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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.
31 lines
806 B
C++
31 lines
806 B
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/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$lseek(int fd, Userspace<off_t*> userspace_offset, int whence)
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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 = fds().file_description(fd);
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if (!description)
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return EBADF;
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off_t offset;
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if (!copy_from_user(&offset, userspace_offset))
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return EFAULT;
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auto seek_result = description->seek(offset, whence);
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if (seek_result.is_error())
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return seek_result.error();
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if (!copy_to_user(userspace_offset, &seek_result.value()))
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return EFAULT;
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return KSuccess;
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}
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}
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