isatty

Remonter à Io.h - Index

Header File

io.h

Category

Input/output Routines

Prototype

int isatty(int handle);

Description

Checks for device type.

isatty determines whether handle is associated with any one of the following character devices:

• a terminal
• a console
• a printer
• a serial port

Return Value

If the device is one of the four character devices listed above, isatty returns a nonzero integer. If it is not such a device, isatty returns 0.

Example

 #include <stdio.h>
 #include <io.h>
 int main(void)
 {
     int handle;
     handle = fileno(stdout);
     if (isatty(handle))
        printf("Handle %d is a device type\n", handle);
     else
        printf("Handle %d isn't a device type\n", handle);
     return 0;
 }

Portability

POSIX	Win32	ANSI C	ANSI C++
+	+