Checks for a character device.
| #include <io.h> | Required only for function declarations |
int _isatty( int handle );
| handle | Handle referring to device to be tested |
The _isatty function determines whether handle is associated with a character device (a terminal, console, printer, or serial port).
The _isatty function returns a nonzero value if the device is a character device. Otherwise, the return value is 0.
Standards:UNIX
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:DOS32X
Use _isatty for compatibility with ANSI naming conventions of non-ANSI functions. Use isatty and link with OLDNAMES.LIB for UNIX compatibility.
/* ISATTY.C: This program checks to see whether stdout has been
* redirected to a file.
*/
#include <stdio.h>
#include <io.h>
void main( void )
{
if( _isatty( _fileno( stdout ) ) )
printf( "stdout has not been redirected to a file\n" );
else
printf( "stdout has been redirected to a file\n");
}
stdout has not been redirected to a file