NoErrorsTest.Mmap_WithMsync_MunmapBeforeClose
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0888482d8a
commit
597e126409
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@ -583,9 +583,10 @@ func (t *NoErrorsTest) Mmap_NoMsync_MunmapBeforeClose() {
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AssertEq(nil, err)
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AssertEq("taco", string(data))
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// Modify then unmap.
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// Modify the contents.
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data[0] = 'p'
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// Unmap.
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err = syscall.Munmap(data)
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AssertEq(nil, err)
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@ -650,7 +651,50 @@ func (t *NoErrorsTest) Mmap_NoMsync_CloseBeforeMunmap() {
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}
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func (t *NoErrorsTest) Mmap_WithMsync_MunmapBeforeClose() {
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AssertTrue(false, "TODO")
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var n int
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var err error
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// Open the file.
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t.f1, err = os.OpenFile(path.Join(t.Dir, "foo"), os.O_RDWR, 0)
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AssertEq(nil, err)
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// Write some contents to the file.
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n, err = t.f1.Write([]byte("taco"))
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AssertEq(nil, err)
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AssertEq(4, n)
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// mmap the file.
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data, err := syscall.Mmap(
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int(t.f1.Fd()), 0, 4,
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syscall.PROT_READ|syscall.PROT_WRITE,
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syscall.MAP_SHARED)
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AssertEq(nil, err)
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AssertEq("taco", string(data))
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// Modify the contents.
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data[0] = 'p'
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// msync. This causes a write, but not a flush.
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ExpectThat(t.getFlushes(), ElementsAre())
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ExpectThat(t.getFsyncs(), ElementsAre())
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// Unmap. Again, this does not cause a flush.
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err = syscall.Munmap(data)
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AssertEq(nil, err)
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ExpectThat(t.getFlushes(), ElementsAre())
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ExpectThat(t.getFsyncs(), ElementsAre())
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// Close the file. We should now see a flush with the modified contents, even
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// on OS X, which works differently from Linux with regard to flushing dirty
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// pages (cf. https://github.com/osxfuse/osxfuse/issues/202).
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err = t.f1.Close()
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t.f1 = nil
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AssertEq(nil, err)
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ExpectThat(t.getFlushes(), ElementsAre("paco"))
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ExpectThat(t.getFsyncs(), ElementsAre())
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}
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func (t *NoErrorsTest) Mmap_WithMsync_CloseBeforeMunmap() {
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