1 /*
   2  * Copyright 2012, 2013 SAP AG. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "runtime/arguments.hpp"
  26 #include "libperfstat_aix.hpp"
  27 
  28 // For dlopen and friends
  29 #include <fcntl.h>
  30 
  31 // handle to the libperfstat
  32 static void* g_libhandle = NULL;
  33 
  34 // whether initialization worked
  35 static bool g_initialized = false;
  36 
  37 
  38 typedef int (*fun_perfstat_cpu_total_t) (perfstat_id_t *name, perfstat_cpu_total_t* userbuff,
  39                                          int sizeof_userbuff, int desired_number);
  40 
  41 typedef int (*fun_perfstat_memory_total_t) (perfstat_id_t *name, perfstat_memory_total_t* userbuff,
  42                                             int sizeof_userbuff, int desired_number);
  43 
  44 typedef void (*fun_perfstat_reset_t) ();
  45 
  46 static fun_perfstat_cpu_total_t     g_fun_perfstat_cpu_total = NULL;
  47 static fun_perfstat_memory_total_t  g_fun_perfstat_memory_total = NULL;
  48 static fun_perfstat_reset_t         g_fun_perfstat_reset = NULL;
  49 
  50 bool libperfstat::init() {
  51 
  52   if (g_initialized) {
  53     return true;
  54   }
  55 
  56   g_initialized = false;
  57 
  58   // dynamically load the libperfstat porting library.
  59   g_libhandle = dlopen("/usr/lib/libperfstat.a(shr_64.o)", RTLD_MEMBER | RTLD_NOW);
  60   if (!g_libhandle) {
  61     if (Verbose) {
  62       fprintf(stderr, "Cannot load libperfstat.a (dlerror: %s)", dlerror());
  63     }
  64     return false;
  65   }
  66 
  67   // resolve function pointers
  68 
  69 #define RESOLVE_FUN_NO_ERROR(name) \
  70   g_fun_##name = (fun_##name##_t) dlsym(g_libhandle, #name);
  71 
  72 #define RESOLVE_FUN(name) \
  73   RESOLVE_FUN_NO_ERROR(name) \
  74   if (!g_fun_##name) { \
  75     if (Verbose) { \
  76       fprintf(stderr, "Cannot resolve " #name "() from libperfstat.a\n" \
  77                       "   (dlerror: %s)", dlerror()); \
  78       } \
  79     return false; \
  80   }
  81 
  82   RESOLVE_FUN(perfstat_cpu_total);
  83   RESOLVE_FUN(perfstat_memory_total);
  84   RESOLVE_FUN(perfstat_reset);
  85 
  86   g_initialized = true;
  87 
  88   return true;
  89 }
  90 
  91 void libperfstat::cleanup() {
  92 
  93   g_initialized = false;
  94 
  95   if (g_libhandle) {
  96     dlclose(g_libhandle);
  97     g_libhandle = NULL;
  98   }
  99 
 100   g_fun_perfstat_cpu_total = NULL;
 101   g_fun_perfstat_memory_total = NULL;
 102   g_fun_perfstat_reset = NULL;
 103 }
 104 
 105 int libperfstat::perfstat_memory_total(perfstat_id_t *name,
 106                                        perfstat_memory_total_t* userbuff,
 107                                        int sizeof_userbuff, int desired_number) {
 108   assert(g_initialized, "libperfstat not initialized");
 109   assert(g_fun_perfstat_memory_total, "");
 110   return g_fun_perfstat_memory_total(name, userbuff, sizeof_userbuff, desired_number);
 111 }
 112 
 113 int libperfstat::perfstat_cpu_total(perfstat_id_t *name, perfstat_cpu_total_t* userbuff,
 114                                     int sizeof_userbuff, int desired_number) {
 115   assert(g_initialized, "libperfstat not initialized");
 116   assert(g_fun_perfstat_cpu_total, "");
 117   return g_fun_perfstat_cpu_total(name, userbuff, sizeof_userbuff, desired_number);
 118 }
 119 
 120 void libperfstat::perfstat_reset() {
 121   assert(g_initialized, "libperfstat not initialized");
 122   assert(g_fun_perfstat_reset, "");
 123   g_fun_perfstat_reset();
 124 }