/*
* Copyright (C) 2013-2014 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 <ctype.h>
#include <dirent.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <android-base/file.h>
#include <gtest/gtest.h>
#include <log/log.h>
#include <log/log_event_list.h>
#ifndef logcat_popen
#define logcat_define(context)
#define logcat_popen(context, command) popen((command), "r")
#define logcat_pclose(context, fp) pclose(fp)
#define logcat_system(command) system(command)
#endif
#ifndef logcat_executable
#define USING_LOGCAT_EXECUTABLE_DEFAULT
#define logcat_executable "logcat"
#endif
#define BIG_BUFFER (5 * 1024)
// enhanced version of LOG_FAILURE_RETRY to add support for EAGAIN and
// non-syscall libs. Since we are only using this in the emergency of
// a signal to stuff a terminating code into the logs, we will spin rather
// than try a usleep.
#define LOG_FAILURE_RETRY(exp) \
({ \
typeof(exp) _rc; \
do { \
_rc = (exp); \
} while (((_rc == -1) && ((errno == EINTR) || (errno == EAGAIN))) || \
(_rc == -EINTR) || (_rc == -EAGAIN)); \
_rc; \
})
static const char begin[] = "--------- beginning of ";
TEST(logcat, buckets) {
FILE* fp;
logcat_define(ctx);
#undef LOG_TAG
#define LOG_TAG "inject"
RLOGE(logcat_executable ".buckets");
sleep(1);
ASSERT_TRUE(NULL !=
(fp = logcat_popen(
ctx, logcat_executable
" -b radio -b events -b system -b main -d 2>/dev/null")));
char buffer[BIG_BUFFER];
int ids = 0;
int count = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
if (!strncmp(begin, buffer, sizeof(begin) - 1)) {
while (char* cp = strrchr(buffer, '\n')) {
*cp = '\0';
}
log_id_t id = android_name_to_log_id(buffer + sizeof(begin) - 1);
ids |= 1 << id;
++count;
}
}
logcat_pclose(ctx, fp);
EXPECT_EQ(15, ids);
EXPECT_EQ(4, count);
}
TEST(logcat, event_tag_filter) {
FILE* fp;
logcat_define(ctx);
ASSERT_TRUE(NULL !=
(fp = logcat_popen(ctx, logcat_executable
" -b events -d -s auditd "
"am_proc_start am_pss am_proc_bound "
"dvm_lock_sample am_wtf 2>/dev/null")));
char buffer[BIG_BUFFER];
int count = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
++count;
}
logcat_pclose(ctx, fp);
EXPECT_LT(4, count);
}
// If there is not enough background noise in the logs, then spam the logs to
// permit tail checking so that the tests can progress.
static size_t inject(ssize_t count) {
if (count <= 0) return 0;
static const size_t retry = 4;
size_t errors = retry;
size_t num = 0;
for (;;) {
log_time ts(CLOCK_MONOTONIC);
if (__android_log_btwrite(0, EVENT_TYPE_LONG, &ts, sizeof(ts)) >= 0) {
if (++num >= (size_t)count) {
// let data settle end-to-end
sleep(3);
return num;
}
errors = retry;
usleep(100); // ~32 per timer tick, we are a spammer regardless
} else if (--errors <= 0) {
return num;
}
}
// NOTREACH
return num;
}
TEST(logcat, year) {
if (android_log_clockid() == CLOCK_MONOTONIC) {
fprintf(stderr, "Skipping test, logd is monotonic time\n");
return;
}
int count;
int tries = 3; // in case run too soon after system start or buffer clear
do {
FILE* fp;
logcat_define(ctx);
char needle[32];
time_t now;
time(&now);
struct tm* ptm;
#if !defined(_WIN32)
struct tm tmBuf;
ptm = localtime_r(&now, &tmBuf);
#else
ptm = localtime(&&now);
#endif
strftime(needle, sizeof(needle), "[ %Y-", ptm);
ASSERT_TRUE(NULL != (fp = logcat_popen(
ctx, logcat_executable
" -v long -v year -b all -t 3 2>/dev/null")));
char buffer[BIG_BUFFER];
count = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
if (!strncmp(buffer, needle, strlen(needle))) {
++count;
}
}
logcat_pclose(ctx, fp);
} while ((count < 3) && --tries && inject(3 - count));
ASSERT_EQ(3, count);
}
// Return a pointer to each null terminated -v long time field.
