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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ | 5 #ifndef BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ |
| 6 #define BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ | 6 #define BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ |
| 7 | 7 |
| 8 #include <stdint.h> | 8 #include <stdint.h> |
| 9 #include <sys/types.h> | 9 #include <sys/types.h> |
| 10 #include <vector> | 10 #include <vector> |
| 11 | 11 |
| 12 #include "base/base_export.h" | 12 #include "base/base_export.h" |
| 13 #include "base/files/scoped_file.h" |
| 14 #include "base/memory/scoped_vector.h" |
| 13 #include "base/process/process_handle.h" | 15 #include "base/process/process_handle.h" |
| 14 | 16 |
| 15 class Pickle; | 17 class Pickle; |
| 16 | 18 |
| 17 class BASE_EXPORT UnixDomainSocket { | 19 class BASE_EXPORT UnixDomainSocket { |
| 18 public: | 20 public: |
| 19 // Maximum number of file descriptors that can be read by RecvMsg(). | 21 // Maximum number of file descriptors that can be read by RecvMsg(). |
| 20 static const size_t kMaxFileDescriptors; | 22 static const size_t kMaxFileDescriptors; |
| 21 | 23 |
| 22 // Use to enable receiving process IDs in RecvMsgWithPid. Should be called on | 24 // Use to enable receiving process IDs in RecvMsgWithPid. Should be called on |
| 23 // the receiving socket (i.e., the socket passed to RecvMsgWithPid). Returns | 25 // the receiving socket (i.e., the socket passed to RecvMsgWithPid). Returns |
| 24 // true if successful. | 26 // true if successful. |
| 25 static bool EnableReceiveProcessId(int fd); | 27 static bool EnableReceiveProcessId(int fd); |
| 26 | 28 |
| 27 // Use sendmsg to write the given msg and include a vector of file | 29 // Use sendmsg to write the given msg and include a vector of file |
| 28 // descriptors. Returns true if successful. | 30 // descriptors. Returns true if successful. |
| 29 static bool SendMsg(int fd, | 31 static bool SendMsg(int fd, |
| 30 const void* msg, | 32 const void* msg, |
| 31 size_t length, | 33 size_t length, |
| 32 const std::vector<int>& fds); | 34 const std::vector<int>& fds); |
| 33 | 35 |
| 34 // Use recvmsg to read a message and an array of file descriptors. Returns | 36 // Use recvmsg to read a message and an array of file descriptors. Returns |
| 35 // -1 on failure. Note: will read, at most, |kMaxFileDescriptors| descriptors. | 37 // -1 on failure. Note: will read, at most, |kMaxFileDescriptors| descriptors. |
| 36 static ssize_t RecvMsg(int fd, | 38 static ssize_t RecvMsg(int fd, |
| 37 void* msg, | 39 void* msg, |
| 38 size_t length, | 40 size_t length, |
| 39 std::vector<int>* fds); | 41 ScopedVector<base::ScopedFD>* fds); |
| 40 | 42 |
| 41 // Same as RecvMsg above, but also returns the sender's process ID (as seen | 43 // Same as RecvMsg above, but also returns the sender's process ID (as seen |
| 42 // from the caller's namespace). However, before using this function to | 44 // from the caller's namespace). However, before using this function to |
| 43 // receive process IDs, EnableReceiveProcessId() should be called on the | 45 // receive process IDs, EnableReceiveProcessId() should be called on the |
| 44 // receiving socket. | 46 // receiving socket. |
| 45 static ssize_t RecvMsgWithPid(int fd, | 47 static ssize_t RecvMsgWithPid(int fd, |
| 46 void* msg, | 48 void* msg, |
| 47 size_t length, | 49 size_t length, |
| 48 std::vector<int>* fds, | 50 ScopedVector<base::ScopedFD>* fds, |
| 49 base::ProcessId* pid); | 51 base::ProcessId* pid); |
| 50 | 52 |
| 51 // Perform a sendmsg/recvmsg pair. | 53 // Perform a sendmsg/recvmsg pair. |
| 52 // 1. This process creates a UNIX SEQPACKET socketpair. Using | 54 // 1. This process creates a UNIX SEQPACKET socketpair. Using |
| 53 // connection-oriented sockets (SEQPACKET or STREAM) is critical here, | 55 // connection-oriented sockets (SEQPACKET or STREAM) is critical here, |
| 54 // because if one of the ends closes the other one must be notified. | 56 // because if one of the ends closes the other one must be notified. |
| 55 // 2. This process writes a request to |fd| with an SCM_RIGHTS control | 57 // 2. This process writes a request to |fd| with an SCM_RIGHTS control |
| 56 // message containing on end of the fresh socket pair. | 58 // message containing on end of the fresh socket pair. |
| 57 // 3. This process blocks reading from the other end of the fresh | 59 // 3. This process blocks reading from the other end of the fresh |
| 58 // socketpair. | 60 // socketpair. |
| (...skipping 20 matching lines...) Expand all Loading... |
| 79 unsigned reply_len, | 81 unsigned reply_len, |
| 80 int recvmsg_flags, | 82 int recvmsg_flags, |
| 81 int* result_fd, | 83 int* result_fd, |
| 82 const Pickle& request); | 84 const Pickle& request); |
| 83 private: | 85 private: |
| 84 // Similar to RecvMsg, but allows to specify |flags| for recvmsg(2). | 86 // Similar to RecvMsg, but allows to specify |flags| for recvmsg(2). |
| 85 static ssize_t RecvMsgWithFlags(int fd, | 87 static ssize_t RecvMsgWithFlags(int fd, |
| 86 void* msg, | 88 void* msg, |
| 87 size_t length, | 89 size_t length, |
| 88 int flags, | 90 int flags, |
| 89 std::vector<int>* fds, | 91 ScopedVector<base::ScopedFD>* fds, |
| 90 base::ProcessId* pid); | 92 base::ProcessId* pid); |
| 91 }; | 93 }; |
| 92 | 94 |
| 93 #endif // BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ | 95 #endif // BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ |
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