Add new exception types: communication, protocol, and invalid argument
[lttng-tools.git] / src / common / fd-handle.cpp
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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 <unistd.h>
9#include <urcu/ref.h>
10
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11#include "fd-handle.hpp"
12#include <common/error.hpp>
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13
14struct fd_handle {
15 struct urcu_ref ref;
16 int fd;
17};
18
19static void fd_handle_release(struct urcu_ref *ref)
20{
21 int ret;
22 struct fd_handle *handle = container_of(ref, struct fd_handle, ref);
23
a0377dfe 24 LTTNG_ASSERT(handle->fd >= 0);
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25 ret = close(handle->fd);
26 if (ret == -1) {
27 PERROR("Failed to close file descriptor of fd_handle upon release: fd = %d",
28 handle->fd);
29 }
30
31 free(handle);
32}
33
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34struct fd_handle *fd_handle_create(int fd)
35{
36 struct fd_handle *handle = NULL;
37
38 if (fd < 0) {
39 ERR("Attempted to create an fd_handle from an invalid file descriptor: fd = %d",
40 fd);
41 goto end;
42 }
43
64803277 44 handle = zmalloc<fd_handle>();
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45 if (!handle) {
46 PERROR("Failed to allocate fd_handle");
47 goto end;
48 }
49
50 urcu_ref_init(&handle->ref);
51 handle->fd = fd;
52
53end:
54 return handle;
55}
56
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57void fd_handle_get(struct fd_handle *handle)
58{
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59 if (!handle) {
60 return;
61 }
62
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63 urcu_ref_get(&handle->ref);
64}
65
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66void fd_handle_put(struct fd_handle *handle)
67{
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68 if (!handle) {
69 return;
70 }
71
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72 urcu_ref_put(&handle->ref, fd_handle_release);
73}
74
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75int fd_handle_get_fd(struct fd_handle *handle)
76{
a0377dfe 77 LTTNG_ASSERT(handle);
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78 return handle->fd;
79}
80
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81struct fd_handle *fd_handle_copy(const struct fd_handle *handle)
82{
83 struct fd_handle *new_handle = NULL;
84 const int new_fd = dup(handle->fd);
85
86 if (new_fd < 0) {
87 PERROR("Failed to duplicate file descriptor while copying fd_handle: fd = %d", handle->fd);
88 goto end;
89 }
90
91 new_handle = fd_handle_create(new_fd);
92end:
93 return new_handle;
94}
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