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28 .\" @(#)setregid.2 8.2 (Berkeley) 4/16/94
36 .Nd set real and effective group ID
42 .Fn setregid "gid_t rgid" "gid_t egid"
44 The real and effective group ID's of the current process
45 are set to the arguments.
46 If the real group ID is changed, the saved group ID is changed to the
47 new value of the effective group ID.
49 Unprivileged users may change the real group
50 ID to the effective group ID and vice-versa; only the super-user may
53 Supplying a value of -1 for either the real or effective
54 group ID forces the system to substitute the current
55 ID in place of the -1 argument.
59 system call was intended to allow swapping
60 the real and effective group IDs
61 in set-group-ID programs to temporarily relinquish the set-group-ID value.
62 This system call did not work correctly,
63 and its purpose is now better served by the use of the
67 When setting the real and effective group IDs to the same value,
70 system call is preferred.
76 The current process is not the super-user and a change
77 other than changing the effective group-id to the real group-id
89 system call appeared in