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...if (nzchar(rval) || !loop) break } rval } everything works fine up to .C("Rsockread", port, buffer = buffer, len = maxlen, PACKAGE = "base") when execution arrive to the c function call R goes in a some kind a eternal loop ! Thanks very much Massimo Salese -- View this message in context: http://r.789695.n4.nabble.com/read-socket-utils-package-somthing-is-going-wrong-tp4531374p4531374.html Sent from the R help mailing list archive at Nabble.com.