Reputation: 3207
(Clojure newbie)
On my linux machine, slurping /proc/cpuinfo
raises an error:
user=> (slurp "/proc/cpuinfo")
java.io.IOException: Invalid argument (NO_SOURCE_FILE:0)
Anybody knows why that is? (is the /proc filesystem some kind of second-class citizen in Java?)
Edit: the following code, adapted from nakkaya.com, works flawlessly:
(with-open [rdr (java.io.BufferedReader.
(java.io.FileReader. "/proc/cpuinfo"))]
(let [seq (line-seq rdr)]
(apply print seq)))
I wonder why this difference ?
Upvotes: 4
Views: 873
Reputation: 643
I've had a similar problem with files in /proc. The solution is simple though:
(slurp (java.io.FileReader. "/proc/cpuinfo"))
Upvotes: 7
Reputation: 91534
the problem is that java cannot open a DataInputStream on /proc so the slurp function isnt going to help you here, sorry :(
/proc/cpuinfo is a little strange because it has a file size of zero and produces bytes when read. this upsets the smarter java file handling classes.
ls -l /proc/cpuinfo
-r--r--r-- 1 root root 0 2012-01-20 00:10 /proc/cpuinfo
see this thread for more http://www.velocityreviews.com/forums/t131093-java-cannot-access-proc-filesystem-on-linux.html
you are going to have to open it with a FileReader. I'll add an example in a bit
Upvotes: 3