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