INT86(DOS) XENIX System V INT86(DOS)
Name
int86 - Executes an interrupt.
Syntax
#include <dos.h>
int int86(intno, inregs, outregs);
int intno;
union REGS *inregs;
union REGS *outregs;
Description
The int86 function executes the 8086 software interrupt
specified by the interrupt number intno. Before executing
the interrupt, int86 copies the contents of inregs to the
corresponding registers. After the interrupt returns, the
function copies the current register values to outregs. It
also copies the status of the system carry flag to the cflag
field in outregs. The inregs and outregs arguments are
unions of type REGS. The union type is defined in the
include file dos.h.
Int86 is intended to be used to invoke DOS interrupts
directly.
Return Value
The return value is the value in the AX register after the
interrupt returns. If the flag field in outregs is nonzero,
an error has occurred and the doserrno variable is also set
to the corresponding error code.
See Also
bdos(DOS), intdos(DOS), intdosx(DOS), int86x(DOS)
Page 1 (printed 8/7/87)
INT86(DOS) XENIX System V INT86(DOS)
Example
#include <signal.h> #include <dos.h> #include <stdio.h>
#include <process.h>
/*
* Use int86 routine to generate a CONTROL-C interrupt
* (interrupt number 0x23) which would be caught by the
* interrupt handling routine inthandler. Note that the
* values in the regs struct do not matter for this
* interrupt.
*/
#define CNTRLC 0x23 int inthandler (int); union REGS regs;
. . .
signal (SIGINT, inthandler); . . .
int86(CNTRLC, ®s, ®s);
Notes
Segment registers are not included in inregs or outregs.
This call must be compiled with the -dos flag.
Page 2 (printed 8/7/87)
