Frage

I am using

  1. unistd.h
  2. sys/stat.h

and what is interesting is that st_size is bigger than the value returned after read()? st.st_size returns 644 - read() returns 606, Any thoughts?

War es hilfreich?

Lösung

Size of file and size of stream may not match. For example, when you open file in text mode, OS can translate multi-byte EOL sequences into single char. This is usually visible on Windows, but if you have a Windows file on Linux, the effect can be the same.

Andere Tipps

The memory is allocated in multiples of blocks (st_blocks). The remaining bytes you noticed are due to block alignment.

If you check the value of st.st_blocks you will see that it is a good divisor for 644, while not to 606.

So, if you want to know the real size occupied with data, do not use st_size.

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