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  • These POSIX links can be handy to dismiss any doubt: write: "Upon successful completion, where nbyte is greater than 0, write() shall mark for update the last data modification and last file status change timestamps of the file" , vs read: "Upon successful completion, where nbyte is greater than 0, read() shall mark for update the last data access timestamp of the file, and shall return the number of bytes read" : no ctime for read. Commented Oct 7, 2022 at 15:00