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// Copyright (c) 2008 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_util.h"
#import <Cocoa/Cocoa.h>
#include <crt_externs.h>
#include <mach/mach_init.h>
#include <mach/task.h>
#include <spawn.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string>
#include "base/eintr_wrapper.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#include "base/time.h"
namespace base {
void RestoreDefaultExceptionHandler() {
// This function is tailored to remove the Breakpad exception handler.
// exception_mask matches s_exception_mask in
// breakpad/src/client/mac/handler/exception_handler.cc
const exception_mask_t exception_mask = EXC_MASK_BAD_ACCESS |
EXC_MASK_BAD_INSTRUCTION |
EXC_MASK_ARITHMETIC |
EXC_MASK_BREAKPOINT;
// Setting the exception port to MACH_PORT_NULL may not be entirely
// kosher to restore the default exception handler, but in practice,
// it results in the exception port being set to Apple Crash Reporter,
// the desired behavior.
task_set_exception_ports(mach_task_self(), exception_mask, MACH_PORT_NULL,
EXCEPTION_DEFAULT, THREAD_STATE_NONE);
}
NamedProcessIterator::NamedProcessIterator(const std::wstring& executable_name,
const ProcessFilter* filter)
: executable_name_(executable_name),
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) {
LOG(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 += 4;
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) {
LOG(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) {
LOG(ERROR) << "failed to collect the process list in a few tries";
kinfo_procs_.resize(0);
}
}
NamedProcessIterator::~NamedProcessIterator() {
}
const ProcessEntry* NamedProcessIterator::NextProcessEntry() {
bool result = false;
do {
result = CheckForNextProcess();
} while (result && !IncludeEntry());
if (result) {
return &entry_;
}
return NULL;
}
bool NamedProcessIterator::CheckForNextProcess() {
std::string executable_name_utf8(base::SysWideToUTF8(executable_name_));
std::string data;
std::string exec_name;
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 };
// Found out what size buffer we need
size_t data_len = 0;
if (sysctl(mib, arraysize(mib), NULL, &data_len, NULL, 0) < 0) {
LOG(ERROR) << "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) {
LOG(ERROR) << "failed to fetch a commandline";
continue;
}
// Data starts w/ the full path null termed, so we have to extract just the
// executable name from the path.
size_t exec_name_end = data.find('\0');
if (exec_name_end == std::string::npos) {
LOG(ERROR) << "command line data didn't match expected format";
continue;
}
size_t last_slash = data.rfind('/', exec_name_end);
if (last_slash == std::string::npos)
exec_name = data.substr(0, exec_name_end);
else
exec_name = data.substr(last_slash + 1, exec_name_end - last_slash - 1);
// Check the name
if (executable_name_utf8 == exec_name) {
entry_.pid = kinfo->kp_proc.p_pid;
entry_.ppid = kinfo->kp_eproc.e_ppid;
base::strlcpy(entry_.szExeFile, exec_name.c_str(),
sizeof(entry_.szExeFile));
// Start w/ the next entry next time through
++index_of_kinfo_proc_;
// Done
return true;
}
}
return false;
}
bool NamedProcessIterator::IncludeEntry() {
// Don't need to check the name, we did that w/in CheckForNextProcess.
if (!filter_)
return true;
return filter_->Includes(entry_.pid, entry_.ppid);
}
// ------------------------------------------------------------------------
// NOTE: about ProcessMetrics
//
// Mac doesn't have /proc, and getting a mach task from a pid for another
// process requires permissions, so there doesn't really seem to be a way
// to do these (and spinning up ps to fetch each stats seems dangerous to
// put in a base api for anyone to call.
//
bool ProcessMetrics::GetIOCounters(IoCounters* io_counters) const {
return false;
}
size_t ProcessMetrics::GetPagefileUsage() const {
return 0;
}
size_t ProcessMetrics::GetPeakPagefileUsage() const {
return 0;
}
size_t ProcessMetrics::GetWorkingSetSize() const {
return 0;
}
size_t ProcessMetrics::GetPeakWorkingSetSize() const {
return 0;
}
size_t ProcessMetrics::GetPrivateBytes() const {
return 0;
}
void ProcessMetrics::GetCommittedKBytes(CommittedKBytes* usage) const {
}
bool ProcessMetrics::GetWorkingSetKBytes(WorkingSetKBytes* ws_usage) const {
return false;
}
// ------------------------------------------------------------------------
} // namespace base
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