NAME

       ptsname, ptsname_r - get the name of the slave pseudoterminal

SYNOPSIS

       #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include <stdlib.h>

       char *ptsname(int fd);

       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <stdlib.h>

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

DESCRIPTION

       The  ptsname()  function  returns the name of the slave pseudoterminal device corresponding to the master
       referred to by fd.

       The ptsname_r() function is the reentrant equivalent of ptsname().  It returns  the  name  of  the  slave
       pseudoterminal  device  as a null-terminated string in the buffer pointed to by buf.  The buflen argument
       specifies the number of bytes available in buf.

RETURN VALUE

       On success, 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, NULL is returned.

       On  success, ptsname_r() returns 0.  On failure, a nonzero 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 pseudoterminal master device.

       ERANGE (ptsname_r() only) buf is too small.

VERSIONS

       ptsname() is provided in glibc since version 2.1.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌────────────┬───────────────┬────────────────────────┐
       │Interface   │ Attribute     │ Value                  │
       ├────────────┼───────────────┼────────────────────────┤
       │ptsname()   │ Thread safety │ MT-Unsafe race:ptsname │
       ├────────────┼───────────────┼────────────────────────┤
       │ptsname_r() │ Thread safety │ MT-Safe                │
       └────────────┴───────────────┴────────────────────────┘

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

       ptsname() is part of the UNIX 98 pseudoterminal support (see pts(4)).

       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

       grantpt(3), posix_openpt(3), ttyname(3), unlockpt(3), pts(4), pty(7)

COLOPHON

       This page is part of release 4.04 of  the  Linux  man-pages  project.   A  description  of  the  project,
       information   about   reporting   bugs,   and   the  latest  version  of  this  page,  can  be  found  at
       http://www.kernel.org/doc/man-pages/.

                                                   2015-08-08                                         PTSNAME(3)