fix #1004 / linux / Process.io_counters(): fix possible ValueError

HISTORY.rst

@@ -8,8 +8,9 @@
 **Bug fixes**
 
 - 1000_: fixed some setup.py warnings.
-- 1002_: remove C macro which will not be available on new Solaris versions.
-  (patch by Danek Duvall)
+- 1002_: [SunOS] remove C macro which will not be available on new Solaris
+  versions. (patch by Danek Duvall)
+- 1004_: [Linux] Process.io_counters() may raise ValueError.
 
 *2017-03-24*
 
@@ -18,12 +19,12 @@
 
 **Bug fixes**
 
-- 996_: [Linux] sensors_temperatures() may not show all temperatures.
-- 997_: [FreeBSD] virtual_memory() may fail due to missing sysctl parameter on
-  FreeBSD 12.
 - 981_: [Linux] cpu_freq() may return an empty list.
 - 993_: [Windows] Process.memory_maps() on Python 3 may raise
   UnicodeDecodeError.
+- 996_: [Linux] sensors_temperatures() may not show all temperatures.
+- 997_: [FreeBSD] virtual_memory() may fail due to missing sysctl parameter on
+  FreeBSD 12.
 
 *2017-03-05*
 

README.rst

@@ -41,7 +41,7 @@ Summary
 
 psutil (process and system utilities) is a cross-platform library for
 retrieving information on **running processes** and **system utilization**
-(CPU, memory, disks, networkm sensors) in Python.
+(CPU, memory, disks, network, sensors) in Python.
 It is useful mainly for **system monitoring**, **profiling and limiting process
 resources** and **management of running processes**.
 It implements many functionalities offered by command line tools such as:

psutil/_pslinux.py

@@ -1448,8 +1448,13 @@ def io_counters(self):
             fields = {}
             with open_binary(fname) as f:
                 for line in f:
-                    name, value = line.split(b': ')
-                    fields[name] = int(value)
+                    # https://github.com/giampaolo/psutil/issues/1004
+                    line = line.strip()
+                    if line:
+                        name, value = line.split(b': ')
+                        fields[name] = int(value)
+            if not fields:
+                raise RuntimeError("%s file was empty" % fname)
             return pio(
                 fields[b'syscr'],  # read syscalls
                 fields[b'syscw'],  # write syscalls