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I386_GET_LDT(2) FreeBSD System Calls Manual (i386) 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. FreeBSD 14.1-RELEASE-p8 September 20, 1993 FreeBSD 14.1-RELEASE-p8