logcat.cpp revision ce6d46c69aad22b0e05cb4a6e130da340c06629a 
1// Copyright 2006-2014 The Android Open Source Project
2
3#include <assert.h>
4#include <ctype.h>
5#include <errno.h>
6#include <fcntl.h>
7#include <stdio.h>
8#include <stdlib.h>
9#include <stdarg.h>
10#include <string.h>
11#include <signal.h>
12#include <time.h>
13#include <unistd.h>
14#include <sys/socket.h>
15#include <sys/stat.h>
16#include <arpa/inet.h>
17
18#include <cutils/sockets.h>
19#include <log/log.h>
20#include <log/log_read.h>
21#include <log/logger.h>
22#include <log/logd.h>
23#include <log/logprint.h>
24#include <log/event_tag_map.h>
25
26#define DEFAULT_LOG_ROTATE_SIZE_KBYTES 16
27#define DEFAULT_MAX_ROTATED_LOGS 4
28
29static AndroidLogFormat * g_logformat;
30
31/* logd prefixes records with a length field */
32#define RECORD_LENGTH_FIELD_SIZE_BYTES sizeof(uint32_t)
33
34struct log_device_t {
35    const char* device;
36    bool binary;
37    struct logger *logger;
38    struct logger_list *logger_list;
39    bool printed;
40    char label;
41
42    log_device_t* next;
43
44    log_device_t(const char* d, bool b, char l) {
45        device = d;
46        binary = b;
47        label = l;
48        next = NULL;
49        printed = false;
50    }
51};
52
53namespace android {
54
55/* Global Variables */
56
57static const char * g_outputFileName = NULL;
58static int g_logRotateSizeKBytes = 0;                   // 0 means "no log rotation"
59static int g_maxRotatedLogs = DEFAULT_MAX_ROTATED_LOGS; // 0 means "unbounded"
60static int g_outFD = -1;
61static off_t g_outByteCount = 0;
62static int g_printBinary = 0;
63static int g_devCount = 0;
64
65static EventTagMap* g_eventTagMap = NULL;
66
67static int openLogFile (const char *pathname)
68{
69    return open(pathname, O_WRONLY | O_APPEND | O_CREAT, S_IRUSR | S_IWUSR);
70}
71
72static void rotateLogs()
73{
74    int err;
75
76    // Can't rotate logs if we're not outputting to a file
77    if (g_outputFileName == NULL) {
78        return;
79    }
80
81    close(g_outFD);
82
83    for (int i = g_maxRotatedLogs ; i > 0 ; i--) {
84        char *file0, *file1;
85
86        asprintf(&file1, "%s.%d", g_outputFileName, i);
87
88        if (i - 1 == 0) {
89            asprintf(&file0, "%s", g_outputFileName);
90        } else {
91            asprintf(&file0, "%s.%d", g_outputFileName, i - 1);
92        }
93
94        err = rename (file0, file1);
95
96        if (err < 0 && errno != ENOENT) {
97            perror("while rotating log files");
98        }
99
100        free(file1);
101        free(file0);
102    }
103
104    g_outFD = openLogFile (g_outputFileName);
105
106    if (g_outFD < 0) {
107        perror ("couldn't open output file");
108        exit(-1);
109    }
110
111    g_outByteCount = 0;
112
113}
114
115void printBinary(struct log_msg *buf)
116{
117    size_t size = buf->len();
118
119    TEMP_FAILURE_RETRY(write(g_outFD, buf, size));
120}
121
122static void processBuffer(log_device_t* dev, struct log_msg *buf)
123{
124    int bytesWritten = 0;
125    int err;
126    AndroidLogEntry entry;
127    char binaryMsgBuf[1024];
128
129    if (dev->binary) {
130        err = android_log_processBinaryLogBuffer(&buf->entry_v1, &entry,
131                                                 g_eventTagMap,
132                                                 binaryMsgBuf,
133                                                 sizeof(binaryMsgBuf));
134        //printf(">>> pri=%d len=%d msg='%s'\n",
135        //    entry.priority, entry.messageLen, entry.message);
136    } else {
137        err = android_log_processLogBuffer(&buf->entry_v1, &entry);
138    }
139    if (err < 0) {
140        goto error;
141    }
142
143    if (android_log_shouldPrintLine(g_logformat, entry.tag, entry.priority)) {
144        if (false && g_devCount > 1) {
145            binaryMsgBuf[0] = dev->label;
146            binaryMsgBuf[1] = ' ';
147            bytesWritten = write(g_outFD, binaryMsgBuf, 2);
148            if (bytesWritten < 0) {
149                perror("output error");
150                exit(-1);
151            }
152        }
153
154        bytesWritten = android_log_printLogLine(g_logformat, g_outFD, &entry);
155
156        if (bytesWritten < 0) {
157            perror("output error");
158            exit(-1);
159        }
