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    SubjectRe: Quick close of all the open files.
    Date writes:

    > On Wed, 07 Jun 2006 03:15:43 +0530, vamsi krishna said:
    >> Hello,
    >> I found that the following code is closing all the open files by the
    >> program, do you think its a bug in kernel code?
    >> ------------
    >> fp = tmpfile();
    >> fp->_chain = stderr;
    >> fpclose(fp);
    >> fp = NULL;
    > strace that, and see how many times close() gets called. If it gets
    > called once, it's a kernel bug. If it gets called once for each open
    > file, it's a userspace bug.

    Actually, it's not a bug at all.

    > For bonus points, how did you verify that all the open files were closed?
    > (Hint - what does that fp->_chain = stderr *really* do? ;)

    As it touches the innards of the FILE type, it invokes undefined
    behavior. Nothing that follows can be considered a bug.

    Måns Rullgård

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      Last update: 2006-06-07 00:06    [W:0.052 / U:1.600 seconds]
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