mirror of
https://github.com/RGBCube/serenity
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ea5825f2c9
This gives us the superpower of knowing the ideal buffer length if it fails. See also https://github.com/SerenityOS/serenity/discussions/4357
78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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int Process::sys$chdir(Userspace<const char*> user_path, size_t path_length)
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{
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REQUIRE_PROMISE(rpath);
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auto path = get_syscall_path_argument(user_path, path_length);
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if (path.is_error())
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return path.error();
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auto directory_or_error = VFS::the().open_directory(path.value(), current_directory());
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if (directory_or_error.is_error())
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return directory_or_error.error();
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m_cwd = *directory_or_error.value();
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return 0;
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}
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int Process::sys$fchdir(int fd)
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{
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REQUIRE_PROMISE(stdio);
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auto description = file_description(fd);
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if (!description)
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return -EBADF;
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if (!description->is_directory())
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return -ENOTDIR;
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if (!description->metadata().may_execute(*this))
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return -EACCES;
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m_cwd = description->custody();
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return 0;
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}
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int Process::sys$getcwd(Userspace<char*> buffer, size_t size)
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{
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REQUIRE_PROMISE(rpath);
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auto path = current_directory().absolute_path();
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size_t ideal_size = path.length() + 1;
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auto size_to_copy = min(ideal_size, size);
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if (!copy_to_user(buffer, path.characters(), size_to_copy))
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return -EFAULT;
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// Note: we return the whole size here, not the copied size.
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return ideal_size;
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}
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}
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