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33 .\" $FreeBSD: src/lib/libc/i386/sys/i386_get_ldt.2,v 1.6.2.7 2001/12/14 18:33:54 ru Exp $
34 .\" $DragonFly: src/lib/libc/i386/sys/i386_get_ldt.2,v 1.4 2006/03/26 22:56:56 swildner Exp $
36 .Dd September 20, 1993
42 .Nd manage i386 per-process Local Descriptor Table entries
46 .In machine/segments.h
49 .Fn i386_get_ldt "int start_sel" "union descriptor *descs" "int num_sels"
51 .Fn i386_set_ldt "int start_sel" "union descriptor *descs" "int num_sels"
54 will return the list of i386 descriptors that the process has in its
57 will set a list of i386 descriptors for the current process in its
59 Both routines accept a starting selector number
61 an array of memory that
62 will contain the descriptors to be set or returned
64 and the number of entries to set or return
69 can be either segment_descriptor or gate_descriptor and are defined in
70 .Aq Pa i386/segments.h .
71 These structures are defined by the architecture
72 as disjoint bit-fields, so care must be taken in constructing them.
74 Upon successful completion,
76 returns the number of descriptors currently in the LDT.
78 returns the first selector set.
79 Otherwise, a value of -1 is returned and the global
82 is set to indicate the error.
90 An inappropriate parameter was used for
95 The caller attempted to use a descriptor that would
96 circumvent protection or cause a failure.
99 i386 Microprocessor Programmer's Reference Manual, Intel
101 You can really hose your process using this.