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/types.h>
   8 #include <sys/sysctl.h>
   9 #include <unistd.h>
  10
  11 #include "base/logging.h"
  12 #include "base/strings/string_util.h"
  13
  14 namespace base {
  15
  16 ProcessIterator::ProcessIterator(const ProcessFilter* filter)
  17     : index_of_kinfo_proc_(),
  18       filter_(filter) {
  19
  20   int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_UID, getuid() };
  21
  22   bool done = false;
  23   int try_num = 1;
  24   const int max_tries = 10;
  25
  26   do {
  27     size_t len = 0;
  28     if (sysctl(mib, arraysize(mib), NULL, &len, NULL, 0) < 0) {
  29       LOG(ERROR) << "failed to get the size needed for the process list";
  30       kinfo_procs_.resize(0);
  31       done = true;
  32     } else {
  33       size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc);
  34       // Leave some spare room for process table growth (more could show up
  35       // between when we check and now)
  36       num_of_kinfo_proc += 16;
  37       kinfo_procs_.resize(num_of_kinfo_proc);
  38       len = num_of_kinfo_proc * sizeof(struct kinfo_proc);
  39       if (sysctl(mib, arraysize(mib), &kinfo_procs_[0], &len, NULL, 0) <0) {
  40         // If we get a mem error, it just means we need a bigger buffer, so
  41         // loop around again.  Anything else is a real error and give up.
  42         if (errno != ENOMEM) {
  43           LOG(ERROR) << "failed to get the process list";
  44           kinfo_procs_.resize(0);
  45           done = true;
  46         }
  47       } else {
  48         // Got the list, just make sure we're sized exactly right
  49         size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc);
  50         kinfo_procs_.resize(num_of_kinfo_proc);
  51         done = true;
  52       }
  53     }
  54   } while (!done && (try_num++ < max_tries));
  55
  56   if (!done) {
  57     LOG(ERROR) << "failed to collect the process list in a few tries";
  58     kinfo_procs_.resize(0);
  59   }
  60 }
  61
  62 ProcessIterator::~ProcessIterator() {
  63 }
  64
  65 bool ProcessIterator::CheckForNextProcess() {
  66   std::string data;
  67
  68   for (; index_of_kinfo_proc_ < kinfo_procs_.size(); ++index_of_kinfo_proc_) {
  69     size_t length;
  70     struct kinfo_proc kinfo = kinfo_procs_[index_of_kinfo_proc_];
  71     int mib[] = { CTL_KERN, KERN_PROC_ARGS, kinfo.ki_pid };
  72
  73     if ((kinfo.ki_pid > 0) && (kinfo.ki_stat == SZOMB))
  74       continue;
  75
  76     length = 0;
  77     if (sysctl(mib, arraysize(mib), NULL, &length, NULL, 0) < 0) {
  78       LOG(ERROR) << "failed to figure out the buffer size for a command line";
  79       continue;
  80     }
  81
  82     data.resize(length);
  83
  84     if (sysctl(mib, arraysize(mib), &data[0], &length, NULL, 0) < 0) {
  85       LOG(ERROR) << "failed to fetch a commandline";
  86       continue;
  87     }
  88
  89     std::string delimiters;
  90     delimiters.push_back('\0');
  91     Tokenize(data, delimiters, &entry_.cmd_line_args_);
  92
  93     size_t exec_name_end = data.find('\0');
  94     if (exec_name_end == std::string::npos) {
  95       LOG(ERROR) << "command line data didn't match expected format";
  96       continue;
  97     }
  98
  99     entry_.pid_ = kinfo.ki_pid;
 100     entry_.ppid_ = kinfo.ki_ppid;
 101     entry_.gid_ = kinfo.ki_pgid;
 102
 103     size_t last_slash = data.rfind('/', exec_name_end);
 104     if (last_slash == std::string::npos) {
 105       entry_.exe_file_.assign(data, 0, exec_name_end);
 106     } else {
 107       entry_.exe_file_.assign(data, last_slash + 1,
 108                               exec_name_end - last_slash - 1);
 109     }
 110
 111     // Start w/ the next entry next time through
 112     ++index_of_kinfo_proc_;
 113
 114     return true;
 115   }
 116   return false;
 117 }
 118
 119 bool NamedProcessIterator::IncludeEntry() {
 120   if (executable_name_ != entry().exe_file())
 121     return false;
 122
 123   return ProcessIterator::IncludeEntry();
 124 }
 125
 126 }  // namespace base