Name
ttyname, ttyname_r - return name of a terminalLibrary
Standard C library ( libc ", " -lc )Synopsis
#include <unistd.h> char *ttyname(int fd );
int ttyname_r(int " fd ", char " buf [. buflen "], size_t buflen );
Description
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 lengthbuflen
. Return Value
The function ttyname() returns a pointer to a pathname on success. On error, NULL is returned, and errno is set to indicate the error. The function ttyname_r() returns 0 on success, and an error number upon error.Errors
EBADF Bad file descriptor.
ENODEV fd refers to a slave pseudoterminal device but the corresponding pathname could not be found (see NOTES).
ENOTTY fd does not refer to a terminal device.
ERANGE ( ttyname_r ()) buflen was too small to allow storing the pathname.
Attributes
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
T} | Thread safety | MT-Unsafe race:ttyname |
T} | Thread safety | MT-Safe |