1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 #include <binder/unique_fd.h>
20
21 #if defined(_WIN32) || defined(__TRUSTY__)
22 // Pipe and Socketpair are missing there
23 #elif !defined(BINDER_NO_LIBBASE)
24
25 namespace android::binder {
26 using android::base::Pipe;
27 using android::base::Socketpair;
28 } // namespace android::binder
29
30 #else // BINDER_NO_LIBBASE
31
32 #include <sys/socket.h>
33
34 namespace android::binder {
35
36 // Inline functions, so that they can be used header-only.
37
38 // See pipe(2).
39 // This helper hides the details of converting to unique_fd, and also hides the
40 // fact that macOS doesn't support O_CLOEXEC or O_NONBLOCK directly.
41 inline bool Pipe(unique_fd* read, unique_fd* write, int flags = O_CLOEXEC) {
42 int pipefd[2];
43
44 #if defined(__APPLE__)
45 if (flags & ~(O_CLOEXEC | O_NONBLOCK)) {
46 return false;
47 }
48 if (pipe(pipefd) != 0) {
49 return false;
50 }
51
52 if (flags & O_CLOEXEC) {
53 if (fcntl(pipefd[0], F_SETFD, FD_CLOEXEC) != 0 ||
54 fcntl(pipefd[1], F_SETFD, FD_CLOEXEC) != 0) {
55 close(pipefd[0]);
56 close(pipefd[1]);
57 return false;
58 }
59 }
60 if (flags & O_NONBLOCK) {
61 if (fcntl(pipefd[0], F_SETFL, O_NONBLOCK) != 0 ||
62 fcntl(pipefd[1], F_SETFL, O_NONBLOCK) != 0) {
63 close(pipefd[0]);
64 close(pipefd[1]);
65 return false;
66 }
67 }
68 #else
69 if (pipe2(pipefd, flags) != 0) {
70 return false;
71 }
72 #endif
73
74 read->reset(pipefd[0]);
75 write->reset(pipefd[1]);
76 return true;
77 }
78
79 // See socketpair(2).
80 // This helper hides the details of converting to unique_fd.
Socketpair(int domain,int type,int protocol,unique_fd * left,unique_fd * right)81 inline bool Socketpair(int domain, int type, int protocol, unique_fd* left, unique_fd* right) {
82 int sockfd[2];
83 if (socketpair(domain, type, protocol, sockfd) != 0) {
84 return false;
85 }
86 left->reset(sockfd[0]);
87 right->reset(sockfd[1]);
88 return true;
89 }
90
91 // See socketpair(2).
92 // This helper hides the details of converting to unique_fd.
Socketpair(int type,unique_fd * left,unique_fd * right)93 inline bool Socketpair(int type, unique_fd* left, unique_fd* right) {
94 return Socketpair(AF_UNIX, type, 0, left, right);
95 }
96
97 } // namespace android::binder
98
99 #endif // BINDER_NO_LIBBASE
100