aboutsummaryrefslogtreecommitdiff
path: root/xorg-server/os/log.c
blob: 1ecea13e9683542ea7f68d7151faa78c4690fc0c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*

Copyright 1987, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from The Open Group.

Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
Copyright 1994 Quarterdeck Office Systems.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Digital and
Quarterdeck not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior
permission.

DIGITAL AND QUARTERDECK DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT
OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE
OR PERFORMANCE OF THIS SOFTWARE.

*/

/*
 * Copyright (c) 1997-2003 by The XFree86 Project, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the copyright holder(s)
 * and author(s) shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from the copyright holder(s) and author(s).
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <X11/Xos.h>
#include <stdio.h>
#include <time.h>
#include <sys/stat.h>
#include <stdarg.h>
#include <stdlib.h>             /* for malloc() */

#include "input.h"
#include "site.h"
#include "opaque.h"

#ifdef WIN32
#include <process.h>
#ifndef _MSC_VER
#define getpid(x) _getpid(x)
#endif
#endif

#ifdef _MSC_VER
#define S_ISREG(m)  (((m)&_S_IFMT) == _S_IFREG)
#endif

#ifdef XF86BIGFONT
#include "xf86bigfontsrv.h"
#endif

#ifdef __clang__
#pragma clang diagnostic ignored "-Wformat-nonliteral"
#endif

#ifdef DDXOSVERRORF
void (*OsVendorVErrorFProc) (const char *, va_list args) = NULL;
#endif

static FILE *logFile = NULL;
static int logFileFd = -1;
static Bool logFlush = FALSE;
static Bool logSync = FALSE;
static int logVerbosity = DEFAULT_LOG_VERBOSITY;
static int logFileVerbosity = DEFAULT_LOG_FILE_VERBOSITY;

/* Buffer to information logged before the log file is opened. */
static char *saveBuffer = NULL;
static int bufferSize = 0, bufferUnused = 0, bufferPos = 0;
static Bool needBuffer = TRUE;

#ifdef __APPLE__
#include <AvailabilityMacros.h>

static char __crashreporter_info_buff__[4096] = { 0 };

static const char *__crashreporter_info__ __attribute__ ((__used__)) =
    &__crashreporter_info_buff__[0];
#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
// This is actually a toolchain requirement, but I'm not sure the correct check,        
// but it should be fine to just only include it for Leopard and later.  This line
// just tells the linker to never strip this symbol (such as for space optimization)
asm(".desc ___crashreporter_info__, 0x10");
#endif
#endif

/* Prefix strings for log messages. */
#ifndef X_UNKNOWN_STRING
#define X_UNKNOWN_STRING		"(\?\?)"
#endif
#ifndef X_PROBE_STRING
#define X_PROBE_STRING			"(--)"
#endif
#ifndef X_CONFIG_STRING
#define X_CONFIG_STRING			"(**)"
#endif
#ifndef X_DEFAULT_STRING
#define X_DEFAULT_STRING		"(==)"
#endif
#ifndef X_CMDLINE_STRING
#define X_CMDLINE_STRING		"(++)"
#endif
#ifndef X_NOTICE_STRING
#define X_NOTICE_STRING			"(!!)"
#endif
#ifndef X_ERROR_STRING
#define X_ERROR_STRING			"(EE)"
#endif
#ifndef X_WARNING_STRING
#define X_WARNING_STRING		"(WW)"
#endif
#ifndef X_INFO_STRING
#define X_INFO_STRING			"(II)"
#endif
#ifndef X_NOT_IMPLEMENTED_STRING
#define X_NOT_IMPLEMENTED_STRING	"(NI)"
#endif
#ifndef X_DEBUG_STRING
#define X_DEBUG_STRING			"(DB)"
#endif
#ifndef X_NONE_STRING
#define X_NONE_STRING			""
#endif

static size_t
strlen_sigsafe(const char *s)
{
    size_t len;
    for (len = 0; s[len]; len++);
    return len;
}

/*
 * LogInit is called to start logging to a file.  It is also called (with
 * NULL arguments) when logging to a file is not wanted.  It must always be
 * called, otherwise log messages will continue to accumulate in a buffer.
 *
 * %s, if present in the fname or backup strings, is expanded to the display
 * string.
 */

const char *
LogInit(const char *fname, const char *backup)
{
    char *logFileName = NULL;

    if (fname && *fname) {
#if __GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ > 2
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif
        if (asprintf(&logFileName, fname, display) == -1)
            FatalError("Cannot allocate space for the log file name\n");

        if (backup && *backup) {
            struct stat buf;

            if (!stat(logFileName, &buf) && S_ISREG(buf.st_mode)) {
                char *suffix;
                char *oldLog;

