include/ust/lttng-ust-abi.h

   1 #ifndef _LTTNG_UST_ABI_H
   2 #define _LTTNG_UST_ABI_H
   3
   4 /*
   5  * lttng-ust-abi.h
   6  *
   7  * Copyright 2010-2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * LTTng-UST ABI header
  10  *
  11  * Dual LGPL v2.1/GPL v2 license.
  12  */
  13
  14 #include <stdint.h>
  15
  16 #define LTTNG_UST_SYM_NAME_LEN  128
  17
  18 #define LTTNG_UST_COMM_VERSION_MAJOR            0
  19 #define LTTNG_UST_COMM_VERSION_MINOR            1
  20
  21 enum lttng_ust_instrumentation {
  22         LTTNG_UST_TRACEPOINT    = 0,
  23         LTTNG_UST_PROBE         = 1,
  24         LTTNG_UST_FUNCTION      = 2,
  25 };
  26
  27 enum lttng_ust_output {
  28         LTTNG_UST_MMAP          = 0,
  29 };
  30
  31 struct lttng_ust_tracer_version {
  32         uint32_t version;
  33         uint32_t patchlevel;
  34         uint32_t sublevel;
  35 };
  36
  37 struct lttng_ust_channel {
  38         int overwrite;                          /* 1: overwrite, 0: discard */
  39         uint64_t subbuf_size;                   /* in bytes */
  40         uint64_t num_subbuf;
  41         unsigned int switch_timer_interval;     /* usecs */
  42         unsigned int read_timer_interval;       /* usecs */
  43         enum lttng_ust_output output;           /* output mode */
  44 };
  45
  46 /*
  47  * This structure is only used internally within UST. It is not per-se
  48  * part of the communication between sessiond and UST.
  49  */
  50 struct lttng_ust_stream {
  51         int shm_fd;
  52         int wait_fd;
  53         uint64_t memory_map_size;
  54 };
  55
  56 struct lttng_ust_event {
  57         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
  58         enum lttng_ust_instrumentation instrumentation;
  59         /* Per instrumentation type configuration */
  60         union {
  61         } u;
  62 };
  63
  64 enum lttng_ust_context_type {
  65         LTTNG_UST_CONTEXT_VTID                  = 0,
  66 };
  67
  68 struct lttng_ust_context {
  69         enum lttng_ust_context_type ctx;
  70         union {
  71         } u;
  72 };
  73
  74 #define _UST_CMD(minor)                         (minor)
  75 #define _UST_CMDR(minor, type)                  (minor)
  76 #define _UST_CMDW(minor, type)                  (minor)
  77
  78 /* Handled by object descriptor */
  79 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
  80
  81 /* Handled by object cmd */
  82
  83 /* LTTng-UST commands */
  84 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
  85 #define LTTNG_UST_TRACER_VERSION                \
  86         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
  87 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
  88 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
  89 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
  90
  91 /* Session FD commands */
  92 #define LTTNG_UST_METADATA                      \
  93         _UST_CMDW(0x50, struct lttng_ust_channel)
  94 #define LTTNG_UST_CHANNEL                       \
  95         _UST_CMDW(0x51, struct lttng_ust_channel)
  96 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
  97 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
  98
  99 /* Channel FD commands */
 100 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 101 #define LTTNG_UST_EVENT                 \
 102         _UST_CMDW(0x61, struct lttng_ust_event)
 103
 104 /* Event and Channel FD commands */
 105 #define LTTNG_UST_CONTEXT                       \
 106         _UST_CMDW(0x70, struct lttng_ust_context)
 107
 108 /* Event, Channel and Session commands */
 109 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 110 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 111
 112 #define LTTNG_UST_ROOT_HANDLE   0
 113
 114 struct obj;
 115
 116 struct objd_ops {
 117         long (*cmd)(int objd, unsigned int cmd, unsigned long arg);
 118         int (*release)(int objd);
 119 };
 120
 121 /* Create root handle. Always ID 0. */
 122 int lttng_abi_create_root_handle(void);
 123
 124 const struct objd_ops *objd_ops(int id);
 125 int objd_unref(int id);
 126
 127 void lttng_ust_abi_exit(void);
 128 void ltt_events_exit(void);
 129
 130 #endif /* _LTTNG_UST_ABI_H */