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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /dom/chrome-webidl/IOUtils.webidl
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+interface nsIFile;
+
+/**
+ * IOUtils is a simple, efficient interface for performing file I/O from a
+ * privileged chrome-only context. All asynchronous I/O tasks are run on
+ * a background thread.
+ *
+ * Pending I/O tasks will block shutdown at the |profileBeforeChange| phase.
+ * During this shutdown phase, no additional I/O tasks will be accepted --
+ * method calls to this interface will reject once shutdown has entered this
+ * phase.
+ *
+ * IOUtils methods may reject for any number of reasons. Reasonable attempts
+ * have been made to map each common operating system error to a |DOMException|.
+ * Most often, a caller only needs to check if a given file wasn't found by
+ * catching the rejected error and checking if |ex.name === 'NotFoundError'|.
+ * In other cases, it is likely sufficient to allow the error to be caught and
+ * reported elsewhere.
+ */
+[ChromeOnly, Exposed=(Window, Worker)]
+namespace IOUtils {
+ /**
+ * Reads up to |opts.maxBytes| of the file at |path| according to |opts|.
+ *
+ * NB: The maximum file size that can be read is UINT32_MAX.
+ *
+ * @param path An absolute file path.
+ *
+ * @return Resolves with an array of unsigned byte values read from disk,
+ * otherwise rejects with a DOMException.
+ */
+ [NewObject]
+ Promise<Uint8Array> read(DOMString path, optional ReadOptions opts = {});
+ /**
+ * Reads the UTF-8 text file located at |path| and returns the decoded
+ * contents as a |DOMString|. If a UTF-8 byte order marker (BOM) is
+ * present, it will be stripped from the returned string.
+ *
+ * NB: The maximum file size that can be read is UINT32_MAX.
+ *
+ * @param path An absolute file path.
+ *
+ * @return Resolves with the file contents encoded as a string, otherwise
+ * rejects with a DOMException.
+ */
+ [NewObject]
+ Promise<UTF8String> readUTF8(DOMString path, optional ReadUTF8Options opts = {});
+ /**
+ * Read the UTF-8 text file located at |path| and return the contents
+ * parsed as JSON into a JS value.
+ *
+ * NB: The maximum file size that can be read is UINT32_MAX.
+ *
+ * @param path An absolute path.
+ *
+ * @return Resolves with the contents of the file parsed as JSON.
+ */
+ [NewObject]
+ Promise<any> readJSON(DOMString path, optional ReadUTF8Options opts = {});
+ /**
+ * Attempts to safely write |data| to a file at |path|.
+ *
+ * This operation can be made atomic by specifying the |tmpPath| option. If
+ * specified, then this method ensures that the destination file is not
+ * modified until the data is entirely written to the temporary file, after
+ * which point the |tmpPath| is moved to the specified |path|.
+ *
+ * The target file can also be backed up to a |backupFile| before any writes
+ * are performed to prevent data loss in case of corruption.
+ *
+ * @param path An absolute file path.
+ * @param data Data to write to the file at path.
+ *
+ * @return Resolves with the number of bytes successfully written to the file,
+ * otherwise rejects with a DOMException.
+ */
+ [NewObject]
+ Promise<unsigned long long> write(DOMString path, Uint8Array data, optional WriteOptions options = {});
+ /**
+ * Attempts to encode |string| to UTF-8, then safely write the result to a
+ * file at |path|. Works exactly like |write|.
+ *
+ * @param path An absolute file path.
+ * @param string A string to write to the file at path.
+ * @param options Options for writing the file.
+ *
+ * @return Resolves with the number of bytes successfully written to the file,
+ * otherwise rejects with a DOMException.
+ */
+ [NewObject]
+ Promise<unsigned long long> writeUTF8(DOMString path, UTF8String string, optional WriteOptions options = {});
+ /**
+ * Attempts to serialize |value| into a JSON string and encode it as into a
+ * UTF-8 string, then safely write the result to a file at |path|. Works
+ * exactly like |write|.
+ *
+ * @param path An absolute file path
+ * @param value The value to be serialized.
+ * @param options Options for writing the file. The "append" mode is not supported.
