| /* | |
| * isatty.c | |
| */ | |
| #include <unistd.h> | |
| #include <termios.h> | |
| #include <errno.h> | |
| int isatty(int fd) | |
| { | |
| int old_errno = errno; | |
| int istty; | |
| pid_t dummy; | |
| /* All ttys support TIOCGPGRP */ | |
| istty = !ioctl(fd, TIOCGPGRP, &dummy); | |
| errno = old_errno; | |
| return istty; | |
| } |