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65 lines
3.3 KiB
Plaintext
65 lines
3.3 KiB
Plaintext
// Copyright 2014 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <mach/mach_types.defs>
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#include <mach/std_types.defs>
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// child_port provides an interface for port rights to be transferred between
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// tasks. Its expected usage is for child processes to be able to pass port
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// rights to their parent processes. A child may wish to give its parent a copy
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// of a send right to its own task port, or a child may hold a receive right for
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// a server and wish to furnish its parent with a send right to that server.
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//
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// This Mach subsystem defines the lowest-level interface for these rights to
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// be transferred. Most users will not user this interface directly, but will
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// use ChildPortHandshake, which builds on this interface by providing client
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// and server implementations, along with a protocol for establishing
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// communication in a parent-child process relationship.
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subsystem child_port 10011;
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serverprefix handle_;
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type child_port_server_t = mach_port_t;
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type child_port_token_t = uint64_t;
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import "util/mach/child_port_types.h";
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// Sends a Mach port right across an IPC boundary.
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//
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// server[in]: The server to send the port right to.
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// token[in]: A random opaque token, generated by the server and communicated to
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// the client through some secure means such as a shared pipe. The client
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// includes the token in its request to prove its authenticity to the
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// server. This parameter is necessary for instances where the server must
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// publish its service broadly, such as via the bootstrap server. When this
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// is done, anyone with access to the bootstrap server will be able to gain
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// rights to communicate with |server|, and |token| serves as a shared
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// secret allowing the server to verify that it has received a request from
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// the intended client. |server| will reject requests with an invalid
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// |token|.
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// port[in]: A port right to transfer to the server. In expected usage, this may
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// be a send or send-once right, and the |server| will reject a receive
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// right. It is permissible to specify make-send for a receive right.
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//
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// Return value: As this is a “simpleroutine”, the server does not respond to
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// the client request, and the client does not block waiting for a response
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// after sending its request. The return value is MACH_MSG_SUCCESS if the
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// request was queued for the server, without any indication of whether the
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// server considered the request valid or took any action. On data
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// validation or mach_msg() failure, another code will be returned
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// indicating the nature of the error.
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simpleroutine child_port_check_in(server: child_port_server_t;
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token: child_port_token_t;
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port: mach_port_poly_t);
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