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I386_GET_LDT(2) 		   BSD/i386 System Calls Manual 		  I386_GET_LDT(2)

     i386_get_ldt, i386_set_ldt -- manage i386 per-process Local Descriptor Table entries

     i386 Architecture Library (libi386, -li386)

     #include <sys/types.h>
     #include <machine/segments.h>
     #include <machine/sysarch.h>

     i386_get_ldt(int start_sel, union descriptor *descs, int num_sels);

     i386_set_ldt(int start_sel, union descriptor *descs, int num_sels);

     i386_get_ldt() will return the list of i386 descriptors that the process has in its LDT.
     i386_set_ldt() will set a list of i386 descriptors for the current process in its LDT.  Both
     routines accept a starting selector number start_sel , an array of memory that will contain
     the descriptors to be set or returned descs , and the number of entries to set or return

     The argument descs can be either segment_descriptor or gate_descriptor and are defined in
     <i386/segments.h> .
     These structures are defined by the architecture as disjoint bit-fields, so care must be
     taken in constructing them.

     Upon successful completion, i386_get_ldt() returns the number of descriptors currently in
     the LDT.  i386_set_ldt() returns the first selector set.  Otherwise, a value of -1 is
     returned and the global variable errno is set to indicate the error.

     i386_get_ldt() and i386_set_ldt() will fail if:

     [EINVAL]  An inappropriate parameter was used for start_sel or num_sels.

     [EACCES]  The caller attempted to use a descriptor that would circumvent protection or cause
	       a failure.

     i386 Microprocessor Programmer's Reference Manual, Intel

     You can really hose your process using this.

BSD					September 20, 1993				      BSD
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