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From: Bruce Evans <bde@FreeBSD.ORG>
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Date: Sat, 13 Dec 1997 05:50:01 -0800 (PST)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-sys@FreeBSD.ORG
Subject: cvs commit: src/sys/miscfs/fifofs fifo_vnops.c
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bde         1997/12/13 05:50:01 PST

  Modified files:
    sys/miscfs/fifofs    fifo_vnops.c 
  Log:
  Fixed EOF handing.
  
  1. SS_CANTRCVMORE was initially set on the wrong socket, so reads
  when there has never been a writer on the socket did not return 0.
  Note that such reads are only possible if the fifo was opened in
  (O_RDONLY | O_NONBLOCK) mode.
  
  2. SS_CANTSENDMORE was initially set on the wrong socket, but this
  was harmless because the wrong socket is never sent from and there
  is no need to set the flag initially on the right socket (since open
  in (O_WRONLY | O_NONBLOCK) mode fails if there is no reader...).
  
  3. SS_CANTRCVMORE was cleared when read() returns.  This broke the
  case where read() returns 0 - subsequent reads are supposed to
  return 0 until a writer appears.  There is no need to clear the
  flag when read() returns, since it is cleared correctly when a
  writer appears.
  
  Revision  Changes    Path
  1.40      +2 -8      src/sys/miscfs/fifofs/fifo_vnops.c