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SETEGID(3P)                POSIX Programmer's Manual               SETEGID(3P)
PROLOG
       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.
NAME
       setegid -- set the effective group ID
SYNOPSIS
       #include <unistd.h>
       int setegid(gid_t gid);
DESCRIPTION
       If gid is equal to the real group ID or the saved set-group-ID,  or  if
       the  process has appropriate privileges, setegid() shall set the effec-
       tive group ID of the calling process to gid; the real group  ID,  saved
       set-group-ID, and any supplementary group IDs shall remain unchanged.
       The setegid() function shall not affect the supplementary group list in
       any way.
RETURN VALUE
       Upon successful completion, 0 shall be returned; otherwise, -1 shall be
       returned and errno set to indicate the error.
ERRORS
       The setegid() function shall fail if:
       EINVAL The value of the gid argument is invalid and is not supported by
              the implementation.
       EPERM  The process does not have appropriate privileges  and  gid  does
              not match the real group ID or the saved set-group-ID.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       Refer to the RATIONALE section in setuid().
FUTURE DIRECTIONS
       None.
SEE ALSO
       exec,  getegid(),  geteuid(),  getgid(), getuid(), seteuid(), setgid(),
       setregid(), setreuid(), setuid()
       The Base Definitions volume of POSIX.1-2008, <sys_types.h>, <unistd.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          SETEGID(3P)