1// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2// for details. All rights reserved. Use of this source code is governed by a
3// BSD-style license that can be found in the LICENSE file.
4
5#include "platform/globals.h"
6#if defined(HOST_OS_LINUX)
7
8#include "bin/file_system_watcher.h"
9
10#include <errno.h> // NOLINT
11#include <sys/inotify.h> // NOLINT
12
13#include "bin/fdutils.h"
14#include "bin/file.h"
15#include "bin/socket.h"
16#include "platform/signal_blocker.h"
17
18namespace dart {
19namespace bin {
20
21bool FileSystemWatcher::IsSupported() {
22 return true;
23}
24
25intptr_t FileSystemWatcher::Init() {
26 int id = NO_RETRY_EXPECTED(inotify_init1(IN_CLOEXEC));
27 if (id < 0) {
28 return -1;
29 }
30 // Some systems dosn't support setting this as non-blocking. Since watching
31 // internals are kept away from the user, we know it's possible to continue,
32 // even if setting non-blocking fails.
33 FDUtils::SetNonBlocking(id);
34 return id;
35}
36
37void FileSystemWatcher::Close(intptr_t id) {
38 USE(id);
39}
40
41intptr_t FileSystemWatcher::WatchPath(intptr_t id,
42 Namespace* namespc,
43 const char* path,
44 int events,
45 bool recursive) {
46 int list_events = IN_DELETE_SELF | IN_MOVE_SELF;
47 if ((events & kCreate) != 0) {
48 list_events |= IN_CREATE;
49 }
50 if ((events & kModifyContent) != 0) {
51 list_events |= IN_CLOSE_WRITE | IN_ATTRIB;
52 }
53 if ((events & kDelete) != 0) {
54 list_events |= IN_DELETE;
55 }
56 if ((events & kMove) != 0) {
57 list_events |= IN_MOVE;
58 }
59 const char* resolved_path = File::GetCanonicalPath(namespc, path);
60 path = resolved_path != NULL ? resolved_path : path;
61 int path_id = NO_RETRY_EXPECTED(inotify_add_watch(id, path, list_events));
62 if (path_id < 0) {
63 return -1;
64 }
65 return path_id;
66}
67
68void FileSystemWatcher::UnwatchPath(intptr_t id, intptr_t path_id) {
69 VOID_NO_RETRY_EXPECTED(inotify_rm_watch(id, path_id));
70}
71
72intptr_t FileSystemWatcher::GetSocketId(intptr_t id, intptr_t path_id) {
73 USE(path_id);
74 return id;
75}
76
77static int InotifyEventToMask(struct inotify_event* e) {
78 int mask = 0;
79 if ((e->mask & IN_CLOSE_WRITE) != 0) {
80 mask |= FileSystemWatcher::kModifyContent;
81 }
82 if ((e->mask & IN_ATTRIB) != 0) {
83 mask |= FileSystemWatcher::kModefyAttribute;
84 }
85 if ((e->mask & IN_CREATE) != 0) {
86 mask |= FileSystemWatcher::kCreate;
87 }
88 if ((e->mask & IN_MOVE) != 0) {
89 mask |= FileSystemWatcher::kMove;
90 }
91 if ((e->mask & IN_DELETE) != 0) {
92 mask |= FileSystemWatcher::kDelete;
93 }
94 if ((e->mask & (IN_DELETE_SELF | IN_MOVE_SELF)) != 0) {
95 mask |= FileSystemWatcher::kDeleteSelf;
96 }
97 if ((e->mask & IN_ISDIR) != 0) {
98 mask |= FileSystemWatcher::kIsDir;
99 }
100 return mask;
101}
102
103Dart_Handle FileSystemWatcher::ReadEvents(intptr_t id, intptr_t path_id) {
104 USE(path_id);
105 const intptr_t kEventSize = sizeof(struct inotify_event);
106 const intptr_t kBufferSize = kEventSize + NAME_MAX + 1;
107 uint8_t buffer[kBufferSize];
108 intptr_t bytes =
109 SocketBase::Read(id, buffer, kBufferSize, SocketBase::kAsync);
110 if (bytes < 0) {
111 return DartUtils::NewDartOSError();
112 }
113 const intptr_t kMaxCount = bytes / kEventSize;
114 Dart_Handle events = Dart_NewList(kMaxCount);
115 intptr_t offset = 0;
116 intptr_t i = 0;
117 while (offset < bytes) {
118 struct inotify_event* e =
119 reinterpret_cast<struct inotify_event*>(buffer + offset);
120 if ((e->mask & IN_IGNORED) == 0) {
121 Dart_Handle event = Dart_NewList(5);
122 int mask = InotifyEventToMask(e);
123 Dart_ListSetAt(event, 0, Dart_NewInteger(mask));
124 Dart_ListSetAt(event, 1, Dart_NewInteger(e->cookie));
125 if (e->len > 0) {
126 Dart_Handle name = Dart_NewStringFromUTF8(
127 reinterpret_cast<uint8_t*>(e->name), strlen(e->name));
128 if (Dart_IsError(name)) {
129 return name;
130 }
131 Dart_ListSetAt(event, 2, name);
132 } else {
133 Dart_ListSetAt(event, 2, Dart_Null());
134 }
135 Dart_ListSetAt(event, 3, Dart_NewBoolean((e->mask & IN_MOVED_TO) != 0u));
136 Dart_ListSetAt(event, 4, Dart_NewInteger(e->wd));
137 Dart_ListSetAt(events, i, event);
138 i++;
139 }
140 offset += kEventSize + e->len;
141 }
142 ASSERT(offset == bytes);
143 return events;
144}
145
146} // namespace bin
147} // namespace dart
148
149#endif // defined(HOST_OS_LINUX)
150