static char* fgetLongTime(char* buffer, size_t buflen, FILE* fp) {
while (fgets(buffer, buflen, fp)) {
char* cp = buffer;
if (*cp != '[') {
continue;
}
while (*++cp == ' ') {
;
}
char* ep = cp;
while (isdigit(*ep)) {
++ep;
}
if ((*ep != '-') && (*ep != '.')) {
continue;
}
// Find PID field. Look for ': ' or ':[0-9][0-9][0-9]'
while (((ep = strchr(ep, ':'))) && (*++ep != ' ')) {
if (isdigit(ep[0]) && isdigit(ep[1]) && isdigit(ep[2])) break;
}
if (!ep) {
continue;
}
static const size_t pid_field_width = 7;
ep -= pid_field_width;
*ep = '\0';
return cp;
}
return NULL;
}
TEST(logcat, tz) {
if (android_log_clockid() == CLOCK_MONOTONIC) {
fprintf(stderr, "Skipping test, logd is monotonic time\n");
return;
}
int tries = 4; // in case run too soon after system start or buffer clear
int count;
do {
FILE* fp;
logcat_define(ctx);
ASSERT_TRUE(NULL !=
(fp = logcat_popen(ctx, logcat_executable
" -v long -v America/Los_Angeles "
"-b all -t 3 2>/dev/null")));
char buffer[BIG_BUFFER];
count = 0;
while (fgetLongTime(buffer, sizeof(buffer), fp)) {
if (strstr(buffer, " -0700") || strstr(buffer, " -0800")) {
++count;
} else {
fprintf(stderr, "ts=\"%s\"\n", buffer + 2);
}
}
logcat_pclose(ctx, fp);
} while ((count < 3) && --tries && inject(3 - count));
ASSERT_EQ(3, count);
}
TEST(logcat, ntz) {
FILE* fp;
logcat_define(ctx);
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, logcat_executable
" -v long -v America/Los_Angeles -v "
"zone -b all -t 3 2>/dev/null")));
char buffer[BIG_BUFFER];
int count = 0;
while (fgetLongTime(buffer, sizeof(buffer), fp)) {
if (strstr(buffer, " -0700") || strstr(buffer, " -0800")) {
++count;
}
}
logcat_pclose(ctx, fp);
ASSERT_EQ(0, count);
}
static void do_tail(int num) {
int tries = 4; // in case run too soon after system start or buffer clear
int count;
if (num > 10) ++tries;
if (num > 100) ++tries;
do {
char buffer[BIG_BUFFER];
snprintf(buffer, sizeof(buffer),
"ANDROID_PRINTF_LOG=long logcat -b all -t %d 2>/dev/null", num);
FILE* fp;
logcat_define(ctx);
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
count = 0;
while (fgetLongTime(buffer, sizeof(buffer), fp)) {
++count;
}
logcat_pclose(ctx, fp);
} while ((count < num) && --tries && inject(num - count));
ASSERT_EQ(num, count);
}
TEST(logcat, tail_3) {
do_tail(3);
}
TEST(logcat, tail_10) {
do_tail(10);
}
TEST(logcat, tail_100) {
do_tail(100);
}
TEST(logcat, tail_1000) {
do_tail(1000);
}
static void do_tail_time(const char* cmd) {
FILE* fp;
int count;
char buffer[BIG_BUFFER];
char* last_timestamp = NULL;
// Hard to predict 100% if first (overlap) or second line will match.
// -v nsec will in a substantial majority be the second line.
char* first_timestamp = NULL;
char* second_timestamp = NULL;
char* input;
int tries = 4; // in case run too soon after system start or buffer clear
do {
snprintf(buffer, sizeof(buffer), "%s -t 10 2>&1", cmd);
logcat_define(ctx);
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
count = 0;
while ((input = fgetLongTime(buffer, sizeof(buffer), fp))) {
++count;
if (!first_timestamp) {
first_timestamp = strdup(input);
} else if (!second_timestamp) {
second_timestamp = strdup(input);
}
free(last_timestamp);
last_timestamp = strdup(input);
}
logcat_pclose(ctx, fp);
} while ((count < 10) && --tries && inject(10 - count));
EXPECT_EQ(10, count); // We want _some_ history, too small, falses below
EXPECT_TRUE(last_timestamp != NULL);
EXPECT_TRUE(first_timestamp != NULL);
EXPECT_TRUE(second_timestamp != NULL);
snprintf(buffer, sizeof(buffer), "%s -t '%s' 2>&1", cmd, first_timestamp);
logcat_define(ctx);
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
int second_count = 0;
int last_timestamp_count = -1;
--count; // One less unless we match the first_timestamp
bool found = false;
while ((input = fgetLongTime(buffer, sizeof(buffer), fp))) {
++second_count;
// We want to highlight if we skip to the next entry.
// WAI, if the time in logd is *exactly*
// XX-XX XX:XX:XX.XXXXXX000 (usec) or XX-XX XX:XX:XX.XXX000000
// this can happen, but it should not happen with nsec.
// We can make this WAI behavior happen 1000 times less
// frequently if the caller does not use the -v usec flag,
// but always the second (always skip) if they use the
// (undocumented) -v nsec flag.
if (first_timestamp) {
found = !strcmp(input, first_timestamp);
if (found) {
++count;
GTEST_LOG_(INFO)
<< "input = first(" << first_timestamp << ")\n";
}
free(first_timestamp);
first_timestamp = NULL;
}
if (second_timestamp) {
found = found || !strcmp(input, second_timestamp);
if (!found) {
GTEST_LOG_(INFO) << "input(" << input << ") != second("
<< second_timestamp << ")\n";
}
free(second_timestamp);
second_timestamp = NULL;
}
if (!strcmp(input, last_timestamp)) {
last_timestamp_count = second_count;
}
}
logcat_pclose(ctx, fp);
EXPECT_TRUE(found);
if (!found) {
if (first_timestamp) {
GTEST_LOG_(INFO) << "first = " << first_timestamp << "\n";
}
if (second_timestamp) {
GTEST_LOG_(INFO) << "second = " << second_timestamp << "\n";
}
if (last_timestamp) {
GTEST_LOG_(INFO) << "last = " << last_timestamp << "\n";
}
}
free(last_timestamp);
last_timestamp = NULL;
free(first_timestamp);
free(second_timestamp);
EXPECT_TRUE(first_timestamp == NULL);
EXPECT_TRUE(second_timestamp == NULL);
EXPECT_LE(count, second_count);
EXPECT_LE(count, last_timestamp_count);
}
TEST(logcat, tail_time) {
do_tail_time(logcat_executable " -v long -v nsec -b all");
}
TEST(logcat, tail_time_epoch) {
do_tail_time(logcat_executable " -v long -v nsec -v epoch -b all");
}
TEST(logcat, End_to_End) {
pid_t pid = getpid();
log_time ts(CLOCK_MONOTONIC);
ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts, sizeof(ts)));
FILE* fp;
logcat_define(ctx);
ASSERT_TRUE(NULL !=
(fp = logcat_popen(ctx, logcat_executable
" -v brief -b events -t 100 2>/dev/null")));
char buffer[BIG_BUFFER];
int count = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
int p;
unsigned long long t;
if ((2 != sscanf(buffer, "I/[0] ( %d): %llu", &p, &t)) ||
(p != pid)) {
continue;
}
log_time tx((const char*)&t);
if (ts == tx) {
++count;
}
}
logcat_pclose(ctx, fp);
ASSERT_EQ(1, count);
}
TEST(logcat, End_to_End_multitude) {
pid_t pid = getpid();
log_time ts(CLOCK_MONOTONIC);
ASSERT_LT(0, __android_log_btwrite(0, EVENT_TYPE_LONG, &ts, sizeof(ts)));
FILE* fp[256]; // does this count as a multitude!
memset(fp, 0, sizeof(fp));
logcat_define(ctx[sizeof(fp) / sizeof(fp[0])]);
size_t num = 0;
do {
EXPECT_TRUE(NULL !=
(fp[num] = logcat_popen(ctx[num], logcat_executable
" -v brief -b events -t 100")));
if (!fp[num]) {
fprintf(stderr,
"WARNING: limiting to %zu simultaneous logcat operations\n",
num);
break;
}
} while (++num < sizeof(fp) / sizeof(fp[0]));
char buffer[BIG_BUFFER];
size_t count = 0;
for (size_t idx = 0; idx < sizeof(fp) / sizeof(fp[0]); ++idx) {
if (!fp[idx]) break;
while (fgets(buffer, sizeof(buffer), fp[idx])) {
int p;
unsigned long long t;
if ((2 != sscanf(buffer, "I/[0] ( %d): %llu", &p, &t)) ||
(p != pid)) {
continue;
}
log_time tx((const char*)&t);
if (ts == tx) {
++count;
}
}
logcat_pclose(ctx[idx], fp[idx]);
}
ASSERT_EQ(num, count);
}
static int get_groups(const char* cmd) {
FILE* fp;
logcat_define(ctx);
// NB: crash log only available in user space
EXPECT_TRUE(NULL != (fp = logcat_popen(ctx, cmd)));
if (fp == NULL) {
return 0;
}
char buffer[BIG_BUFFER];
int count = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
int size, consumed, max, payload;
char size_mult[3], consumed_mult[3];
long full_size, full_consumed;
size = consumed = max = payload = 0;
// NB: crash log can be very small, not hit a Kb of consumed space
// doubly lucky we are not including it.
if (6 != sscanf(buffer,
"%*s ring buffer is %d%2s (%d%2s consumed),"
" max entry is %db, max payload is %db",
&size, size_mult, &consumed, consumed_mult, &max,
&payload)) {
fprintf(stderr, "WARNING: Parse error: %s", buffer);
continue;
}
full_size = size;
switch (size_mult[0]) {
case 'G':
full_size *= 1024;
/* FALLTHRU */
case 'M':
full_size *= 1024;
/* FALLTHRU */
case 'K':
full_size *= 1024;
/* FALLTHRU */
case 'b':
break;
}
full_consumed = consumed;
switch (consumed_mult[0]) {
case 'G':
full_consumed *= 1024;
/* FALLTHRU */
case 'M':
full_consumed *= 1024;
/* FALLTHRU */
case 'K':
full_consumed *= 1024;
/* FALLTHRU */
case 'b':
break;
}
EXPECT_GT((full_size * 9) / 4, full_consumed);
EXPECT_GT(full_size, max);
EXPECT_GT(max, payload);
if ((((full_size * 9) / 4) >= full_consumed) && (full_size > max) &&
(max > payload)) {
++count;
}
}
logcat_pclose(ctx, fp);
return count;
}
TEST(logcat, get_size) {
ASSERT_EQ(4, get_groups(logcat_executable
" -v brief -b radio -b events -b system -b "
"main -g 2>/dev/null"));
}
// duplicate test for get_size, but use comma-separated list of buffers
TEST(logcat, multiple_buffer) {
ASSERT_EQ(
4, get_groups(logcat_executable
" -v brief -b radio,events,system,main -g 2>/dev/null"));
}
TEST(logcat, bad_buffer) {
ASSERT_EQ(0,
get_groups(
logcat_executable
" -v brief -b radio,events,bogo,system,main -g 2>/dev/null"));
}
#ifndef logcat
static void caught_blocking(int signum) {
unsigned long long v = 0xDEADBEEFA55A0000ULL;
v += getpid() & 0xFFFF;
if (signum == 0) ++v;
LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
}
TEST(logcat, blocking) {
FILE* fp;
unsigned long long v = 0xDEADBEEFA55F0000ULL;
pid_t pid = getpid();
v += pid & 0xFFFF;
LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
v &= 0xFFFFFFFFFFFAFFFFULL;
ASSERT_TRUE(
NULL !=
(fp = popen("( trap exit HUP QUIT INT PIPE KILL ; sleep 6; echo DONE )&"
" logcat -v brief -b events 2>&1",
"r")));
char buffer[BIG_BUFFER];
int count = 0;
int signals = 0;
signal(SIGALRM, caught_blocking);
alarm(2);
while (fgets(buffer, sizeof(buffer), fp)) {
if (!strncmp(buffer, "DONE", 4)) {
break;
}
++count;
int p;
unsigned long long l;
if ((2 != sscanf(buffer, "I/[0] ( %u): %lld", &p, &l)) || (p != pid)) {
continue;
}
if (l == v) {
++signals;
break;
}
}
alarm(0);
signal(SIGALRM, SIG_DFL);
// Generate SIGPIPE
fclose(fp);
caught_blocking(0);
pclose(fp);
EXPECT_LE(2, count);
EXPECT_EQ(1, signals);
}
static void caught_blocking_tail(int signum) {
unsigned long long v = 0xA55ADEADBEEF0000ULL;
v += getpid() & 0xFFFF;
if (signum == 0) ++v;
LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
}
TEST(logcat, blocking_tail) {
FILE* fp;
unsigned long long v = 0xA55FDEADBEEF0000ULL;
pid_t pid = getpid();
v += pid & 0xFFFF;
LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
v &= 0xFFFAFFFFFFFFFFFFULL;
ASSERT_TRUE(
NULL !=
(fp = popen("( trap exit HUP QUIT INT PIPE KILL ; sleep 6; echo DONE )&"
" logcat -v brief -b events -T 5 2>&1",
"r")));
char buffer[BIG_BUFFER];
int count = 0;
int signals = 0;
signal(SIGALRM, caught_blocking_tail);
alarm(2);
while (fgets(buffer, sizeof(buffer), fp)) {
if (!strncmp(buffer, "DONE", 4)) {
break;
}
++count;
int p;
unsigned long long l;
if ((2 != sscanf(buffer, "I/[0] ( %u): %lld", &p, &l)) || (p != pid)) {
continue;
}
if (l == v) {
if (count >= 5) {
++signals;
}
break;
}
}
alarm(0);
signal(SIGALRM, SIG_DFL);
// Generate SIGPIPE
fclose(fp);
caught_blocking_tail(0);
pclose(fp);
EXPECT_LE(2, count);
EXPECT_EQ(1, signals);
}
#endif
// meant to be handed to ASSERT_FALSE / EXPECT_FALSE to expand the message
static testing::AssertionResult IsFalse(int ret, const char* command) {
return ret ? (testing::AssertionSuccess()
<< "ret=" << ret << " command=\"" << command << "\"")
: testing::AssertionFailure();
}
TEST(logcat, logrotate) {
static const char form[] = "/data/local/tmp/logcat.logrotate.XXXXXX";
char buf[sizeof(form)];
ASSERT_TRUE(NULL != mkdtemp(strcpy(buf, form)));
static const char comm[] = logcat_executable
" -b radio -b events -b system -b main"
" -d -f %s/log.txt -n 7 -r 1";
char command[sizeof(buf) + sizeof(comm)];
snprintf(command, sizeof(command), comm, buf);
int ret;
EXPECT_FALSE(IsFalse(ret = logcat_system(command), command));
if (!ret) {
snprintf(command, sizeof(command), "ls -s %s 2>/dev/null", buf);
FILE* fp;
EXPECT_TRUE(NULL != (fp = popen(command, "r")));
if (fp) {
char buffer[BIG_BUFFER];
int count = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
static const char total[] = "total ";
int num;
char c;
if ((2 == sscanf(buffer, "%d log.tx%c", &num, &c)) &&
(num <= 40)) {
++count;
} else if (strncmp(buffer, total, sizeof(total) - 1)) {
fprintf(stderr, "WARNING: Parse error: %s", buffer);
}
}
pclose(fp);
if ((count != 7) && (count != 8)) {
fprintf(stderr, "count=%d\n", count);
}
EXPECT_TRUE(count == 7 || count == 8);
}
}
snprintf(command, sizeof(command), "rm -rf %s", buf);
EXPECT_FALSE(IsFalse(system(command), command));
}
TEST(logcat, logrotate_suffix) {
static const char tmp_out_dir_form[] =
"/data/local/tmp/logcat.logrotate.XXXXXX";
char tmp_out_dir[sizeof(tmp_out_dir_form)];
ASSERT_TRUE(NULL != mkdtemp(strcpy(tmp_out_dir, tmp_out_dir_form)));
static const char logcat_cmd[] = logcat_executable
" -b radio -b events -b system -b main"
" -d -f %s/log.txt -n 10 -r 1";
char command[sizeof(tmp_out_dir) + sizeof(logcat_cmd)];
snprintf(command, sizeof(command), logcat_cmd, tmp_out_dir);
int ret;
EXPECT_FALSE(IsFalse(ret = logcat_system(command), command));
if (!ret) {
snprintf(command, sizeof(command), "ls %s 2>/dev/null", tmp_out_dir);
FILE* fp;
EXPECT_TRUE(NULL != (fp = popen(command, "r")));
char buffer[BIG_BUFFER];
int log_file_count = 0;
while (fgets(buffer, sizeof(buffer), fp)) {
static const char rotated_log_filename_prefix[] = "log.txt.";
static const size_t rotated_log_filename_prefix_len =
strlen(rotated_log_filename_prefix);
static const char log_filename[] = "log.txt";
if (!strncmp(buffer, rotated_log_filename_prefix,
rotated_log_filename_prefix_len)) {
// Rotated file should have form log.txt.##
char* rotated_log_filename_suffix =
buffer + rotated_log_filename_prefix_len;
char* endptr;
const long int suffix_value =
strtol(rotated_log_filename_suffix, &endptr, 10);
EXPECT_EQ(rotated_log_filename_suffix + 2, endptr);
EXPECT_LE(suffix_value, 10);
EXPECT_GT(suffix_value, 0);
++log_file_count;
continue;
}
if (!strncmp(buffer, log_filename, strlen(log_filename))) {
++log_file_count;
continue;
}
fprintf(stderr, "ERROR: Unexpected file: %s", buffer);
ADD_FAILURE();
}
pclose(fp);
EXPECT_EQ(11, log_file_count);
}
snprintf(command, sizeof(command), "rm -rf %s", tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
}
TEST(logcat, logrotate_continue) {
static const char tmp_out_dir_form[] =
"/data/local/tmp/logcat.logrotate.XXXXXX";
char tmp_out_dir[sizeof(tmp_out_dir_form)];
ASSERT_TRUE(NULL != mkdtemp(strcpy(tmp_out_dir, tmp_out_dir_form)));
static const char log_filename[] = "log.txt";
static const char logcat_cmd[] =
logcat_executable " -b all -v nsec -d -f %s/%s -n 256 -r 1024";
static const char cleanup_cmd[] = "rm -rf %s";
char command[sizeof(tmp_out_dir) + sizeof(logcat_cmd) + sizeof(log_filename)];
snprintf(command, sizeof(command), logcat_cmd, tmp_out_dir, log_filename);
int ret;
EXPECT_FALSE(IsFalse(ret = logcat_system(command), command));
if (ret) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
return;
}
FILE* fp;
snprintf(command, sizeof(command), "%s/%s", tmp_out_dir, log_filename);
EXPECT_TRUE(NULL != ((fp = fopen(command, "r"))));
if (!fp) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
return;
}
char* line = NULL;
char* last_line =
NULL; // this line is allowed to stutter, one-line overlap
char* second_last_line = NULL; // should never stutter
char* first_line = NULL; // help diagnose failure?
size_t len = 0;
while (getline(&line, &len, fp) != -1) {
if (!first_line) {
first_line = line;
line = NULL;
continue;
}
free(second_last_line);
second_last_line = last_line;
last_line = line;
line = NULL;
}
fclose(fp);
free(line);
if (second_last_line == NULL) {
fprintf(stderr, "No second to last line, using last, test may fail\n");
second_last_line = last_line;
last_line = NULL;
}
free(last_line);
EXPECT_TRUE(NULL != second_last_line);
if (!second_last_line) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
free(first_line);
return;
}
// re-run the command, it should only add a few lines more content if it
// continues where it left off.
snprintf(command, sizeof(command), logcat_cmd, tmp_out_dir, log_filename);
EXPECT_FALSE(IsFalse(ret = logcat_system(command), command));
if (ret) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
free(second_last_line);
free(first_line);
return;
}
std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(tmp_out_dir),
closedir);
EXPECT_NE(nullptr, dir);
if (!dir) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
free(second_last_line);
free(first_line);
return;
}
struct dirent* entry;
unsigned count = 0;
while ((entry = readdir(dir.get()))) {
if (strncmp(entry->d_name, log_filename, sizeof(log_filename) - 1)) {
continue;
}
snprintf(command, sizeof(command), "%s/%s", tmp_out_dir, entry->d_name);
EXPECT_TRUE(NULL != ((fp = fopen(command, "r"))));
if (!fp) {
fprintf(stderr, "%s ?\n", command);
continue;
}
line = NULL;
size_t number = 0;
while (getline(&line, &len, fp) != -1) {
++number;
if (!strcmp(line, second_last_line)) {
EXPECT_TRUE(++count <= 1);
fprintf(stderr, "%s(%zu):\n", entry->d_name, number);
}
}
fclose(fp);
free(line);
unlink(command);
}
if (count > 1) {
char* brk = strpbrk(second_last_line, "\r\n");
if (!brk) brk = second_last_line + strlen(second_last_line);
fprintf(stderr, "\"%.*s\" occurred %u times\n",
(int)(brk - second_last_line), second_last_line, count);
if (first_line) {
brk = strpbrk(first_line, "\r\n");
if (!brk) brk = first_line + strlen(first_line);
fprintf(stderr, "\"%.*s\" was first line, fault?\n",
(int)(brk - first_line), first_line);
}
}
free(second_last_line);
free(first_line);
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
}
TEST(logcat, logrotate_clear) {
static const char tmp_out_dir_form[] =
"/data/local/tmp/logcat.logrotate.XXXXXX";
char tmp_out_dir[sizeof(tmp_out_dir_form)];
ASSERT_TRUE(NULL != mkdtemp(strcpy(tmp_out_dir, tmp_out_dir_form)));
static const char log_filename[] = "log.txt";
static const unsigned num_val = 32;
static const char logcat_cmd[] =
logcat_executable " -b all -d -f %s/%s -n %d -r 1";
static const char clear_cmd[] = " -c";
static const char cleanup_cmd[] = "rm -rf %s";
char command[sizeof(tmp_out_dir) + sizeof(logcat_cmd) +
sizeof(log_filename) + sizeof(clear_cmd) + 32];
// Run command with all data
{
snprintf(command, sizeof(command) - sizeof(clear_cmd), logcat_cmd,
tmp_out_dir, log_filename, num_val);
int ret;
EXPECT_FALSE(IsFalse(ret = logcat_system(command), command));
if (ret) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
return;
}
std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(tmp_out_dir),
closedir);
EXPECT_NE(nullptr, dir);
if (!dir) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
return;
}
struct dirent* entry;
unsigned count = 0;
while ((entry = readdir(dir.get()))) {
if (strncmp(entry->d_name, log_filename, sizeof(log_filename) - 1)) {
continue;
}
++count;
}
EXPECT_EQ(count, num_val + 1);
}
{
// Now with -c option tacked onto the end
strcat(command, clear_cmd);
int ret;
EXPECT_FALSE(IsFalse(ret = logcat_system(command), command));
if (ret) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(system(command));
EXPECT_FALSE(IsFalse(system(command), command));
return;
}
std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(tmp_out_dir),
closedir);
EXPECT_NE(nullptr, dir);
if (!dir) {
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
return;
}
struct dirent* entry;
unsigned count = 0;
while ((entry = readdir(dir.get()))) {
if (strncmp(entry->d_name, log_filename, sizeof(log_filename) - 1)) {
continue;
}
fprintf(stderr, "Found %s/%s!!!\n", tmp_out_dir, entry->d_name);
++count;
}
EXPECT_EQ(count, 0U);
}
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
}
static int logrotate_count_id(const char* logcat_cmd, const char* tmp_out_dir) {
static const char log_filename[] = "log.txt";
char command[strlen(tmp_out_dir) + strlen(logcat_cmd) +
strlen(log_filename) + 32];
snprintf(command, sizeof(command), logcat_cmd, tmp_out_dir, log_filename);
int ret = logcat_system(command);
if (ret) {
fprintf(stderr, "system(\"%s\")=%d", command, ret);
return -1;
}
std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(tmp_out_dir),
closedir);
if (!dir) {
fprintf(stderr, "opendir(\"%s\") failed", tmp_out_dir);
return -1;
}
struct dirent* entry;
int count = 0;
while ((entry = readdir(dir.get()))) {
if (strncmp(entry->d_name, log_filename, sizeof(log_filename) - 1)) {
continue;
}
++count;
}
return count;
}
TEST(logcat, logrotate_id) {
static const char logcat_cmd[] =
logcat_executable " -b all -d -f %s/%s -n 32 -r 1 --id=test";
static const char logcat_short_cmd[] =
logcat_executable " -b all -t 10 -f %s/%s -n 32 -r 1 --id=test";
static const char tmp_out_dir_form[] =
"/data/local/tmp/logcat.logrotate.XXXXXX";
static const char log_filename[] = "log.txt";
char tmp_out_dir[strlen(tmp_out_dir_form) + 1];
ASSERT_TRUE(NULL != mkdtemp(strcpy(tmp_out_dir, tmp_out_dir_form)));
EXPECT_EQ(34, logrotate_count_id(logcat_cmd, tmp_out_dir));
EXPECT_EQ(34, logrotate_count_id(logcat_short_cmd, tmp_out_dir));
char id_file[strlen(tmp_out_dir_form) + strlen(log_filename) + 5];
snprintf(id_file, sizeof(id_file), "%s/%s.id", tmp_out_dir, log_filename);
if (getuid() != 0) {
chmod(id_file, 0);
EXPECT_EQ(34, logrotate_count_id(logcat_short_cmd, tmp_out_dir));
}
unlink(id_file);
EXPECT_EQ(34, logrotate_count_id(logcat_short_cmd, tmp_out_dir));
FILE* fp = fopen(id_file, "w");
if (fp) {
fprintf(fp, "not_a_test");
fclose(fp);
}
if (getuid() != 0) {
chmod(id_file,
0); // API to preserve content even with signature change
ASSERT_EQ(34, logrotate_count_id(logcat_short_cmd, tmp_out_dir));
chmod(id_file, 0600);
}
int new_signature;
EXPECT_LE(
2, (new_signature = logrotate_count_id(logcat_short_cmd, tmp_out_dir)));
EXPECT_GT(34, new_signature);
static const char cleanup_cmd[] = "rm -rf %s";
char command[strlen(cleanup_cmd) + strlen(tmp_out_dir_form)];
snprintf(command, sizeof(command), cleanup_cmd, tmp_out_dir);
EXPECT_FALSE(IsFalse(system(command), command));
}
TEST(logcat, logrotate_nodir) {
// expect logcat to error out on writing content and not exit(0) for nodir
static const char command[] = logcat_executable
" -b all -d"
" -f /das/nein/gerfingerpoken/logcat/log.txt"
" -n 256 -r 1024";
EXPECT_FALSE(IsFalse(0 == logcat_system(command), command));
}
#ifndef logcat
static void caught_blocking_clear(int signum) {
unsigned long long v = 0xDEADBEEFA55C0000ULL;
v += getpid() & 0xFFFF;
if (signum == 0) ++v;
LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
}
TEST(logcat, blocking_clear) {
FILE* fp;
unsigned long long v = 0xDEADBEEFA55C0000ULL;
pid_t pid = getpid();
v += pid & 0xFFFF;
// This test is racey; an event occurs between clear and dump.
// We accept that we will get a false positive, but never a false negative.
ASSERT_TRUE(
NULL !=
(fp = popen("( trap exit HUP QUIT INT PIPE KILL ; sleep 6; echo DONE )&"
" logcat -b events -c 2>&1 ;"
" logcat -b events -g 2>&1 ;"
" logcat -v brief -b events 2>&1",
"r")));
char buffer[BIG_BUFFER];
int count = 0;
int minus_g = 0;
int signals = 0;
signal(SIGALRM, caught_blocking_clear);
alarm(2);
while (fgets(buffer, sizeof(buffer), fp)) {
if (!strncmp(buffer, "clearLog: ", 10)) {
fprintf(stderr, "WARNING: Test lacks permission to run :-(\n");
count = signals = 1;
break;
}
if (!strncmp(buffer, "DONE", 4)) {
break;
}
int size, consumed, max, payload;
char size_mult[3], consumed_mult[3];
size = consumed = max = payload = 0;
if (6 == sscanf(buffer,
"events: ring buffer is %d%2s (%d%2s consumed),"
" max entry is %db, max payload is %db",
&size, size_mult, &consumed, consumed_mult, &max,
&payload)) {
long full_size = size, full_consumed = consumed;
switch (size_mult[0]) {
case 'G':
full_size *= 1024;
/* FALLTHRU */
case 'M':
full_size *= 1024;
/* FALLTHRU */
case 'K':
full_size *= 1024;
/* FALLTHRU */
case 'b':
break;
}
switch (consumed_mult[0]) {
case 'G':
full_consumed *= 1024;
/* FALLTHRU */
case 'M':
full_consumed *= 1024;
/* FALLTHRU */
case 'K':
full_consumed *= 1024;
/* FALLTHRU */
case 'b':
break;
}
EXPECT_GT(full_size, full_consumed);
EXPECT_GT(full_size, max);
EXPECT_GT(max, payload);
EXPECT_GT(max, full_consumed);
++minus_g;
continue;
}
++count;
int p;
unsigned long long l;
if ((2 != sscanf(buffer, "I/[0] ( %u): %lld", &p, &l)) || (p != pid)) {
continue;
}
if (l == v) {
if (count > 1) {
fprintf(stderr, "WARNING: Possible false positive\n");
}
++signals;
break;
}
}
alarm(0);
signal(SIGALRM, SIG_DFL);
// Generate SIGPIPE
fclose(fp);
caught_blocking_clear(0);
pclose(fp);
EXPECT_LE(1, count);
EXPECT_EQ(1, minus_g);
EXPECT_EQ(1, signals);
}
#endif
static bool get_white_black(char** list) {
FILE* fp;
logcat_define(ctx);
fp = logcat_popen(ctx, logcat_executable " -p 2>/dev/null");
if (fp == NULL) {
fprintf(stderr, "ERROR: logcat -p 2>/dev/null\n");
return false;
}
char buffer[BIG_BUFFER];
while (fgets(buffer, sizeof(buffer), fp)) {
char* hold = *list;
char* buf = buffer;
while (isspace(*buf)) {
++buf;
}
char* end = buf + strlen(buf);
while (isspace(*--end) && (end >= buf)) {
*end = '\0';
}
if (end < buf) {
continue;
}
if (hold) {
asprintf(list, "%s %s", hold, buf);
free(hold);
} else {
asprintf(list, "%s", buf);
}
}
logcat_pclose(ctx, fp);
return *list != NULL;
}
static bool set_white_black(const char* list) {
FILE* fp;
logcat_define(ctx);
char buffer[BIG_BUFFER];
snprintf(buffer, sizeof(buffer), logcat_executable " -P '%s' 2>&1",
list ? list : "");
fp = logcat_popen(ctx, buffer);
if (fp == NULL) {
fprintf(stderr, "ERROR: %s\n", buffer);
return false;
}
while (fgets(buffer, sizeof(buffer), fp)) {
char* buf = buffer;
while (isspace(*buf)) {
++buf;
}
char* end = buf + strlen(buf);
while ((end > buf) && isspace(*--end)) {
*end = '\0';
}
if (end <= buf) {
continue;
}
fprintf(stderr, "%s\n", buf);
logcat_pclose(ctx, fp);
return false;
}
return logcat_pclose(ctx, fp) == 0;
}
TEST(logcat, white_black_adjust) {
char* list = NULL;
char* adjust = NULL;
get_white_black(&list);
static const char adjustment[] = "~! 300/20 300/25 2000 ~1000/5 ~1000/30";
ASSERT_EQ(true, set_white_black(adjustment));
ASSERT_EQ(true, get_white_black(&adjust));
EXPECT_STREQ(adjustment, adjust);
free(adjust);
adjust = NULL;
static const char adjustment2[] = "300/20 300/21 2000 ~1000";
ASSERT_EQ(true, set_white_black(adjustment2));
ASSERT_EQ(true, get_white_black(&adjust));
EXPECT_STREQ(adjustment2, adjust);
free(adjust);
adjust = NULL;
ASSERT_EQ(true, set_white_black(list));
get_white_black(&adjust);
EXPECT_STREQ(list ? list : "", adjust ? adjust : "");
free(adjust);
adjust = NULL;
free(list);
list = NULL;
}
TEST(logcat, regex) {
FILE* fp;
logcat_define(ctx);
int count = 0;
char buffer[BIG_BUFFER];
#define logcat_regex_prefix ___STRING(logcat) "_test"
snprintf(buffer, sizeof(buffer),
logcat_executable " --pid %d -d -e " logcat_regex_prefix "_a+b",
getpid());
LOG_FAILURE_RETRY(__android_log_print(ANDROID_LOG_WARN, logcat_regex_prefix,
logcat_regex_prefix "_ab"));
LOG_FAILURE_RETRY(__android_log_print(ANDROID_LOG_WARN, logcat_regex_prefix,
logcat_regex_prefix "_b"));
LOG_FAILURE_RETRY(__android_log_print(ANDROID_LOG_WARN, logcat_regex_prefix,
logcat_regex_prefix "_aaaab"));
LOG_FAILURE_RETRY(__android_log_print(ANDROID_LOG_WARN, logcat_regex_prefix,
logcat_regex_prefix "_aaaa"));
// Let the logs settle
sleep(1);
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
while (fgets(buffer, sizeof(buffer), fp)) {
if (!strncmp(begin, buffer, sizeof(begin) - 1)) {
continue;
}
EXPECT_TRUE(strstr(buffer, logcat_regex_prefix "_") != NULL);
count++;
}
logcat_pclose(ctx, fp);
ASSERT_EQ(2, count);
}
TEST(logcat, maxcount) {
FILE* fp;
logcat_define(ctx);
int count = 0;
char buffer[BIG_BUFFER];
snprintf(buffer, sizeof(buffer),
logcat_executable " --pid %d -d --max-count 3", getpid());
LOG_FAILURE_RETRY(
__android_log_print(ANDROID_LOG_WARN, "logcat_test", "logcat_test"));
LOG_FAILURE_RETRY(
__android_log_print(ANDROID_LOG_WARN, "logcat_test", "logcat_test"));
LOG_FAILURE_RETRY(
__android_log_print(ANDROID_LOG_WARN, "logcat_test", "logcat_test"));
LOG_FAILURE_RETRY(
__android_log_print(ANDROID_LOG_WARN, "logcat_test", "logcat_test"));
// Let the logs settle
sleep(1);
ASSERT_TRUE(NULL != (fp = logcat_popen(ctx, buffer)));
while (fgets(buffer, sizeof(buffer), fp)) {
if (!strncmp(begin, buffer, sizeof(begin) - 1)) {
continue;
}
count++;
}
logcat_pclose(ctx, fp);
ASSERT_EQ(3, count);
}
static bool End_to_End(const char* tag, const char* fmt, ...)
#if defined(__GNUC__)
__attribute__((__format__(printf, 2, 3)))
#endif
;
static bool End_to_End(const char* tag, const char* fmt, ...) {
logcat_define(ctx);
FILE* fp = logcat_popen(ctx,
"logcat"
" -v brief"
" -b events"
" -v descriptive"
" -t 100"
" 2>/dev/null");
if (!fp) {
fprintf(stderr, "End_to_End: popen failed");
return false;
}
char buffer[BIG_BUFFER];
va_list ap;
va_start(ap, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, ap);
va_end(ap);
char* str = NULL;
asprintf(&str, "I/%s ( %%d):%%c%s%%c", tag, buffer);
std::string expect(str);
free(str);
int count = 0;
pid_t pid = getpid();
std::string lastMatch;
int maxMatch = 1;
while (fgets(buffer, sizeof(buffer), fp)) {
char space;
char newline;
int p;
int ret = sscanf(buffer, expect.c_str(), &p, &space, &newline);
if ((ret == 3) && (p == pid) && (space == ' ') && (newline == '\n')) {
++count;
} else if ((ret >= maxMatch) && (p == pid) && (count == 0)) {
lastMatch = buffer;
maxMatch = ret;
}
}
logcat_pclose(ctx, fp);
if ((count == 0) && (lastMatch.length() > 0)) {
// Help us pinpoint where things went wrong ...
fprintf(stderr, "Closest match for\n %s\n is\n %s",
expect.c_str(), lastMatch.c_str());
} else if (count > 2) {
fprintf(stderr, "Too many matches (%d) for %s\n", count, expect.c_str());
}
// Expect one the first time around as either liblogcat.descriptive or
// logcat.descriptive. Expect two the second time as the other.
return count == 1 || count == 2;
}
TEST(logcat, descriptive) {
struct tag {
uint32_t tagNo;
const char* tagStr;
};
{
static const struct tag hhgtg = { 42, "answer" };
android_log_event_list ctx(hhgtg.tagNo);
static const char theAnswer[] = "what is five by seven";
ctx << theAnswer;
ctx.write();
EXPECT_TRUE(
End_to_End(hhgtg.tagStr, "to life the universe etc=%s", theAnswer));
}
{
static const struct tag sync = { 2720, "sync" };
static const char id[] = "logcat.decriptive";
{
android_log_event_list ctx(sync.tagNo);
ctx << id << (int32_t)42 << (int32_t)-1 << (int32_t)0;
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr,
"[id=%s,event=42,source=-1,account=0]", id));
}
// Partial match to description
{
android_log_event_list ctx(sync.tagNo);
ctx << id << (int32_t)43 << (int64_t)-1 << (int32_t)0;
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, "[id=%s,event=43,-1,0]", id));
}
// Negative Test of End_to_End, ensure it is working
{
android_log_event_list ctx(sync.tagNo);
ctx << id << (int32_t)44 << (int32_t)-1 << (int64_t)0;
ctx.write();
fprintf(stderr, "Expect a \"Closest match\" message\n");
EXPECT_FALSE(End_to_End(
sync.tagStr, "[id=%s,event=44,source=-1,account=0]", id));
}
}
{
static const struct tag sync = { 2747, "contacts_aggregation" };
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint64_t)30 << (int32_t)2;
ctx.write();
EXPECT_TRUE(
End_to_End(sync.tagStr, "[aggregation time=30ms,count=2]"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint64_t)31570 << (int32_t)911;
ctx.write();
EXPECT_TRUE(
End_to_End(sync.tagStr, "[aggregation time=31.57s,count=911]"));
}
}
{
static const struct tag sync = { 75000, "sqlite_mem_alarm_current" };
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)512;
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, "current=512B"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)3072;
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, "current=3KB"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)2097152;
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, "current=2MB"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)2097153;
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, "current=2097153B"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)1073741824;
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, "current=1GB"));
}
{
android_log_event_list ctx(sync.tagNo);
ctx << (uint32_t)3221225472; // 3MB, but on purpose overflowed
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, "current=-1GB"));
}
}
{
static const struct tag sync = { 27501, "notification_panel_hidden" };
android_log_event_list ctx(sync.tagNo);
ctx.write();
EXPECT_TRUE(End_to_End(sync.tagStr, ""));
}
}
static bool reportedSecurity(const char* command) {
logcat_define(ctx);
FILE* fp = logcat_popen(ctx, command);
if (!fp) return true;
std::string ret;
bool val = android::base::ReadFdToString(fileno(fp), &ret);
logcat_pclose(ctx, fp);
if (!val) return true;
return std::string::npos != ret.find("'security'");
}
TEST(logcat, security) {
EXPECT_FALSE(reportedSecurity(logcat_executable " -b all -g 2>&1"));
EXPECT_TRUE(reportedSecurity(logcat_executable " -b security -g 2>&1"));
EXPECT_TRUE(reportedSecurity(logcat_executable " -b security -c 2>&1"));
EXPECT_TRUE(
reportedSecurity(logcat_executable " -b security -G 256K 2>&1"));
}
static size_t commandOutputSize(const char* command) {
logcat_define(ctx);
FILE* fp = logcat_popen(ctx, command);
if (!fp) return 0;
std::string ret;
if (!android::base::ReadFdToString(fileno(fp), &ret)) return 0;
if (logcat_pclose(ctx, fp) != 0) return 0;
return ret.size();
}
TEST(logcat, help) {
size_t logcatHelpTextSize = commandOutputSize(logcat_executable " -h 2>&1");
EXPECT_LT(4096UL, logcatHelpTextSize);
size_t logcatLastHelpTextSize =
commandOutputSize(logcat_executable " -L -h 2>&1");
#ifdef USING_LOGCAT_EXECUTABLE_DEFAULT // logcat and liblogcat
EXPECT_EQ(logcatHelpTextSize, logcatLastHelpTextSize);
#else
// logcatd -L -h prints the help twice, as designed.
EXPECT_EQ(logcatHelpTextSize * 2, logcatLastHelpTextSize);
#endif
}