hIsTerminalDevice returns True for /dev/null (aka NUL) on Windows

test 2228 is failing for me in an msys window on Windows:

-BlockBuffering Nothing
+LineBuffering
 BlockBuffering Nothing

because isatty behaves unexpectedly on mingw:

#include <stdio.h>
#include <unistd.h>

int main(void) {
    int i;
    i = fileno(stdin);
    printf("%d\n", i);
    i = fileno(stdout);
    printf("%d\n", i);
    i = isatty(0);
    printf("%d\n", i);
    i = isatty(1);
    printf("%d\n", i);
    return 0;
}

$ ./w            
0
1
0
0

$ ./w < /dev/null
0
1
64
0

Trac metadata

Trac field	Value
Version	6.8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/base
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture