src/base/hostinfo.cc

   1 /*
   2  * Copyright (c) 2003-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Nathan Binkert
  29  */
  30
  31 #include <unistd.h>
  32
  33 #ifdef __APPLE__
  34 #include <mach/mach_init.h>
  35 #include <mach/shared_region.h>
  36 #include <mach/task.h>
  37
  38 #endif
  39
  40 #include "base/hostinfo.hh"
  41
  42 #include <cctype>
  43 #include <cerrno>
  44 #include <cmath>
  45 #include <cstdio>
  46 #include <cstdlib>
  47 #include <cstring>
  48 #include <string>
  49
  50 #include "base/logging.hh"
  51 #include "base/str.hh"
  52 #include "base/types.hh"
  53
  54 using namespace std;
  55
  56 string
  57 __get_hostname()
  58 {
  59     char host[256];
  60     if (gethostname(host, sizeof host) == -1)
  61         warn("could not get host name!");
  62     return host;
  63 }
  64
  65 string &
  66 hostname()
  67 {
  68     static string hostname = __get_hostname();
  69     return hostname;
  70 }
  71
  72 uint64_t
  73 procInfo(const char *filename, const char *target)
  74 {
  75     int  done = 0;
  76     char line[80];
  77     char format[80];
  78     long usage;
  79
  80     FILE *fp = fopen(filename, "r");
  81
  82     while (fp && !feof(fp) && !done) {
  83         if (fgets(line, 80, fp)) {
  84             if (startswith(line, target)) {
  85                 snprintf(format, sizeof(format), "%s %%ld", target);
  86                 sscanf(line, format, &usage);
  87
  88                 fclose(fp);
  89                 return usage ;
  90             }
  91         }
  92     }
  93
  94     if (fp)
  95         fclose(fp);
  96
  97     return 0;
  98 }
  99
 100 uint64_t
 101 memUsage()
 102 {
 103 // For the Mach-based Darwin kernel, use the task_info of the self task
 104 #ifdef __APPLE__
 105     struct task_basic_info t_info;
 106     mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
 107
 108     if (KERN_SUCCESS != task_info(mach_task_self(),
 109                                   TASK_BASIC_INFO, (task_info_t)&t_info,
 110                                   &t_info_count)) {
 111         return 0;
 112     }
 113
 114     // Mimic Darwin's implementation of top and subtract
 115     // SHARED_REGION_SIZE from the tasks virtual size to account for the
 116     // shared memory submap that is incorporated into every process.
 117     return (t_info.virtual_size - SHARED_REGION_SIZE) / 1024;
 118 #else
 119     // Linux implementation
 120     return procInfo("/proc/self/status", "VmSize:");
 121 #endif
 122 }