SETREGID(2) UNIX Programmer's Manual SETREGID(2) NAME setregid - set real and effective group ID SYNOPSIS #include _i_n_t setregid(rgid, egid) gid_t rgid, egid DESCRIPTION The real and effective group ID's of the current process are set to the arguments. 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 parameter. The setregid function 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 func- tion did not work correctly, and its purpose is now better served by the use of the setegid function (see setuid(2)). When setting the real and effective group IDs to the same value, the standard setgid function is preferred. RETURN VALUES Upon successful completion, a value of 0 is returned. Oth- erwise, a value of -1 is returned and _e_r_r_n_o 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), setegid(2), setgid(2), setuid(2) HISTORY The setregid function call appeared in 4.2BSD and was dropped in 4.4BSD. Printed 11/26/99 December 2, 1997 1