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Theorem open

posix_open#(PATH, MODE, USER, ROOT, FS; FD, ERR, OFH) {choose E with pre-open(PATH, MODE, E, USER, ROOT, FS, OFH) in ERR := E; if ERR = ESUCCESS then let FID = ROOT[PATH].fid in choose N with ¬ N ∈ OFH in {OFH[N] := mkfh(FID, MODE, 0); FD := N} }