;
 894                                 goto end;
 895                         }
 896                         errno = 0;
 897                         type->opt->u.perf.config = strtoll(next + 1, &endptr, 16);
 898                         if (errno != 0 || !endptr || *endptr) {
 899                                 ERR("Wrong perf raw mask format: expected rNNN");
 900                                 ret = -1;
 901                                 goto end;
 902                         }
 903                         break;
 904                 }
 905                 case 4:
 906                         /* name */
 907                         break;
 908                 case 5:
 909                         ERR("Too many ':' in perf raw format");
 910                         ret = -1;
 911                         goto end;
 912                 };
 913                 field_pos++;
 914         }
 915
 916         if (field_pos < 5) {
 917                 ERR("Invalid perf counter specifier, expected a specifier of "
 918                     "the form perf:cpu:raw:rNNN:<name> or "
 919                     "perf:thread:raw:rNNN:<name>");
 920                 ret = -1;
 921                 goto end;
 922         }
 923
 924         ret = 0;
 925         goto end;
 926
 927 end:
 928         free(tmp_list);
 929         return ret;
 930 }
 931
 932 static struct ctx_type *get_context_type(const char *ctx)
 933 {
 934         int opt_index, ret;
 935         struct ctx_type *type = nullptr;
 936         const char app_ctx_prefix[] = "$app.";
 937         char *provider_name = nullptr, *ctx_name = nullptr;
 938         size_t i, len, colon_pos = 0, provider_name_len, ctx_name_len;
 939
 940         if (!ctx) {
 941                 goto not_found;
 942         }
 943
 944         type = create_ctx_type();
 945         if (!type) {
 946                 goto not_found;
 947         }
 948
 949         /* Check if ctx matches a known static context. */
 950         opt_index = find_ctx_type_idx(ctx);
 951         if (opt_index >= 0) {
 952                 *type->opt = ctx_opts[opt_index];
 953                 type->opt->symbol = strdup(ctx_opts[opt_index].symbol);
 954                 goto found;
 955         }
 956
 957         /* Check if ctx is a raw perf context. */
 958         ret = find_ctx_type_perf_raw(ctx, type);
 959         if (ret == 0) {
 960                 type->opt->u.perf.type = PERF_TYPE_RAW;
 961                 type->opt->symbol = strdup(ctx);
 962                 if (!type->opt->symbol) {
 963                         PERROR("Copy perf field name");
 964                         goto not_found;
 965                 }
 966                 goto found;
 967         }
 968
 969         /*
 970          * No match found against static contexts; check if it is an app
 971          * context.
 972          */
 973         len = strlen(ctx);
 974         if (len <= sizeof(app_ctx_prefix) - 1) {
 975                 goto not_found;
 976         }
 977
 978         /* String starts with $app. */
 979         if (strncmp(ctx, app_ctx_prefix, sizeof(app_ctx_prefix) - 1) != 0) {
 980                 goto not_found;
 981         }
 982
 983         /* Validate that the ':' separator is present. */
 984         for (i = sizeof(app_ctx_prefix); i < len; i++) {
 985                 const char c = ctx[i];
 986
 987                 if (c == ':') {
 988                         colon_pos = i;
 989                         break;
 990                 }
 991         }
 992
 993         /*
 994          * No colon found or no ctx name ("$app.provider:") or no provider name
 995          * given ("$app.:..."), which is invalid.
 996          */
 997         if (!colon_pos || colon_pos == len || colon_pos == sizeof(app_ctx_prefix)) {
 998                 ERR("Invalid application context provided: no provider or context name provided.");
 999                 goto not_found;
1000         }
1001
1002         provider_name_len = colon_pos - sizeof(app_ctx_prefix) + 2;
1003         provider_name = calloc<char>(provider_name_len);
1004         if (!provider_name) {
1005                 PERROR("malloc provider_name");
1006                 goto not_found;
1007         }
1008         strncpy(provider_name, ctx + sizeof(app_ctx_prefix) - 1, provider_name_len - 1);
1009         type->opt->u.app_ctx.provider_name = provider_name;
1010
1011         ctx_name_len = len - colon_pos;
1012         ctx_name = calloc<char>(ctx_name_len);
1013         if (!ctx_name) {
1014                 PERROR("malloc ctx_name");
1015                 goto not_found;
1016         }
1017         strncpy(ctx_name, ctx + colon_pos + 1, ctx_name_len - 1);
1018         type->opt->u.app_ctx.ctx_name = ctx_name;
1019         type->opt->ctx_type = CONTEXT_APP_CONTEXT;
1020         type->opt->symbol = strdup(ctx);
1021 found:
1022         return type;
1023 not_found:
1024         free(provider_name);
1025         free(ctx_name);
1026         destroy_ctx_type(type);
1027         return nullptr;
1028 }
1029
1030 /*
1031  * Add context to channel or event.
