__dpmi_get_descriptor

Syntax

#include <dpmi.h>

int __dpmi_get_descriptor(int _selector, void *_buffer);

Description

Please refer to section DPMI Specification for details on DPMI function call operation. Also see section DPMI Overview for general information.

DPMI function AX = 0x000b

This function fills a 8-byte buffer with the parameters of the descriptor. The data has the following format:

[0] XXXX XXXX = segment limit [7:0]
[1] XXXX XXXX = segment limit [15:8]
[2] XXXX XXXX = base address [7:0]
[3] XXXX XXXX = base address [15:8]
[4] XXXX XXXX = base address [23:16]
[5] ---- XXXX = type
[5] ---X ---- = 0=system, 1=application
[5] -XX- ---- = priviledge level
[5] X--- ---- = 0=absent, 1=present
[6] ---- XXXX = segment limit [19:16]
[6] ---X ---- = available for user
[6] --0- ---- = must be zero
[6] -X-- ---- = 0=16-bit 1=32-bit (cs only)
[6] X--- ---- = 0=byte-granular (small) 1=page-granular (big)
[7] XXXX XXXX = base address [31:24]

Return Value

-1 on error, else zero.

Portability

not ANSI, not POSIX

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