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comparison: ipc/glue/SharedMemorySysV.h
ipc/glue/SharedMemorySysV.h
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- TOR_BUG_9701
- changeset 15
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| -1:000000000000 | 0:774180047b15 |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * vim: sw=2 ts=8 et : | |
| 3 */ | |
| 4 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 5 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 7 | |
| 8 #ifndef mozilla_ipc_SharedMemorySysV_h | |
| 9 #define mozilla_ipc_SharedMemorySysV_h | |
| 10 | |
| 11 #if (defined(OS_LINUX) && !defined(ANDROID)) || defined(OS_BSD) | |
| 12 | |
| 13 // SysV shared memory isn't available on Windows, but we define the | |
| 14 // following macro so that #ifdefs are clearer (compared to #ifdef | |
| 15 // OS_LINUX). | |
| 16 #define MOZ_HAVE_SHAREDMEMORYSYSV | |
| 17 | |
| 18 #include "SharedMemory.h" | |
| 19 | |
| 20 #include "nsDebug.h" | |
| 21 | |
| 22 #include <errno.h> | |
| 23 #include <fcntl.h> | |
| 24 #include <stdio.h> | |
| 25 #include <string.h> | |
| 26 #include <sys/ipc.h> | |
| 27 #include <sys/shm.h> | |
| 28 | |
| 29 // | |
| 30 // This is a low-level wrapper around platform shared memory. Don't | |
| 31 // use it directly; use Shmem allocated through IPDL interfaces. | |
| 32 // | |
| 33 | |
| 34 namespace mozilla { | |
| 35 namespace ipc { | |
| 36 | |
| 37 | |
| 38 class SharedMemorySysV : public SharedMemory | |
| 39 { | |
| 40 public: | |
| 41 typedef int Handle; | |
| 42 | |
| 43 SharedMemorySysV() : | |
| 44 mHandle(-1), | |
| 45 mData(nullptr) | |
| 46 { | |
| 47 } | |
| 48 | |
| 49 SharedMemorySysV(Handle aHandle) : | |
| 50 mHandle(aHandle), | |
| 51 mData(nullptr) | |
| 52 { | |
| 53 } | |
| 54 | |
| 55 virtual ~SharedMemorySysV() | |
| 56 { | |
| 57 shmdt(mData); | |
| 58 mHandle = -1; | |
| 59 mData = nullptr; | |
| 60 } | |
| 61 | |
| 62 virtual bool Create(size_t aNbytes) MOZ_OVERRIDE | |
| 63 { | |
| 64 int id = shmget(IPC_PRIVATE, aNbytes, IPC_CREAT | 0600); | |
| 65 if (id == -1) | |
| 66 return false; | |
| 67 | |
| 68 mHandle = id; | |
| 69 mAllocSize = aNbytes; | |
| 70 Created(aNbytes); | |
| 71 | |
| 72 return Map(aNbytes); | |
| 73 } | |
| 74 | |
| 75 virtual bool Map(size_t nBytes) MOZ_OVERRIDE | |
| 76 { | |
| 77 // already mapped | |
| 78 if (mData) | |
| 79 return true; | |
| 80 | |
| 81 if (!IsHandleValid(mHandle)) | |
| 82 return false; | |
| 83 | |
| 84 void* mem = shmat(mHandle, nullptr, 0); | |
| 85 if (mem == (void*) -1) { | |
| 86 char warning[256]; | |
| 87 ::snprintf(warning, sizeof(warning)-1, | |
| 88 "shmat(): %s (%d)\n", strerror(errno), errno); | |
| 89 | |
| 90 NS_WARNING(warning); | |
| 91 | |
| 92 return false; | |
| 93 } | |
| 94 | |
| 95 // Mark the handle as deleted so that, should this process go away, the | |
| 96 // segment is cleaned up. | |
| 97 shmctl(mHandle, IPC_RMID, 0); | |
| 98 | |
| 99 mData = mem; | |
| 100 | |
| 101 #ifdef DEBUG | |
| 102 struct shmid_ds info; | |
| 103 if (shmctl(mHandle, IPC_STAT, &info) < 0) | |
| 104 return false; | |
| 105 | |
| 106 NS_ABORT_IF_FALSE(nBytes <= info.shm_segsz, | |
| 107 "Segment doesn't have enough space!"); | |
| 108 #endif | |
| 109 | |
| 110 Mapped(nBytes); | |
| 111 return true; | |
| 112 } | |
| 113 | |
| 114 virtual void* memory() const MOZ_OVERRIDE | |
| 115 { | |
| 116 return mData; | |
| 117 } | |
| 118 | |
| 119 virtual SharedMemoryType Type() const MOZ_OVERRIDE | |
| 120 { | |
| 121 return TYPE_SYSV; | |
| 122 } | |
| 123 | |
| 124 Handle GetHandle() const | |
| 125 { | |
| 126 NS_ABORT_IF_FALSE(IsHandleValid(mHandle), "invalid handle"); | |
| 127 return mHandle; | |
| 128 } | |
| 129 | |
| 130 static Handle NULLHandle() | |
| 131 { | |
| 132 return -1; | |
| 133 } | |
| 134 | |
| 135 static bool IsHandleValid(Handle aHandle) | |
| 136 { | |
| 137 return aHandle != -1; | |
| 138 } | |
| 139 | |
| 140 private: | |
| 141 Handle mHandle; | |
| 142 void* mData; | |
| 143 }; | |
| 144 | |
| 145 } // namespace ipc | |
| 146 } // namespace mozilla | |
| 147 | |
| 148 #endif // OS_LINUX | |
| 149 | |
| 150 #endif // ifndef mozilla_ipc_SharedMemorySysV_h |