+ *
+ * @return Resolves with the number of bytes successfully written to the file,
+ * otherwise rejects with a DOMException.
+ */
+ [NewObject]
+ Promise<unsigned long long> writeJSON(DOMString path, any value, optional WriteOptions options = {});
+ /**
+ * Moves the file from |sourcePath| to |destPath|, creating necessary parents.
+ * If |destPath| is a directory, then the source file will be moved into the
+ * destination directory.
+ *
+ * @param sourcePath An absolute file path identifying the file or directory
+ * to move.
+ * @param destPath An absolute file path identifying the destination
+ * directory and/or file name.
+ *
+ * @return Resolves if the file is moved successfully, otherwise rejects with
+ * a DOMException.
+ */
+ [NewObject]
+ Promise<undefined> move(DOMString sourcePath, DOMString destPath, optional MoveOptions options = {});
+ /**
+ * Removes a file or directory at |path| according to |options|.
+ *
+ * @param path An absolute file path identifying the file or directory to
+ * remove.
+ *
+ * @return Resolves if the file is removed successfully, otherwise rejects
+ * with a DOMException.
+ */
+ [NewObject]
+ Promise<undefined> remove(DOMString path, optional RemoveOptions options = {});
+ /**
+ * Creates a new directory at |path| according to |options|.
+ *
+ * @param path An absolute file path identifying the directory to create.
+ *
+ * @return Resolves if the directory is created successfully, otherwise
+ * rejects with a DOMException.
+ */
+ [NewObject]
+ Promise<undefined> makeDirectory(DOMString path, optional MakeDirectoryOptions options = {});
+ /**
+ * Obtains information about a file, such as size, modification dates, etc.
+ *
+ * @param path An absolute file path identifying the file or directory to
+ * inspect.
+ *
+ * @return Resolves with a |FileInfo| object for the file at path, otherwise
+ * rejects with a DOMException.
+ *
+ * @see FileInfo
+ */
+ [NewObject]
+ Promise<FileInfo> stat(DOMString path);
+ /**
+ * Copies a file or directory from |sourcePath| to |destPath| according to
+ * |options|.
+ *
+ * @param sourcePath An absolute file path identifying the source file to be
+ * copied.
+ * @param destPath An absolute file path identifying the location for the
+ * copy.
+ *
+ * @return Resolves if the file was copied successfully, otherwise rejects
+ * with a DOMException.
+ */
+ [NewObject]
+ Promise<undefined> copy(DOMString sourcePath, DOMString destPath, optional CopyOptions options = {});
+ /**
+ * Updates the access time for the file at |path|.
+ *
+ * @param path An absolute file path identifying the file whose
+ * modification time is to be set. This file must exist
+ * and will not be created.
+ * @param modification An optional access time for the file expressed in
+ * milliseconds since the Unix epoch
+ * (1970-01-01T00:00:00Z). The current system time is used
+ * if this parameter is not provided.
+ *
+ * @return Resolves with the updated access time time expressed in
+ * milliseconds since the Unix epoch, otherwise rejects with a
+ * DOMException.
+ */
+ [NewObject]
+ Promise<long long> setAccessTime(DOMString path, optional long long access);
+ /**
+ * Updates the modification time for the file at |path|.
+ *
+ * @param path An absolute file path identifying the file whose
+ * modification time is to be set. This file must exist
+ * and will not be created.
+ * @param modification An optional modification time for the file expressed in
+ * milliseconds since the Unix epoch
+ * (1970-01-01T00:00:00Z). The current system time is used
+ * if this parameter is not provided.
+ *
+ * @return Resolves with the updated modification time expressed in
+ * milliseconds since the Unix epoch, otherwise rejects with a
+ * DOMException.
+ */
+ [NewObject]
+ Promise<long long> setModificationTime(DOMString path, optional long long modification);
+ /**
+ * Retrieves a (possibly empty) list of immediate children of the directory at
+ * |path|.
+ *
+ * @param path An absolute file path.
+ *
+ * @return Resolves with a sequence of absolute file paths representing the
+ * children of the directory at |path|, otherwise rejects with a
+ * DOMException.
