netbsd man page for i386_set_ldt

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

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

LIBRARY
     i386 Architecture Library (libi386, -li386)

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

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

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

DESCRIPTION
     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 num_sels.

     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.

RETURN VALUES
     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.

ERRORS
     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.

REFERENCES
     i386 Microprocessor Programmer's Reference Manual, Intel

WARNING
     You can really hose your process using this.

BSD
								September 20, 1993							       BSD