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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /ipc/glue/SharedMemory_posix.cpp | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | ipc/glue/SharedMemory_posix.cpp | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/ipc/glue/SharedMemory_posix.cpp b/ipc/glue/SharedMemory_posix.cpp new file mode 100644 index 0000000000..b634058945 --- /dev/null +++ b/ipc/glue/SharedMemory_posix.cpp @@ -0,0 +1,55 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include <sys/mman.h> // mprotect +#include <unistd.h> // sysconf + +#include "mozilla/ipc/SharedMemory.h" + +#if defined(XP_MACOSX) && defined(__x86_64__) +# include "prenv.h" +#endif + +namespace mozilla { +namespace ipc { + +#if defined(XP_MACOSX) && defined(__x86_64__) +std::atomic<size_t> sPageSizeOverride = 0; +#endif + +void SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights) { + if (!SystemProtectFallible(aAddr, aSize, aRights)) { + MOZ_CRASH("can't mprotect()"); + } +} + +bool SharedMemory::SystemProtectFallible(char* aAddr, size_t aSize, + int aRights) { + int flags = 0; + if (aRights & RightsRead) flags |= PROT_READ; + if (aRights & RightsWrite) flags |= PROT_WRITE; + if (RightsNone == aRights) flags = PROT_NONE; + + return 0 == mprotect(aAddr, aSize, flags); +} + +size_t SharedMemory::SystemPageSize() { +#if defined(XP_MACOSX) && defined(__x86_64__) + if (sPageSizeOverride == 0) { + if (PR_GetEnv("MOZ_SHMEM_PAGESIZE_16K")) { + sPageSizeOverride = 16 * 1024; + } else { + sPageSizeOverride = sysconf(_SC_PAGESIZE); + } + } + return sPageSizeOverride; +#else + return sysconf(_SC_PAGESIZE); +#endif +} + +} // namespace ipc +} // namespace mozilla |