1 /*
2 * Copyright (C) 2011 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 #define LOG_TAG "LibAAH_RTP"
18 #include <utils/Log.h>
19
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <poll.h>
23 #include <unistd.h>
24
25 #include "pipe_event.h"
26
27 namespace android {
28
PipeEvent()29 PipeEvent::PipeEvent() {
30 pipe_[0] = -1;
31 pipe_[1] = -1;
32
33 // Create the pipe.
34 if (pipe(pipe_) >= 0) {
35 // Set non-blocking mode on the read side of the pipe so we can
36 // easily drain it whenever we wakeup.
37 fcntl(pipe_[0], F_SETFL, O_NONBLOCK);
38 } else {
39 ALOGE("Failed to create pipe event %d %d %d",
40 pipe_[0], pipe_[1], errno);
41 pipe_[0] = -1;
42 pipe_[1] = -1;
43 }
44 }
45
~PipeEvent()46 PipeEvent::~PipeEvent() {
47 if (pipe_[0] >= 0) {
48 close(pipe_[0]);
49 }
50
51 if (pipe_[1] >= 0) {
52 close(pipe_[1]);
53 }
54 }
55
clearPendingEvents()56 void PipeEvent::clearPendingEvents() {
57 char drain_buffer[16];
58 while (read(pipe_[0], drain_buffer, sizeof(drain_buffer)) > 0) {
59 // No body.
60 }
61 }
62
wait(int timeout)63 bool PipeEvent::wait(int timeout) {
64 struct pollfd wait_fd;
65
66 wait_fd.fd = getWakeupHandle();
67 wait_fd.events = POLLIN;
68 wait_fd.revents = 0;
69
70 int res = poll(&wait_fd, 1, timeout);
71
72 if (res < 0) {
73 ALOGE("Wait error in PipeEvent; sleeping to prevent overload!");
74 usleep(1000);
75 }
76
77 return (res > 0);
78 }
79
setEvent()80 void PipeEvent::setEvent() {
81 char foo = 'q';
82 write(pipe_[1], &foo, 1);
83 }
84
85 } // namespace android
86
87