135 lines
4.5 KiB
C++
135 lines
4.5 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/process/process_iterator.h"
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#include <errno.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include "base/logging.h"
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#include "base/strings/string_util.h"
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namespace base {
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ProcessIterator::ProcessIterator(const ProcessFilter* filter)
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: index_of_kinfo_proc_(0),
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filter_(filter) {
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// Get a snapshot of all of my processes (yes, as we loop it can go stale, but
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// but trying to find where we were in a constantly changing list is basically
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// impossible.
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int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_UID, geteuid() };
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// Since more processes could start between when we get the size and when
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// we get the list, we do a loop to keep trying until we get it.
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bool done = false;
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int try_num = 1;
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const int max_tries = 10;
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do {
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// Get the size of the buffer
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size_t len = 0;
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if (sysctl(mib, arraysize(mib), NULL, &len, NULL, 0) < 0) {
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DLOG(ERROR) << "failed to get the size needed for the process list";
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kinfo_procs_.resize(0);
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done = true;
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} else {
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size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc);
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// Leave some spare room for process table growth (more could show up
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// between when we check and now)
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num_of_kinfo_proc += 16;
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kinfo_procs_.resize(num_of_kinfo_proc);
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len = num_of_kinfo_proc * sizeof(struct kinfo_proc);
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// Load the list of processes
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if (sysctl(mib, arraysize(mib), &kinfo_procs_[0], &len, NULL, 0) < 0) {
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// If we get a mem error, it just means we need a bigger buffer, so
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// loop around again. Anything else is a real error and give up.
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if (errno != ENOMEM) {
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DLOG(ERROR) << "failed to get the process list";
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kinfo_procs_.resize(0);
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done = true;
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}
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} else {
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// Got the list, just make sure we're sized exactly right
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size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc);
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kinfo_procs_.resize(num_of_kinfo_proc);
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done = true;
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}
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}
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} while (!done && (try_num++ < max_tries));
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if (!done) {
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DLOG(ERROR) << "failed to collect the process list in a few tries";
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kinfo_procs_.resize(0);
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}
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}
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ProcessIterator::~ProcessIterator() {
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}
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bool ProcessIterator::CheckForNextProcess() {
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std::string data;
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for (; index_of_kinfo_proc_ < kinfo_procs_.size(); ++index_of_kinfo_proc_) {
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kinfo_proc& kinfo = kinfo_procs_[index_of_kinfo_proc_];
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// Skip processes just awaiting collection
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if ((kinfo.kp_proc.p_pid > 0) && (kinfo.kp_proc.p_stat == SZOMB))
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continue;
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int mib[] = { CTL_KERN, KERN_PROCARGS, kinfo.kp_proc.p_pid };
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// Find out what size buffer we need.
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size_t data_len = 0;
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if (sysctl(mib, arraysize(mib), NULL, &data_len, NULL, 0) < 0) {
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DVPLOG(1) << "failed to figure out the buffer size for a commandline";
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continue;
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}
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data.resize(data_len);
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if (sysctl(mib, arraysize(mib), &data[0], &data_len, NULL, 0) < 0) {
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DVPLOG(1) << "failed to fetch a commandline";
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continue;
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}
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// |data| contains all the command line parameters of the process, separated
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// by blocks of one or more null characters. We tokenize |data| into a
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// vector of strings using '\0' as a delimiter and populate
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// |entry_.cmd_line_args_|.
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std::string delimiters;
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delimiters.push_back('\0');
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Tokenize(data, delimiters, &entry_.cmd_line_args_);
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// |data| starts with the full executable path followed by a null character.
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// We search for the first instance of '\0' and extract everything before it
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// to populate |entry_.exe_file_|.
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size_t exec_name_end = data.find('\0');
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if (exec_name_end == std::string::npos) {
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DLOG(ERROR) << "command line data didn't match expected format";
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continue;
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}
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entry_.pid_ = kinfo.kp_proc.p_pid;
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entry_.ppid_ = kinfo.kp_eproc.e_ppid;
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entry_.gid_ = kinfo.kp_eproc.e_pgid;
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size_t last_slash = data.rfind('/', exec_name_end);
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if (last_slash == std::string::npos)
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entry_.exe_file_.assign(data, 0, exec_name_end);
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else
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entry_.exe_file_.assign(data, last_slash + 1,
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exec_name_end - last_slash - 1);
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// Start w/ the next entry next time through
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++index_of_kinfo_proc_;
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// Done
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return true;
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}
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return false;
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}
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bool NamedProcessIterator::IncludeEntry() {
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return (executable_name_ == entry().exe_file() &&
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ProcessIterator::IncludeEntry());
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}
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} // namespace base
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