src/common/sessiond-comm/payload-view.c

   1 /*
   2  * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #include <common/buffer-view.h>
   9 #include "payload-view.h"
  10 #include "payload.h"
  11 #include <stddef.h>
  12
  13 LTTNG_HIDDEN
  14 struct lttng_payload_view lttng_payload_view_from_payload(
  15                 const struct lttng_payload *payload, size_t offset,
  16                 ptrdiff_t len)
  17 {
  18         return (struct lttng_payload_view) {
  19                 .buffer = lttng_buffer_view_from_dynamic_buffer(
  20                         &payload->buffer, offset, len),
  21                 ._fds = payload->_fds,
  22         };
  23 }
  24
  25 LTTNG_HIDDEN
  26 struct lttng_payload_view lttng_payload_view_from_view(
  27                 struct lttng_payload_view *view, size_t offset,
  28                 ptrdiff_t len)
  29 {
  30         return (struct lttng_payload_view) {
  31                 .buffer = lttng_buffer_view_from_view(
  32                         &view->buffer, offset, len),
  33                 ._fds = view->_fds,
  34                 ._iterator.p_fds_position = &view->_iterator.fds_position,
  35         };
  36 }
  37
  38 LTTNG_HIDDEN
  39 struct lttng_payload_view lttng_payload_view_from_dynamic_buffer(
  40                 const struct lttng_dynamic_buffer *buffer, size_t offset,
  41                 ptrdiff_t len)
  42 {
  43         return (struct lttng_payload_view) {
  44                 .buffer = lttng_buffer_view_from_dynamic_buffer(
  45                         buffer, offset, len)
  46         };
  47 }
  48
  49 LTTNG_HIDDEN
  50 int lttng_payload_view_pop_fd(struct lttng_payload_view *view)
  51 {
  52         int ret = 0;
  53         size_t fd_count;
  54         size_t *pos;
  55
  56         if (!view) {
  57                 ret = -1;
  58                 goto end;
  59         }
  60
  61         fd_count = lttng_dynamic_array_get_count(&view->_fds);
  62         pos = view->_iterator.p_fds_position ? view->_iterator.p_fds_position :
  63                 &view->_iterator.fds_position;
  64
  65         if (*pos >= fd_count) {
  66                 ret = -1;
  67                 goto end;
  68         }
  69
  70         ret = *((int *) lttng_dynamic_array_get_element(
  71                         &view->_fds, *pos));
  72         (*pos)++;
  73 end:
  74         return ret;
  75 }