grantpt man page on CentOS

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GRANTPT(3)		   Linux Programmer's Manual		    GRANTPT(3)

NAME
       grantpt - grant access to the slave pseudo-terminal

SYNOPSIS
       #define _XOPEN_SOURCE
       #include <stdlib.h>

       int grantpt(int fd);

DESCRIPTION
       The  grantpt() function changes the mode and owner of the slave pseudo-
       terminal device (pty) corresponding to the master pty  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 pty 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 pty.

CONFORMING TO
       POSIX.1-2001

NOTES
       This  is	 part  of  the	Unix98	pty 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)

PTY Control			  2003-01-30			    GRANTPT(3)
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