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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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TTYNAME(3P) POSIX Programmer's Manual TTYNAME(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
ttyname, ttyname_r — find the pathname of a terminal
#include <unistd.h>
char *ttyname(int fildes);
int ttyname_r(int fildes, char *name, size_t namesize);
The ttyname() function shall return a pointer to a string
containing a null-terminated pathname of the terminal associated
with file descriptor fildes. The application shall not modify
the string returned. The returned pointer might be invalidated or
the string content might be overwritten by a subsequent call to
ttyname(). The returned pointer and the string content might
also be invalidated if the calling thread is terminated.
The ttyname() function need not 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}.
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.
The ttyname() function may fail if:
EBADF The fildes argument is not a valid file descriptor.
ENOTTY The file associated with the fildes argument is not a
terminal.
The ttyname_r() function may fail if:
EBADF The fildes argument is not a valid file descriptor.
ENOTTY The file associated with the fildes argument is not 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.
None.
None.
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.
None.
The Base Definitions volume of POSIX.1‐2017, unistd.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 TTYNAME(3P)
Pages that refer to this page: unistd.h(0p), tty(1p), ctermid(3p), ptsname(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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