base/process/process_iterator_openbsd.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 <errno.h>
   8 #include <sys/sysctl.h>
   9
  10 #include "base/logging.h"
  11 #include "base/strings/string_util.h"
  12
  13 namespace base {
  14
  15 ProcessIterator::ProcessIterator(const ProcessFilter* filter)
  16     : index_of_kinfo_proc_(),
  17       filter_(filter) {
  18
  19   int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_UID, getuid(),
  20                 sizeof(struct kinfo_proc), 0 };
  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       DLOG(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           DLOG(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     DLOG(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   for (; index_of_kinfo_proc_ < kinfo_procs_.size(); ++index_of_kinfo_proc_) {
  68     kinfo_proc& kinfo = kinfo_procs_[index_of_kinfo_proc_];
  69
  70     // Skip processes just awaiting collection
  71     if ((kinfo.p_pid > 0) && (kinfo.p_stat == SZOMB))
  72       continue;
  73
  74     int mib[] = { CTL_KERN, KERN_PROC_ARGS, kinfo.p_pid };
  75
  76     // Find out what size buffer we need.
  77     size_t data_len = 0;
  78     if (sysctl(mib, arraysize(mib), NULL, &data_len, NULL, 0) < 0) {
  79       DVPLOG(1) << "failed to figure out the buffer size for a commandline";
  80       continue;
  81     }
  82
  83     data.resize(data_len);
  84     if (sysctl(mib, arraysize(mib), &data[0], &data_len, NULL, 0) < 0) {
  85       DVPLOG(1) << "failed to fetch a commandline";
  86       continue;
  87     }
  88
  89     // |data| contains all the command line parameters of the process, separated
  90     // by blocks of one or more null characters. We tokenize |data| into a
  91     // vector of strings using '\0' as a delimiter and populate
  92     // |entry_.cmd_line_args_|.
  93     std::string delimiters;
  94     delimiters.push_back('\0');
  95     Tokenize(data, delimiters, &entry_.cmd_line_args_);
  96
  97     // |data| starts with the full executable path followed by a null character.
  98     // We search for the first instance of '\0' and extract everything before it
  99     // to populate |entry_.exe_file_|.
 100     size_t exec_name_end = data.find('\0');
 101     if (exec_name_end == std::string::npos) {
 102       DLOG(ERROR) << "command line data didn't match expected format";
 103       continue;
 104     }
 105
 106     entry_.pid_ = kinfo.p_pid;
 107     entry_.ppid_ = kinfo.p_ppid;
 108     entry_.gid_ = kinfo.p__pgid;
 109     size_t last_slash = data.rfind('/', exec_name_end);
 110     if (last_slash == std::string::npos)
 111       entry_.exe_file_.assign(data, 0, exec_name_end);
 112     else
 113       entry_.exe_file_.assign(data, last_slash + 1,
 114                               exec_name_end - last_slash - 1);
 115     // Start w/ the next entry next time through
 116     ++index_of_kinfo_proc_;
 117     // Done
 118     return true;
 119   }
 120   return false;
 121 }
 122
 123 bool NamedProcessIterator::IncludeEntry() {
 124   return (executable_name_ == entry().exe_file() &&
 125           ProcessIterator::IncludeEntry());
 126 }
 127
 128 }  // namespace base