Add new exception types: communication, protocol, and invalid argument
[lttng-tools.git] / src / common / fd-handle.cpp
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
11 #include "fd-handle.hpp"
12 #include <common/error.hpp>
13
14 struct fd_handle {
15 struct urcu_ref ref;
16 int fd;
17 };
18
19 static 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
24 LTTNG_ASSERT(handle->fd >= 0);
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
34 struct 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
44 handle = zmalloc<fd_handle>();
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
53 end:
54 return handle;
55 }
56
57 void fd_handle_get(struct fd_handle *handle)
58 {
59 if (!handle) {
60 return;
61 }
62
63 urcu_ref_get(&handle->ref);
64 }
65
66 void fd_handle_put(struct fd_handle *handle)
67 {
68 if (!handle) {
69 return;
70 }
71
72 urcu_ref_put(&handle->ref, fd_handle_release);
73 }
74
75 int fd_handle_get_fd(struct fd_handle *handle)
76 {
77 LTTNG_ASSERT(handle);
78 return handle->fd;
79 }
80
81 struct 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);
92 end:
93 return new_handle;
94 }
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