src/common/payload.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 "payload.h"
   9 #include <common/dynamic-array.h>
  10 #include <common/dynamic-buffer.h>
  11 #include <common/error.h>
  12
  13 static
  14 void release_fd_handle_ref(void *ptr)
  15 {
  16         struct fd_handle *fd_handle = ptr;
  17
  18         fd_handle_put(fd_handle);
  19 }
  20
  21 void lttng_payload_init(struct lttng_payload *payload)
  22 {
  23         LTTNG_ASSERT(payload);
  24         lttng_dynamic_buffer_init(&payload->buffer);
  25         lttng_dynamic_pointer_array_init(&payload->_fd_handles,
  26                         release_fd_handle_ref);
  27 }
  28
  29 int lttng_payload_copy(const struct lttng_payload *src_payload,
  30                        struct lttng_payload *dst_payload)
  31 {
  32         int ret;
  33         size_t i;
  34
  35         ret = lttng_dynamic_buffer_append_buffer(
  36                         &dst_payload->buffer, &src_payload->buffer);
  37         if (ret) {
  38                 goto end;
  39         }
  40
  41         for (i = 0; i < lttng_dynamic_pointer_array_get_count(
  42                                         &src_payload->_fd_handles);
  43                         i++) {
  44                 struct fd_handle *new_fd_handle;
  45                 const struct fd_handle *src_fd_handle =
  46                                 lttng_dynamic_pointer_array_get_pointer(
  47                                                 &src_payload->_fd_handles, i);
  48
  49                 new_fd_handle = fd_handle_copy(src_fd_handle);
  50                 if (!new_fd_handle) {
  51                         PERROR("Failed to copy fd_handle while copying a payload");
  52                         ret = -1;
  53                         goto end;
  54                 }
  55
  56                 ret = lttng_payload_push_fd_handle(dst_payload, new_fd_handle);
  57                 fd_handle_put(new_fd_handle);
  58                 if (ret) {
  59                         goto end;
  60                 }
  61         }
  62
  63 end:
  64         return ret;
  65 }
  66
  67 void lttng_payload_reset(struct lttng_payload *payload)
  68 {
  69         if (!payload) {
  70                 return;
  71         }
  72
  73         lttng_dynamic_buffer_reset(&payload->buffer);
  74         lttng_dynamic_pointer_array_reset(&payload->_fd_handles);
  75 }
  76
  77 void lttng_payload_clear(struct lttng_payload *payload)
  78 {
  79         (void) lttng_dynamic_buffer_set_size(&payload->buffer, 0);
  80         lttng_dynamic_pointer_array_clear(&payload->_fd_handles);
  81 }
  82
  83 int lttng_payload_push_fd_handle(struct lttng_payload *payload,
  84                 struct fd_handle *fd_handle)
  85 {
  86         int ret;
  87
  88         if (!payload) {
  89                 ret = -1;
  90                 goto end;
  91         }
  92
  93         ret = lttng_dynamic_pointer_array_add_pointer(
  94                         &payload->_fd_handles, fd_handle);
  95         if (ret) {
  96                 goto end;
  97         }
  98
  99         fd_handle_get(fd_handle);
 100 end:
 101         return ret;
 102 }