1032  */
1033 int cmd_add_context(int argc, const char **argv)
1034 {
1035         int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS;
1036         static poptContext pc;
1037         struct ctx_type *type, *tmptype;
1038         char *session_name = nullptr;
1039         const char *leftover = nullptr;
1040
1041         if (argc < 2) {
1042                 ret = CMD_ERROR;
1043                 goto end;
1044         }
1045
1046         pc = poptGetContext(nullptr, argc, argv, long_options, 0);
1047         poptReadDefaultConfig(pc, 0);
1048
1049         while ((opt = poptGetNextOpt(pc)) != -1) {
1050                 switch (opt) {
1051                 case OPT_HELP:
1052                         SHOW_HELP();
1053                         goto end;
1054                 case OPT_LIST:
1055                         ret = print_ctx_type();
1056                         goto end;
1057                 case OPT_TYPE:
1058                 {
1059                         type = get_context_type(opt_type);
1060                         if (!type) {
1061                                 ERR("Unknown context type %s", opt_type);
1062                                 ret = CMD_FATAL;
1063                                 goto end;
1064                         }
1065                         cds_list_add_tail(&type->list, &ctx_type_list.head);
1066                         break;
1067                 }
1068                 case OPT_USERSPACE:
1069                         opt_userspace = 1;
1070                         break;
1071                 case OPT_JUL:
1072                         opt_jul = 1;
1073                         break;
1074                 case OPT_LOG4J:
1075                         opt_log4j = 1;
1076                         break;
1077                 case OPT_LIST_OPTIONS:
1078                         list_cmd_options(stdout, long_options);
1079                         goto end;
1080                 default:
1081                         ret = CMD_UNDEFINED;
1082                         goto end;
1083                 }
1084         }
1085
1086         leftover = poptGetArg(pc);
1087         if (leftover) {
1088                 ERR("Unknown argument: %s", leftover);
1089                 ret = CMD_ERROR;
1090                 goto end;
1091         }
1092
1093         ret = print_missing_or_multiple_domains(opt_kernel + opt_userspace + opt_jul + opt_log4j,
1094                                                 true);
1095         if (ret) {
1096                 ret = CMD_ERROR;
1097                 goto end;
1098         }
1099
1100         if (!opt_type) {
1101                 ERR("Missing mandatory -t TYPE");
1102                 ret = CMD_ERROR;
1103                 goto end;
1104         }
1105
1106         if (!opt_session_name) {
1107                 session_name = get_session_name();
1108                 if (session_name == nullptr) {
1109                         ret = CMD_ERROR;
1110                         goto end;
1111                 }
1112         } else {
1113                 session_name = opt_session_name;
1114         }
1115
1116         ret = mi_open();
1117         if (ret) {
1118                 goto end;
1119         }
1120
1121         command_ret = add_context(session_name);
1122         ret = mi_close((cmd_error_code) command_ret);
1123         if (ret) {
1124                 goto end;
1125         }
1126
1127 end:
1128         if (!opt_session_name) {
1129                 free(session_name);
1130         }
1131
1132         /* Mi clean-up */
1133         if (writer && mi_lttng_writer_destroy(writer)) {
1134                 /* Preserve original error code */
1135                 ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
1136         }
1137
1138         /* Cleanup allocated memory */
1139         cds_list_for_each_entry_safe (type, tmptype, &ctx_type_list.head, list) {
1140                 destroy_ctx_type(type);
1141         }
1142
1143         /* Overwrite ret if an error occurred during add_context() */
1144         ret = command_ret ? command_ret : ret;
1145
1146         poptFreeContext(pc);
1147         return ret;
1148 }