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Manual Reference Pages  - TTYNAME (3)

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ttyname, ttyname_r - return name of a terminal

CONTENTS

Synopsis
Description
Errors

#include <unistd.h> 



char *ttyname(int fd); 




int ttyname_r(int fd, char *buf, size_t buflen); 

The function ttyname() returns a pointer to the NUL-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 ttyname_r():

EBADF	Bad file descriptor.
ENOTTY	File descriptor does not refer to a terminal device.
ERANGE	buflen was too small to allow storing the pathname.

POSIX.1

fstat(2), isatty(3)

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