Beispiel #1
0
func (s *S) TestIsResidentTwoPages(c *C) {
	testPath := path.Join(c.MkDir(), "test.txt")
	file, err := os.Create(testPath)
	c.Assert(err, IsNil)
	defer file.Close()

	file.Seek(int64(os.Getpagesize()*2-1), 0)
	file.Write([]byte{'x'})

	mmap, err := gommap.Map(file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_PRIVATE)
	c.Assert(err, IsNil)
	defer mmap.UnsafeUnmap()

	// Not entirely a stable test, but should usually work.

	mmap[len(mmap)-1] = 'x'

	mapped, err := mmap.IsResident()
	c.Assert(err, IsNil)
	c.Assert(mapped, DeepEquals, []bool{false, true})

	mmap[0] = 'x'

	mapped, err = mmap.IsResident()
	c.Assert(err, IsNil)
	c.Assert(mapped, DeepEquals, []bool{true, true})
}
Beispiel #2
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func (s *S) TestIsResidentUnderOnePage(c *C) {
	mmap, err := gommap.Map(s.file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_PRIVATE)
	c.Assert(err, IsNil)
	defer mmap.UnsafeUnmap()

	mapped, err := mmap.IsResident()
	c.Assert(err, IsNil)
	c.Assert(mapped, DeepEquals, []bool{true})
}
Beispiel #3
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func (s *S) TestProtFlagsAndErr(c *C) {
	testPath := s.file.Name()
	s.file.Close()
	file, err := os.Open(testPath)
	c.Assert(err, IsNil)
	s.file = file
	_, err = gommap.Map(s.file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_SHARED)
	// For this to happen, both the error and the protection flag must work.
	c.Assert(err, Equals, syscall.EACCES)
}
Beispiel #4
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func (s *S) TestAdvise(c *C) {
	mmap, err := gommap.Map(s.file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_PRIVATE)
	c.Assert(err, IsNil)
	defer mmap.UnsafeUnmap()

	// A bit tricky to blackbox-test these.
	err = mmap.Advise(gommap.MADV_RANDOM)
	c.Assert(err, IsNil)

	err = mmap.Advise(9999)
	c.Assert(err, ErrorMatches, "invalid argument")
}
Beispiel #5
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func (s *S) TestProtect(c *C) {
	mmap, err := gommap.Map(s.file.Fd(), gommap.PROT_READ, gommap.MAP_SHARED)
	c.Assert(err, IsNil)
	defer mmap.UnsafeUnmap()
	c.Assert([]byte(mmap), DeepEquals, testData)

	err = mmap.Protect(gommap.PROT_READ | gommap.PROT_WRITE)
	c.Assert(err, IsNil)

	// If this operation doesn't blow up tests, the call above worked.
	mmap[9] = 'X'
}
Beispiel #6
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func (s *S) TestFlags(c *C) {
	mmap, err := gommap.Map(s.file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_PRIVATE)
	c.Assert(err, IsNil)
	defer mmap.UnsafeUnmap()

	mmap[9] = 'X'
	mmap.Sync(gommap.MS_SYNC)

	fileData, err := ioutil.ReadFile(s.file.Name())
	c.Assert(err, IsNil)
	// Shouldn't have written, since the map is private.
	c.Assert(fileData, DeepEquals, []byte("0123456789ABCDEF"))
}
Beispiel #7
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func (s *S) TestSliceMethods(c *C) {
	mmap, err := gommap.Map(s.file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_SHARED)
	c.Assert(err, IsNil)
	defer mmap.UnsafeUnmap()
	c.Assert([]byte(mmap), DeepEquals, testData)

	mmap[9] = 'X'
	mmap[7:10].Sync(gommap.MS_SYNC)

	fileData, err := ioutil.ReadFile(s.file.Name())
	c.Assert(err, IsNil)
	c.Assert(fileData, DeepEquals, []byte("012345678XABCDEF"))
}
Beispiel #8
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func (s *S) TestLock(c *C) {
	mmap, err := gommap.Map(s.file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_PRIVATE)
	c.Assert(err, IsNil)
	defer mmap.UnsafeUnmap()

	// A bit tricky to blackbox-test these.
	err = mmap.Lock()
	c.Assert(err, IsNil)

	err = mmap.Lock()
	c.Assert(err, IsNil)

	err = mmap.Unlock()
	c.Assert(err, IsNil)

	err = mmap.Unlock()
	c.Assert(err, IsNil)
}
Beispiel #9
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func (s *S) TestUnsafeUnmap(c *C) {
	mmap, err := gommap.Map(s.file.Fd(), gommap.PROT_READ|gommap.PROT_WRITE, gommap.MAP_SHARED)
	c.Assert(err, IsNil)
	c.Assert(mmap.UnsafeUnmap(), IsNil)
}