+ */
+ [NewObject]
+ Promise<sequence<DOMString>> getChildren(DOMString path, optional GetChildrenOptions options = {});
+ /**
+ * Set the permissions of the file at |path|.
+ *
+ * Windows does not make a distinction between user, group, and other
+ * permissions like UNICES do. If a permission flag is set for any of user,
+ * group, or other has a permission, then all users will have that
+ * permission. Additionally, Windows does not support setting the
+ * "executable" permission.
+ *
+ * @param path An absolute file path
+ * @param permissions The UNIX file mode representing the permissions.
+ * @param honorUmask If omitted or true, any UNIX file mode value is
+ * modified by the process umask. If false, the exact value
+ * of UNIX file mode will be applied. This value has no effect
+ * on Windows.
+ *
+ * @return Resolves if the permissions were set successfully, otherwise
+ * rejects with a DOMException.
+ */
+ [NewObject]
+ Promise<undefined> setPermissions(DOMString path, unsigned long permissions, optional boolean honorUmask = true);
+ /**
+ * Return whether or not the file exists at the given path.
+ *
+ * @param path An absolute file path.
+ *
+ * @return A promise that resolves to whether or not the given file exists.
+ */
+ [NewObject]
+ Promise<boolean> exists(DOMString path);
+
+ /**
+ * Create a file with a unique name and return its path.
+ *
+ * @param parent An absolute path to the directory where the file is to be
+ * created.
+ * @param prefix A prefix for the filename.
+ *
+ * @return A promise that resolves to a unique filename.
+ */
+ [NewObject]
+ Promise<DOMString> createUniqueFile(DOMString parent, DOMString prefix, optional unsigned long permissions = 0644);
+
+ /**
+ * Create a directory with a unique name and return its path.
+ *
+ * @param parent An absolute path to the directory where the file is to be
+ * created.
+ * @param prefix A prefix for the directory name.
+ *
+ * @return A promise that resolves to a unique directory name.
+ */
+ [NewObject]
+ Promise<DOMString> createUniqueDirectory(DOMString parent, DOMString prefix, optional unsigned long permissions = 0755);
+
+ /**
+ * Compute the hash of a file as a hex digest.
+ *
+ * @param path The absolute path of the file to hash.
+ * @param method The hashing method to use.
+ *
+ * @return A promise that resolves to the hex digest of the file's hash in lowercase.
+ */
+ [NewObject]
+ Promise<UTF8String> computeHexDigest(DOMString path, HashAlgorithm method);
+
+#if defined(XP_WIN)
+ /**
+ * Return the Windows-specific file attributes of the file at the given path.
+ *
+ * @param path An absolute file path.
+ *
+ * @return A promise that resolves to the Windows-specific file attributes.
+ */
+ [NewObject]
+ Promise<WindowsFileAttributes> getWindowsAttributes(DOMString path);
+
+ /**
+ * Set the Windows-specific file attributes of the file at the given path.
+ *
+ * @param path An absolute file path.
+ * @param attrs The attributes to set. Attributes will only be set if they are
+ * |true| or |false| (i.e., |undefined| attributes are not
+ * changed).
+ *
+ * @return A promise that resolves is the attributes were set successfully.
+ */
+ [NewObject]
+ Promise<undefined> setWindowsAttributes(DOMString path, optional WindowsFileAttributes attrs = {});
+#elif defined(XP_MACOSX)
+ /**
+ * Return whether or not the file has a specific extended attribute.
+ *
+ * @param path An absolute path.
+ * @param attr The attribute to check for.
+ *
+ * @return A promise that resolves to whether or not the file has an extended
+ * attribute, or rejects with an error.
+ */
+ [NewObject]
+ Promise<boolean> hasMacXAttr(DOMString path, UTF8String attr);
+ /**
+ * Return the value of an extended attribute for a file.
+ *
+ * @param path An absolute path.
+ * @param attr The attribute to get the value of.
+ *
+ * @return A promise that resolves to the value of the extended attribute, or
+ * rejects with an error.
+ */
+ [NewObject]
+ Promise<Uint8Array> getMacXAttr(DOMString path, UTF8String attr);
+ /**
+ * Set the extended attribute on a file.
+ *
+ * @param path An absolute path.