160    }
161
162    g_outByteCount += bytesWritten;
163
164    if (g_logRotateSizeKBytes > 0
165        && (g_outByteCount / 1024) >= g_logRotateSizeKBytes
166    ) {
167        rotateLogs();
168    }
169
170error:
171    //fprintf (stderr, "Error processing record\n");
172    return;
173}
174
175static void maybePrintStart(log_device_t* dev) {
176    if (!dev->printed) {
177        dev->printed = true;
178        if (g_devCount > 1 && !g_printBinary) {
179            char buf[1024];
180            snprintf(buf, sizeof(buf), "--------- beginning of %s\n",
181                     dev->device);
182            if (write(g_outFD, buf, strlen(buf)) < 0) {
183                perror("output error");
184                exit(-1);
185            }
186        }
187    }
188}
189
190static void setupOutput()
191{
192
193    if (g_outputFileName == NULL) {
194        g_outFD = STDOUT_FILENO;
195
196    } else {
197        struct stat statbuf;
198
199        g_outFD = openLogFile (g_outputFileName);
200
201        if (g_outFD < 0) {
202            perror ("couldn't open output file");
203            exit(-1);
204        }
205
206        fstat(g_outFD, &statbuf);
207
208        g_outByteCount = statbuf.st_size;
209    }
210}
211
212static void show_help(const char *cmd)
213{
214    fprintf(stderr,"Usage: %s [options] [filterspecs]\n", cmd);
215
216    fprintf(stderr, "options include:\n"
217                    "  -s              Set default filter to silent.\n"
218                    "                  Like specifying filterspec '*:s'\n"
219                    "  -f <filename>   Log to file. Default to stdout\n"
220                    "  -r [<kbytes>]   Rotate log every kbytes. (16 if unspecified). Requires -f\n"
221                    "  -n <count>      Sets max number of rotated logs to <count>, default 4\n"
222                    "  -v <format>     Sets the log print format, where <format> is one of:\n\n"
223                    "                  brief process tag thread raw time threadtime long\n\n"
224                    "  -c              clear (flush) the entire log and exit\n"
225                    "  -d              dump the log and then exit (don't block)\n"
226                    "  -t <count>      print only the most recent <count> lines (implies -d)\n"
227                    "  -T <count>      print only the most recent <count> lines (does not imply -d)\n"
228                    "  -g              get the size of the log's ring buffer and exit\n"
229                    "  -b <buffer>     Request alternate ring buffer, 'main', 'system', 'radio',\n"
230                    "                  'events', 'crash' or 'all'. Multiple -b parameters are\n"
231                    "                  allowed and results are interleaved. The default is\n"
232                    "                  -b main -b system -b crash.\n"
233                    "  -B              output the log in binary.\n"
234                    "  -S              output statistics.\n"
235                    "  -G <size>       set size of log ring buffer, may suffix with K or M.\n"
236                    "  -p              print prune white and ~black list. Service is specified as\n"
237                    "                  UID, UID/PID or /PID. Weighed for quicker pruning if prefix\n"
238                    "                  with ~, otherwise weighed for longevity if unadorned. All\n"
239                    "                  other pruning activity is oldest first. Special case ~!\n"
240                    "                  represents an automatic quicker pruning for the noisiest\n"
241                    "                  UID as determined by the current statistics.\n"
242                    "  -P '<list> ...' set prune white and ~black list, using same format as\n"
243                    "                  printed above. Must be quoted.\n");
244
245    fprintf(stderr,"\nfilterspecs are a series of \n"
246                   "  <tag>[:priority]\n\n"
247                   "where <tag> is a log component tag (or * for all) and priority is:\n"
248                   "  V    Verbose\n"
249                   "  D    Debug\n"
250                   "  I    Info\n"
251                   "  W    Warn\n"
252                   "  E    Error\n"
253                   "  F    Fatal\n"
