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NAME
       grantpt - grant access to the slave pseudoterminal


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

       int grantpt(int fd);


DESCRIPTION
       The  grantpt()  function  changes  the  mode  and  owner  of  the slave
       pseudoterminal  device  corresponding  to  the  master   pseudoterminal
       referred  to by fd.  The user ID of the slave is set to the real UID of
       the calling process.  The group ID  is  set  to  an  unspecified  value
       (e.g., tty).  The mode of the slave is set to 0620 (crw--w----).

       The  behavior  of  grantpt()  is  unspecified  if  a  signal handler is
       installed to catch SIGCHLD signals.


RETURN VALUE
       When successful, grantpt() returns 0.  Otherwise,  it  returns  -1  and
       sets errno appropriately.


ERRORS
       EACCES The corresponding slave pseudoterminal could not be accessed.

       EBADF  The fd argument is not a valid open file descriptor.

       EINVAL The  fd  argument  is  valid  but  not  associated with a master
              pseudoterminal.


VERSIONS
       grantpt() is provided in glibc since version 2.1.


CONFORMING TO
       POSIX.1-2001.


NOTES
       This is part of the UNIX 98 pseudoterminal support, see  pts(4).   Many
       systems  implement this function via a set-user-ID helper binary called
       "pt_chown".  With Linux devpts no such helper binary is required.


SEE ALSO
       open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)


COLOPHON
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