Other Alias
ttyname_rSYNOPSIS
#include <unistd.h>
char *ttyname(int fildes);
int ttyname_r(int fildes, char *name, size_t
namesize);
DESCRIPTION
The ttyname() function shall return a pointer to a string containing a null-terminated pathname of the terminal associated with file descriptor fildes. The return value may point to static data whose content is overwritten by each call.
The ttyname() function need not be reentrant. A function that is not required to be reentrant is not required to be thread-safe.
The ttyname_r() function shall store the null-terminated pathname of the terminal associated with the file descriptor fildes in the character array referenced by name. The array is namesize characters long and should have space for the name and the terminating null character. The maximum length of the terminal name shall be {TTY_NAME_MAX}.
RETURN VALUE
Upon successful completion, ttyname() shall return a pointer to a string. Otherwise, a null pointer shall be returned and errno set to indicate the error.
If successful, the ttyname_r() function shall return zero. Otherwise, an error number shall be returned to indicate the error.
ERRORS
The ttyname() function may fail if:
- EBADF
- The fildes argument is not a valid file descriptor.
- ENOTTY
-
The fildes argument does not refer to a terminal.
The ttyname_r() function may fail if:
- EBADF
- The fildes argument is not a valid file descriptor.
- ENOTTY
- The fildes argument does not refer to a terminal.
- ERANGE
-
The value of namesize is smaller than the length of the string
to be returned including the terminating null character.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
The term ``terminal'' is used instead of the historical term ``terminal device'' in order to avoid a reference to an undefined term.
The thread-safe version places the terminal name in a user-supplied buffer and returns a non-zero value if it fails. The non-thread-safe version may return the name in a static data area that may be overwritten by each call.
FUTURE DIRECTIONS
None.
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .