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



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

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

SSYYNNOOPPSSIISS
       #include <stdlib.h>

       int grantpt(int _f_i_l_d_e_s);

DDEESSCCRRIIPPTTIIOONN
       The _g_r_a_n_t_p_t() function shall change the mode and ownership of the slave
       pseudo-terminal device associated with its master pseudo-terminal
       counterpart. The _f_i_l_d_e_s 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 _g_r_a_n_t_p_t() function is unspecified if the
       application has installed a signal handler to catch SIGCHLD signals.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, _g_r_a_n_t_p_t() shall return 0; otherwise, it
       shall return -1 and set _e_r_r_n_o to indicate the error.

EERRRROORRSS
       The _g_r_a_n_t_p_t() function may fail if:

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

       EEBBAADDFF  The _f_i_l_d_e_s argument is not a valid open file descriptor.

       EEIINNVVAALL The _f_i_l_d_e_s argument is not associated with a master pseudo-
              terminal device.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       See the RATIONALE section for _p_o_s_i_x___o_p_e_n_p_t().

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _o_p_e_n(), _p_o_s_i_x___o_p_e_n_p_t(), _p_t_s_n_a_m_e(), _u_n_l_o_c_k_p_t()

       The Base Definitions volume of POSIX.1-2017, <<ssttddlliibb..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                           GRANTPT(3)
