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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 <sys/sysctl.h>
#include <sys/types.h>
#include <unistd.h>
#include "base/logging.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, 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, arraysize(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, arraysize(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
size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc);
kinfo_procs_.resize(num_of_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, arraysize(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, arraysize(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');
Tokenize(data, delimiters, &entry_.cmd_line_args_);
// |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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