Fuchsia requires the ability to sandbox Isolates w.r.t. file IO.
When a new Isolate starts, Fuchsia will pass the Isolate an object
called a namespace. We can translate the namespace object into a
file descriptor suitable for passing to the *at() family of
POSIX file system calls. The file system calls will then
have visibility only into the specified namespace.
We also plumb Namespaces through on all the other platforms as well to
make the change easier to test and so that in the future we can
implement e.g. per-isolate cwds.
This change adds a new internal class to dart:io called _Namespace,
which is implemented in a patch file. See:
sdk/lib/io/namespace_impl.dart
runtime/bin/namespace_patch.dart
The embedder can set up a non-default namespace by calling
_Namespace._setupNamespace during Isolate setup.
Instances of _Namespace have a native field that holds a pointer
to a native Namespace object. See:
runtime/bin/namespace.h
Calls from e.g. file_impl.dart are now also passed a
_Namespace object. The implementations in e.g. file.cc and
file_linux.cc then extract the namespace, and use it to compute a
file descriptor and path suitable for passing to e.g. openat().
related US-313
R=asiva@google.com, rmacnak@google.com
Review-Url: https://codereview.chromium.org/3007703002 .
The finalizer sends the "close" message to the EventHandler for the
file descriptor in the _NativeSocket's native field. To avoid races and
spurious messages, this CL stores a pointer to a wrapper object in the
native field instead of the file descriptor. All messsages about the
_NativeSocket sent to the EventHandler use the wrapper object instead of
the file descriptor. When the EventHandler closes the file, the file
descriptor in the wrapper object is set to -1 so that the finalizer will
instead do nothing.
On Windows, there is another level of indirection since the OS HANDLEs
were already wrapped in various kinds of Handle objects. As an additional
complication, ClientSocket close on Windows is asynchronous, so the
EventHandler may shutdown before all of the ClientSocket Handles can be
destroyed.
related #27898, #28081R=johnmccutchan@google.com
Review-Url: https://codereview.chromium.org/2760293002 .
Like HOST_ARCH_*, HOST_OS_* describes the OS the VM is running on, which may be different from the OS the VM is generating code for during AOT compilation.
Currently we conflate the two when emitting AOT as assembly, and we get away with it because Flutter only uses assembly for targeting iOS and one can only target iOS from a Mac, but we expect to use assembly for Android as well so native tools can unwind Dart frames.
R=zra@google.com
Review-Url: https://codereview.chromium.org/2750843003 .
Now, failing to allocate a buffer for stderr or stdout will generate
an ENOMEM OSError exception.
Also previously, read() returning an error would cause buffers for
stderr and stdout to leak. After this change, they'll be reclaimed.
R=asiva@google.com
Review-Url: https://codereview.chromium.org/2596543002 .
i.e. #ifndef VM_WHATEVER -> #ifndef RUNTIME_VM_WHATEVER
This lets us remove a hack from the PRESUBMIT.py script that existed
for reasons that are no longer valid, and sets us up to add some
presubmit checks for the GN build.
R=asiva@google.com, rmacnak@google.com
Review URL: https://codereview.chromium.org/2450713004 .
- Use only one thread to wait for multiple process objects.
- Fix issue where reading from a closed pipe would print an
error message on stderr.
- Remove the need to go to dart before removing a processinfo
object from the list. Sometimes you never get there so we
have to remove the process info object always.
BUG=
TEST=
Review URL: https://chromiumcodereview.appspot.com//9310053
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3844 260f80e4-7a28-3924-810f-c04153c831b5
As glibc allocation routines are not re-entrant avoid calling delete in signal handler.
Instead the message send from the signal handler on process exit contains both the pid and the exit code. The internal _Process object always installs a data handler for the exit message and calls back into C++ to cleanup the resources allocated for running a process.
Changed the ActiveProcess (renamed to ProcessInfo) to form an explicitly linked list.
R=ager@google.com
BUG=dart:1
TEST=
Review URL: http://codereview.chromium.org//8227010
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@325 260f80e4-7a28-3924-810f-c04153c831b5
Zachary Anderson