libkernelctl/libkernelctl.c

   1 /*
   2  * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
   3  *                      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; either version 2
   8  * of the License, or (at your option) any later version.
   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 #include <sys/ioctl.h>
  21
  22 #include "kernel-ioctl.h"
  23 #include "libkernelctl.h"
  24 #include "lttngerr.h"
  25
  26 int kernctl_create_channel(int fd, struct lttng_channel *chops)
  27 {
  28         return ioctl(fd, KERNEL_CREATE_CHANNEL, chops);
  29 }
  30
  31 int kernctl_create_event(int fd, struct lttng_event *ev)
  32 {
  33         return ioctl(fd, KERNEL_CREATE_EVENT, ev);
  34 }
  35
  36 int kernctl_create_session(int fd)
  37 {
  38         return ioctl(fd, KERNEL_CREATE_SESSION);
  39 }
  40
  41 int kernctl_create_stream(int fd)
  42 {
  43         return ioctl(fd, KERNEL_CREATE_STREAM);
  44 }
  45
  46 /* returns the maximum size for sub-buffers. */
  47 int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
  48 {
  49         return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
  50 }
  51
  52 /* returns the length to mmap. */
  53 int kernctl_get_mmap_len(int fd, unsigned long *len)
  54 {
  55         return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len);
  56 }
  57
  58 /* returns the offset of the subbuffer belonging to the mmap reader. */
  59 int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
  60 {
  61         return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
  62 }
  63
  64 /* Get exclusive read access to the next sub-buffer that can be read. */
  65 int kernctl_get_next_subbuf(int fd)
  66 {
  67         return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF);
  68 }
  69
  70 /* returns the size of the current sub-buffer, without padding (for mmap). */
  71 int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
  72 {
  73         return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
  74 }
  75
  76 /* Get exclusive read access to the specified sub-buffer position */
  77 int kernctl_get_subbuf(int fd, unsigned long *len)
  78 {
  79         return ioctl(fd, RING_BUFFER_GET_SUBBUF, len);
  80 }
  81
  82 /* returns the size of the current sub-buffer, without padding (for mmap). */
  83 int kernctl_get_subbuf_size(int fd, unsigned long *len)
  84 {
  85         return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
  86 }
  87
  88 /* open the metadata global channel */
  89 int kernctl_open_metadata(int fd, struct lttng_channel *chops)
  90 {
  91         return ioctl(fd, KERNEL_OPEN_METADATA, chops);
  92 }
  93
  94 /* Release exclusive sub-buffer access, move consumer forward. */
  95 int kernctl_put_next_subbuf(int fd)
  96 {
  97         return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
  98 }
  99
 100 /* Release exclusive sub-buffer access */
 101 int kernctl_put_subbuf(int fd)
 102 {
 103         return ioctl(fd, RING_BUFFER_PUT_SUBBUF);
 104 }
 105
 106 /* Get a snapshot of the current ring buffer producer and consumer positions */
 107 int kernctl_snapshot(int fd)
 108 {
 109         return ioctl(fd, RING_BUFFER_SNAPSHOT);
 110 }
 111
 112 /* Get the consumer position (iteration start) */
 113 int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
 114 {
 115         return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
 116 }
 117
 118 /* Get the producer position (iteration end) */
 119 int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
 120 {
 121         return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
 122 }
 123
 124 int kernctl_start_session(int fd)
 125 {
 126         return ioctl(fd, KERNEL_SESSION_START);
 127 }
 128
 129 int kernctl_stop_session(int fd)
 130 {
 131         return ioctl(fd, KERNEL_SESSION_STOP);
 132 }
 133