// Copyright 2006 The Android Open Source Project
#include <cutils/logger.h>
#include <cutils/logd.h>
#include <cutils/sockets.h>
#include <cutils/logprint.h>
#include <cutils/event_tag_map.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <assert.h>
#include <ctype.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#define DEFAULT_LOG_ROTATE_SIZE_KBYTES 16
#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)
#define LOG_FILE_DIR "/dev/log/"
namespace android {
/* Global Variables */
static const char * g_outputFileName = NULL;
static int g_logRotateSizeKBytes = 0; // 0 means "no log rotation"
static int g_maxRotatedLogs = DEFAULT_MAX_ROTATED_LOGS; // 0 means "unbounded"
static int g_outFD = -1;
static off_t g_outByteCount = 0;
static int g_isBinary = 0;
static int g_printBinary = 0;
static EventTagMap* g_eventTagMap = NULL;
static int openLogFile (const char *pathname)
{
return open(g_outputFileName, 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);
for (int i = g_maxRotatedLogs ; i > 0 ; i--) {
char *file0, *file1;
asprintf(&file1, "%s.%d", g_outputFileName, i);
if (i - 1 == 0) {
asprintf(&file0, "%s", g_outputFileName);
} else {
asprintf(&file0, "%s.%d", g_outputFileName, i - 1);
}
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) {
perror ("couldn't open output file");
exit(-1);
}
g_outByteCount = 0;
}
void printBinary(struct logger_entry *buf)
{
size_t size = sizeof(logger_entry) + buf->len;
int ret;
do {
ret = write(g_outFD, buf, size);
} while (ret < 0 && errno == EINTR);
}
static void processBuffer(struct logger_entry *buf)
{
int bytesWritten;
int err;
AndroidLogEntry entry;
char binaryMsgBuf[1024];
if (g_isBinary) {
err = android_log_processBinaryLogBuffer(buf, &entry, g_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);
}
if (err < 0)
goto error;
bytesWritten = android_log_filterAndPrintLogLine(
g_logformat, g_outFD, &entry);
if (bytesWritten < 0) {
perror("output error");
exit(-1);
}
g_outByteCount += bytesWritten;
if (g_logRotateSizeKBytes > 0
&& (g_outByteCount / 1024) >= g_logRotateSizeKBytes
) {
rotateLogs();
}
error:
//fprintf (stderr, "Error processing record\n");
return;
}
static void readLogLines(int logfd)
{
while (1) {
unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1] __attribute__((aligned(4)));
struct logger_entry *entry = (struct logger_entry *) buf;
int ret;
ret = read(logfd, entry, LOGGER_ENTRY_MAX_LEN);
if (ret < 0) {
if (errno == EINTR)
continue;
if (errno == EAGAIN)
break;
perror("logcat read");
exit(EXIT_FAILURE);
}
else if (!ret) {
fprintf(stderr, "read: Unexpected EOF!\n");
exit(EXIT_FAILURE);
}
/* NOTE: driver guarantees we read exactly one full entry */
entry->msg[entry->len] = '\0';
if (g_printBinary) {
printBinary(entry);
} else {
(void) processBuffer(entry);
}
}
}
static int clearLog(int logfd)
{
return ioctl(logfd, LOGGER_FLUSH_LOG);
}
/* returns the total size of the log's ring buffer */
static int getLogSize(int logfd)
{
return ioctl(logfd, LOGGER_GET_LOG_BUF_SIZE);
}
/* returns the readable size of the log's ring buffer (that is, amount of the log consumed) */
static int getLogReadableSize(int logfd)
{
return ioctl(logfd, LOGGER_GET_LOG_LEN);
}
static void setupOutput()
{
if (g_outputFileName == NULL) {
g_outFD = STDOUT_FILENO;
} else {
struct stat statbuf;
g_outFD = openLogFile (g_outputFileName);
if (g_outFD < 0) {
perror ("couldn't open output file");
exit(-1);
}
fstat(g_outFD, &statbuf);
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.\n"
" Like specifying filterspec '*:s'\n"
" -f <filename> Log to file. Default to stdout\n"
" -r [<kbytes>] Rotate log every kbytes. (16 if unspecified). Requires -f\n"
" -n <count> Sets max number of rotated logs to <count>, default 4\n"
" -v <format> Sets the log print format, where <format> is one of:\n\n"
" brief process tag thread raw time threadtime long\n\n"
" -c clear (flush) the entire log and exit\n"
" -d dump the log and then exit (don't block)\n"
" -g get the size of the log's ring buffer and exit\n"
" -b <buffer> request alternate ring buffer\n"
" ('main' (default), 'radio', 'events')\n"
" -B output the log in binary");
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\n"
" D Debug\n"
" I Info\n"
" W Warn\n"
" E Error\n"
" F Fatal\n"
" S Silent (supress all output)\n"
