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Aucbvax.4629 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Fri Oct 23 19:45:18 1981 stdio(fdopen) >From dsp.dove@MIT-SPEECH@MIT-AI Fri Oct 23 17:06:30 1981 I just tripped over a "feature" of the stdio package. I was setting up a cu.c with buffering and trying to get it to recover after an interrupt while it was sending a file. It turns out that once IOERR is set in the _iob associated with the stream it must be closed to clear the error and allow further output (yuk). It had been opened by using fdopen on a previously opened fd for output, so I had it call fclose and fdopen again. Well, that didn't work because fdopen just associates the stream with the fd without dup'ing the fd, so the close closed the fd and the subsequent fdopen referred to a now invalid fd (which it didn't test for validity)! Wonderful!!! -------

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