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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/globals.h"
#if defined(HOST_OS_ANDROID)
#include "bin/file_system_watcher.h"
#include <errno.h> // NOLINT
#include <sys/inotify.h> // NOLINT
#include "bin/fdutils.h"
#include "bin/file.h"
#include "bin/socket.h"
#include "platform/signal_blocker.h"
namespace dart {
namespace bin {
bool FileSystemWatcher::IsSupported() {
return true;
}
intptr_t FileSystemWatcher::Init() {
int id = NO_RETRY_EXPECTED(inotify_init());
if (id < 0 || !FDUtils::SetCloseOnExec(id)) {
return -1;
}
// Some systems dosn't support setting this as non-blocking. Since watching
// internals are kept away from the user, we know it's possible to continue,
// even if setting non-blocking fails.
FDUtils::SetNonBlocking(id);
return id;
}
void FileSystemWatcher::Close(intptr_t id) {
USE(id);
}
intptr_t FileSystemWatcher::WatchPath(intptr_t id,
Namespace* namespc,
const char* path,
int events,
bool recursive) {
int list_events = IN_DELETE_SELF | IN_MOVE_SELF;
if ((events & kCreate) != 0) {
list_events |= IN_CREATE;
}
if ((events & kModifyContent) != 0) {
list_events |= IN_CLOSE_WRITE | IN_ATTRIB | IN_MODIFY;
}
if ((events & kDelete) != 0) {
list_events |= IN_DELETE;
}
if ((events & kMove) != 0) {
list_events |= IN_MOVE;
}
const char* resolved_path = File::GetCanonicalPath(namespc, path);
path = resolved_path != NULL ? resolved_path : path;
int path_id =
NO_RETRY_EXPECTED(inotify_add_watch(id, resolved_path, list_events));
if (path_id < 0) {
return -1;
}
return path_id;
}
void FileSystemWatcher::UnwatchPath(intptr_t id, intptr_t path_id) {
VOID_NO_RETRY_EXPECTED(inotify_rm_watch(id, path_id));
}
intptr_t FileSystemWatcher::GetSocketId(intptr_t id, intptr_t path_id) {
USE(path_id);
return id;
}
static int InotifyEventToMask(struct inotify_event* e) {
int mask = 0;
if ((e->mask & IN_CLOSE_WRITE) != 0 || (e->mask & IN_MODIFY) != 0) {
mask |= FileSystemWatcher::kModifyContent;
}
if ((e->mask & IN_ATTRIB) != 0) {
mask |= FileSystemWatcher::kModifyAttribute;
}
if ((e->mask & IN_CREATE) != 0) {
mask |= FileSystemWatcher::kCreate;
}
if ((e->mask & IN_MOVE) != 0) {
mask |= FileSystemWatcher::kMove;
}
if ((e->mask & IN_DELETE) != 0) {
mask |= FileSystemWatcher::kDelete;
}
if ((e->mask & (IN_DELETE_SELF | IN_MOVE_SELF)) != 0) {
mask |= FileSystemWatcher::kDeleteSelf;
}
if ((e->mask & IN_ISDIR) != 0) {
mask |= FileSystemWatcher::kIsDir;
}
return mask;
}
Dart_Handle FileSystemWatcher::ReadEvents(intptr_t id, intptr_t path_id) {
USE(path_id);
const intptr_t kEventSize = sizeof(struct inotify_event);
const intptr_t kBufferSize = kEventSize + NAME_MAX + 1;
uint8_t buffer[kBufferSize];
intptr_t bytes = TEMP_FAILURE_RETRY(read(id, buffer, kBufferSize));
if (bytes < 0) {
ASSERT(EAGAIN == EWOULDBLOCK);
if ((bytes == -1) && (errno == EWOULDBLOCK)) {
// see also SocketBase::Read
bytes = 0;
} else {
return DartUtils::NewDartOSError();
}
}
const intptr_t kMaxCount = bytes / kEventSize;
Dart_Handle events = Dart_NewList(kMaxCount);
intptr_t offset = 0;
intptr_t i = 0;
while (offset < bytes) {
struct inotify_event* e =
reinterpret_cast<struct inotify_event*>(buffer + offset);
if ((e->mask & IN_IGNORED) == 0) {
Dart_Handle event = Dart_NewList(5);
int mask = InotifyEventToMask(e);
Dart_ListSetAt(event, 0, Dart_NewInteger(mask));
Dart_ListSetAt(event, 1, Dart_NewInteger(e->cookie));
if (e->len > 0) {
Dart_Handle name = Dart_NewStringFromUTF8(
reinterpret_cast<uint8_t*>(e->name), strlen(e->name));
if (Dart_IsError(name)) {
return name;
}
Dart_ListSetAt(event, 2, name);
} else {
Dart_ListSetAt(event, 2, Dart_Null());
}
Dart_ListSetAt(event, 3, Dart_NewBoolean(e->mask & IN_MOVED_TO));
Dart_ListSetAt(event, 4, Dart_NewInteger(e->wd));
Dart_ListSetAt(events, i, event);
i++;
}
offset += kEventSize + e->len;
}
ASSERT(offset == bytes);
return events;
}
} // namespace bin
} // namespace dart
#endif // defined(HOST_OS_ANDROID)