Squashed 'OpenVPN Adapter/Vendors/openvpn/' content from commit da99df6

git-subtree-dir: OpenVPN Adapter/Vendors/openvpn
git-subtree-split: da99df69492256d7a18bbea303ae98457782a4bf

javacli/android/cpu.cpp

@@ -0,0 +1,62 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Technologies, Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#include <stdio.h>
+#include <unistd.h>
+#include <jni.h>
+
+#ifdef SWIGEXPORT
+#define EXPORT SWIGEXPORT
+#else
+#define EXPORT
+#endif
+
+#ifndef OPENVPN_PACKAGE_ID
+#error OPENVPN_PACKAGE_ID must be defined
+#endif
+
+#define MAKE_SYM2(pkg_id, suffix) Java_ ## pkg_id ## _CPUUsage_ ## suffix
+#define MAKE_SYM(pkg_id, suffix) MAKE_SYM2(pkg_id, suffix)
+
+#define CPU_USAGE MAKE_SYM(OPENVPN_PACKAGE_ID, cpu_1usage)
+
+extern "C" {
+  jdouble CPU_USAGE(JNIEnv* env, jclass);
+};
+
+EXPORT jdouble CPU_USAGE(JNIEnv* env, jclass)
+{
+  char fnbuf[64];
+  const pid_t pid = getpid();
+  double ret = 0.0;
+
+  snprintf(fnbuf, sizeof(fnbuf), "/proc/%u/stat", (unsigned int)pid);
+  FILE *fp = fopen(fnbuf, "r");
+  if (fp)
+    {
+      double user = 0.0;
+      double system = 0.0;
+      if (fscanf(fp, "%*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %*s %lf %lf", &user, &system) == 2)
+	ret = (user + system) / sysconf(_SC_CLK_TCK);
+      fclose(fp);
+    }
+  return ret;
+}