mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2025-12-06 17:58:23 +01:00
59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "memlet_service.hpp"
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namespace ams::memlet {
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Result Service::CreateAppletSharedMemory(sf::Out<u64> out_size, sf::OutMoveHandle out_handle, u64 desired_size) {
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/* Create a handle to set the output to when done. */
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os::NativeHandle handle = os::InvalidNativeHandle;
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ON_SCOPE_EXIT { out_handle.SetValue(handle, true); };
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/* Check that the requested size has megabyte alignment and isn't too big. */
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R_UNLESS(util::IsAligned(desired_size, 1_MB), os::ResultInvalidParameter());
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R_UNLESS(desired_size <= 128_MB, os::ResultInvalidParameter());
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/* Try to create a shared memory of the desired size, giving up 1 MB each iteration. */
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os::SharedMemoryType shmem = {};
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while (true) {
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/* If we have zero desired-size left, we've failed. */
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R_UNLESS(desired_size > 0, os::ResultOutOfMemory());
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/* Try to create a shared memory. */
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if (R_FAILED(os::CreateSharedMemory(std::addressof(shmem), desired_size, os::MemoryPermission_ReadWrite, os::MemoryPermission_ReadWrite))) {
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/* We failed, so decrease the size to see if that works. */
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desired_size -= 1_MB;
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continue;
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}
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/* We successfully created the shared memory. */
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break;
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}
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/* Get the native handle for the shared memory we created. */
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handle = os::GetSharedMemoryHandle(std::addressof(shmem));
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/* HACK: Clear the shared memory object, since we've stolen its handle, and there's no "correct" way to detach. */
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shmem = {};
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/* We successfully created a shared memory! */
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*out_size = desired_size;
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R_SUCCEED();
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}
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}
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