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       ptsname, ptsname_r - get the name of the slave pseudoterminal


       #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);


       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.


       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

       On success, ptsname_r() returns 0.  On failure, a nonzero value is returned and  errno  is
       set to indicate the error.


       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.


       ptsname() is provided in glibc since version 2.1.


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

       │InterfaceAttributeValue                  │
       │ptsname()   │ Thread safety │ MT-Unsafe race:ptsname │
       │ptsname_r() │ Thread safety │ MT-Safe                │


       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.


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


       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

                                            2015-08-08                                 PTSNAME(3)