lttng-sessiond/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         /* The following fields are used internally within UST. */
  45         int shm_fd;
  46         int wait_fd;
  47         uint64_t memory_map_size;
  48 };
  49
  50 /*
  51  * This structure is only used internally within UST. It is not per-se
  52  * part of the communication between sessiond and UST.
  53  */
  54 struct lttng_ust_stream {
  55         int shm_fd;
  56         int wait_fd;
  57         uint64_t memory_map_size;
  58 };
  59
  60 struct lttng_ust_event {
  61         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
  62         enum lttng_ust_instrumentation instrumentation;
  63         /* Per instrumentation type configuration */
  64         union {
  65         } u;
  66 };
  67
  68 enum lttng_ust_context_type {
  69         LTTNG_UST_CONTEXT_VTID                  = 0,
  70         LTTNG_UST_CONTEXT_VPID                  = 1,
  71         LTTNG_UST_CONTEXT_PTHREAD_ID            = 2,
  72         LTTNG_UST_CONTEXT_PROCNAME              = 3,
  73 };
  74
  75 struct lttng_ust_context {
  76         enum lttng_ust_context_type ctx;
  77         union {
  78         } u;
  79 };
  80
  81 /*
  82  * Tracer channel attributes.
  83  */
  84 struct lttng_ust_channel_attr {
  85         int overwrite;                          /* 1: overwrite, 0: discard */
  86         uint64_t subbuf_size;                   /* bytes */
  87         uint64_t num_subbuf;                    /* power of 2 */
  88         unsigned int switch_timer_interval;     /* usec */
  89         unsigned int read_timer_interval;       /* usec */
  90         enum lttng_ust_output output;           /* splice, mmap */
  91 };
  92
  93 struct lttng_ust_object_data {
  94         int handle;
  95         int shm_fd;
  96         int wait_fd;
  97         uint64_t memory_map_size;
  98 };
  99
 100 #define _UST_CMD(minor)                         (minor)
 101 #define _UST_CMDR(minor, type)                  (minor)
 102 #define _UST_CMDW(minor, type)                  (minor)
 103
 104 /* Handled by object descriptor */
 105 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
 106
 107 /* Handled by object cmd */
 108
 109 /* LTTng-UST commands */
 110 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
 111 #define LTTNG_UST_TRACER_VERSION                \
 112         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
 113 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
 114 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
 115 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
 116
 117 /* Session FD commands */
 118 #define LTTNG_UST_METADATA                      \
 119         _UST_CMDW(0x50, struct lttng_ust_channel)
 120 #define LTTNG_UST_CHANNEL                       \
 121         _UST_CMDW(0x51, struct lttng_ust_channel)
 122 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
 123 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
 124
 125 /* Channel FD commands */
 126 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 127 #define LTTNG_UST_EVENT                 \
 128         _UST_CMDW(0x61, struct lttng_ust_event)
 129
 130 /* Event and Channel FD commands */
 131 #define LTTNG_UST_CONTEXT                       \
 132         _UST_CMDW(0x70, struct lttng_ust_context)
 133 #define LTTNG_UST_FLUSH_BUFFER                  \
 134         _UST_CMD(0x71)
 135
 136 /* Event, Channel and Session commands */
 137 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 138 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 139
 140 /* Tracepoint list commands */
 141 #define LTTNG_UST_TRACEPOINT_LIST_GET           _UST_CMD(0x90)
 142
 143 #define LTTNG_UST_ROOT_HANDLE   0
 144
 145 struct lttng_ust_obj;
 146
 147 struct lttng_ust_objd_ops {
 148         long (*cmd)(int objd, unsigned int cmd, unsigned long arg);
 149         int (*release)(int objd);
 150 };
 151
 152 /* Create root handle. Always ID 0. */
 153 int lttng_abi_create_root_handle(void);
 154
 155 const struct lttng_ust_objd_ops *objd_ops(int id);
 156 int lttng_ust_objd_unref(int id);
 157
 158 void lttng_ust_abi_exit(void);
 159 void lttng_ust_events_exit(void);
 160
 161 #endif /* _LTTNG_UST_ABI_H */