This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       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                                        GETGID(3POSIX)

       The getgid() function shall return the real group ID of the calling process.  The getgid() function shall
       not modify errno.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

       getgid — get the real group ID

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

       In  a conforming environment, getgid() 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 (gid_t)-1 and set errno to indicate such an
       environment; doing so does not violate this standard, since such an environment is already an extension.

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

getegid(), geteuid(), getuid(), setegid(), seteuid(), setgid(), setregid(), setreuid(), setuid()

       The Base Definitions volume of POSIX.1‐2017, <sys_types.h>, <unistd.h>

       #include <unistd.h>

       gid_t getgid(void);