#if __GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ > 2
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif
                if ((asprintf(&suffix, backup, display) == -1) ||
                    (asprintf(&oldLog, "%s%s", logFileName, suffix) == -1))
                    FatalError("Cannot allocate space for the log file name\n");
                free(suffix);
                if (rename(logFileName, oldLog) == -1) {
                    FatalError("Cannot move old log file \"%s\" to \"%s\"\n",
                               logFileName, oldLog);
                }
                free(oldLog);
            }
        }
        else {
            unlink(logFileName);
        }
        if ((logFile = fopen(logFileName, "w")) == NULL)
            FatalError("Cannot open log file \"%s\"\n", logFileName);
        setvbuf(logFile, NULL, _IONBF, 0);

        logFileFd = fileno(logFile);

        /* Flush saved log information. */
        if (saveBuffer && bufferSize > 0) {
            fwrite(saveBuffer, bufferPos, 1, logFile);
            fflush(logFile);
#ifndef WIN32
            fsync(fileno(logFile));
#endif
        }
    }

    /*
     * Unconditionally free the buffer, and flag that the buffer is no longer
     * needed.
     */
    if (saveBuffer && bufferSize > 0) {
        free(saveBuffer);
        saveBuffer = NULL;
        bufferSize = 0;
    }
    needBuffer = FALSE;

    return logFileName;
}

void
LogClose(enum ExitCode error)
{
    if (logFile) {
        ErrorFSigSafe("Server terminated %s (%d). Closing log file.\n",
               (error == EXIT_NO_ERROR) ? "successfully" : "with error", error);
        fclose(logFile);
        logFile = NULL;
        logFileFd = -1;
    }
}

Bool
LogSetParameter(LogParameter param, int value)
{
    switch (param) {
    case XLOG_FLUSH:
        logFlush = value ? TRUE : FALSE;
        return TRUE;
    case XLOG_SYNC:
        logSync = value ? TRUE : FALSE;
        return TRUE;
    case XLOG_VERBOSITY:
        logVerbosity = value;
        return TRUE;
    case XLOG_FILE_VERBOSITY:
        logFileVerbosity = value;
        return TRUE;
    default:
        return FALSE;
    }
}

enum {
    LMOD_LONG     = 0x1,
    LMOD_LONGLONG = 0x2,
    LMOD_SHORT    = 0x4,
    LMOD_SIZET    = 0x8,
};

/**
 * Parse non-digit length modifiers and set the corresponding flag in
 * flags_return.
 *
 * @return the number of bytes parsed
 */
static int parse_length_modifier(const char *format, size_t len, int *flags_return)
{
    int idx = 0;
    int length_modifier = 0;

    while (idx < len) {
        switch (format[idx]) {
            case 'l':
                BUG_RETURN_VAL(length_modifier & LMOD_SHORT, 0);

                if (length_modifier & LMOD_LONG)
                    length_modifier |= LMOD_LONGLONG;
                else
                    length_modifier |= LMOD_LONG;
                break;
            case 'h':
                BUG_RETURN_VAL(length_modifier & (LMOD_LONG|LMOD_LONGLONG), 0);
                length_modifier |= LMOD_SHORT;
                /* gcc says 'short int' is promoted to 'int' when
                 * passed through '...', so ignored during
                 * processing */
                break;
            case 'z':
                length_modifier |= LMOD_SIZET;
                break;
            default:
                goto out;
        }
        idx++;
    }

out:
    *flags_return = length_modifier;
    return idx;
}

/**
 * Signal-safe snprintf, with some limitations over snprintf. Be careful
 * which directives you use.
 */
static int
vpnprintf(char *string, int size_in, const char *f, va_list args)
{
    int f_idx = 0;
    int s_idx = 0;
    int f_len = strlen_sigsafe(f);
    char *string_arg;
    char number[21];
    int p_len;
    int i;
    uint64_t ui;
    int64_t si;
    size_t size = size_in;

    for (; f_idx < f_len && s_idx < size - 1; f_idx++) {
        int length_modifier = 0;
        if (f[f_idx] != '%') {
            string[s_idx++] = f[f_idx];
            continue;
        }

        f_idx++;

        /* silently swallow digit length modifiers */
        while (f_idx < f_len && ((f[f_idx] >= '0' && f[f_idx] <= '9') || f[f_idx] == '.'))
            f_idx++;

