int setregid(rgid, egid) int rgid, egid;
setregid() is used to set the real and effective group IDs of the calling process. If rgid is -1, the real GID is not changed; if egid is -1, the effective GID is not changed. The real and effective GIDs may be set to different values in the same call.
If the effective user ID of the calling process is super-user, the real GID and the effective GID can be set to any legal value.
If the effective user ID of the calling process is not super-user, either the real GID can be set to the saved setGID from execve.2v or the effective GID can either be set to the saved setGID or the real GID. Note: if a setGID process sets its effective GID to its real GID, it can still set its effective GID back to the saved setGID.
In either case, if the real GID is being changed (that is, if rgid is not -1), or the effective GID is being changed to a value not equal to the real GID, the saved setGID is set equal to the new effective GID.
setregid() returns:
setregid() will fail and neither of the group IDs will be changed if:
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