setregid(2) [freebsd man page]

SETREGID(2)						      BSD System Calls Manual						       SETREGID(2)

NAME

     setregid -- set real and effective group ID

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     setregid(gid_t rgid, gid_t egid);

DESCRIPTION

     The real and effective group ID's of the current process are set to the arguments.  If the real group ID is changed, the saved group ID is
     changed to the new value of the effective group ID.

     Unprivileged users may change the real group ID to the effective group ID and vice-versa; only the super-user may make other changes.

     Supplying a value of -1 for either the real or effective group ID forces the system to substitute the current ID in place of the -1 argument.

     The setregid() system call was intended to allow swapping the real and effective group IDs in set-group-ID programs to temporarily relinquish
     the set-group-ID value.  This system call did not work correctly, and its purpose is now better served by the use of the setegid(2) system
     call.

     When setting the real and effective group IDs to the same value, the standard setgid() system call is preferred.

RETURN VALUES

     The setregid() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
     cate the error.

ERRORS

     [EPERM]		The current process is not the super-user and a change other than changing the effective group-id to the real group-id was
			specified.

SEE ALSO

     getgid(2), issetugid(2), setegid(2), setgid(2), setuid(2)

HISTORY

     The setregid() system call appeared in 4.2BSD.

BSD
								  April 16, 1994							       BSD

setregid(2)							   System Calls 						       setregid(2)

NAME

       setregid - set real and effective group IDs

SYNOPSIS

       #include <unistd.h>

       int setregid(gid_t rgid, gid_t egid);

DESCRIPTION

       The  setregid()	function  is used to set the real and effective group IDs of the calling process.  If rgid is -1, the real group ID is not
       changed; if egid is -1, the effective group ID is not changed.  The real and effective group IDs may be set to different values in the same
       call.

       If  the	{PRIV_PROC_SETID}  privilege is asserted in the effective set of the calling process, the real group ID and the effective group ID
       can be set to any legal value.

       If the {PRIV_PROC_SETID} privilege is not asserted in the effective set of the calling process, either the real group ID can be set to  the
       saved set-group-ID from execve(2), or the effective group ID can either be set to the saved set-group-ID or the real group ID.

       In  either  case, if the real group ID is being changed (that is, if rgid is not -1), or the effective group ID is being changed to a value
       not equal to the real group ID, the saved set-group-ID is set equal to the new effective group ID.

RETURN VALUES

       Upon successful completion, 0 is returned. Otherwise, -1 is returned, errno is set to indicate the error, and neither of the group IDs will
       be changed.

ERRORS

       The setregid() function will fail if:

       EINVAL	 The value of rgid or egid is less than 0 or greater than UID_MAX (defined in <limits.h>).

       EPERM	 The  {PRIV_PROC_SETID}  privilege  is not asserted in the effective set of the calling processes and a change was specified other
		 than changing the real group ID to the saved set-group-ID or changing the effective group ID to the real group ID  or	the  saved
		 group ID.

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.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       execve(2), getgid(2), setreuid(2), setuid(2), attributes(5), privileges(5), standards(5)

SunOS 5.11							    22 Mar 2004 						       setregid(2)