grantpt man page on ElementaryOS

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

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 pseu‐
       doterminal device corresponding to the master  pseudoterminal  referred
       to by fd.  The user ID of the slave is set to the real UID of the call‐
       ing 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 pseu‐
	      doterminal.

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
       This page is part of release 3.54 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2008-06-14			    GRANTPT(3)
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