+ * @param attr The attribute to set.
+ * @param value The value of the attribute to set.
+ *
+ * @return A promise that resolves to whether or not the file has an extended
+ * attribute, or rejects with an error.
+ */
+ [NewObject]
+ Promise<undefined> setMacXAttr(DOMString path, UTF8String attr, Uint8Array value);
+ /**
+ * Delete the extended attribute on a file.
+ *
+ * @param path An absolute path.
+ * @param attr The attribute to delete.
+ *
+ * @return A promise that resolves if the attribute was deleted, or rejects
+ * with an error.
+ */
+ [NewObject]
+ Promise<undefined> delMacXAttr(DOMString path, UTF8String attr);
+#endif
+
+ /**
+ * Return a nsIFile whose parent directory exists. The parent directory of the
+ * file will be created off main thread if it does not already exist.
+ *
+ * @param components The path components. The first component must be an
+ * absolute path.
+ *
+ * @return A promise that resolves to an nsIFile for the requested file.
+ */
+ [NewObject]
+ Promise<nsIFile> getFile(DOMString... components);
+
+ /**
+ * Return an nsIFile corresponding to a directory. It will be created
+ * off-main-thread if it does not already exist.
+ *
+ * @param components The path components. The first component must be an
+ * absolute path.
+ *
+ * @return A promise that resolves to an nsIFile for the requested directory.
+ */
+ [NewObject]
+ Promise<nsIFile> getDirectory(DOMString... components);
+};
+
+[Exposed=Window]
+partial namespace IOUtils {
+ /**
+ * The async shutdown client for the profile-before-change shutdown phase.
+ */
+ [Throws]
+ readonly attribute any profileBeforeChange;
+
+ /**
+ * The async shutdown client for the profile-before-change-telemetry shutdown
+ * phase.
+ *
+ * ONLY telemetry should register blockers on this client.
+ */
+ [Throws]
+ readonly attribute any sendTelemetry;
+};
+
+[Exposed=Worker]
+partial namespace IOUtils {
+ /**
+ * Synchronously opens the file at |path|. This API is only available in workers.
+ *
+ * @param path An absolute file path.
+ *
+ * @return A |SyncReadFile| object for the file.
+ */
+ [Throws]
+ SyncReadFile openFileForSyncReading(DOMString path);
+
+#ifdef XP_UNIX
+ /**
+ * Launch a child process; uses `base::LaunchApp` from IPC. (This WebIDL
+ * binding is currently Unix-only; it could also be supported on Windows
+ * but it would use u16-based strings, so it would basically be a separate
+ * copy of the bindings.)
+ *
+ * This interface was added for use by `Subprocess.sys.jsm`; other would-be
+ * callers may want to just use Subprocess instead of calling this directly.
+ *
+ * @param argv The command to run and its arguments.
+ * @param options Various parameters about how the child process is launched
+ * and its initial environment.
+ *
+ * @return The process ID. Note that various errors (e.g., the
+ * executable to be launched doesn't exist) may not be
+ * encountered until after the process is created, so a
+ * successful return doesn't necessarily imply a successful
+ * launch.
+ */
+ [Throws]
+ unsigned long launchProcess(sequence<UnixString> argv, LaunchOptions options);
+#endif
+};
+
+/**
+ * An object representing an open file, allowing parts of the file contents to be
+ * read synchronously. Only available in workers.
+ */
+[ChromeOnly, Exposed=Worker]
+interface SyncReadFile {
+ /**
+ * The file size, in bytes.
+ */
+ readonly attribute long long size;
+
+ /**
+ * Synchronously read |dest.length| bytes at offset |offset| into |dest|.
+ * Throws if the file has been closed already or if the read would be out-of-bounds.
+ *
+ * @param dest A Uint8Array whose entire contents will be overwritten with
+ * bytes read from the file.
+ * @param offset The file offset at which the read range begins. (The length of the
+ * range is given by |dest.length|.)
+ */
+ [Throws]
+ undefined readBytesInto(Uint8Array dest, long long offset);
+
+ /**
+ * Close the file. Subsequent calls to readBytesInto will throw.
+ * If the file is not closed manually, it will be closed once this object is GC'ed.
