cvs commit: src/sys/fs/fifofs fifo_vnops.c

[Robert Watson]

rwatson     2005-09-12 10:16:18 UTC

  FreeBSD src repository

  Modified files:
    sys/fs/fifofs        fifo_vnops.c 
  Log:
  Only poll the fifo for read events if the fifo is attached to a readable
  file descriptor.  Otherwise, the read end of a fifo might return that it
  is writable (which it isn't).
  
  Only poll the fifo for write events if the fifo attached to a writable
  file descriptor.  Otherwise, the write end of a fifo might return that
  it is readable (which it isn't).
  
  In the event that a file is FREAD|FWRITE (which is allowed by POSIX, but
  has undefined behavior), we poll for both.
  
  MFC after:      3 days
  
  Revision  Changes    Path
  1.118     +2 -2      src/sys/fs/fifofs/fifo_vnops.c