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Source position: linux.pp line 474
function setreuid(  | 
ruid: uid_t;  | 
euid: uid_t  | 
):cint;  | 
setreuid sets the real user ID to ruid and the effective user ID to euid. Passing a value of -1 tells the system not to change that value.
On Error, -1 is returned. fpgeterrno can be used to get more detailed error information.
  | 
Set Real and Effective Group ID  |