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isatty

Synopsis:
          int isatty(int fd);
     

Request:
`Fisatty,fd'
Return value:
Returns 1 if fd refers to the gdb console, 0 otherwise.
Errors:
EINTR
The call was interrupted by the user.

Note that the isatty call is treated as a special case: it returns 1 to the target if the file descriptor is attached to the gdb console, 0 otherwise. Implementing through system calls would require implementing ioctl and would be more complex than needed.