254                   "  S    Silent (supress all output)\n"
255                   "\n'*' means '*:d' and <tag> by itself means <tag>:v\n"
256                   "\nIf not specified on the commandline, filterspec is set from ANDROID_LOG_TAGS.\n"
257                   "If no filterspec is found, filter defaults to '*:I'\n"
258                   "\nIf not specified with -v, format is set from ANDROID_PRINTF_LOG\n"
259                   "or defaults to \"brief\"\n\n");
260
261
262
263}
264
265
266} /* namespace android */
267
268static int setLogFormat(const char * formatString)
269{
270    static AndroidLogPrintFormat format;
271
272    format = android_log_formatFromString(formatString);
273
274    if (format == FORMAT_OFF) {
275        // FORMAT_OFF means invalid string
276        return -1;
277    }
278
279    android_log_setPrintFormat(g_logformat, format);
280
281    return 0;
282}
283
284static const char multipliers[][2] = {
285    { "" },
286    { "K" },
287    { "M" },
288    { "G" }
289};
290
291static unsigned long value_of_size(unsigned long value)
292{
293    for (unsigned i = 0;
294            (i < sizeof(multipliers)/sizeof(multipliers[0])) && (value >= 1024);
295            value /= 1024, ++i) ;
296    return value;
297}
298
299static const char *multiplier_of_size(unsigned long value)
300{
301    unsigned i;
302    for (i = 0;
303            (i < sizeof(multipliers)/sizeof(multipliers[0])) && (value >= 1024);
304            value /= 1024, ++i) ;
305    return multipliers[i];
306}
307
308int main(int argc, char **argv)
309{
310    int err;
311    int hasSetLogFormat = 0;
312    int clearLog = 0;
313    int getLogSize = 0;
314    unsigned long setLogSize = 0;
315    int getPruneList = 0;
316    char *setPruneList = NULL;
317    int printStatistics = 0;
318    int mode = O_RDONLY;
319    const char *forceFilters = NULL;
320    log_device_t* devices = NULL;
321    log_device_t* dev;
322    bool needBinary = false;
323    struct logger_list *logger_list;
324    unsigned int tail_lines = 0;
325    log_time tail_time(log_time::EPOCH);
326
327    signal(SIGPIPE, exit);
328
329    g_logformat = android_log_format_new();
330
331    if (argc == 2 && 0 == strcmp(argv[1], "--help")) {
332        android::show_help(argv[0]);
333        exit(0);
334    }
335
336    for (;;) {
337        int ret;
338
339        ret = getopt(argc, argv, "cdt:T:gG:sQf:r::n:v:b:BSpP:");
340
341        if (ret < 0) {
342            break;
343        }
344
345        switch(ret) {
346            case 's':
347                // default to all silent
348                android_log_addFilterRule(g_logformat, "*:s");
349            break;
350
351            case 'c':
352                clearLog = 1;
353                mode = O_WRONLY;
354            break;
355
356            case 'd':
357                mode = O_RDONLY | O_NDELAY;
358            break;
359
360            case 't':
361                mode = O_RDONLY | O_NDELAY;
362                /* FALLTHRU */
363            case 'T':
364                if (strspn(optarg, "0123456789") != strlen(optarg)) {
365                    char *cp = tail_time.strptime(optarg,
366                                                  log_time::default_format);
367                    if (!cp) {
368                        fprintf(stderr,
369                                "ERROR: -%c \"%s\" not in \"%s\" time format\n",
370                                ret, optarg, log_time::default_format);
371                        exit(1);
372                    }
373                    if (*cp) {
374                        char c = *cp;
375                        *cp = '\0';
376                        fprintf(stderr,
377                                "WARNING: -%c \"%s\"\"%c%s\" time truncated\n",
378                                ret, optarg, c, cp + 1);
379                        *cp = c;
380                    }
381                } else {
382                    tail_lines = atoi(optarg);
383                    if (!tail_lines) {
384                        fprintf(stderr,
385                                "WARNING: -%c %s invalid, setting to 1\n",
386                                ret, optarg);
387                        tail_lines = 1;
388                    }
389                }
390            break;
391
392            case 'g':
393                getLogSize = 1;
394            break;
395
396            case 'G': {
397                // would use atol if not for the multiplier
398                char *cp = optarg;
399                setLogSize = 0;
400                while (('0' <= *cp) && (*cp <= '9')) {
401                    setLogSize *= 10;
402                    setLogSize += *cp - '0';
403                    ++cp;
404                }
405
406                switch(*cp) {
407                case 'g':
408                case 'G':
409                    setLogSize *= 1024;
410                /* FALLTHRU */
411                case 'm':
412                case 'M':
413                    setLogSize *= 1024;
414                /* FALLTHRU */
415                case 'k':
416                case 'K':
417                    setLogSize *= 1024;
418                /* FALLTHRU */
419                case '\0':
420                break;
421
422                default:
423                    setLogSize = 0;
424                }
425
426                if (!setLogSize) {
427                    fprintf(stderr, "ERROR: -G <num><multiplier>\n");
428                    exit(1);
429                }
430            }
431            break;
432
433            case 'p':
434                getPruneList = 1;
435            break;
436
437            case 'P':
438                setPruneList = optarg;
439            break;
440
441            case 'b': {
442                if (strcmp(optarg, "all") == 0) {
443                    while (devices) {
444                        dev = devices;
445                        devices = dev->next;
446                        delete dev;
447                    }
448
449                    dev = devices = new log_device_t("main", false, 'm');
450                    android::g_devCount = 1;
451                    if (android_name_to_log_id("system") == LOG_ID_SYSTEM) {
452                        dev->next = new log_device_t("system", false, 's');
453                        if (dev->next) {
454                            dev = dev->next;
455                            android::g_devCount++;
456                        }
457                    }
458                    if (android_name_to_log_id("radio") == LOG_ID_RADIO) {
459                        dev->next = new log_device_t("radio", false, 'r');
460                        if (dev->next) {
461                            dev = dev->next;
462                            android::g_devCount++;
463                        }
464                    }
465                    if (android_name_to_log_id("events") == LOG_ID_EVENTS) {
466                        dev->next = new log_device_t("events", true, 'e');
467                        if (dev->next) {
468                            dev = dev->next;
469                            android::g_devCount++;
470                            needBinary = true;
471                        }
472                    }
473                    if (android_name_to_log_id("crash") == LOG_ID_CRASH) {
474                        dev->next = new log_device_t("crash", false, 'c');
475                        if (dev->next) {
476                            android::g_devCount++;
477                        }
478                    }
479                    break;
480                }
481
482                bool binary = strcmp(optarg, "events") == 0;
483                if (binary) {
484                    needBinary = true;
485                }
486
487                if (devices) {
488                    dev = devices;
489                    while (dev->next) {
490                        dev = dev->next;
491                    }
492                    dev->next = new log_device_t(optarg, binary, optarg[0]);
493                } else {
494                    devices = new log_device_t(optarg, binary, optarg[0]);
495                }
496                android::g_devCount++;
497            }
498            break;
499
500            case 'B':
501                android::g_printBinary = 1;
502            break;
503
504            case 'f':
505                // redirect output to a file
506
507                android::g_outputFileName = optarg;
508
509            break;
510
511            case 'r':
512                if (optarg == NULL) {
