[cs631apue] How to prevent "creat" open already opened file

[Shenghan Gao]

Hi everyone,

Currently, I'm implementing tcp. If I use tcp like this:

./tcp  ./filename filename

The file would be set to 0 bytes. Is there a way that I could prevent copy
target are actually the same file with the copy source.

I know I could compare names of two paths. But simply compare the name
couldn't prevent this if there is a symbolic link.

Shenghan Gao
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