include/lttng/lttng-ustconsumer.h

   1 /*
   2  * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
   3  * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; only version 2
   8  * of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifndef _LTTNG_USTCONSUMER_H
  21 #define _LTTNG_USTCONSUMER_H
  22
  23 #include <config.h>
  24 #include <lttng/lttng-consumer.h>
  25 #include <errno.h>
  26
  27 #ifdef HAVE_LIBLTTNG_UST_CTL
  28
  29 /*
  30  * Mmap the ring buffer, read it and write the data to the tracefile.
  31  *
  32  * Returns the number of bytes written.
  33  */
  34 extern int lttng_ustconsumer_on_read_subbuffer_mmap(
  35                 struct lttng_consumer_local_data *ctx,
  36                 struct lttng_consumer_stream *stream, unsigned long len);
  37
  38 /* Not implemented */
  39 extern int lttng_ustconsumer_on_read_subbuffer_splice(
  40                 struct lttng_consumer_local_data *ctx,
  41                 struct lttng_consumer_stream *stream, unsigned long len);
  42
  43 /*
  44  * Take a snapshot for a specific fd
  45  *
  46  * Returns 0 on success, < 0 on error
  47  */
  48 int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
  49         struct lttng_consumer_stream *stream);
  50
  51 /*
  52  * Get the produced position
  53  *
  54  * Returns 0 on success, < 0 on error
  55  */
  56 int lttng_ustconsumer_get_produced_snapshot(
  57         struct lttng_consumer_local_data *ctx,
  58         struct lttng_consumer_stream *stream,
  59         unsigned long *pos);
  60
  61 int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
  62                 int sock, struct pollfd *consumer_sockpoll);
  63
  64 extern int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan);
  65 extern void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan);
  66 extern int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream);
  67 extern void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream);
  68
  69 int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
  70                 struct lttng_consumer_local_data *ctx);
  71 int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream);
  72
  73 void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream);
  74
  75 #else /* HAVE_LIBLTTNG_UST_CTL */
  76
  77 static inline
  78 int lttng_ustconsumer_on_read_subbuffer_mmap(
  79                 struct lttng_consumer_local_data *ctx,
  80                 struct lttng_consumer_stream *stream, unsigned long len)
  81 {
  82         return -ENOSYS;
  83 }
  84
  85 static inline
  86 int lttng_ustconsumer_on_read_subbuffer_splice(
  87                 struct lttng_consumer_local_data *ctx,
  88                 struct lttng_consumer_stream *uststream, unsigned long len)
  89 {
  90         return -ENOSYS;
  91 }
  92
  93 static inline
  94 int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
  95         struct lttng_consumer_stream *stream)
  96 {
  97         return -ENOSYS;
  98 }
  99
 100 static inline
 101 int lttng_ustconsumer_get_produced_snapshot(
 102         struct lttng_consumer_local_data *ctx,
 103         struct lttng_consumer_stream *stream,
 104         unsigned long *pos)
 105 {
 106         return -ENOSYS;
 107 }
 108
 109 static inline
 110 int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 111                 int sock, struct pollfd *consumer_sockpoll)
 112 {
 113         return -ENOSYS;
 114 }
 115
 116 static inline
 117 int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan)
 118 {
 119         return -ENOSYS;
 120 }
 121
 122 static inline
 123 void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
 124 {
 125 }
 126
 127 static inline
 128 int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream)
 129 {
 130         return -ENOSYS;
 131 }
 132
 133 static inline
 134 void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
 135 {
 136 }
 137
 138 static inline
 139 int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
 140                 struct lttng_consumer_local_data *ctx)
 141 {
 142         return -ENOSYS;
 143 }
 144
 145 static inline
 146 int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
 147 {
 148         return -ENOSYS;
 149 }
 150
 151 static inline
 152 void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
 153 {
 154 }
 155
 156 #endif /* HAVE_LIBLTTNG_UST_CTL */
 157
 158 #endif /* _LTTNG_USTCONSUMER_H */