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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" | 13 #include "base/files/scoped_file.h" |
14 #include "base/memory/scoped_vector.h" | 14 #include "base/memory/scoped_vector.h" |
15 #include "base/process/process_handle.h" | 15 #include "base/process/process_handle.h" |
16 | 16 |
17 class Pickle; | 17 class Pickle; |
18 | 18 |
19 class BASE_EXPORT UnixDomainSocket { | 19 class BASE_EXPORT UnixDomainSocket { |
20 public: | 20 public: |
21 // Maximum number of file descriptors that can be read by RecvMsg(). | 21 // Maximum number of file descriptors that can be read by RecvMsg(). |
22 static const size_t kMaxFileDescriptors; | 22 static const size_t kMaxFileDescriptors; |
23 | 23 |
24 #if !defined(__native_client_nonsfi__) | 24 #if !defined(OS_NACL_NONSFI) |
25 // Use to enable receiving process IDs in RecvMsgWithPid. Should be called on | 25 // Use to enable receiving process IDs in RecvMsgWithPid. Should be called on |
26 // the receiving socket (i.e., the socket passed to RecvMsgWithPid). Returns | 26 // the receiving socket (i.e., the socket passed to RecvMsgWithPid). Returns |
27 // true if successful. | 27 // true if successful. |
28 static bool EnableReceiveProcessId(int fd); | 28 static bool EnableReceiveProcessId(int fd); |
29 #endif // !defined(__native_client_nonsfi__) | 29 #endif // !defined(OS_NACL_NONSFI) |
30 | 30 |
31 // Use sendmsg to write the given msg and include a vector of file | 31 // Use sendmsg to write the given msg and include a vector of file |
32 // descriptors. Returns true if successful. | 32 // descriptors. Returns true if successful. |
33 static bool SendMsg(int fd, | 33 static bool SendMsg(int fd, |
34 const void* msg, | 34 const void* msg, |
35 size_t length, | 35 size_t length, |
36 const std::vector<int>& fds); | 36 const std::vector<int>& fds); |
37 | 37 |
38 // Use recvmsg to read a message and an array of file descriptors. Returns | 38 // Use recvmsg to read a message and an array of file descriptors. Returns |
39 // -1 on failure. Note: will read, at most, |kMaxFileDescriptors| descriptors. | 39 // -1 on failure. Note: will read, at most, |kMaxFileDescriptors| descriptors. |
40 static ssize_t RecvMsg(int fd, | 40 static ssize_t RecvMsg(int fd, |
41 void* msg, | 41 void* msg, |
42 size_t length, | 42 size_t length, |
43 ScopedVector<base::ScopedFD>* fds); | 43 ScopedVector<base::ScopedFD>* fds); |
44 | 44 |
45 // Same as RecvMsg above, but also returns the sender's process ID (as seen | 45 // Same as RecvMsg above, but also returns the sender's process ID (as seen |
46 // from the caller's namespace). However, before using this function to | 46 // from the caller's namespace). However, before using this function to |
47 // receive process IDs, EnableReceiveProcessId() should be called on the | 47 // receive process IDs, EnableReceiveProcessId() should be called on the |
48 // receiving socket. | 48 // receiving socket. |
49 static ssize_t RecvMsgWithPid(int fd, | 49 static ssize_t RecvMsgWithPid(int fd, |
50 void* msg, | 50 void* msg, |
51 size_t length, | 51 size_t length, |
52 ScopedVector<base::ScopedFD>* fds, | 52 ScopedVector<base::ScopedFD>* fds, |
53 base::ProcessId* pid); | 53 base::ProcessId* pid); |
54 | 54 |
55 #if !defined(__native_client_nonsfi__) | 55 #if !defined(OS_NACL_NONSFI) |
56 // Perform a sendmsg/recvmsg pair. | 56 // Perform a sendmsg/recvmsg pair. |
57 // 1. This process creates a UNIX SEQPACKET socketpair. Using | 57 // 1. This process creates a UNIX SEQPACKET socketpair. Using |
58 // connection-oriented sockets (SEQPACKET or STREAM) is critical here, | 58 // connection-oriented sockets (SEQPACKET or STREAM) is critical here, |
59 // because if one of the ends closes the other one must be notified. | 59 // because if one of the ends closes the other one must be notified. |
60 // 2. This process writes a request to |fd| with an SCM_RIGHTS control | 60 // 2. This process writes a request to |fd| with an SCM_RIGHTS control |
61 // message containing on end of the fresh socket pair. | 61 // message containing on end of the fresh socket pair. |
62 // 3. This process blocks reading from the other end of the fresh | 62 // 3. This process blocks reading from the other end of the fresh |
63 // socketpair. | 63 // socketpair. |
64 // 4. The target process receives the request, processes it and writes the | 64 // 4. The target process receives the request, processes it and writes the |
65 // reply to the end of the socketpair contained in the request. | 65 // reply to the end of the socketpair contained in the request. |
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78 const Pickle& request); | 78 const Pickle& request); |
79 | 79 |
80 // Similar to SendRecvMsg(), but |recvmsg_flags| allows to control the flags | 80 // Similar to SendRecvMsg(), but |recvmsg_flags| allows to control the flags |
81 // of the recvmsg(2) call. | 81 // of the recvmsg(2) call. |
82 static ssize_t SendRecvMsgWithFlags(int fd, | 82 static ssize_t SendRecvMsgWithFlags(int fd, |
83 uint8_t* reply, | 83 uint8_t* reply, |
84 unsigned reply_len, | 84 unsigned reply_len, |
85 int recvmsg_flags, | 85 int recvmsg_flags, |
86 int* result_fd, | 86 int* result_fd, |
87 const Pickle& request); | 87 const Pickle& request); |
88 #endif // !defined(__native_client_nonsfi__) | 88 #endif // !defined(OS_NACL_NONSFI) |
89 private: | 89 private: |
90 // Similar to RecvMsg, but allows to specify |flags| for recvmsg(2). | 90 // Similar to RecvMsg, but allows to specify |flags| for recvmsg(2). |
91 static ssize_t RecvMsgWithFlags(int fd, | 91 static ssize_t RecvMsgWithFlags(int fd, |
92 void* msg, | 92 void* msg, |
93 size_t length, | 93 size_t length, |
94 int flags, | 94 int flags, |
95 ScopedVector<base::ScopedFD>* fds, | 95 ScopedVector<base::ScopedFD>* fds, |
96 base::ProcessId* pid); | 96 base::ProcessId* pid); |
97 }; | 97 }; |
98 | 98 |
99 #endif // BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ | 99 #endif // BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ |
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