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775e6d6865
This syscall operates on the file descriptor table, and on individual open file descriptions. Both of those are already protected by scoped locking mechanisms.
61 lines
1.9 KiB
C++
61 lines
1.9 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/OpenFileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$fcntl(int fd, int cmd, uintptr_t arg)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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dbgln_if(IO_DEBUG, "sys$fcntl: fd={}, cmd={}, arg={}", fd, cmd, arg);
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auto description = TRY(open_file_description(fd));
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// NOTE: The FD flags are not shared between OpenFileDescription objects.
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// This means that dup() doesn't copy the FD_CLOEXEC flag!
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switch (cmd) {
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case F_DUPFD_CLOEXEC:
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case F_DUPFD: {
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int arg_fd = (int)arg;
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if (arg_fd < 0)
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return EINVAL;
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return m_fds.with_exclusive([&](auto& fds) -> ErrorOr<FlatPtr> {
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auto fd_allocation = TRY(fds.allocate(arg_fd));
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fds[fd_allocation.fd].set(*description, (cmd == F_DUPFD_CLOEXEC) ? FD_CLOEXEC : 0);
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return fd_allocation.fd;
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});
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}
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case F_GETFD:
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return m_fds.with_exclusive([fd](auto& fds) { return fds[fd].flags(); });
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case F_SETFD:
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m_fds.with_exclusive([fd, arg](auto& fds) { fds[fd].set_flags(arg); });
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break;
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case F_GETFL:
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return description->file_flags();
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case F_SETFL:
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description->set_file_flags(arg);
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break;
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case F_ISTTY:
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return description->is_tty();
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case F_GETLK:
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TRY(description->get_flock(Userspace<flock*>(arg)));
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return 0;
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case F_SETLK:
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TRY(description->apply_flock(Process::current(), Userspace<flock const*>(arg), ShouldBlock::No));
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return 0;
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case F_SETLKW:
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TRY(description->apply_flock(Process::current(), Userspace<flock const*>(arg), ShouldBlock::Yes));
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return 0;
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default:
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return EINVAL;
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}
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return 0;
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}
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}
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