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The lseek function can legitimately return a code less then zero ( except for -1 ) when seeking beyond an offset of 2^63. This behavior should be supported in order to permit the python interpreter to seek in files with valid data at locations greater than or equal to 2^63. This can happen in a sparse file or in the /proc file system address space file. 
The fix is simple. In the posix_lseek function check for result != -1 instead of checking for result < 0 in return code checks of the value returned by lseek.