2a78bf8596
The Process::Handler type has KResultOr<FlatPtr> as its return type. Using a different return type with an equally-sized template parameter sort of works but breaks once that condition is no longer true, e.g. for KResultOr<int> on x86_64. Ideally the syscall handlers would also take FlatPtrs as their args so we can get rid of the reinterpret_cast for the function pointer but I didn't quite feel like cleaning that up as well.
90 lines
2.4 KiB
C++
90 lines
2.4 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/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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KResultOr<FlatPtr> Process::sys$open(Userspace<const Syscall::SC_open_params*> user_params)
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{
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Syscall::SC_open_params params;
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if (!copy_from_user(¶ms, user_params))
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return EFAULT;
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int dirfd = params.dirfd;
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int options = params.options;
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u16 mode = params.mode;
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if (options & O_NOFOLLOW_NOERROR)
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return EINVAL;
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if (options & O_UNLINK_INTERNAL)
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return EINVAL;
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if (options & O_WRONLY)
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REQUIRE_PROMISE(wpath);
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else if (options & O_RDONLY)
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REQUIRE_PROMISE(rpath);
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if (options & O_CREAT)
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REQUIRE_PROMISE(cpath);
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// Ignore everything except permission bits.
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mode &= 0777;
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auto path = get_syscall_path_argument(params.path);
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if (path.is_error())
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return path.error();
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dbgln_if(IO_DEBUG, "sys$open(dirfd={}, path='{}', options={}, mode={})", dirfd, path.value()->view(), options, mode);
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int fd = alloc_fd();
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if (fd < 0)
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return fd;
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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 = file_description(dirfd);
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if (!base_description)
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return EBADF;
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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 result = VFS::the().open(path.value()->view(), options, mode & ~umask(), *base);
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if (result.is_error())
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return result.error();
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auto description = result.value();
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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].set(move(description), fd_flags);
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return fd;
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}
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KResultOr<FlatPtr> Process::sys$close(int fd)
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{
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REQUIRE_PROMISE(stdio);
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auto description = file_description(fd);
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dbgln_if(IO_DEBUG, "sys$close({}) {}", fd, description.ptr());
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if (!description)
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return EBADF;
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int rc = description->close();
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m_fds[fd] = {};
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return rc;
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}
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}
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