cranium2003 writes the following: > >when i strace cat /proc/my_file i found message >printing twice >Reading a from a /proc file.... >Reading a from a /proc file.... > Why that happening? The first read returns some data and returns the number of bytes, and the second one indicates that EOF has been reached by returning 0. A single read call can't do both of those things, so cat needs to do 2 reads. This has nothing to do with /proc or Linux; it is a logical consequence of the way read() is defined, and the job cat is supposed to do: it copies entire files to stdout, so it has to read until EOF. Only if the input file is empty will it see the EOF on the first read. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
