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319
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1 Using python with yaffsfs
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2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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3
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4 Herewith a brief session showing yaffs direct being accessed from python.
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5
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6 I tried SWIG first, but ctypes turned out to be way, way easier...
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7
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8 Thanks to the people on NZPUG mailing list that helped with the exercise.
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9
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10 Build libyaffsfs.so with the accompanying Makefile.
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11
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12 $ make libyaffsfs.so
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13
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14 $ python
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15 Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
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16 [GCC 4.3.3] on linux2
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17 Type "help", "copyright", "credits" or "license" for more information.
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18 >>> from ctypes import *
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19 >>> cdll.LoadLibrary("./libyaffsfs.so")
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20 <CDLL './libyaffsfs.so', handle 9ed4178 at b7d418ac>
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21 >>> y = CDLL("./libyaffsfs.so")
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22 >>> y.yaffs_StartUp()
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23 0
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24 >>> y.yaffs_mount("/yaffs2")
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25 yaffs: Mounting /yaffs2
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26 yaffs: yaffs_GutsInitialise()
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27 yaffs_ScanBackwards starts intstartblk 1 intendblk 256...
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28 0 blocks to be sorted...
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29 ...done
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30 yaffs_ScanBackwards ends
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31
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32 Block summary
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33 0 blocks have illegal states
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34 Unknown 0 blocks
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35 Needs scanning 0 blocks
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36 Scanning 0 blocks
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37 Empty 256 blocks
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38 Allocating 0 blocks
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39 Full 0 blocks
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40 Dirty 0 blocks
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41 Checkpoint 0 blocks
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42 Collecting 0 blocks
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43 Dead 0 blocks
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44
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45 yaffs: yaffs_GutsInitialise() done.
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46
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47 0
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48 >>> y.yaffs_open("/yaffs2/xx",66,0666)
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49 yaffs: Tnodes added
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50 Allocated block 1, seq 4097, 255 left
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51 0
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52 >>> y.yaffs_write(0,"abc",3)
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53 3
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54 >>> y.yaffs_lseek(0,0,0)
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55 0
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56 >>> b = create_string_buffer("",100)
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57 >>> y.yaffs_read(0,b,100)
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58 3
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59 >>> b.value
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60 'abc'
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61 >>>
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62
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