#include <dos.h> int int86(int ivec, union REGS *in, union REGS *out);
Note: The .x. branch is a problem generator. Most code expects
the .x. branch to have e.g. ".x.ax" members, and that
they are 16-bit. If you know you want 32-bit values, use the
.d.eax members. If you know you want 16-bit values, use the
.w.ax members. The .x. members behave according to
#defines, as follows:
default
#define, the .x. branch has
"ax" members and is 32-bit. This is compatible with previous
versions of djgpp.
_NAIVE_DOS_REGS
.x.ax, but they are 16-bit. This is
probably what most programs ported from 16-bit dos compilers will
want.
_BORLAND_DOS_REGS
.x.eax which are 32-bit. This is
compatible with Borland's 32-bit compilers.
This function simulates a software interrupt. Note that, unlike the
__dpmi_int function, requests that go through int86
and similar functions are specially processed to make them suitable for
invoking real-mode interrupts from protected-mode programs. For example,
if a particular routine takes a pointer in BX, int86 expects
you to put a (protected-mode) pointer in EBX. Therefore,
int86 should have specific support for every interrupt and function
you invoke this way. Currently, it supports only a subset of all
available interrupts and functions:
1) All functions of any interrupt which expects only scalar arguments registers (i.e., no pointers to buffers).
2) In addition, the following functions of interrupt 21h are supported: 9, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Fh, 40h, 41h, 43h, 47h, 56h.
When the interrupt is invoked, the CPU registers are copied from in. After the interrupt, the CPU registers are copied to out.
This function is just like int86x (see section int86x) except that
suitable default values are used for the segment registers.
See section int86x. See section intdos. See section bdos.
The returned value of EAX.
not ANSI, not POSIX
union REGS r; r.x.ax = 0x0100; r.h.dl = 'c'; int86(0x21, &r, &r);
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