NAME
ptsname, ptsname_r - get the name of the slave pseudo-terminal
SYNOPSIS
#define _XOPEN_SOURCE
#include <stdlib.h>
I char *ptsname(int fd );
#define _GNU_SOURCE
#include <stdlib.h>
I char *ptsname_r(int fd , char * buf , size_t buflen );
DESCRIPTION
The
R ptsname ()
function returns the name of the slave pseudo-terminal (pty) device
corresponding to the master referred to by
R fd .
The
R ptsname_r ()
function is the reentrant equivalent of
R ptsname ().
It returns the name of the slave pseudo-terminal device as a
null-terminated string in the buffer pointed to by
R buf .
The
buflen
argument specifies the number of bytes available in
R buf .
RETURN VALUE
On success,
R ptsname ()
returns a pointer to a string in static storage which will be
overwritten by subsequent calls.
This pointer must not be freed.
On failure, a NULL pointer is returned.
On success,
R ptsname_r ()
returns 0.
On failure, a non-zero value is returned
and
errno
is set to indicate the error.
ERRORS
EINVAL
(ptsname_r()
only)
buf
is NULL.
ENOTTY
fd
does not refer to a pseudo-terminal master device.
ERANGE
(ptsname_r()
only)
buf
is too small.
CONFORMING TO
R ptsname ()
is part of the Unix98 pseudo-terminal support (see
pts(4)).
This function is specified in POSIX.1-2001.
R ptsname_r ()
is a Linux extension.
A version of this function is documented on Tru64 and HP-UX, but
on those implementations, -1 is returned on error, with
errno
set to indicate the error.
Avoid using this function in portable programs.
SEE ALSO
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