setregid(3p) - phpMan

SETREGID(P)                                                        SETREGID(P)



NAME
       setregid - set real and effective group IDs

SYNOPSIS
       #include <unistd.h>

       int setregid(gid_t rgid, gid_t egid);


DESCRIPTION
       The  setregid()  function shall set the real and effective group IDs of the calling
       process.

       If rgid is -1, the real group ID shall not be changed; if egid is -1, the effective
       group ID shall not be changed.

       The real and effective group IDs may be set to different values in the same call.

       Only a process with appropriate privileges can set the real group ID and the effec-
       tive group ID to any valid value.

       A non-privileged process can set either the real group ID to the saved set-group-ID
       from  one  of  the exec family of functions, or the effective group ID to the saved
       set-group-ID or the real group ID.

       Any supplementary group IDs of the calling process remain unchanged.

RETURN VALUE
       Upon successful completion, 0 shall be returned. Otherwise, -1  shall  be  returned
       and errno set to indicate the error, and neither of the group IDs are changed.

ERRORS
       The setregid() function shall fail if:

       EINVAL The value of the rgid or egid argument is invalid or out-of-range.

       EPERM  The  process  does  not  have appropriate privileges and a change other than
              changing the real group ID to the saved set-group-ID, or changing the effec-
              tive group ID to the real group ID or the saved set-group-ID, was requested.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       If a set-group-ID process sets its effective group ID to its real group ID, it  can
       still set its effective group ID back to the saved set-group-ID.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exec() , getegid() , geteuid() , getgid() , getuid() , setegid() , seteuid() , set-
       gid()   ,   setreuid()   ,   setuid()   ,   the   Base   Definitions   volume    of
       IEEE Std 1003.1-2001, <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                          SETREGID(P)

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