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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
52 lines
1.3 KiB
C++
52 lines
1.3 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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int new_fd = fds().allocate(arg_fd);
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if (new_fd < 0)
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return new_fd;
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m_fds[new_fd].set(*description);
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return new_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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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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