GETEUID(3)                 POSIX Programmer's Manual                GETEUID(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
       geteuid -- get the effective user ID

SSYYNNOOPPSSIISS
       #include <unistd.h>

       uid_t geteuid(void);

DDEESSCCRRIIPPTTIIOONN
       The _g_e_t_e_u_i_d() function shall return the effective user ID of the
       calling process.  The _g_e_t_e_u_i_d() function shall not modify _e_r_r_n_o.

RREETTUURRNN VVAALLUUEE
       The _g_e_t_e_u_i_d() function shall always be successful and no return value
       is reserved to indicate an error.

EERRRROORRSS
       No errors are defined.

       _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
       In a conforming environment, _g_e_t_e_u_i_d() will always succeed. It is
       possible for implementations to provide an extension where a process in
       a non-conforming environment will not be associated with a user or
       group ID. It is recommended that such implementations return (uuiidd__tt)-1
       and set _e_r_r_n_o to indicate such an environment; doing so does not
       violate this standard, since such an environment is already an
       extension.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _g_e_t_e_g_i_d(), _g_e_t_g_i_d(), _g_e_t_u_i_d(), _s_e_t_e_g_i_d(), _s_e_t_e_u_i_d(), _s_e_t_g_i_d(),
       _s_e_t_r_e_g_i_d(), _s_e_t_r_e_u_i_d(), _s_e_t_u_i_d()

       The Base Definitions volume of POSIX.1-2017, <<ssyyss__ttyyppeess..hh>>, <<uunniissttdd..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                           GETEUID(3)
