int _isatty( int handle );
| Routine | Required Header | Compatibility |
| _isatty | <io.h> | Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
_isatty returns a nonzero value handle is associated with a character device. Otherwise, _isatty returns 0.
Parameter
handle
Handle referring to device to be tested
Remarks
The _isatty function determines whether handle is associated with a character device (a terminal, console, printer, or serial port).
Example
/* 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");
}
Output
stdout has been redirected to a file