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-.\" Copyright (c) 1980, 1991 Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
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-.\" 2. Redistributions in binary form must reproduce the above copyright
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-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-.\"
-.\"     from: @(#)fork.2	6.5 (Berkeley) 3/10/91
-.\" $FreeBSD$
-.\"
-.Dd October 14, 2006
-.Dt I386_GET_LDT 2
-.Os
-.Sh NAME
-.Nm i386_get_ldt ,
-.Nm i386_set_ldt
-.Nd manage i386 per-process Local Descriptor Table entries
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In machine/segments.h
-.In machine/sysarch.h
-.Ft int
-.Fn i386_get_ldt "int start_sel" "union descriptor *descs" "int num_sels"
-.Ft int
-.Fn i386_set_ldt "int start_sel" "union descriptor *descs" "int num_sels"
-.Sh DESCRIPTION
-The
-.Fn i386_get_ldt
-system call
-returns a list of the i386 descriptors in the current process'
-LDT.
-The
-.Fn i386_set_ldt
-system call
-sets a list of i386 descriptors in the current process'
-LDT.
-For both routines,
-.Fa start_sel
-specifies the index of the selector in the LDT at which to begin and
-.Fa descs
-points to an array of
-.Fa num_sels
-descriptors to be set or returned.
-.Pp
-Each entry in the
-.Fa descs
-array can be either a segment_descriptor or gate_descriptor and are defined in
-.In i386/segments.h .
-These structures are defined by the architecture
-as disjoint bit-fields, so care must be taken in constructing them.
-.Pp
-If
-.Fa start_sel
-is
-.Em LDT_AUTO_ALLOC ,
-.Fa num_sels
-is 1 and the descriptor pointed to by
-.Fa descs
-is legal, then
-.Fn i386_set_ldt
-will allocate a descriptor and return its
-selector number.
-.Pp
-If
-.Fa num_descs
-is 1,
-.Fa start_sels
-is valid, and
-.Fa descs
-is NULL, then
-.Fn i386_set_ldt
-will free that descriptor
-(making it available to be reallocated again later).
-.Pp
-If
-.Fa num_descs
-is 0,
-.Fa start_sels
-is 0 and
-.Fa descs
-is NULL then, as a special case,
-.Fn i386_set_ldt
-will free all descriptors.
-.Sh RETURN VALUES
-Upon successful completion,
-.Fn i386_get_ldt
-returns the number of descriptors currently in the LDT.
-The
-.Fn i386_set_ldt
-system call
-returns the first selector set on success.
-If the kernel allocated a descriptor in the LDT,
-the allocated index is returned.
-Otherwise, a value of -1 is returned and the global
-variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn i386_get_ldt
-and
-.Fn i386_set_ldt
-system calls
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-An inappropriate value was used for
-.Fa start_sel
-or
-.Fa num_sels .
-.It Bq Er EACCES
-The caller attempted to use a descriptor that would
-circumvent protection or cause a failure.
-.El
-.Sh SEE ALSO
-i386 Microprocessor Programmer's Reference Manual, Intel
-.Sh WARNING
-You can really hose your process using this.