i386_set_ldt man page on OpenBSD

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I386_GET_LDT(2)	      OpenBSD Programmer's Manual (i386)       I386_GET_LDT(2)

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

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() returns a list of the i386 descriptors in the current
     process' LDT.  i386_set_ldt() sets a list of i386 descriptors in the
     current process' LDT.  For both routines, start_sel specifies the index
     of the selector in the LDT at which to begin and descs points to an array
     of num_sels descriptors to be set or returned.

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

     Before this API can be used the functionality has to be enabled using the
     machdep.userldt sysctl(8) variable.

     Note: Code using the i386_get_ldt() and i386_set_ldt() functions must be
     compiled using -li386.

RETURN VALUES
     Upon successful completion, i386_get_ldt() returns the number of i386
     descriptors copied into descs from the current process' LDT.  Otherwise,
     a value of -1 is returned and the global variable errno is set to
     indicate the error.

     Upon successful completion, i386_set_ldt() returns the first selector
     set; 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 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
     Intel, i386 Microprocessor Programmer's Reference Manual.

WARNING
     You can really hose your process using this.

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9
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