Backup for process name and state

CHANGELOG.md

@@ -2,6 +2,7 @@
 ================
 * [#1359](https://github.com/oshi/oshi/pull/1359): Set suppressed network filesystem types and pseudo filesystem types via config - [@J-Jimmy](https://github.com/J-Jimmy).
 * [#1362](https://github.com/oshi/oshi/pull/1362): Correct invalid Windows processor bitmask logic on 64th core - [@J-Jimmy](https://github.com/J-Jimmy).
+* [#1368](https://github.com/oshi/oshi/pull/1368): Backup for getting process name and state - [@J-Jimmy](https://github.com/J-Jimmy).
 * Your contribution here
 
 5.3.0 (2020-10-11)

oshi-core/src/main/java/oshi/software/os/linux/LinuxOSProcess.java

@@ -53,6 +53,7 @@
 import oshi.util.ExecutingCommand;
 import oshi.util.FileUtil;
 import oshi.util.ParseUtil;
+import oshi.util.Util;
 import oshi.util.platform.linux.ProcPath;
 
 @ThreadSafe
@@ -294,6 +295,10 @@ public boolean updateAttributes() {
             this.state = INVALID;
             return false;
         }
+        // If some details couldn't be read from ProcPath.PID_STATUS try reading it from
+        // ProcPath.PID_STAT
+        getMissingDetails(status, stat);
+
         long now = System.currentTimeMillis();
 
         // We can get name and status more easily from /proc/pid/status which we
@@ -339,6 +344,40 @@ public boolean updateAttributes() {
         return true;
     }
 
+    /**
+     * If some details couldn't be read from ProcPath.PID_STATUS try reading it from
+     * ProcPath.PID_STAT
+     *
+     * @param status
+     *            status map to fill.
+     * @param stat
+     *            string to read from.
+     */
+    private static void getMissingDetails(Map<String, String> status, String stat) {
+        if (status == null || stat == null) {
+            return;
+        }
+
+        int nameStart = stat.indexOf("(");
+        int nameEnd = stat.indexOf(")");
+        if (Util.isBlank(status.get("Name")) && nameStart < nameEnd) {
+            // remove leading and trailing parentheses
+            String statName = stat.substring(nameStart, nameEnd + 1);
+            statName = statName.substring(1, statName.length() - 1);
+            status.put("Name", statName);
+        }
+
+        // get the rest of the string from after the name
+        // (the name may contain whitespaces and destroy the index)
+        String statEnd = stat.substring(nameEnd + 2);
+        String[] statSplit = ParseUtil.whitespaces.split(statEnd);
+        // As per man, the next item after the name is the state
+        if (Util.isBlank(status.get("State")) && statSplit.length > 0) {
+            String statState = statSplit[0];
+            status.put("State", statState);
+        }
+    }
+
     /**
      * Enum used to update attributes. The order field represents the 1-indexed
      * numeric order of the stat in /proc/pid/stat per the man file.