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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, a NULL pointer is returned.

       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.


       ptsname() is part of the UNIX 98 pseudoterminal support  (see  pts(4)).
       This function is specified in POSIX.1-2001.

       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 3.35 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at

                                  2008-09-03                        PTSNAME(3)