centos man page for grantpt

GRANTPT(3P)						     POSIX Programmer's Manual						       GRANTPT(3P)

PROLOG
       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
       grantpt - grant access to the slave pseudo-terminal device

SYNOPSIS
       #include <stdlib.h>

       int grantpt(int fildes);

DESCRIPTION
       The grantpt() function shall change the mode and ownership of the slave pseudo-terminal device associated with its  master  pseudo-terminal
       counterpart. The fildes argument is a file descriptor that refers to a master pseudo-terminal device. The user ID of the slave shall be set
       to the real UID of the calling process and the group ID shall be set to an unspecified group ID.  The permission mode of the slave  pseudo-
       terminal shall be set to readable and writable by the owner, and writable by the group.

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

RETURN VALUE
       Upon successful completion, grantpt() shall return 0; otherwise, it shall return -1 and set errno to indicate the error.

ERRORS
       The grantpt() function may fail if:

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

       EINVAL The fildes argument is not associated with a master pseudo-terminal device.

       EACCES The corresponding slave pseudo-terminal device could not be accessed.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       open(), ptsname(), unlockpt(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							       GRANTPT(3P)