+ */
+ undefined close();
+};
+
+/**
+ * Options to be passed to the |IOUtils.readUTF8| method.
+ */
+dictionary ReadUTF8Options {
+ /**
+ * If true, this option indicates that the file to be read is compressed with
+ * LZ4-encoding, and should be decompressed before the data is returned to
+ * the caller.
+ */
+ boolean decompress = false;
+};
+
+/**
+ * Options to be passed to the |IOUtils.read| method.
+ */
+dictionary ReadOptions : ReadUTF8Options {
+ /**
+ * The offset into the file to read from. If unspecified, the file will be read
+ * from the start.
+ */
+ unsigned long long offset = 0;
+
+ /**
+ * The max bytes to read from the file at path. If unspecified, the entire
+ * file will be read. This option is incompatible with |decompress|.
+ */
+ unsigned long? maxBytes = null;
+};
+
+/**
+ * Modes for writing to a file.
+ */
+enum WriteMode {
+ /**
+ * Overwrite the contents of the file.
+ *
+ * The file will be created if it does not exist.
+ */
+ "overwrite",
+ /**
+ * Append to the end of the file.
+ *
+ * This mode will refuse to create the file if it does not exist.
+ */
+ "append",
+ /**
+ * Append to the end of the file, or create it if it does not exist.
+ */
+ "appendOrCreate",
+ /**
+ * Create a new file.
+ *
+ * This mode will refuse to overwrite an existing file.
+ */
+ "create",
+};
+
+/**
+ * Options to be passed to the |IOUtils.write| and |writeUTF8|
+ * methods.
+ */
+dictionary WriteOptions {
+ /**
+ * If specified, backup the destination file to this path before writing.
+ */
+ DOMString backupFile;
+ /**
+ * If specified, write the data to a file at |tmpPath| instead of directly to
+ * the destination. Once the write is complete, the destination will be
+ * overwritten by a move. Specifying this option will make the write a little
+ * slower, but also safer.
+ */
+ DOMString tmpPath;
+ /**
+ * The mode used to write to the file.
+ */
+ WriteMode mode = "overwrite";
+ /**
+ * If true, force the OS to write its internal buffers to the disk.
+ * This is considerably slower for the whole system, but safer in case of
+ * an improper system shutdown (e.g. due to a kernel panic) or device
+ * disconnection before the buffers are flushed.
+ */
+ boolean flush = false;
+ /**
+ * If true, compress the data with LZ4-encoding before writing to the file.
+ */
+ boolean compress = false;
+};
+
+/**
+ * Options to be passed to the |IOUtils.move| method.
+ */
+dictionary MoveOptions {
+ /**
+ * If true, fail if the destination already exists.
+ */
+ boolean noOverwrite = false;
+};
+
+/**
+ * Options to be passed to the |IOUtils.remove| method.
+ */
+dictionary RemoveOptions {
+ /**
+ * If true, no error will be reported if the target file is missing.
+ */
+ boolean ignoreAbsent = true;
+ /**
+ * If true, and the target is a directory, recursively remove files.
+ */
+ boolean recursive = false;
+
+ /**
+ * If true, a failed delete on a readonly file will be retried by first
+ * removing the readonly attribute.
+ *
+ * Only has an effect on Windows.
+ */
+ boolean retryReadonly = false;
+};
+
+/**
+ * Options to be passed to the |IOUtils.makeDirectory| method.
+ */
+dictionary MakeDirectoryOptions {
+ /**
+ * If true, create the directory and all necessary ancestors if they do not
+ * already exist. If false and any ancestor directories do not exist,
+ * |makeDirectory| will reject with an error.
+ */
+ boolean createAncestors = true;
+ /**
+ * If true, succeed even if the directory already exists (default behavior).
+ * Otherwise, fail if the directory already exists.
+ */
+ boolean ignoreExisting = true;
+ /**
+ * The file mode to create the directory with.
+ *
+ * This is ignored on Windows.
+ */
+ unsigned long permissions = 0755;
+
+};
+
+/**
+ * Options to be passed to the |IOUtils.copy| method.
+ */
+dictionary CopyOptions {
+ /**
+ * If true, fail if the destination already exists.
