src/common/kernel-ctl/kernel-ctl.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 modify
   6  * it under the terms of the GNU General Public License, version 2 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <sys/ioctl.h>
  20
  21 #include "kernel-ctl.h"
  22 #include "kernel-ioctl.h"
  23
  24 int kernctl_create_session(int fd)
  25 {
  26         return ioctl(fd, LTTNG_KERNEL_SESSION);
  27 }
  28
  29 /* open the metadata global channel */
  30 int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
  31 {
  32         return ioctl(fd, LTTNG_KERNEL_METADATA, chops);
  33 }
  34
  35 int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
  36 {
  37         return ioctl(fd, LTTNG_KERNEL_CHANNEL, chops);
  38 }
  39
  40 int kernctl_create_stream(int fd)
  41 {
  42         return ioctl(fd, LTTNG_KERNEL_STREAM);
  43 }
  44
  45 int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
  46 {
  47         return ioctl(fd, LTTNG_KERNEL_EVENT, ev);
  48 }
  49
  50 int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
  51 {
  52         return ioctl(fd, LTTNG_KERNEL_CONTEXT, ctx);
  53 }
  54
  55
  56 /* Enable event, channel and session ioctl */
  57 int kernctl_enable(int fd)
  58 {
  59         return ioctl(fd, LTTNG_KERNEL_ENABLE);
  60 }
  61
  62 /* Disable event, channel and session ioctl */
  63 int kernctl_disable(int fd)
  64 {
  65         return ioctl(fd, LTTNG_KERNEL_DISABLE);
  66 }
  67
  68 int kernctl_start_session(int fd)
  69 {
  70         return ioctl(fd, LTTNG_KERNEL_SESSION_START);
  71 }
  72
  73 int kernctl_stop_session(int fd)
  74 {
  75         return ioctl(fd, LTTNG_KERNEL_SESSION_STOP);
  76 }
  77
  78
  79 int kernctl_tracepoint_list(int fd)
  80 {
  81         return ioctl(fd, LTTNG_KERNEL_TRACEPOINT_LIST);
  82 }
  83
  84 int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
  85 {
  86         return ioctl(fd, LTTNG_KERNEL_TRACER_VERSION, v);
  87 }
  88
  89 int kernctl_wait_quiescent(int fd)
  90 {
  91         return ioctl(fd, LTTNG_KERNEL_WAIT_QUIESCENT);
  92 }
  93
  94 int kernctl_calibrate(int fd, struct lttng_kernel_calibrate *calibrate)
  95 {
  96         return ioctl(fd, LTTNG_KERNEL_CALIBRATE, calibrate);
  97 }
  98
  99
 100 int kernctl_buffer_flush(int fd)
 101 {
 102         return ioctl(fd, RING_BUFFER_FLUSH);
 103 }
 104
 105
 106 /* Buffer operations */
 107
 108 /* For mmap mode, readable without "get" operation */
 109
 110 /* returns the length to mmap. */
 111 int kernctl_get_mmap_len(int fd, unsigned long *len)
 112 {
 113         return ioctl(fd, RING_BUFFER_GET_MMAP_LEN, len);
 114 }
 115
 116 /* returns the maximum size for sub-buffers. */
 117 int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
 118 {
 119         return ioctl(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
 120 }
 121
 122 /*
 123  * For mmap mode, operate on the current packet (between get/put or
 124  * get_next/put_next).
 125  */
 126
 127 /* returns the offset of the subbuffer belonging to the mmap reader. */
 128 int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
 129 {
 130         return ioctl(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
 131 }
 132
 133 /* returns the size of the current sub-buffer, without padding (for mmap). */
 134 int kernctl_get_subbuf_size(int fd, unsigned long *len)
 135 {
 136         return ioctl(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
 137 }
 138
 139 /* returns the size of the current sub-buffer, without padding (for mmap). */
 140 int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
 141 {
 142         return ioctl(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
 143 }
 144
 145 /* Get exclusive read access to the next sub-buffer that can be read. */
 146 int kernctl_get_next_subbuf(int fd)
 147 {
 148         return ioctl(fd, RING_BUFFER_GET_NEXT_SUBBUF);
 149 }
 150
 151
 152 /* Release exclusive sub-buffer access, move consumer forward. */
 153 int kernctl_put_next_subbuf(int fd)
 154 {
 155         return ioctl(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
 156 }
 157
 158 /* snapshot */
 159
 160 /* Get a snapshot of the current ring buffer producer and consumer positions */
 161 int kernctl_snapshot(int fd)
 162 {
 163         return ioctl(fd, RING_BUFFER_SNAPSHOT);
 164 }
 165
 166 /* Get the consumer position (iteration start) */
 167 int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
 168 {
 169         return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
 170 }
 171
 172 /* Get the producer position (iteration end) */
 173 int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
 174 {
 175         return ioctl(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
 176 }
 177
 178 /* Get exclusive read access to the specified sub-buffer position */
 179 int kernctl_get_subbuf(int fd, unsigned long *len)
 180 {
 181         return ioctl(fd, RING_BUFFER_GET_SUBBUF, len);
 182 }
 183
 184 /* Release exclusive sub-buffer access */
 185 int kernctl_put_subbuf(int fd)
 186 {
 187         return ioctl(fd, RING_BUFFER_PUT_SUBBUF);
 188 }