liblttng-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 <stddef.h>
  11 #include <sys/types.h>
  12 #include <unistd.h>
  13 #include <lttng/ust-events.h>
  14 #include <lttng/ust-tracer.h>
  15 #include <lttng/ringbuffer-config.h>
  16
  17 #include "context-internal.h"
  18
  19 static
  20 size_t ip_get_size(struct lttng_ctx_field *field, size_t offset)
  21 {
  22         size_t size = 0;
  23
  24         size += lib_ring_buffer_align(offset, lttng_alignof(void *));
  25         size += sizeof(void *);
  26         return size;
  27 }
  28
  29 static
  30 void ip_record(struct lttng_ctx_field *field,
  31                  struct lttng_ust_lib_ring_buffer_ctx *ctx,
  32                  struct lttng_channel *chan)
  33 {
  34         void *ip;
  35
  36         ip = ctx->ip;
  37         lib_ring_buffer_align_ctx(ctx, lttng_alignof(ip));
  38         chan->ops->event_write(ctx, &ip, sizeof(ip));
  39 }
  40
  41 int lttng_add_ip_to_ctx(struct lttng_ctx **ctx)
  42 {
  43         struct lttng_ctx_field *field;
  44
  45         field = lttng_append_context(ctx);
  46         if (!field)
  47                 return -ENOMEM;
  48         if (lttng_find_context(*ctx, "ip")) {
  49                 lttng_remove_context_field(ctx, field);
  50                 return -EEXIST;
  51         }
  52         field->event_field.name = "ip";
  53         field->event_field.type.atype = atype_integer;
  54         field->event_field.type.u.integer.size = sizeof(void *) * CHAR_BIT;
  55         field->event_field.type.u.integer.alignment = lttng_alignof(void *) * CHAR_BIT;
  56         field->event_field.type.u.integer.signedness = lttng_is_signed_type(void *);
  57         field->event_field.type.u.integer.reverse_byte_order = 0;
  58         field->event_field.type.u.integer.base = 16;
  59         field->event_field.type.u.integer.encoding = lttng_encode_none;
  60         field->get_size = ip_get_size;
  61         field->record = ip_record;
  62         lttng_context_update(*ctx);
  63         return 0;
  64 }