        /* non-digit length modifiers */
        if (f_idx < f_len) {
            int parsed_bytes = parse_length_modifier(&f[f_idx], f_len - f_idx, &length_modifier);
            if (parsed_bytes < 0)
                return 0;
            f_idx += parsed_bytes;
        }

        if (f_idx >= f_len)
            break;

        switch (f[f_idx]) {
        case 's':
            string_arg = va_arg(args, char*);
            p_len = strlen_sigsafe(string_arg);

            for (i = 0; i < p_len && s_idx < size - 1; i++)
                string[s_idx++] = string_arg[i];
            break;

        case 'u':
            if (length_modifier & LMOD_LONGLONG)
                ui = va_arg(args, unsigned long long);
            else if (length_modifier & LMOD_LONG)
                ui = va_arg(args, unsigned long);
            else if (length_modifier & LMOD_SIZET)
                ui = va_arg(args, size_t);
            else
                ui = va_arg(args, unsigned);

            FormatUInt64(ui, number);
            p_len = strlen_sigsafe(number);

            for (i = 0; i < p_len && s_idx < size - 1; i++)
                string[s_idx++] = number[i];
            break;
        case 'i':
        case 'd':
            if (length_modifier & LMOD_LONGLONG)
                si = va_arg(args, long long);
            else if (length_modifier & LMOD_LONG)
                si = va_arg(args, long);
            else if (length_modifier & LMOD_SIZET)
                si = va_arg(args, ssize_t);
            else
                si = va_arg(args, int);

            FormatInt64(si, number);
            p_len = strlen_sigsafe(number);

            for (i = 0; i < p_len && s_idx < size - 1; i++)
                string[s_idx++] = number[i];
            break;

        case 'p':
            string[s_idx++] = '0';
            if (s_idx < size - 1)
                string[s_idx++] = 'x';
            ui = (uintptr_t)va_arg(args, void*);
            FormatUInt64Hex(ui, number);
            p_len = strlen_sigsafe(number);

            for (i = 0; i < p_len && s_idx < size - 1; i++)
                string[s_idx++] = number[i];
            break;

        case 'x':
            if (length_modifier & LMOD_LONGLONG)
                ui = va_arg(args, unsigned long long);
            else if (length_modifier & LMOD_LONG)
                ui = va_arg(args, unsigned long);
            else if (length_modifier & LMOD_SIZET)
                ui = va_arg(args, size_t);
            else
                ui = va_arg(args, unsigned);

            FormatUInt64Hex(ui, number);
            p_len = strlen_sigsafe(number);

            for (i = 0; i < p_len && s_idx < size - 1; i++)
                string[s_idx++] = number[i];
            break;
        case 'f':
            {
                double d = va_arg(args, double);
                FormatDouble(d, number);
                p_len = strlen_sigsafe(number);

                for (i = 0; i < p_len && s_idx < size - 1; i++)
                    string[s_idx++] = number[i];
            }
            break;
        case 'c':
            {
                char c = va_arg(args, int);
                if (s_idx < size - 1)
                    string[s_idx++] = c;
            }
            break;
        case '%':
            string[s_idx++] = '%';
            break;
        default:
            BUG_WARN_MSG(f[f_idx], "Unsupported printf directive '%c'\n", f[f_idx]);
            va_arg(args, char*);
            string[s_idx++] = '%';
            if (s_idx < size - 1)
                string[s_idx++] = f[f_idx];
            break;
        }
    }

    string[s_idx] = '\0';

    return s_idx;
}

static int
pnprintf(char *string, int size, const char *f, ...)
{
    int rc;
    va_list args;

    va_start(args, f);
    rc = vpnprintf(string, size, f, args);
    va_end(args);

    return rc;
}

/* This function does the actual log message writes. It must be signal safe.
 * When attempting to call non-signal-safe functions, guard them with a check
 * of the inSignalContext global variable. */
static void
LogSWrite(int verb, const char *buf, size_t len, Bool end_line)
{
    static Bool newline = TRUE;
    int ret;

    if (verb < 0 || logVerbosity >= verb)
        ret = write(2, buf, len);

    if (verb < 0 || logFileVerbosity >= verb) {
        if (inSignalContext && logFileFd >= 0) {
            ret = write(logFileFd, buf, len);
#ifndef WIN32
            if (logFlush && logSync)
                fsync(logFileFd);
#endif
        }
        else if (!inSignalContext && logFile) {
//            if (newline)
//                fprintf(logFile, "[%10.3f] ", GetTimeInMillis() / 1000.0);
            newline = end_line;
            fwrite(buf, len, 1, logFile);
            if (logFlush) {
                fflush(logFile);
#ifndef WIN32
                if (logSync)
                    fsync(fileno(logFile));
#endif
            }
        }
        else if (!inSignalContext && needBuffer) {
            if (len > bufferUnused) {
                bufferSize += 1024;
                bufferUnused += 1024;
                saveBuffer = realloc(saveBuffer, bufferSize);
                if (!saveBuffer)
                    FatalError("realloc() failed while saving log messages\n");
            }
            bufferUnused -= len;
            memcpy(saveBuffer + bufferPos, buf, len);
            bufferPos += len;
        }
    }

