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- .Dd April 16, 1994
- .Dt SETREGID 2
- .Os
- .Sh NAME
- .Nm setregid
- .Nd set real and effective group ID
- .Sh LIBRARY
- .Lb libc
- .Sh SYNOPSIS
- .In unistd.h
- .Ft int
- .Fn setregid "gid_t rgid" "gid_t egid"
- .Sh 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.
- .Pp
- Unprivileged users may change the real group
- ID to the effective group ID and vice-versa; only the super-user may
- make other changes.
- .Pp
- 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.
- .Pp
- The
- .Fn 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
- .Xr setegid 2
- system call.
- .Pp
- When setting the real and effective group IDs to the same value,
- the standard
- .Fn setgid
- system call is preferred.
- .Sh RETURN VALUES
- .Rv -std setregid
- .Sh ERRORS
- .Bl -tag -width Er
- .It Bq Er 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.
- .El
- .Sh SEE ALSO
- .Xr getgid 2 ,
- .Xr issetugid 2 ,
- .Xr setegid 2 ,
- .Xr setgid 2 ,
- .Xr setuid 2
- .Sh HISTORY
- The
- .Fn setregid
- system call appeared in
- .Bx 4.2 .
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