bionic (3) setgid.3posix.gz

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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
       setgid — set-group-ID


SYNOPSIS
       #include <unistd.h>

       int setgid(gid_t gid);


DESCRIPTION
       If  the process has appropriate privileges, setgid() shall set the real group ID, effective group ID, and
       the saved set-group-ID of the calling process to gid.

       If the process does not have appropriate privileges, but gid is equal to the real group ID or  the  saved
       set-group-ID,  setgid() shall set the effective group ID to gid; the real group ID and saved set-group-ID
       shall remain unchanged.

       The setgid() function shall not affect the supplementary group list in any way.

       Any supplementary group IDs of the calling process shall remain unchanged.


RETURN VALUE
       Upon successful completion, 0 is returned. Otherwise, −1 shall be returned and errno set to indicate  the
       error.


ERRORS
       The setgid() 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(), setegid(), seteuid(), setregid(), setreuid(), setuid()

       The Base Definitions volume of POSIX.1‐2008, <sys_types.h>, <unistd.h>


       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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .