77 lines
3.0 KiB
C
77 lines
3.0 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_
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#define BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_
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#include <stdint.h>
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#include <sys/types.h>
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#include <vector>
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#include "base/base_export.h"
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class Pickle;
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class BASE_EXPORT UnixDomainSocket {
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public:
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// Maximum number of file descriptors that can be read by RecvMsg().
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static const size_t kMaxFileDescriptors;
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// Use sendmsg to write the given msg and include a vector of file
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// descriptors. Returns true if successful.
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static bool SendMsg(int fd,
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const void* msg,
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size_t length,
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const std::vector<int>& fds);
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// Use recvmsg to read a message and an array of file descriptors. Returns
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// -1 on failure. Note: will read, at most, |kMaxFileDescriptors| descriptors.
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static ssize_t RecvMsg(int fd,
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void* msg,
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size_t length,
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std::vector<int>* fds);
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// Perform a sendmsg/recvmsg pair.
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// 1. This process creates a UNIX SEQPACKET socketpair. Using
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// connection-oriented sockets (SEQPACKET or STREAM) is critical here,
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// because if one of the ends closes the other one must be notified.
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// 2. This process writes a request to |fd| with an SCM_RIGHTS control
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// message containing on end of the fresh socket pair.
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// 3. This process blocks reading from the other end of the fresh
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// socketpair.
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// 4. The target process receives the request, processes it and writes the
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// reply to the end of the socketpair contained in the request.
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// 5. This process wakes up and continues.
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//
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// fd: descriptor to send the request on
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// reply: buffer for the reply
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// reply_len: size of |reply|
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// result_fd: (may be NULL) the file descriptor returned in the reply
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// (if any)
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// request: the bytes to send in the request
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static ssize_t SendRecvMsg(int fd,
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uint8_t* reply,
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unsigned reply_len,
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int* result_fd,
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const Pickle& request);
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// Similar to SendRecvMsg(), but |recvmsg_flags| allows to control the flags
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// of the recvmsg(2) call.
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static ssize_t SendRecvMsgWithFlags(int fd,
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uint8_t* reply,
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unsigned reply_len,
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int recvmsg_flags,
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int* result_fd,
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const Pickle& request);
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private:
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// Similar to RecvMsg, but allows to specify |flags| for recvmsg(2).
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static ssize_t RecvMsgWithFlags(int fd,
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void* msg,
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size_t length,
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int flags,
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std::vector<int>* fds);
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};
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#endif // BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_
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