513                    android::g_logRotateSizeKBytes
514                                = DEFAULT_LOG_ROTATE_SIZE_KBYTES;
515                } else {
516                    if (!isdigit(optarg[0])) {
517                        fprintf(stderr,"Invalid parameter to -r\n");
518                        android::show_help(argv[0]);
519                        exit(-1);
520                    }
521                    android::g_logRotateSizeKBytes = atoi(optarg);
522                }
523            break;
524
525            case 'n':
526                if (!isdigit(optarg[0])) {
527                    fprintf(stderr,"Invalid parameter to -r\n");
528                    android::show_help(argv[0]);
529                    exit(-1);
530                }
531
532                android::g_maxRotatedLogs = atoi(optarg);
533            break;
534
535            case 'v':
536                err = setLogFormat (optarg);
537                if (err < 0) {
538                    fprintf(stderr,"Invalid parameter to -v\n");
539                    android::show_help(argv[0]);
540                    exit(-1);
541                }
542
543                hasSetLogFormat = 1;
544            break;
545
546            case 'Q':
547                /* this is a *hidden* option used to start a version of logcat                 */
548                /* in an emulated device only. it basically looks for androidboot.logcat=      */
549                /* on the kernel command line. If something is found, it extracts a log filter */
550                /* and uses it to run the program. If nothing is found, the program should     */
551                /* quit immediately                                                            */
552#define  KERNEL_OPTION  "androidboot.logcat="
553#define  CONSOLE_OPTION "androidboot.console="
554                {
555                    int          fd;
556                    char*        logcat;
557                    char*        console;
558                    int          force_exit = 1;
559                    static char  cmdline[1024];
560
561                    fd = open("/proc/cmdline", O_RDONLY);
562                    if (fd >= 0) {
563                        int  n = read(fd, cmdline, sizeof(cmdline)-1 );
564                        if (n < 0) n = 0;
565                        cmdline[n] = 0;
566                        close(fd);
567                    } else {
568                        cmdline[0] = 0;
569                    }
570
571                    logcat  = strstr( cmdline, KERNEL_OPTION );
572                    console = strstr( cmdline, CONSOLE_OPTION );
573                    if (logcat != NULL) {
574                        char*  p = logcat + sizeof(KERNEL_OPTION)-1;;
575                        char*  q = strpbrk( p, " \t\n\r" );;
576
577                        if (q != NULL)
578                            *q = 0;
579
580                        forceFilters = p;
581                        force_exit   = 0;
582                    }
583                    /* if nothing found or invalid filters, exit quietly */
584                    if (force_exit)
585                        exit(0);
586
587                    /* redirect our output to the emulator console */
588                    if (console) {
589                        char*  p = console + sizeof(CONSOLE_OPTION)-1;
590                        char*  q = strpbrk( p, " \t\n\r" );
591                        char   devname[64];
592                        int    len;
593
594                        if (q != NULL) {
595                            len = q - p;
596                        } else
597                            len = strlen(p);
598
599                        len = snprintf( devname, sizeof(devname), "/dev/%.*s", len, p );
600                        fprintf(stderr, "logcat using %s (%d)\n", devname, len);
601                        if (len < (int)sizeof(devname)) {
602                            fd = open( devname, O_WRONLY );
603                            if (fd >= 0) {
604                                dup2(fd, 1);
605                                dup2(fd, 2);
606                                close(fd);
607                            }
608                        }
609                    }
610                }
611                break;
612
613            case 'S':
614                printStatistics = 1;
615                break;
616
617            default:
618                fprintf(stderr,"Unrecognized Option\n");
619                android::show_help(argv[0]);
620                exit(-1);
621            break;
622        }
623    }
624
625    if (!devices) {
626        devices = new log_device_t("main", false, 'm');
627        android::g_devCount = 1;
628        if (android_name_to_log_id("system") == LOG_ID_SYSTEM) {
629            devices->next = new log_device_t("system", false, 's');
630            android::g_devCount++;
631        }
632        if (android_name_to_log_id("crash") == LOG_ID_CRASH) {
633            if (devices->next) {
634                devices->next->next = new log_device_t("crash", false, 'c');
635            } else {
636                devices->next = new log_device_t("crash", false, 'c');
637            }
638            android::g_devCount++;
639        }
640    }
641
642    if (android::g_logRotateSizeKBytes != 0
643        && android::g_outputFileName == NULL
644    ) {
645        fprintf(stderr,"-r requires -f as well\n");
646        android::show_help(argv[0]);
647        exit(-1);
648    }
649
650    android::setupOutput();
651
652    if (hasSetLogFormat == 0) {
653        const char* logFormat = getenv("ANDROID_PRINTF_LOG");
654
655        if (logFormat != NULL) {
656            err = setLogFormat(logFormat);
657
658            if (err < 0) {
659                fprintf(stderr, "invalid format in ANDROID_PRINTF_LOG '%s'\n",
660                                    logFormat);
661            }
662        }
663    }
664
665    if (forceFilters) {
666        err = android_log_addFilterString(g_logformat, forceFilters);
667        if (err < 0) {
668            fprintf (stderr, "Invalid filter expression in -logcat option\n");
669            exit(0);
670        }
671    } else if (argc == optind) {
672        // Add from environment variable
673        char *env_tags_orig = getenv("ANDROID_LOG_TAGS");
674
675        if (env_tags_orig != NULL) {
676            err = android_log_addFilterString(g_logformat, env_tags_orig);
677
678            if (err < 0) {
679                fprintf(stderr, "Invalid filter expression in"
680                                    " ANDROID_LOG_TAGS\n");
681                android::show_help(argv[0]);
682                exit(-1);
683            }
684        }
685    } else {
686        // Add from commandline
687        for (int i = optind ; i < argc ; i++) {
688            err = android_log_addFilterString(g_logformat, argv[i]);
689
690            if (err < 0) {
691                fprintf (stderr, "Invalid filter expression '%s'\n", argv[i]);
692                android::show_help(argv[0]);
693                exit(-1);
694            }
695        }
696    }
697
698    dev = devices;
699    if (tail_time != log_time::EPOCH) {
700        logger_list = android_logger_list_alloc_time(mode, tail_time, 0);
701    } else {
702        logger_list = android_logger_list_alloc(mode, tail_lines, 0);
703    }
704    while (dev) {
705        dev->logger_list = logger_list;
706        dev->logger = android_logger_open(logger_list,
707                                          android_name_to_log_id(dev->device));
708        if (!dev->logger) {
709            fprintf(stderr, "Unable to open log device '%s'\n", dev->device);
710            exit(EXIT_FAILURE);
711        }
712
713        if (clearLog) {
714            int ret;
715            ret = android_logger_clear(dev->logger);
716            if (ret) {
717                perror("failed to clear the log");
718                exit(EXIT_FAILURE);
719            }
720        }
721
722        if (setLogSize && android_logger_set_log_size(dev->logger, setLogSize)) {
723            perror("failed to set the log size");
724            exit(EXIT_FAILURE);
725        }
726
727        if (getLogSize) {
728            long size, readable;
729
730            size = android_logger_get_log_size(dev->logger);
731            if (size < 0) {
732                perror("failed to get the log size");
733                exit(EXIT_FAILURE);
734            }
735
736            readable = android_logger_get_log_readable_size(dev->logger);
737            if (readable < 0) {
738                perror("failed to get the readable log size");
739                exit(EXIT_FAILURE);
740            }
741
742            printf("%s: ring buffer is %ld%sb (%ld%sb consumed), "
743                   "max entry is %db, max payload is %db\n", dev->device,
744                   value_of_size(size), multiplier_of_size(size),
745                   value_of_size(readable), multiplier_of_size(readable),
746                   (int) LOGGER_ENTRY_MAX_LEN, (int) LOGGER_ENTRY_MAX_PAYLOAD);
747        }
748
749        dev = dev->next;
750    }
751
752    if (setPruneList) {
753        size_t len = strlen(setPruneList) + 32; // margin to allow rc
754        char *buf = (char *) malloc(len);
755
756        strcpy(buf, setPruneList);
757        int ret = android_logger_set_prune_list(logger_list, buf, len);
758        free(buf);
759
760        if (ret) {
761            perror("failed to set the prune list");
762            exit(EXIT_FAILURE);
763        }
764    }
765
766    if (printStatistics || getPruneList) {
767        size_t len = 8192;
768        char *buf;
769
770        for(int retry = 32;
771                (retry >= 0) && ((buf = new char [len]));
772                delete [] buf, --retry) {
773            if (getPruneList) {
774                android_logger_get_prune_list(logger_list, buf, len);
775            } else {
776                android_logger_get_statistics(logger_list, buf, len);
777            }
778            buf[len-1] = '\0';
779            size_t ret = atol(buf) + 1;
780            if (ret < 4) {
781                delete [] buf;
782                buf = NULL;
783                break;
784            }
785            bool check = ret <= len;
786            len = ret;
787            if (check) {
788                break;
789            }
790        }
791
792        if (!buf) {
793            perror("failed to read data");
794            exit(EXIT_FAILURE);
795        }
796
797        // remove trailing FF
798        char *cp = buf + len - 1;
799        *cp = '\0';
800        bool truncated = *--cp != '\f';
801        if (!truncated) {
802            *cp = '\0';
803        }
804
805        // squash out the byte count
806        cp = buf;
807        if (!truncated) {
808            while (isdigit(*cp)) {
809                ++cp;
810            }
811            if (*cp == '\n') {
812                ++cp;
813            }
814        }
815
816        printf("%s", cp);
817        delete [] buf;
818        exit(0);
819    }
820
821
822    if (getLogSize) {
823        exit(0);
824    }
825    if (setLogSize || setPruneList) {
826        exit(0);
827    }
828    if (clearLog) {
829        exit(0);
830    }
831
832    //LOG_EVENT_INT(10, 12345);
833    //LOG_EVENT_LONG(11, 0x1122334455667788LL);
834    //LOG_EVENT_STRING(0, "whassup, doc?");
835
836    if (needBinary)
837        android::g_eventTagMap = android_openEventTagMap(EVENT_TAG_MAP_FILE);
838
839    while (1) {
840        struct log_msg log_msg;
841        int ret = android_logger_list_read(logger_list, &log_msg);
842
843        if (ret == 0) {
844            fprintf(stderr, "read: Unexpected EOF!\n");
845            exit(EXIT_FAILURE);
846        }
847
848        if (ret < 0) {
849            if (ret == -EAGAIN) {
850                break;
851            }
852
853            if (ret == -EIO) {
854                fprintf(stderr, "read: Unexpected EOF!\n");
855                exit(EXIT_FAILURE);
856            }
857            if (ret == -EINVAL) {
858                fprintf(stderr, "read: unexpected length.\n");
859                exit(EXIT_FAILURE);
860            }
861            perror("logcat read failure");
862            exit(EXIT_FAILURE);
863        }
864
865        for(dev = devices; dev; dev = dev->next) {
866            if (android_name_to_log_id(dev->device) == log_msg.id()) {
867                break;
868            }
869        }
870        if (!dev) {
871            fprintf(stderr, "read: Unexpected log ID!\n");
872            exit(EXIT_FAILURE);
873        }
874
875        android::maybePrintStart(dev);
876        if (android::g_printBinary) {
877            android::printBinary(&log_msg);
878        } else {
879            android::processBuffer(dev, &log_msg);
880        }
881    }
882
883    android_logger_list_free(logger_list);
884
885    return 0;
886}
887