erlang - Elixir File.read returns empty data when accessing /proc/cpuinfo -

when running thing

file.read "/proc/cpuinfo" >> {:ok, ""} 

same equivalent erlang function. there reason pattern?

like @josé mentioned proc fs special since file contents generated on fly. if @ file sizes in /proc you'll see have size 0.

i believe why read function fails return anything, file empty!

the workaround force-read number of bytes anyway, in erlang can do:

{ok, fd} = file:open("/proc/cpuinfo", [read]). file:read(fd, 1024). 

to read content keep reading fixed number of bytes until eof returned read.