base/process/process_iterator_freebsd.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/process/process_iterator.h"
   6
   7 #include <sys/sysctl.h>
   8
   9 #include "base/logging.h"
  10 #include "base/strings/string_util.h"
  11
  12 namespace base {
  13
  14 ProcessIterator::ProcessIterator(const ProcessFilter* filter)
  15     : index_of_kinfo_proc_(),
  16       filter_(filter) {
  17
  18   int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_UID, getuid() };
  19
  20   bool done = false;
  21   int try_num = 1;
  22   const int max_tries = 10;
  23
  24   do {
  25     size_t len = 0;
  26     if (sysctl(mib, arraysize(mib), NULL, &len, NULL, 0) < 0) {
  27       LOG(ERROR) << "failed to get the size needed for the process list";
  28       kinfo_procs_.resize(0);
  29       done = true;
  30     } else {
  31       size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc);
  32       // Leave some spare room for process table growth (more could show up
  33       // between when we check and now)
  34       num_of_kinfo_proc += 16;
  35       kinfo_procs_.resize(num_of_kinfo_proc);
  36       len = num_of_kinfo_proc * sizeof(struct kinfo_proc);
  37       if (sysctl(mib, arraysize(mib), &kinfo_procs_[0], &len, NULL, 0) <0) {
  38         // If we get a mem error, it just means we need a bigger buffer, so
  39         // loop around again.  Anything else is a real error and give up.
  40         if (errno != ENOMEM) {
  41           LOG(ERROR) << "failed to get the process list";
  42           kinfo_procs_.resize(0);
  43           done = true;
  44         }
  45       } else {
  46         // Got the list, just make sure we're sized exactly right
  47         size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc);
  48         kinfo_procs_.resize(num_of_kinfo_proc);
  49         done = true;
  50       }
  51     }
  52   } while (!done && (try_num++ < max_tries));
  53
  54   if (!done) {
  55     LOG(ERROR) << "failed to collect the process list in a few tries";
  56     kinfo_procs_.resize(0);
  57   }
  58 }
  59
  60 ProcessIterator::~ProcessIterator() {
  61 }
  62
  63 bool ProcessIterator::CheckForNextProcess() {
  64   std::string data;
  65
  66   for (; index_of_kinfo_proc_ < kinfo_procs_.size(); ++index_of_kinfo_proc_) {
  67     size_t length;
  68     struct kinfo_proc kinfo = kinfo_procs_[index_of_kinfo_proc_];
  69     int mib[] = { CTL_KERN, KERN_PROC_ARGS, kinfo.ki_pid };
  70
  71     if ((kinfo.ki_pid > 0) && (kinfo.ki_stat == SZOMB))
  72       continue;
  73
  74     length = 0;
  75     if (sysctl(mib, arraysize(mib), NULL, &length, NULL, 0) < 0) {
  76       LOG(ERROR) << "failed to figure out the buffer size for a command line";
  77       continue;
  78     }
  79
  80     data.resize(length);
  81
  82     if (sysctl(mib, arraysize(mib), &data[0], &length, NULL, 0) < 0) {
  83       LOG(ERROR) << "failed to fetch a commandline";
  84       continue;
  85     }
  86
  87     std::string delimiters;
  88     delimiters.push_back('\0');
  89     Tokenize(data, delimiters, &entry_.cmd_line_args_);
  90
  91     size_t exec_name_end = data.find('\0');
  92     if (exec_name_end == std::string::npos) {
  93       LOG(ERROR) << "command line data didn't match expected format";
  94       continue;
  95     }
  96
  97     entry_.pid_ = kinfo.ki_pid;
  98     entry_.ppid_ = kinfo.ki_ppid;
  99     entry_.gid_ = kinfo.ki_pgid;
 100
 101     size_t last_slash = data.rfind('/', exec_name_end);
 102     if (last_slash == std::string::npos) {
 103       entry_.exe_file_.assign(data, 0, exec_name_end);
 104     } else {
 105       entry_.exe_file_.assign(data, last_slash + 1,
 106                               exec_name_end - last_slash - 1);
 107     }
 108
 109     // Start w/ the next entry next time through
 110     ++index_of_kinfo_proc_;
 111
 112     return true;
 113   }
 114   return false;
 115 }
 116
 117 bool NamedProcessIterator::IncludeEntry() {
 118   if (executable_name_ != entry().exe_file())
 119     return false;
 120
 121   return ProcessIterator::IncludeEntry();
 122 }
 123
 124 }  // namespace base