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ttyname, ttyname_r - return name of a terminal
char *ttyname(int fd);
int ttyname_r(int fd, char *buf, size_t buflen);
The function ttyname() returns a pointer to the null-terminated
pathname of the terminal device that is open on the file descriptor fd,
or NULL on error (for example, if fd is not connected to a terminal).
The return value may point to static data, possibly overwritten by the
next call. The function ttyname_r() stores this pathname in the buffer
buf of length buflen.
The function ttyname() returns a pointer to a pathname on success. On
error, NULL is returned, and errno is set appropriately. The function
ttyname_r() returns 0 on success, and an error number upon error.
Values stored in errno by a failing ttyname() or returned by a failing
EBADF Bad file descriptor.
ENOTTY File descriptor does not refer to a terminal device.
ERANGE buflen was too small to allow storing the pathname.
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