GETSID(3)                  POSIX Programmer's Manual                 GETSID(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
       getsid -- get the process group ID of a session leader

SSYYNNOOPPSSIISS
       #include <unistd.h>

       pid_t getsid(pid_t _p_i_d);

DDEESSCCRRIIPPTTIIOONN
       The _g_e_t_s_i_d() function shall obtain the process group ID of the process
       that is the session leader of the process specified by _p_i_d.  If _p_i_d is
       (ppiidd__tt)0, it specifies the calling process.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, _g_e_t_s_i_d() shall return the process group ID
       of the session leader of the specified process. Otherwise, it shall
       return -1 and set _e_r_r_n_o to indicate the error.

EERRRROORRSS
       The _g_e_t_s_i_d() function shall fail if:

       EEPPEERRMM  The process specified by _p_i_d is not in the same session as the
              calling process, and the implementation does not allow access to
              the process group ID of the session leader of that process from
              the calling process.

       EESSRRCCHH  There is no process with a process ID equal to _p_i_d.

       _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
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _e_x_e_c, _f_o_r_k(), _g_e_t_p_i_d(), _g_e_t_p_g_i_d(), _s_e_t_p_g_i_d(), _s_e_t_s_i_d()

       The Base Definitions volume of POSIX.1-2017, <<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                            GETSID(3)
