cvs commit: src/lib/libc_r/uthread uthread_close.c

[Ruslan Ermilov]

ru          2003/05/30 22:20:44 PDT

  FreeBSD src repository

  Modified files:
    lib/libc_r/uthread   uthread_close.c 
  Log:
  If an application closes one of its stdio descriptors (0..2),
  an excessive close() on one of these descriptors would cause
  a memory for this descriptor to be allocated in the internal
  descriptor table.  When this descriptor gets used again, e.g.
  through the call to open() or socket(), the descriptor would
  be erroneously left in the blocking mode, and the whole
  application would get stuck on a blocking operation, e.g.,
  in accept(2).
  
  Prevent this bug from happening by disallowing close() against
  non-active descriptors (return -1 and set errno to EBADF in
  this case).
  
  Reviewed by:    deischen
  Approved by:    re (scottl)
  
  Revision  Changes    Path
  1.14      +4 -2      src/lib/libc_r/uthread/uthread_close.c