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 }