tcgetattr(0, &T) fails on redirection

Tue Nov 2 11:49:00 GMT 1999

The following code:
#include <sys/termios.h>
main()
{
 struct termios T;
 if (tcgetattr(0, &T) == 0)
 printf("Succeeded\n");
 else
 printf("Failed\n");
}
works when I simply execute
./program
but fails when I run
./program < file
Is the standard input file descriptor not 0 in this case ?
If so, how do I find out what it is ?
Or perhaps one can't run tcgetattr on this file descriptor ?
If its impossible, how does one put standard input into
raw mode in this case ?
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