Question

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How to check whether two file names point to the same physical file

How can I know if two hardlinks are connected to one file from C in Linux.

Thanks.

Answer 1

Use stat or fstat. The stat structure they fill out contains the inode number. If the two are connected, the st_ino fields should have the same value.

Since inode numbers are only unique to a device you’ll also need to check the device ID (st_dev).