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-rw-r--r--libappfuse/Android.bp1
-rw-r--r--libappfuse/EpollController.cc66
-rw-r--r--libappfuse/include/libappfuse/EpollController.h50
3 files changed, 117 insertions, 0 deletions
diff --git a/libappfuse/Android.bp b/libappfuse/Android.bp
index f729faf73..0d578144a 100644
--- a/libappfuse/Android.bp
+++ b/libappfuse/Android.bp
@@ -19,6 +19,7 @@ cc_library_shared {
19 "FuseAppLoop.cc", 19 "FuseAppLoop.cc",
20 "FuseBuffer.cc", 20 "FuseBuffer.cc",
21 "FuseBridgeLoop.cc", 21 "FuseBridgeLoop.cc",
22 "EpollController.cc",
22 ] 23 ]
23} 24}
24 25
diff --git a/libappfuse/EpollController.cc b/libappfuse/EpollController.cc
new file mode 100644
index 000000000..9daeab8f4
--- /dev/null
+++ b/libappfuse/EpollController.cc
@@ -0,0 +1,66 @@
1/*
2 * Copyright (C) 2017 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 specic language governing permissions and
14 * limitations under the License.
15 */
16
17#include <android-base/logging.h>
18
19#include "libappfuse/EpollController.h"
20
21namespace android {
22namespace fuse {
23
24EpollController::EpollController(base::unique_fd&& poll_fd) : poll_fd_(std::move(poll_fd)) {
25}
26
27bool EpollController::Wait(size_t event_count) {
28 events_.resize(event_count);
29 const int result = TEMP_FAILURE_RETRY(epoll_wait(poll_fd_, events_.data(), event_count, -1));
30 if (result == -1) {
31 PLOG(ERROR) << "Failed to wait for epoll";
32 return false;
33 }
34 events_.resize(result);
35 return true;
36}
37
38bool EpollController::AddFd(int fd, int events, void* data) {
39 return InvokeControl(EPOLL_CTL_ADD, fd, events, data);
40}
41
42bool EpollController::UpdateFd(int fd, int events, void* data) {
43 return InvokeControl(EPOLL_CTL_MOD, fd, events, data);
44}
45
46bool EpollController::RemoveFd(int fd) {
47 return InvokeControl(EPOLL_CTL_DEL, fd, /* events */ 0, nullptr);
48}
49
50const std::vector<epoll_event>& EpollController::events() const {
51 return events_;
52}
53
54bool EpollController::InvokeControl(int op, int fd, int events, void* data) const {
55 epoll_event event;
56 memset(&event, 0, sizeof(event));
57 event.events = events;
58 event.data.ptr = data;
59 if (epoll_ctl(poll_fd_, op, fd, &event) == -1) {
60 PLOG(ERROR) << "epoll_ctl() error op=" << op;
61 return false;
62 }
63 return true;
64}
65}
66}
diff --git a/libappfuse/include/libappfuse/EpollController.h b/libappfuse/include/libappfuse/EpollController.h
new file mode 100644
index 000000000..3863abae7
--- /dev/null
+++ b/libappfuse/include/libappfuse/EpollController.h
@@ -0,0 +1,50 @@
1/*
2 * Copyright (C) 2017 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 specic language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_LIBAPPFUSE_EPOLLCONTROLLER_H_
18#define ANDROID_LIBAPPFUSE_EPOLLCONTROLLER_H_
19
20#include <sys/epoll.h>
21
22#include <vector>
23
24#include <android-base/macros.h>
25#include <android-base/unique_fd.h>
26
27namespace android {
28namespace fuse {
29
30class EpollController {
31 public:
32 explicit EpollController(base::unique_fd&& poll_fd);
33 bool Wait(size_t event_count);
34 bool AddFd(int fd, int events, void* data);
35 bool UpdateFd(int fd, int events, void* data);
36 bool RemoveFd(int fd);
37
38 const std::vector<epoll_event>& events() const;
39
40 private:
41 bool InvokeControl(int op, int fd, int events, void* data) const;
42 base::unique_fd poll_fd_;
43 std::vector<epoll_event> events_;
44
45 DISALLOW_COPY_AND_ASSIGN(EpollController);
46};
47}
48}
49
50#endif // ANDROID_LIBAPPFUSE_EPOLLCONTROLLER_H_