setgid(3p) - phpMan

SETGID(P)                                                            SETGID(P)



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 imple-
              mentation.

       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
       IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information  Technology  --  Portable  Operating
       System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
       2001-2003 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 .



POSIX                                2003                            SETGID(P)

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