    /* There's no place to log an error message if the log write
     * fails...
     */
    (void) ret;
}

void
LogVWrite(int verb, const char *f, va_list args)
{
    LogVMessageVerb(X_NONE, verb, f, args);
}

void
LogWrite(int verb, const char *f, ...)
{
    va_list args;

    va_start(args, f);
    LogVWrite(verb, f, args);
    va_end(args);
}

/* Returns the Message Type string to prepend to a logging message, or NULL
 * if the message will be dropped due to insufficient verbosity. */
static const char *
LogMessageTypeVerbString(MessageType type, int verb)
{
    if (type == X_ERROR)
        verb = 0;

    if (logVerbosity < verb && logFileVerbosity < verb)
        return NULL;

    switch (type) {
    case X_PROBED:
        return X_PROBE_STRING;
    case X_CONFIG:
        return X_CONFIG_STRING;
    case X_DEFAULT:
        return X_DEFAULT_STRING;
    case X_CMDLINE:
        return X_CMDLINE_STRING;
    case X_NOTICE:
        return X_NOTICE_STRING;
    case X_ERROR:
        return X_ERROR_STRING;
    case X_WARNING:
        return X_WARNING_STRING;
    case X_INFO:
        return X_INFO_STRING;
    case X_NOT_IMPLEMENTED:
        return X_NOT_IMPLEMENTED_STRING;
    case X_UNKNOWN:
        return X_UNKNOWN_STRING;
    case X_NONE:
        return X_NONE_STRING;
    case X_DEBUG:
        return X_DEBUG_STRING;
    default:
        return X_UNKNOWN_STRING;
    }
}

void
LogVMessageVerb(MessageType type, int verb, const char *format, va_list args)
{
    const char *type_str;
    char buf[1024];
    const size_t size = sizeof(buf);
    Bool newline;
    size_t len = 0;

    if (inSignalContext) {
        LogVMessageVerbSigSafe(type, verb, format, args);
        return;
    }

    type_str = LogMessageTypeVerbString(type, verb);
    if (!type_str)
        return;

    /* if type_str is not "", prepend it and ' ', to message */
    if (type_str[0] != '\0')
        len += Xscnprintf(&buf[len], size - len, "%s ", type_str);

    if (size - len > 1)
        len += Xvscnprintf(&buf[len], size - len, format, args);

    /* Force '\n' at end of truncated line */
    if (size - len == 1)
        buf[len - 1] = '\n';

    newline = (buf[len - 1] == '\n');
    LogSWrite(verb, buf, len, newline);
}

/* Log message with verbosity level specified. */
void
LogMessageVerb(MessageType type, int verb, const char *format, ...)
{
    va_list ap;

    va_start(ap, format);
    LogVMessageVerb(type, verb, format, ap);
    va_end(ap);
}

/* Log a message with the standard verbosity level of 1. */
void
LogMessage(MessageType type, const char *format, ...)
{
    va_list ap;

    va_start(ap, format);
    LogVMessageVerb(type, 1, format, ap);
    va_end(ap);
}

/* Log a message using only signal safe functions. */
void
LogMessageVerbSigSafe(MessageType type, int verb, const char *format, ...)
{
    va_list ap;
    va_start(ap, format);
    LogVMessageVerbSigSafe(type, verb, format, ap);
    va_end(ap);
}

void
LogVMessageVerbSigSafe(MessageType type, int verb, const char *format, va_list args)
{
    const char *type_str;
    char buf[1024];
    int len;
    Bool newline;

    type_str = LogMessageTypeVerbString(type, verb);
    if (!type_str)
        return;

    /* if type_str is not "", prepend it and ' ', to message */
    if (type_str[0] != '\0') {
        LogSWrite(verb, type_str, strlen_sigsafe(type_str), FALSE);
        LogSWrite(verb, " ", 1, FALSE);
    }

    len = vpnprintf(buf, sizeof(buf), format, args);

    /* