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