FreeBSD/Linux Kernel Cross Reference
sys/conf/std

     # $NetBSD: std,v 1.23 2019/01/27 02:08:41 pgoyette Exp $
     #
     # standard MI 'options'
     #
     # this file is for options which can't be off-by-default for some reasons.
     # "it's commonly used" is NOT a good reason to enable options here.
     
     #
     # Always include "kern" attribute (module).  Other attributes don't need to
    # depend on "kern".
    #
    select  kern
    
    # Always include the "vfs" attribute (module).  Although all of the
    # ufs/xxx file systems depend on the vfs attribute, it is not required
    # that any file system actually be built-in to the kernel.  (At least
    # on some architectures, file system modules can be loaded at boot
    # time.)
    
    select vfs
    
    select  net             # XXX Clean up dependency
    
    # the following options are on-by-default to keep
    # kernel config file compatibility.
    options VMSWAP          # Swap device/file support
    options BUFQ_FCFS       # First-come First-serve strategy
    options BUFQ_DISKSORT   # Traditional min seek sort strategy
    options RFC2292         # Previous version of Adv. Sockets API for IPv6 
    options PTRACE          # Include ptrace(2) syscall
    options PTRACE_HOOKS    # Include ptrace hooks
    options COREDUMP        # allow processes to coredump.
    options AIO             # POSIX asynchronous I/O
    options MQUEUE          # POSIX message queues
    
    # Common compatibility functions. They happen to be needed even when
    # no compatibility option is explicitly enabled.
    #
    options        COMPAT_UTILS
    
    #
    # Security model.
    #
    options secmodel_bsd44  # Traditional 4.4BSD security model
    
    #
    # Scheduling algorithm
    #
    options SCHED_4BSD
    
    pseudo-device   cpuctl
    
    #
    # Kernel entropy pool and random-number generator pseudodevice.
    # The pseudodevice might stop being "std" when the two are torn
    # apart some day but the entropy pool itself never will (they are
    # presently implemented in the same source file)
    #
    pseudo-device   rnd

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