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From: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 9 Dec 2010 20:28:30 +0000 (UTC)
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Subject: cvs commit: src/lib/libc/stdio freopen.c
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jhb         2010-12-09 20:28:30 UTC

  FreeBSD src repository

  Modified files:
    lib/libc/stdio       freopen.c 
  Log:
  SVN rev 216334 on 2010-12-09 20:28:30Z by jhb
  
  When reopening a stream backed by an open file descriptor, do not close
  the existing file descriptor.  Instead, let dup2() atomically close the
  old file descriptor when assigning the newly opened file to the same
  descriptor.  This closes a race in a multithreaded application where a
  concurrent open() could allocate the existing file descriptor in between
  the calls to close() and dup2().
  
  PR:             threads/79887
  Submitted by:   Dmitrij Tejblum  tejblum of yandex-team.ru
  Reviewed by:    davidxu
  MFC after:      1 week
  
  Revision  Changes    Path
  1.22      +9 -12     src/lib/libc/stdio/freopen.c