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 #else /* HAVE_LIBLTTNG_UST_CTL */
  70
  71 static inline
  72 int lttng_ustconsumer_on_read_subbuffer_mmap(
  73                 struct lttng_consumer_local_data *ctx,
  74                 struct lttng_consumer_stream *stream, unsigned long len)
  75 {
  76         return -ENOSYS;
  77 }
  78
  79 static inline
  80 int lttng_ustconsumer_on_read_subbuffer_splice(
  81                 struct lttng_consumer_local_data *ctx,
  82                 struct lttng_consumer_stream *uststream, unsigned long len)
  83 {
  84         return -ENOSYS;
  85 }
  86
  87 static inline
  88 int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
  89         struct lttng_consumer_stream *stream)
  90 {
  91         return -ENOSYS;
  92 }
  93
  94 static inline
  95 int lttng_ustconsumer_get_produced_snapshot(
  96         struct lttng_consumer_local_data *ctx,
  97         struct lttng_consumer_stream *stream,
  98         unsigned long *pos)
  99 {
 100         return -ENOSYS;
 101 }
 102
 103 static inline
 104 int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 105                 int sock, struct pollfd *consumer_sockpoll)
 106 {
 107         return -ENOSYS;
 108 }
 109
 110 static inline
 111 int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan)
 112 {
 113         return -ENOSYS;
 114 }
 115
 116 static inline
 117 void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
 118 {
 119 }
 120
 121 static inline
 122 int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream)
 123 {
 124         return -ENOSYS;
 125 }
 126
 127 static inline
 128 void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
 129 {
 130 }
 131
 132 #endif /* HAVE_LIBLTTNG_UST_CTL */
 133
 134 #endif /* _LTTNG_USTCONSUMER_H */