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https://github.com/LadybirdBrowser/ladybird.git
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cf271183b4
This has several benefits: 1) We no longer just blindly derefence a null pointer in various places 2) We will get nicer runtime error messages if the current process does turn out to be null in the call location 3) GCC no longer complains about possible nullptr dereferences when compiling without KUBSAN
57 lines
1.6 KiB
C++
57 lines
1.6 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/FileDescription.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$fcntl(int fd, int cmd, u32 arg)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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REQUIRE_PROMISE(stdio);
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dbgln_if(IO_DEBUG, "sys$fcntl: fd={}, cmd={}, arg={}", fd, cmd, arg);
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auto description = fds().file_description(fd);
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if (!description)
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return EBADF;
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// NOTE: The FD flags are not shared between FileDescription 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: {
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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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auto new_fd_or_error = fds().allocate(arg_fd);
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if (new_fd_or_error.is_error())
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return new_fd_or_error.error();
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auto new_fd = new_fd_or_error.release_value();
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m_fds[new_fd.fd].set(*description);
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return new_fd.fd;
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}
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case F_GETFD:
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return m_fds[fd].flags();
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case F_SETFD:
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m_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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return description->get_flock(Userspace<flock*>(arg));
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case F_SETLK:
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return description->apply_flock(Process::current(), Userspace<const flock*>(arg));
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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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