osf1 man page for setrgid

setrgid(3)						     Library Functions Manual							setrgid(3)

NAME
       setrgid, setegid - Set the process's group IDs

LIBRARY
       Standard C Library (libc.a)

SYNOPSIS
       #include <sys/types.h>
       int setrgid(	 gid_t rgid);
       int setegid (	  gid_t egid);

PARAMETERS
       Specifies the value of the real group ID to be set.  Specifies the value of the effective group ID to be set.

DESCRIPTION
       The  setegid() function sets the process's effective group ID to the value of the egid parameter if the egid parameter is equal to the cur-
       rent real, effective, or saved group ID.

       The setrgid() function sets the process's real group ID to the value of the rgid parameter.

       Only the superuser may change the real or effective group ID to a value other than the current real or saved group ID of the process.

RETURN VALUES
       Upon successful completion, the setegid() and setrgid() functions return a value of 0 (zero).  If either function fails, a value of  -1	is
       returned and errno is set to indicate the error.

ERRORS
       If  the	setrgid()  or  setegid()  function  fails, errno is set to one of the following values: The rgid or egid parameter is not equal to
       either the real or saved group IDs of the process and the calling process does not have superuser privilege.

RELATED INFORMATION
       Functions: getgroups(2), setgroups(2), setregid(2).

       Commands: groups(1).  delim off

																	setrgid(3)