Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibCore/CProcessStatisticsReader.cpp

@@ -0,0 +1,58 @@
+#include <AK/JsonArray.h>
+#include <AK/JsonObject.h>
+#include <AK/JsonValue.h>
+#include <LibCore/CFile.h>
+#include <LibCore/CProcessStatisticsReader.h>
+#include <pwd.h>
+#include <stdio.h>
+
+CProcessStatisticsReader::CProcessStatisticsReader()
+{
+    setpwent();
+    while (auto* passwd = getpwent())
+        m_usernames.set(passwd->pw_uid, passwd->pw_name);
+    endpwent();
+}
+
+HashMap<pid_t, CProcessStatistics> CProcessStatisticsReader::get_map()
+{
+    HashMap<pid_t, CProcessStatistics> res;
+    update_map(res);
+    return res;
+}
+
+void CProcessStatisticsReader::update_map(HashMap<pid_t, CProcessStatistics>& map)
+{
+    CFile file("/proc/all");
+    if (!file.open(CIODevice::ReadOnly)) {
+        fprintf(stderr, "CProcessHelper : failed to open /proc/all: %s\n", file.error_string());
+        return;
+    }
+
+    auto file_contents = file.read_all();
+    auto json = JsonValue::from_string({ file_contents.data(), file_contents.size() });
+    json.as_array().for_each([&](auto& value) {
+        const JsonObject& process_object = value.as_object();
+        CProcessStatistics process;
+        process.pid = process_object.get("pid").to_u32();
+        process.nsched = process_object.get("times_scheduled").to_u32();
+        process.uid = process_object.get("uid").to_u32();
+        process.username = get_username_from_uid(process.uid);
+        process.priority = process_object.get("priority").to_string();
+        process.syscalls = process_object.get("syscall_count").to_u32();
+        process.state = process_object.get("state").to_string();
+        process.name = process_object.get("name").to_string();
+        process.virtual_size = process_object.get("amount_virtual").to_u32();
+        process.physical_size = process_object.get("amount_resident").to_u32();
+        map.set(process.pid, process);
+    });
+}
+
+String CProcessStatisticsReader::get_username_from_uid(const uid_t uid)
+{
+    auto it = m_usernames.find(uid);
+    if (it != m_usernames.end())
+        return (*it).value;
+    else
+        return String::number(uid);
+}