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platform_system_core/logcat/logcat.cpp
Mark Salyzyn 7545b471a2 logcat: allow comma-separate list of buffers 
(cherry pick from commit 4517773296)

- Add parsing to support comma+ separated list of buffers.
- Move get_size test into a standalone get_groups function
- add some additional tests for this feature, leveraging
  get_groups to confirm buffer selection.

Bug: 28120456
Bug: 28788401
Bug: 28813587
Change-Id: I0b42736c08cf4b2a435cb74cda540dc163a26bd1
2016-07-19 11:13:14 -07:00

1245 lines
41 KiB
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// Copyright 2006-2015 The Android Open Source Project
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <math.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <android-base/file.h>
#include <android-base/strings.h>
#include <cutils/sched_policy.h>
#include <cutils/sockets.h>
#include <log/event_tag_map.h>
#include <log/log.h>
#include <log/log_read.h>
#include <log/logd.h>
#include <log/logger.h>
#include <log/logprint.h>
#include <utils/threads.h>
#include <pcrecpp.h>
#define DEFAULT_MAX_ROTATED_LOGS 4
static AndroidLogFormat * g_logformat;
/* logd prefixes records with a length field */
#define RECORD_LENGTH_FIELD_SIZE_BYTES sizeof(uint32_t)
struct log_device_t {
const char* device;
bool binary;
struct logger *logger;
struct logger_list *logger_list;
bool printed;
log_device_t* next;
log_device_t(const char* d, bool b) {
device = d;
binary = b;
next = NULL;
printed = false;
logger = NULL;
logger_list = NULL;
}
};
namespace android {
/* Global Variables */
static const char * g_outputFileName;
// 0 means "no log rotation"
static size_t g_logRotateSizeKBytes;
// 0 means "unbounded"
static size_t g_maxRotatedLogs = DEFAULT_MAX_ROTATED_LOGS;
static int g_outFD = -1;
static size_t g_outByteCount;
static int g_printBinary;
static int g_devCount; // >1 means multiple
static pcrecpp::RE* g_regex;
// 0 means "infinite"
static size_t g_maxCount;
static size_t g_printCount;
static bool g_printItAnyways;
// if showHelp is set, newline required in fmt statement to transition to usage
__noreturn static void logcat_panic(bool showHelp, const char *fmt, ...) __printflike(2,3);
static int openLogFile (const char *pathname)
{
return open(pathname, O_WRONLY | O_APPEND | O_CREAT, S_IRUSR | S_IWUSR);
}
static void rotateLogs()
{
int err;
// Can't rotate logs if we're not outputting to a file
if (g_outputFileName == NULL) {
return;
}
close(g_outFD);
// Compute the maximum number of digits needed to count up to g_maxRotatedLogs in decimal.
// eg: g_maxRotatedLogs == 30 -> log10(30) == 1.477 -> maxRotationCountDigits == 2
int maxRotationCountDigits =
(g_maxRotatedLogs > 0) ? (int) (floor(log10(g_maxRotatedLogs) + 1)) : 0;
for (int i = g_maxRotatedLogs ; i > 0 ; i--) {
char *file0, *file1;
asprintf(&file1, "%s.%.*d", g_outputFileName, maxRotationCountDigits, i);
if (i - 1 == 0) {
asprintf(&file0, "%s", g_outputFileName);
} else {
asprintf(&file0, "%s.%.*d", g_outputFileName, maxRotationCountDigits, i - 1);
}
if (!file0 || !file1) {
perror("while rotating log files");
break;
}
err = rename(file0, file1);
if (err < 0 && errno != ENOENT) {
perror("while rotating log files");
}
free(file1);
free(file0);
}
g_outFD = openLogFile(g_outputFileName);
if (g_outFD < 0) {
logcat_panic(false, "couldn't open output file");
}
g_outByteCount = 0;
}
void printBinary(struct log_msg *buf)
{
size_t size = buf->len();
TEMP_FAILURE_RETRY(write(g_outFD, buf, size));
}
static bool regexOk(const AndroidLogEntry& entry)
{
if (!g_regex) {
return true;
}
std::string messageString(entry.message, entry.messageLen);
return g_regex->PartialMatch(messageString);
}
static void processBuffer(log_device_t* dev, struct log_msg *buf)
{
int bytesWritten = 0;
int err;
AndroidLogEntry entry;
char binaryMsgBuf[1024];
if (dev->binary) {
static bool hasOpenedEventTagMap = false;
static EventTagMap *eventTagMap = NULL;
if (!eventTagMap && !hasOpenedEventTagMap) {
eventTagMap = android_openEventTagMap(EVENT_TAG_MAP_FILE);
hasOpenedEventTagMap = true;
}
err = android_log_processBinaryLogBuffer(&buf->entry_v1, &entry,
eventTagMap,
binaryMsgBuf,
sizeof(binaryMsgBuf));
//printf(">>> pri=%d len=%d msg='%s'\n",
// entry.priority, entry.messageLen, entry.message);
} else {
err = android_log_processLogBuffer(&buf->entry_v1, &entry);
}
if (err < 0) {
goto error;
}
if (android_log_shouldPrintLine(g_logformat, entry.tag, entry.priority)) {
bool match = regexOk(entry);
g_printCount += match;
if (match || g_printItAnyways) {
bytesWritten = android_log_printLogLine(g_logformat, g_outFD, &entry);
if (bytesWritten < 0) {
logcat_panic(false, "output error");
}
}
}
g_outByteCount += bytesWritten;
if (g_logRotateSizeKBytes > 0
&& (g_outByteCount / 1024) >= g_logRotateSizeKBytes
) {
rotateLogs();
}
error:
//fprintf (stderr, "Error processing record\n");
return;
}
static void maybePrintStart(log_device_t* dev, bool printDividers) {
if (!dev->printed || printDividers) {
if (g_devCount > 1 && !g_printBinary) {
char buf[1024];
snprintf(buf, sizeof(buf), "--------- %s %s\n",
dev->printed ? "switch to" : "beginning of",
dev->device);
if (write(g_outFD, buf, strlen(buf)) < 0) {
logcat_panic(false, "output error");
}
}
dev->printed = true;
}
}
static void setupOutput()
{
if (g_outputFileName == NULL) {
g_outFD = STDOUT_FILENO;
} else {
if (set_sched_policy(0, SP_BACKGROUND) < 0) {
fprintf(stderr, "failed to set background scheduling policy\n");
}
struct sched_param param;
memset(&param, 0, sizeof(param));
if (sched_setscheduler((pid_t) 0, SCHED_BATCH, &param) < 0) {
fprintf(stderr, "failed to set to batch scheduler\n");
}
if (setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_BACKGROUND) < 0) {
fprintf(stderr, "failed set to priority\n");
}
g_outFD = openLogFile (g_outputFileName);
if (g_outFD < 0) {
logcat_panic(false, "couldn't open output file");
}
struct stat statbuf;
if (fstat(g_outFD, &statbuf) == -1) {
close(g_outFD);
logcat_panic(false, "couldn't get output file stat\n");
}
if ((size_t) statbuf.st_size > SIZE_MAX || statbuf.st_size < 0) {
close(g_outFD);
logcat_panic(false, "invalid output file stat\n");
}
g_outByteCount = statbuf.st_size;
}
}
static void show_help(const char *cmd)
{
fprintf(stderr,"Usage: %s [options] [filterspecs]\n", cmd);
fprintf(stderr, "options include:\n"
" -s Set default filter to silent. Equivalent to filterspec '*:S'\n"
" -f <file>, --file=<file> Log to file. Default is stdout\n"
" -r <kbytes>, --rotate-kbytes=<kbytes>\n"
" Rotate log every kbytes. Requires -f option\n"
" -n <count>, --rotate-count=<count>\n"
" Sets max number of rotated logs to <count>, default 4\n"
" -v <format>, --format=<format>\n"
" Sets the log print format, where <format> is:\n"
" brief color epoch long monotonic printable process raw\n"
" tag thread threadtime time uid usec UTC year zone\n"
" -D, --dividers Print dividers between each log buffer\n"
" -c, --clear Clear (flush) the entire log and exit\n"
" if Log to File specified, clear fileset instead\n"
" -d Dump the log and then exit (don't block)\n"
" -e <expr>, --regex=<expr>\n"
" Only print lines where the log message matches <expr>\n"
" where <expr> is a regular expression\n"
// Leave --head undocumented as alias for -m
" -m <count>, --max-count=<count>\n"
" Quit after printing <count> lines. This is meant to be\n"
" paired with --regex, but will work on its own.\n"
" --print Paired with --regex and --max-count to let content bypass\n"
" regex filter but still stop at number of matches.\n"
// Leave --tail undocumented as alias for -t
" -t <count> Print only the most recent <count> lines (implies -d)\n"
" -t '<time>' Print most recent lines since specified time (implies -d)\n"
" -T <count> Print only the most recent <count> lines (does not imply -d)\n"
" -T '<time>' Print most recent lines since specified time (not imply -d)\n"
" count is pure numerical, time is 'MM-DD hh:mm:ss.mmm...'\n"
" 'YYYY-MM-DD hh:mm:ss.mmm...' or 'sssss.mmm...' format\n"
" -g, --buffer-size Get the size of the ring buffer.\n"
" -G <size>, --buffer-size=<size>\n"
" Set size of log ring buffer, may suffix with K or M.\n"
" -L, -last Dump logs from prior to last reboot\n"
// Leave security (Device Owner only installations) and
// kernel (userdebug and eng) buffers undocumented.
" -b <buffer>, --buffer=<buffer> Request alternate ring buffer, 'main',\n"
" 'system', 'radio', 'events', 'crash', 'default' or 'all'.\n"
" Multiple -b parameters or comma separated list of buffers are\n"
" allowed. Buffers interleaved. Default -b main,system,crash.\n"
" -B, --binary Output the log in binary.\n"
" -S, --statistics Output statistics.\n"
" -p, --prune Print prune white and ~black list. Service is specified as\n"
" UID, UID/PID or /PID. Weighed for quicker pruning if prefix\n"
" with ~, otherwise weighed for longevity if unadorned. All\n"
" other pruning activity is oldest first. Special case ~!\n"
" represents an automatic quicker pruning for the noisiest\n"
" UID as determined by the current statistics.\n"
" -P '<list> ...', --prune='<list> ...'\n"
" Set prune white and ~black list, using same format as\n"
" listed above. Must be quoted.\n"
" --pid=<pid> Only prints logs from the given pid.\n"
// Check ANDROID_LOG_WRAP_DEFAULT_TIMEOUT value for match to 2 hours
" --wrap Sleep for 2 hours or when buffer about to wrap whichever\n"
" comes first. Improves efficiency of polling by providing\n"
" an about-to-wrap wakeup.\n");
fprintf(stderr,"\nfilterspecs are a series of \n"
" <tag>[:priority]\n\n"
"where <tag> is a log component tag (or * for all) and priority is:\n"
" V Verbose (default for <tag>)\n"
" D Debug (default for '*')\n"
" I Info\n"
" W Warn\n"
" E Error\n"
" F Fatal\n"
" S Silent (suppress all output)\n"
"\n'*' by itself means '*:D' and <tag> by itself means <tag>:V.\n"
"If no '*' filterspec or -s on command line, all filter defaults to '*:V'.\n"
"eg: '*:S <tag>' prints only <tag>, '<tag>:S' suppresses all <tag> log messages.\n"
"\nIf not specified on the command line, filterspec is set from ANDROID_LOG_TAGS.\n"
"\nIf not specified with -v on command line, format is set from ANDROID_PRINTF_LOG\n"
"or defaults to \"threadtime\"\n\n");
}
static int setLogFormat(const char * formatString)
{
static AndroidLogPrintFormat format;
format = android_log_formatFromString(formatString);
if (format == FORMAT_OFF) {
// FORMAT_OFF means invalid string
return -1;
}
return android_log_setPrintFormat(g_logformat, format);
}
static const char multipliers[][2] = {
{ "" },
{ "K" },
{ "M" },
{ "G" }
};
static unsigned long value_of_size(unsigned long value)
{
for (unsigned i = 0;
(i < sizeof(multipliers)/sizeof(multipliers[0])) && (value >= 1024);
value /= 1024, ++i) ;
return value;
}
static const char *multiplier_of_size(unsigned long value)
{
unsigned i;
for (i = 0;
(i < sizeof(multipliers)/sizeof(multipliers[0])) && (value >= 1024);
value /= 1024, ++i) ;
return multipliers[i];
}
/*String to unsigned int, returns -1 if it fails*/
static bool getSizeTArg(char *ptr, size_t *val, size_t min = 0,
size_t max = SIZE_MAX)
{
if (!ptr) {
return false;
}
char *endp;
errno = 0;
size_t ret = (size_t)strtoll(ptr, &endp, 0);
if (endp[0] || errno) {
return false;
}
if ((ret > max) || (ret < min)) {
return false;
}
*val = ret;
return true;
}
static void logcat_panic(bool showHelp, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
if (showHelp) {
show_help(getprogname());
}
exit(EXIT_FAILURE);
}
static char *parseTime(log_time &t, const char *cp) {
char *ep = t.strptime(cp, "%m-%d %H:%M:%S.%q");
if (ep) {
return ep;
}
ep = t.strptime(cp, "%Y-%m-%d %H:%M:%S.%q");
if (ep) {
return ep;
}
return t.strptime(cp, "%s.%q");
}
// Find last logged line in gestalt of all matching existing output files
static log_time lastLogTime(char *outputFileName) {
log_time retval(log_time::EPOCH);
if (!outputFileName) {
return retval;
}
std::string directory;
char *file = strrchr(outputFileName, '/');
if (!file) {
directory = ".";
file = outputFileName;
} else {
*file = '\0';
directory = outputFileName;
*file = '/';
++file;
}
std::unique_ptr<DIR, int(*)(DIR*)>
dir(opendir(directory.c_str()), closedir);
if (!dir.get()) {
return retval;
}
clockid_t clock_type = android_log_clockid();
log_time now(clock_type);
bool monotonic = clock_type == CLOCK_MONOTONIC;
size_t len = strlen(file);
log_time modulo(0, NS_PER_SEC);
struct dirent *dp;
while ((dp = readdir(dir.get())) != NULL) {
if ((dp->d_type != DT_REG)
// If we are using realtime, check all files that match the
// basename for latest time. If we are using monotonic time
// then only check the main file because time cycles on
// every reboot.
|| strncmp(dp->d_name, file, len + monotonic)
|| (dp->d_name[len]
&& ((dp->d_name[len] != '.')
|| !isdigit(dp->d_name[len+1])))) {
continue;
}
std::string file_name = directory;
file_name += "/";
file_name += dp->d_name;
std::string file;
if (!android::base::ReadFileToString(file_name, &file)) {
continue;
}
bool found = false;
for (const auto& line : android::base::Split(file, "\n")) {
log_time t(log_time::EPOCH);
char *ep = parseTime(t, line.c_str());
if (!ep || (*ep != ' ')) {
continue;
}
// determine the time precision of the logs (eg: msec or usec)
for (unsigned long mod = 1UL; mod < modulo.tv_nsec; mod *= 10) {
if (t.tv_nsec % (mod * 10)) {
modulo.tv_nsec = mod;
break;
}
}
// We filter any times later than current as we may not have the
// year stored with each log entry. Also, since it is possible for
// entries to be recorded out of order (very rare) we select the
// maximum we find just in case.
if ((t < now) && (t > retval)) {
retval = t;
found = true;
}
}
// We count on the basename file to be the definitive end, so stop here.
if (!dp->d_name[len] && found) {
break;
}
}
if (retval == log_time::EPOCH) {
return retval;
}
// tail_time prints matching or higher, round up by the modulo to prevent
// a replay of the last entry we have just checked.
retval += modulo;
return retval;
}
} /* namespace android */
int main(int argc, char **argv)
{
using namespace android;
int err;
int hasSetLogFormat = 0;
int clearLog = 0;
int getLogSize = 0;
unsigned long setLogSize = 0;
int getPruneList = 0;
char *setPruneList = NULL;
int printStatistics = 0;
int mode = ANDROID_LOG_RDONLY;
const char *forceFilters = NULL;
log_device_t* devices = NULL;
log_device_t* dev;
bool printDividers = false;
struct logger_list *logger_list;
size_t tail_lines = 0;
log_time tail_time(log_time::EPOCH);
size_t pid = 0;
bool got_t = false;
signal(SIGPIPE, exit);
g_logformat = android_log_format_new();
if (argc == 2 && 0 == strcmp(argv[1], "--help")) {
show_help(argv[0]);
return EXIT_SUCCESS;
}
for (;;) {
int ret;
int option_index = 0;
// list of long-argument only strings for later comparison
static const char pid_str[] = "pid";
static const char wrap_str[] = "wrap";
static const char print_str[] = "print";
static const struct option long_options[] = {
{ "binary", no_argument, NULL, 'B' },
{ "buffer", required_argument, NULL, 'b' },
{ "buffer-size", optional_argument, NULL, 'g' },
{ "clear", no_argument, NULL, 'c' },
{ "dividers", no_argument, NULL, 'D' },
{ "file", required_argument, NULL, 'f' },
{ "format", required_argument, NULL, 'v' },
// hidden and undocumented reserved alias for --regex
{ "grep", required_argument, NULL, 'e' },
// hidden and undocumented reserved alias for --max-count
{ "head", required_argument, NULL, 'm' },
{ "last", no_argument, NULL, 'L' },
{ "max-count", required_argument, NULL, 'm' },
{ pid_str, required_argument, NULL, 0 },
{ print_str, no_argument, NULL, 0 },
{ "prune", optional_argument, NULL, 'p' },
{ "regex", required_argument, NULL, 'e' },
{ "rotate-count", required_argument, NULL, 'n' },
{ "rotate-kbytes", required_argument, NULL, 'r' },
{ "statistics", no_argument, NULL, 'S' },
// hidden and undocumented reserved alias for -t
{ "tail", required_argument, NULL, 't' },
// support, but ignore and do not document, the optional argument
{ wrap_str, optional_argument, NULL, 0 },
{ NULL, 0, NULL, 0 }
};
ret = getopt_long(argc, argv, ":cdDLt:T:gG:sQf:r:n:v:b:BSpP:m:e:",
long_options, &option_index);
if (ret < 0) {
break;
}
switch (ret) {
case 0:
// One of the long options
if (long_options[option_index].name == pid_str) {
// ToDo: determine runtime PID_MAX?
if (!getSizeTArg(optarg, &pid, 1)) {
logcat_panic(true, "%s %s out of range\n",
long_options[option_index].name, optarg);
}
break;
}
if (long_options[option_index].name == wrap_str) {
mode |= ANDROID_LOG_WRAP |
ANDROID_LOG_RDONLY |
ANDROID_LOG_NONBLOCK;
// ToDo: implement API that supports setting a wrap timeout
size_t dummy = ANDROID_LOG_WRAP_DEFAULT_TIMEOUT;
if (optarg && !getSizeTArg(optarg, &dummy, 1)) {
logcat_panic(true, "%s %s out of range\n",
long_options[option_index].name, optarg);
}
if (dummy != ANDROID_LOG_WRAP_DEFAULT_TIMEOUT) {
fprintf(stderr,
"WARNING: %s %u seconds, ignoring %zu\n",
long_options[option_index].name,
ANDROID_LOG_WRAP_DEFAULT_TIMEOUT, dummy);
}
break;
}
if (long_options[option_index].name == print_str) {
g_printItAnyways = true;
break;
}
break;
case 's':
// default to all silent
android_log_addFilterRule(g_logformat, "*:s");
break;
case 'c':
clearLog = 1;
mode |= ANDROID_LOG_WRONLY;
break;
case 'L':
mode |= ANDROID_LOG_PSTORE;
break;
case 'd':
mode |= ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK;
break;
case 't':
got_t = true;
mode |= ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK;
/* FALLTHRU */
case 'T':
if (strspn(optarg, "0123456789") != strlen(optarg)) {
char *cp = parseTime(tail_time, optarg);
if (!cp) {
logcat_panic(false, "-%c \"%s\" not in time format\n",
ret, optarg);
}
if (*cp) {
char c = *cp;
*cp = '\0';
fprintf(stderr,
"WARNING: -%c \"%s\"\"%c%s\" time truncated\n",
ret, optarg, c, cp + 1);
*cp = c;
}
} else {
if (!getSizeTArg(optarg, &tail_lines, 1)) {
fprintf(stderr,
"WARNING: -%c %s invalid, setting to 1\n",
ret, optarg);
tail_lines = 1;
}
}
break;
case 'D':
printDividers = true;
break;
case 'e':
g_regex = new pcrecpp::RE(optarg);
break;
case 'm': {
char *end = NULL;
if (!getSizeTArg(optarg, &g_maxCount)) {
logcat_panic(false, "-%c \"%s\" isn't an "
"integer greater than zero\n", ret, optarg);
}
}
break;
case 'g':
if (!optarg) {
getLogSize = 1;
break;
}
// FALLTHRU
case 'G': {
char *cp;
if (strtoll(optarg, &cp, 0) > 0) {
setLogSize = strtoll(optarg, &cp, 0);
} else {
setLogSize = 0;
}
switch(*cp) {
case 'g':
case 'G':
setLogSize *= 1024;
/* FALLTHRU */
case 'm':
case 'M':
setLogSize *= 1024;
/* FALLTHRU */
case 'k':
case 'K':
setLogSize *= 1024;
/* FALLTHRU */
case '\0':
break;
default:
setLogSize = 0;
}
if (!setLogSize) {
fprintf(stderr, "ERROR: -G <num><multiplier>\n");
return EXIT_FAILURE;
}
}
break;
case 'p':
if (!optarg) {
getPruneList = 1;
break;
}
// FALLTHRU
case 'P':
setPruneList = optarg;
break;
case 'b': {
unsigned idMask = 0;
while ((optarg = strtok(optarg, ",:; \t\n\r\f")) != NULL) {
if (strcmp(optarg, "default") == 0) {
idMask |= (1 << LOG_ID_MAIN) |
(1 << LOG_ID_SYSTEM) |
(1 << LOG_ID_CRASH);
} else if (strcmp(optarg, "all") == 0) {
idMask = (unsigned)-1;
} else {
log_id_t log_id = android_name_to_log_id(optarg);
const char *name = android_log_id_to_name(log_id);
if (strcmp(name, optarg) != 0) {
logcat_panic(true, "unknown buffer %s\n", optarg);
}
idMask |= (1 << log_id);
}
optarg = NULL;
}
for (int i = LOG_ID_MIN; i < LOG_ID_MAX; ++i) {
const char *name = android_log_id_to_name((log_id_t)i);
log_id_t log_id = android_name_to_log_id(name);
if (log_id != (log_id_t)i) {
continue;
}
if ((idMask & (1 << i)) == 0) {
continue;
}
bool found = false;
for (dev = devices; dev; dev = dev->next) {
if (!strcmp(name, dev->device)) {
found = true;
break;
}
if (!dev->next) {
break;
}
}
if (found) {
continue;
}
bool binary = !strcmp(name, "events") ||
!strcmp(name, "security");
log_device_t* d = new log_device_t(name, binary);
if (dev) {
dev->next = d;
dev = d;
} else {
devices = dev = d;
}
g_devCount++;
}
}
break;
case 'B':
g_printBinary = 1;
break;
case 'f':
if ((tail_time == log_time::EPOCH) && (tail_lines == 0)) {
tail_time = lastLogTime(optarg);
}
// redirect output to a file
g_outputFileName = optarg;
break;
case 'r':
if (!getSizeTArg(optarg, &g_logRotateSizeKBytes, 1)) {
logcat_panic(true, "Invalid parameter %s to -r\n", optarg);
}
break;
case 'n':
if (!getSizeTArg(optarg, &g_maxRotatedLogs, 1)) {
logcat_panic(true, "Invalid parameter %s to -n\n", optarg);
}
break;
case 'v':
err = setLogFormat (optarg);
if (err < 0) {
logcat_panic(true, "Invalid parameter %s to -v\n", optarg);
}
hasSetLogFormat |= err;
break;
case 'Q':
/* this is a *hidden* option used to start a version of logcat */
/* in an emulated device only. it basically looks for androidboot.logcat= */
/* on the kernel command line. If something is found, it extracts a log filter */
/* and uses it to run the program. If nothing is found, the program should */
/* quit immediately */
#define KERNEL_OPTION "androidboot.logcat="
#define CONSOLE_OPTION "androidboot.console="
{
int fd;
char* logcat;
char* console;
int force_exit = 1;
static char cmdline[1024];
fd = open("/proc/cmdline", O_RDONLY);
if (fd >= 0) {
int n = read(fd, cmdline, sizeof(cmdline)-1 );
if (n < 0) n = 0;
cmdline[n] = 0;
close(fd);
} else {
cmdline[0] = 0;
}
logcat = strstr( cmdline, KERNEL_OPTION );
console = strstr( cmdline, CONSOLE_OPTION );
if (logcat != NULL) {
char* p = logcat + sizeof(KERNEL_OPTION)-1;;
char* q = strpbrk( p, " \t\n\r" );;
if (q != NULL)
*q = 0;
forceFilters = p;
force_exit = 0;
}
/* if nothing found or invalid filters, exit quietly */
if (force_exit) {
return EXIT_SUCCESS;
}
/* redirect our output to the emulator console */
if (console) {
char* p = console + sizeof(CONSOLE_OPTION)-1;
char* q = strpbrk( p, " \t\n\r" );
char devname[64];
int len;
if (q != NULL) {
len = q - p;
} else
len = strlen(p);
len = snprintf( devname, sizeof(devname), "/dev/%.*s", len, p );
fprintf(stderr, "logcat using %s (%d)\n", devname, len);
if (len < (int)sizeof(devname)) {
fd = open( devname, O_WRONLY );
if (fd >= 0) {
dup2(fd, 1);
dup2(fd, 2);
close(fd);
}
}
}
}
break;
case 'S':
printStatistics = 1;
break;
case ':':
logcat_panic(true, "Option -%c needs an argument\n", optopt);
break;
default:
logcat_panic(true, "Unrecognized Option %c\n", optopt);
break;
}
}
if (g_maxCount && got_t) {
logcat_panic(true, "Cannot use -m (--max-count) and -t together\n");
}
if (g_printItAnyways && (!g_regex || !g_maxCount)) {
// One day it would be nice if --print -v color and --regex <expr>
// could play with each other and show regex highlighted content.
fprintf(stderr, "WARNING: "
"--print ignored, to be used in combination with\n"
" "
"--regex <expr> and --max-count <N>\n");
g_printItAnyways = false;
}
if (!devices) {
dev = devices = new log_device_t("main", false);
g_devCount = 1;
if (android_name_to_log_id("system") == LOG_ID_SYSTEM) {
dev = dev->next = new log_device_t("system", false);
g_devCount++;
}
if (android_name_to_log_id("crash") == LOG_ID_CRASH) {
dev = dev->next = new log_device_t("crash", false);
g_devCount++;
}
}
if (g_logRotateSizeKBytes != 0 && g_outputFileName == NULL) {
logcat_panic(true, "-r requires -f as well\n");
}
setupOutput();
if (hasSetLogFormat == 0) {
const char* logFormat = getenv("ANDROID_PRINTF_LOG");
if (logFormat != NULL) {
err = setLogFormat(logFormat);
if (err < 0) {
fprintf(stderr, "invalid format in ANDROID_PRINTF_LOG '%s'\n",
logFormat);
}
} else {
setLogFormat("threadtime");
}
}
if (forceFilters) {
err = android_log_addFilterString(g_logformat, forceFilters);
if (err < 0) {
logcat_panic(false, "Invalid filter expression in logcat args\n");
}
} else if (argc == optind) {
// Add from environment variable
char *env_tags_orig = getenv("ANDROID_LOG_TAGS");
if (env_tags_orig != NULL) {
err = android_log_addFilterString(g_logformat, env_tags_orig);
if (err < 0) {
logcat_panic(true,
"Invalid filter expression in ANDROID_LOG_TAGS\n");
}
}
} else {
// Add from commandline
for (int i = optind ; i < argc ; i++) {
err = android_log_addFilterString(g_logformat, argv[i]);
if (err < 0) {
logcat_panic(true, "Invalid filter expression '%s'\n", argv[i]);
}
}
}
dev = devices;
if (tail_time != log_time::EPOCH) {
logger_list = android_logger_list_alloc_time(mode, tail_time, pid);
} else {
logger_list = android_logger_list_alloc(mode, tail_lines, pid);
}
const char *openDeviceFail = NULL;
const char *clearFail = NULL;
const char *setSizeFail = NULL;
const char *getSizeFail = NULL;
// We have three orthogonal actions below to clear, set log size and
// get log size. All sharing the same iteration loop.
while (dev) {
dev->logger_list = logger_list;
dev->logger = android_logger_open(logger_list,
android_name_to_log_id(dev->device));
if (!dev->logger) {
openDeviceFail = openDeviceFail ?: dev->device;
dev = dev->next;
continue;
}
if (clearLog) {
if (g_outputFileName) {
int maxRotationCountDigits =
(g_maxRotatedLogs > 0) ? (int) (floor(log10(g_maxRotatedLogs) + 1)) : 0;
for (int i = g_maxRotatedLogs ; i >= 0 ; --i) {
char *file;
if (i == 0) {
asprintf(&file, "%s", g_outputFileName);
} else {
asprintf(&file, "%s.%.*d", g_outputFileName, maxRotationCountDigits, i);
}
if (!file) {
perror("while clearing log files");
clearFail = clearFail ?: dev->device;
break;
}
err = unlink(file);
if (err < 0 && errno != ENOENT && clearFail == NULL) {
perror("while clearing log files");
clearFail = dev->device;
}
free(file);
}
} else if (android_logger_clear(dev->logger)) {
clearFail = clearFail ?: dev->device;
}
}
if (setLogSize) {
if (android_logger_set_log_size(dev->logger, setLogSize)) {
setSizeFail = setSizeFail ?: dev->device;
}
}
if (getLogSize) {
long size = android_logger_get_log_size(dev->logger);
long readable = android_logger_get_log_readable_size(dev->logger);
if ((size < 0) || (readable < 0)) {
getSizeFail = getSizeFail ?: dev->device;
} else {
printf("%s: ring buffer is %ld%sb (%ld%sb consumed), "
"max entry is %db, max payload is %db\n", dev->device,
value_of_size(size), multiplier_of_size(size),
value_of_size(readable), multiplier_of_size(readable),
(int) LOGGER_ENTRY_MAX_LEN,
(int) LOGGER_ENTRY_MAX_PAYLOAD);
}
}
dev = dev->next;
}
// report any errors in the above loop and exit
if (openDeviceFail) {
logcat_panic(false, "Unable to open log device '%s'\n", openDeviceFail);
}
if (clearFail) {
logcat_panic(false, "failed to clear the '%s' log\n", clearFail);
}
if (setSizeFail) {
logcat_panic(false, "failed to set the '%s' log size\n", setSizeFail);
}
if (getSizeFail) {
logcat_panic(false, "failed to get the readable '%s' log size",
getSizeFail);
}
if (setPruneList) {
size_t len = strlen(setPruneList);
/*extra 32 bytes are needed by android_logger_set_prune_list */
size_t bLen = len + 32;
char *buf = NULL;
if (asprintf(&buf, "%-*s", (int)(bLen - 1), setPruneList) > 0) {
buf[len] = '\0';
if (android_logger_set_prune_list(logger_list, buf, bLen)) {
logcat_panic(false, "failed to set the prune list");
}
free(buf);
} else {
logcat_panic(false, "failed to set the prune list (alloc)");
}
}
if (printStatistics || getPruneList) {
size_t len = 8192;
char *buf;
for (int retry = 32;
(retry >= 0) && ((buf = new char [len]));
delete [] buf, buf = NULL, --retry) {
if (getPruneList) {
android_logger_get_prune_list(logger_list, buf, len);
} else {
android_logger_get_statistics(logger_list, buf, len);
}
buf[len-1] = '\0';
if (atol(buf) < 3) {
delete [] buf;
buf = NULL;
break;
}
size_t ret = atol(buf) + 1;
if (ret <= len) {
len = ret;
break;
}
len = ret;
}
if (!buf) {
logcat_panic(false, "failed to read data");
}
// remove trailing FF
char *cp = buf + len - 1;
*cp = '\0';
bool truncated = *--cp != '\f';
if (!truncated) {
*cp = '\0';
}
// squash out the byte count
cp = buf;
if (!truncated) {
while (isdigit(*cp)) {
++cp;
}
if (*cp == '\n') {
++cp;
}
}
printf("%s", cp);
delete [] buf;
return EXIT_SUCCESS;
}
if (getLogSize) {
return EXIT_SUCCESS;
}
if (setLogSize || setPruneList) {
return EXIT_SUCCESS;
}
if (clearLog) {
return EXIT_SUCCESS;
}
//LOG_EVENT_INT(10, 12345);
//LOG_EVENT_LONG(11, 0x1122334455667788LL);
//LOG_EVENT_STRING(0, "whassup, doc?");
dev = NULL;
log_device_t unexpected("unexpected", false);
while (!g_maxCount || (g_printCount < g_maxCount)) {
struct log_msg log_msg;
log_device_t* d;
int ret = android_logger_list_read(logger_list, &log_msg);
if (ret == 0) {
logcat_panic(false, "read: unexpected EOF!\n");
}
if (ret < 0) {
if (ret == -EAGAIN) {
break;
}
if (ret == -EIO) {
logcat_panic(false, "read: unexpected EOF!\n");
}
if (ret == -EINVAL) {
logcat_panic(false, "read: unexpected length.\n");
}
logcat_panic(false, "logcat read failure");
}
for (d = devices; d; d = d->next) {
if (android_name_to_log_id(d->device) == log_msg.id()) {
break;
}
}
if (!d) {
g_devCount = 2; // set to Multiple
d = &unexpected;
d->binary = log_msg.id() == LOG_ID_EVENTS;
}
if (dev != d) {
dev = d;
maybePrintStart(dev, printDividers);
}
if (g_printBinary) {
printBinary(&log_msg);
} else {
processBuffer(dev, &log_msg);
}
}
android_logger_list_free(logger_list);
return EXIT_SUCCESS;
}
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