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Unified Diff: runtime/bin/namespace_android.cc

Issue 3001963002: [dart:io] Namespaces for file IO (Closed)
Patch Set: Fuchsia fix Created 3 years, 4 months ago
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Index: runtime/bin/namespace_android.cc
diff --git a/runtime/bin/namespace_android.cc b/runtime/bin/namespace_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0ac3783033d272d225f97d8e23f651ed7d8b8ceb
--- /dev/null
+++ b/runtime/bin/namespace_android.cc
@@ -0,0 +1,101 @@
+// Copyright (c) 2017, 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/namespace.h"
+
+#include <errno.h>
+#include <fcntl.h>
+
+#include "bin/file.h"
+#include "bin/fdutils.h"
+#include "platform/signal_blocker.h"
+
+namespace dart {
+namespace bin {
+
+Namespace* Namespace::Create(const char* path) {
+ const int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY));
+ if (fd < 0) {
+ return NULL;
+ }
+ return new Namespace(fd);
+}
+
+Namespace::~Namespace() {
+ if (namespc_ != kNone) {
+ VOID_TEMP_FAILURE_RETRY(close(namespc_));
+ }
+}
+
+intptr_t Namespace::Default() {
+ return kNone;
+}
+
+const char* Namespace::GetCurrent(Namespace* namespc) {
+ if ((namespc == NULL) || (namespc->namespc() == kNone)) {
+ // TODO(zra): When there are isolate-specific namespaces, extract it from
+ // the namespace instead of calling getcwd.
+ char buffer[PATH_MAX];
+ if (getcwd(buffer, PATH_MAX) == NULL) {
+ return NULL;
+ }
+ return DartUtils::ScopedCopyCString(buffer);
+ }
+
+ // TODO(zra): Allow changing the current working directory when there is
+ // a non-default namespace.
+ return DartUtils::ScopedCopyCString("/");
+}
+
+bool Namespace::SetCurrent(Namespace* namespc, const char* path) {
+ if ((namespc == NULL) || (namespc->namespc() == kNone)) {
+ return (NO_RETRY_EXPECTED(chdir(path)) == 0);
+ }
+
+ // TODO(zra): If a non-default namespace is set up, changing the current
+ // working directoy is disallowed. We should relax this restriction when
+ // isolate-specific cwds are implemented.
+ errno = ENOSYS;
+ return false;
+}
+
+bool Namespace::ResolvePath(Namespace* namespc, const char* path,
+ intptr_t* dirfd, const char** resolved_path) {
+ ASSERT(dirfd != NULL);
+ ASSERT(resolved_path != NULL);
+ if ((namespc == NULL) || (namespc->namespc() == kNone)) {
+ *dirfd = AT_FDCWD;
+ *resolved_path = path;
+ return false;
+ }
+ *dirfd = namespc->namespc();
+ if (File::IsAbsolutePath(path)) {
+ if (strcmp(path, File::PathSeparator()) == 0) {
+ *resolved_path = ".";
+ } else {
+ *resolved_path = &path[1];
+ }
+ } else {
+ *resolved_path = path;
+ }
+ return false;
+}
+
+NamespaceScope::NamespaceScope(Namespace* namespc, const char* path) {
+ owns_fd_ = Namespace::ResolvePath(namespc, path, &fd_, &path_);
+}
+
+NamespaceScope::~NamespaceScope() {
+ if (owns_fd_) {
+ FDUtils::SaveErrorAndClose(fd_);
+ }
+}
+
+} // namespace bin
+} // namespace dart
+
+#endif // defined(HOST_OS_ANDROID)
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