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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "utils.h"
#include <inttypes.h>
#include <pthread.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <memory>
#include "android-base/file.h"
#include "android-base/stringprintf.h"
#include "android-base/strings.h"
#include "base/os.h"
#if defined(__APPLE__)
#include <crt_externs.h>
#include <sys/syscall.h>
#include "AvailabilityMacros.h" // For MAC_OS_X_VERSION_MAX_ALLOWED
#endif
#if defined(__linux__)
#include <linux/unistd.h>
#endif
namespace art {
using android::base::ReadFileToString;
using android::base::StringAppendF;
using android::base::StringPrintf;
pid_t GetTid() {
#if defined(__APPLE__)
uint64_t owner;
CHECK_PTHREAD_CALL(pthread_threadid_np, (nullptr, &owner), __FUNCTION__); // Requires Mac OS 10.6
return owner;
#elif defined(__BIONIC__)
return gettid();
#else
return syscall(__NR_gettid);
#endif
}
std::string GetThreadName(pid_t tid) {
std::string result;
// TODO: make this less Linux-specific.
if (ReadFileToString(StringPrintf("/proc/self/task/%d/comm", tid), &result)) {
result.resize(result.size() - 1); // Lose the trailing '\n'.
} else {
result = "<unknown>";
}
return result;
}
std::string PrettySize(int64_t byte_count) {
// The byte thresholds at which we display amounts. A byte count is displayed
// in unit U when kUnitThresholds[U] <= bytes < kUnitThresholds[U+1].
static const int64_t kUnitThresholds[] = {
0, // B up to...
3*1024, // KB up to...
2*1024*1024, // MB up to...
1024*1024*1024 // GB from here.
};
static const int64_t kBytesPerUnit[] = { 1, KB, MB, GB };
static const char* const kUnitStrings[] = { "B", "KB", "MB", "GB" };
const char* negative_str = "";
if (byte_count < 0) {
negative_str = "-";
byte_count = -byte_count;
}
int i = arraysize(kUnitThresholds);
while (--i > 0) {
if (byte_count >= kUnitThresholds[i]) {
break;
}
}
return StringPrintf("%s%" PRId64 "%s",
negative_str, byte_count / kBytesPerUnit[i], kUnitStrings[i]);
}
void Split(const std::string& s, char separator, std::vector<std::string>* result) {
const char* p = s.data();
const char* end = p + s.size();
while (p != end) {
if (*p == separator) {
++p;
} else {
const char* start = p;
while (++p != end && *p != separator) {
// Skip to the next occurrence of the separator.
}
result->push_back(std::string(start, p - start));
}
}
}
void SetThreadName(const char* thread_name) {
int hasAt = 0;
int hasDot = 0;
const char* s = thread_name;
while (*s) {
if (*s == '.') {
hasDot = 1;
} else if (*s == '@') {
hasAt = 1;
}
s++;
}
int len = s - thread_name;
if (len < 15 || hasAt || !hasDot) {
s = thread_name;
} else {
s = thread_name + len - 15;
}
#if defined(__linux__)
// pthread_setname_np fails rather than truncating long strings.
char buf[16]; // MAX_TASK_COMM_LEN=16 is hard-coded in the kernel.
strncpy(buf, s, sizeof(buf)-1);
buf[sizeof(buf)-1] = '\0';
errno = pthread_setname_np(pthread_self(), buf);
if (errno != 0) {
PLOG(WARNING) << "Unable to set the name of current thread to '" << buf << "'";
}
#else // __APPLE__
pthread_setname_np(thread_name);
#endif
}
void GetTaskStats(pid_t tid, char* state, int* utime, int* stime, int* task_cpu) {
*utime = *stime = *task_cpu = 0;
std::string stats;
// TODO: make this less Linux-specific.
if (!ReadFileToString(StringPrintf("/proc/self/task/%d/stat", tid), &stats)) {
return;
}
// Skip the command, which may contain spaces.
stats = stats.substr(stats.find(')') + 2);
// Extract the three fields we care about.
std::vector<std::string> fields;
Split(stats, ' ', &fields);
*state = fields[0][0];
*utime = strtoull(fields[11].c_str(), nullptr, 10);
*stime = strtoull(fields[12].c_str(), nullptr, 10);
*task_cpu = strtoull(fields[36].c_str(), nullptr, 10);
}
static void ParseStringAfterChar(const std::string& s,
char c,
std::string* parsed_value,
UsageFn Usage) {
std::string::size_type colon = s.find(c);
if (colon == std::string::npos) {
Usage("Missing char %c in option %s\n", c, s.c_str());
}
// Add one to remove the char we were trimming until.
*parsed_value = s.substr(colon + 1);
}
void ParseDouble(const std::string& option,
char after_char,
double min,
double max,
double* parsed_value,
UsageFn Usage) {
std::string substring;
ParseStringAfterChar(option, after_char, &substring, Usage);
bool sane_val = true;
double value;
if ((false)) {
// TODO: this doesn't seem to work on the emulator. b/15114595
std::stringstream iss(substring);
iss >> value;
// Ensure that we have a value, there was no cruft after it and it satisfies a sensible range.
sane_val = iss.eof() && (value >= min) && (value <= max);
} else {
char* end = nullptr;
value = strtod(substring.c_str(), &end);
sane_val = *end == '\0' && value >= min && value <= max;
}
if (!sane_val) {
Usage("Invalid double value %s for option %s\n", substring.c_str(), option.c_str());
}
*parsed_value = value;
}
void SleepForever() {
while (true) {
usleep(1000000);
}
}
} // namespace art
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