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https://github.com/SerenityOS/serenity
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a9204510a4
Instead of checking it at every call site (to generate EBADF), we make file_description(fd) return a KResultOr<NonnullRefPtr<FileDescription>>. This allows us to wrap all the calls in TRY(). :^) The only place that got a little bit messier from this is sys$mount(), and there's a whole bunch of things there in need of cleanup.
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$open(Userspace<const Syscall::SC_open_params*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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auto params = TRY(copy_typed_from_user(user_params));
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int dirfd = params.dirfd;
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int options = params.options;
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u16 mode = params.mode;
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if (options & O_NOFOLLOW_NOERROR)
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return EINVAL;
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if (options & O_UNLINK_INTERNAL)
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return EINVAL;
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if (options & O_WRONLY)
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REQUIRE_PROMISE(wpath);
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else if (options & O_RDONLY)
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REQUIRE_PROMISE(rpath);
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if (options & O_CREAT)
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REQUIRE_PROMISE(cpath);
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// Ignore everything except permission bits.
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mode &= 0777;
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auto path = TRY(get_syscall_path_argument(params.path));
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dbgln_if(IO_DEBUG, "sys$open(dirfd={}, path='{}', options={}, mode={})", dirfd, path->view(), options, mode);
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auto fd_allocation = TRY(m_fds.allocate());
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RefPtr<Custody> base;
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if (dirfd == AT_FDCWD) {
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base = current_directory();
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} else {
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auto base_description = TRY(fds().file_description(dirfd));
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if (!base_description->is_directory())
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return ENOTDIR;
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if (!base_description->custody())
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return EINVAL;
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base = base_description->custody();
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}
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auto description = TRY(VirtualFileSystem::the().open(path->view(), options, mode & ~umask(), *base));
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if (description->inode() && description->inode()->socket())
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return ENXIO;
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u32 fd_flags = (options & O_CLOEXEC) ? FD_CLOEXEC : 0;
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m_fds[fd_allocation.fd].set(move(description), fd_flags);
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return fd_allocation.fd;
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}
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KResultOr<FlatPtr> Process::sys$close(int fd)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(stdio);
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auto description = TRY(fds().file_description(fd));
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auto result = description->close();
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m_fds[fd] = {};
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return result;
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}
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}
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