"\n'*' means '*:d' and <tag> by itself means <tag>:v\n"
"\nIf not specified on the commandline, filterspec is set from ANDROID_LOG_TAGS.\n"
"If no filterspec is found, filter defaults to '*:I'\n"
"\nIf not specified with -v, format is set from ANDROID_PRINTF_LOG\n"
"or defaults to \"brief\"\n\n");
}
} /* namespace android */
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;
}
android_log_setPrintFormat(g_logformat, format);
return 0;
}
extern "C" void logprint_run_tests(void);
int main (int argc, char **argv)
{
int logfd;
int err;
int hasSetLogFormat = 0;
int clearLog = 0;
int getLogSize = 0;
int mode = O_RDONLY;
char *log_device = strdup("/dev/"LOGGER_LOG_MAIN);
const char *forceFilters = NULL;
g_logformat = android_log_format_new();
if (argc == 2 && 0 == strcmp(argv[1], "--test")) {
logprint_run_tests();
exit(0);
}
if (argc == 2 && 0 == strcmp(argv[1], "--help")) {
android::show_help(argv[0]);
exit(0);
}
for (;;) {
int ret;
ret = getopt(argc, argv, "cdgsQf:r::n:v:b:B");
if (ret < 0) {
break;
}
switch(ret) {
case 's':
// default to all silent
android_log_addFilterRule(g_logformat, "*:s");
break;
case 'c':
clearLog = 1;
mode = O_WRONLY;
break;
case 'd':
mode |= O_NONBLOCK;
break;
case 'g':
getLogSize = 1;
break;
case 'b':
free(log_device);
log_device =
(char*) malloc(strlen(LOG_FILE_DIR) + strlen(optarg) + 1);
strcpy(log_device, LOG_FILE_DIR);
strcat(log_device, optarg);
android::g_isBinary = (strcmp(optarg, "events") == 0);
break;
case 'B':
android::g_printBinary = 1;
break;
case 'f':
// redirect output to a file
android::g_outputFileName = optarg;
break;
case 'r':
if (optarg == NULL) {
android::g_logRotateSizeKBytes
= DEFAULT_LOG_ROTATE_SIZE_KBYTES;
} else {
long logRotateSize;
char *lastDigit;
if (!isdigit(optarg[0])) {
fprintf(stderr,"Invalid parameter to -r\n");
android::show_help(argv[0]);
exit(-1);
}
android::g_logRotateSizeKBytes = atoi(optarg);
}
break;
case 'n':
if (!isdigit(optarg[0])) {
fprintf(stderr,"Invalid parameter to -r\n");
android::show_help(argv[0]);
exit(-1);
}
android::g_maxRotatedLogs = atoi(optarg);
break;
case 'v':
err = setLogFormat (optarg);
if (err < 0) {
fprintf(stderr,"Invalid parameter to -v\n");
android::show_help(argv[0]);
exit(-1);
}
hasSetLogFormat = 1;
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)
exit(0);
/* 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;
default:
fprintf(stderr,"Unrecognized Option\n");
android::show_help(argv[0]);
exit(-1);
break;
}
}
if (android::g_logRotateSizeKBytes != 0
&& android::g_outputFileName == NULL
) {
fprintf(stderr,"-r requires -f as well\n");
android::show_help(argv[0]);
exit(-1);
}
android::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);
}
}
}
if (forceFilters) {
err = android_log_addFilterString(g_logformat, forceFilters);
if (err < 0) {
fprintf (stderr, "Invalid filter expression in -logcat option\n");
exit(0);
}
} 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) {
fprintf(stderr, "Invalid filter expression in"
" ANDROID_LOG_TAGS\n");
android::show_help(argv[0]);
exit(-1);
}
}
} else {
// Add from commandline
for (int i = optind ; i < argc ; i++) {
err = android_log_addFilterString(g_logformat, argv[i]);
if (err < 0) {
fprintf (stderr, "Invalid filter expression '%s'\n", argv[i]);
android::show_help(argv[0]);
exit(-1);
}
}
}
logfd = open(log_device, mode);
if (logfd < 0) {
fprintf(stderr, "Unable to open log device '%s': %s\n",
log_device, strerror(errno));
exit(EXIT_FAILURE);
}
if (clearLog) {
int ret;
ret = android::clearLog(logfd);
if (ret) {
perror("ioctl");
exit(EXIT_FAILURE);
}
return 0;
}
if (getLogSize) {
int size, readable;
size = android::getLogSize(logfd);
if (size < 0) {
perror("ioctl");
exit(EXIT_FAILURE);
}
readable = android::getLogReadableSize(logfd);
if (readable < 0) {
perror("ioctl");
exit(EXIT_FAILURE);
}
printf("ring buffer is %dKb (%dKb consumed), "
"max entry is %db, max payload is %db\n",
size / 1024, readable / 1024,
(int) LOGGER_ENTRY_MAX_LEN, (int) LOGGER_ENTRY_MAX_PAYLOAD);
return 0;
}
//LOG_EVENT_INT(10, 12345);
//LOG_EVENT_LONG(11, 0x1122334455667788LL);
//LOG_EVENT_STRING(0, "whassup, doc?");
if (android::g_isBinary)
android::g_eventTagMap = android_openEventTagMap(EVENT_TAG_MAP_FILE);
android::readLogLines(logfd);
return 0;
}