+ */
+ boolean noOverwrite = false;
+ /**
+ * If true, copy the source recursively.
+ */
+ boolean recursive = false;
+};
+
+/**
+ * Options to be passed to the |IOUtils.getChildren| method.
+ */
+dictionary GetChildrenOptions {
+ /**
+ * If true, no error will be reported if the target file is missing.
+ */
+ boolean ignoreAbsent = false;
+};
+
+/**
+ * Types of files that are recognized by the |IOUtils.stat| method.
+ */
+enum FileType { "regular", "directory", "other" };
+
+/**
+ * Basic metadata about a file.
+ */
+dictionary FileInfo {
+ /**
+ * The absolute path to the file on disk, as known when this file info was
+ * obtained.
+ */
+ DOMString path;
+
+ /**
+ * Identifies if the file at |path| is a regular file, directory, or something
+ * something else.
+ */
+ FileType type;
+
+ /**
+ * If this represents a regular file, the size of the file in bytes.
+ * Otherwise, -1.
+ */
+ long long size;
+
+ /**
+ * The timestamp of file creation, represented in milliseconds since Epoch
+ * (1970-01-01T00:00:00.000Z).
+ *
+ * This is only available on MacOS and Windows.
+ */
+ long long creationTime;
+
+ /**
+ * The timestmp of last file accesss, represented in milliseconds since Epoch
+ * (1970-01-01T00:00:00.000Z).
+ */
+ long long lastAccessed;
+
+ /**
+ * The timestamp of the last file modification, represented in milliseconds
+ * since Epoch (1970-01-01T00:00:00.000Z).
+ */
+ long long lastModified;
+
+ /**
+ * The permissions of the file, expressed as a UNIX file mode.
+ *
+ * NB: Windows does not make a distinction between user, group, and other
+ * permissions like UNICES do. The user, group, and other parts will always
+ * be identical on Windows.
+ */
+ unsigned long permissions;
+};
+
+/**
+ * The supported hash algorithms for |IOUtils.hashFile|.
+ */
+enum HashAlgorithm { "sha256", "sha384", "sha512" };
+
+#ifdef XP_WIN
+/**
+ * Windows-specific file attributes.
+ */
+dictionary WindowsFileAttributes {
+ /**
+ * Whether or not the file is read-only.
+ */
+ boolean readOnly;
+ /**
+ * Whether or not the file is hidden.
+ */
+ boolean hidden;
+ /**
+ * Whether or not the file is classified as a system file.
+ */
+ boolean system;
+};
+#endif
+
+#ifdef XP_UNIX
+/**
+ * Used where the POSIX API allows an arbitrary byte string but in
+ * practice it's usually UTF-8, so JS strings are accepted for
+ * convenience.
+ */
+typedef (UTF8String or Uint8Array) UnixString;
+
+/**
+ * Options for the `launchApp` method. See also `base::LaunchOptions`
+ * in C++.
+ */
+dictionary LaunchOptions {
+ /**
+ * The environment variables, as a sequence of `NAME=value` strings.
+ * (The underlying C++ code can also inherit the current environment
+ * with optional changes; that feature could be added here if needed.)
+ */
+ required sequence<UnixString> environment;
+
+ /**
+ * The initial current working directory.
+ */
+ UnixString workdir;
+
+ /**
+ * File descriptors to pass to the child process. Any fds not
+ * mentioned here, other than stdin/out/err, will not be inherited
+ * even if they aren't marked close-on-exec.
+ */
+ sequence<FdMapping> fdMap;
+
+ /**
+ * On macOS 10.14+, disclaims responsibility for the child process
+ * with respect to privacy/security permission prompts and
+ * decisions. Ignored if not supported by the OS.
+ */
+ boolean disclaim = false;
+};
+
+/**
+ * Describes a file descriptor to give to the child process.
+ */
+dictionary FdMapping {
+ /**
+ * The fd in the parent process to pass. This must remain open during
+ * the call to `launchApp` but can be closed after it returns (or throws).
+ */
+ required unsigned long src;
+
+ /**
+ * The fd number to map it to in the child process.
+ */
+ required unsigned long dst;
+};
+#endif