src/lib/lttng-ust/lttng-context-ip.c

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * LTTng UST Instruction Pointer Context.
   7  */
   8
   9 #define _LGPL_SOURCE
  10 #include <limits.h>
  11 #include <stddef.h>
  12 #include <sys/types.h>
  13 #include <unistd.h>
  14 #include <lttng/ust-events.h>
  15 #include <lttng/ust-tracer.h>
  16 #include <lttng/ust-ringbuffer-context.h>
  17
  18 #include "context-internal.h"
  19
  20 static
  21 size_t ip_get_size(void *priv __attribute__((unused)),
  22                 size_t offset)
  23 {
  24         size_t size = 0;
  25
  26         size += lttng_ust_ring_buffer_align(offset, lttng_ust_rb_alignof(void *));
  27         size += sizeof(void *);
  28         return size;
  29 }
  30
  31 static
  32 void ip_record(void *priv __attribute__((unused)),
  33                  struct lttng_ust_ring_buffer_ctx *ctx,
  34                  struct lttng_ust_channel_buffer *chan)
  35 {
  36         void *ip;
  37
  38         ip = ctx->ip;
  39         chan->ops->event_write(ctx, &ip, sizeof(ip), lttng_ust_rb_alignof(ip));
  40 }
  41
  42 static const struct lttng_ust_ctx_field *ctx_field = lttng_ust_static_ctx_field(
  43         lttng_ust_static_event_field("ip",
  44                 lttng_ust_static_type_integer(sizeof(void *) * CHAR_BIT,
  45                                 lttng_ust_rb_alignof(void *) * CHAR_BIT,
  46                                 lttng_ust_is_signed_type(void *),
  47                                 LTTNG_UST_BYTE_ORDER, 10),
  48                 false, false),
  49         ip_get_size,
  50         ip_record,
  51         NULL, NULL, NULL);
  52
  53 int lttng_add_ip_to_ctx(struct lttng_ust_ctx **ctx)
  54 {
  55         int ret;
  56
  57         if (lttng_find_context(*ctx, ctx_field->event_field->name)) {
  58                 ret = -EEXIST;
  59                 goto error_find_context;
  60         }
  61         ret = lttng_ust_context_append(ctx, ctx_field);
  62         if (ret)
  63                 return ret;
  64         return 0;
  65
  66 error_find_context:
  67         return ret;
  68 }