@node _doserrno, dos
@subheading Syntax
 
@example
#include <errno.h>
 
extern int _doserrno;
@end example
 
@subheading Description

Whenever a DOS call returns a failure indication, this variable is
assigned the value of the error code returned by the failed DOS call.

For a list of the error codes and their short descriptions, see
@ref{dosexterr}.

@subheading Portability

@portability !ansi, !posix

@subheading Example

@example
 _doserrno = 0;
 fprintf (stdprn, "Hello, world!\r\n\f");
 if (_doserrno == 0x1c)
   fprintf (stderr, "The printer is out of paper!\n");
@end example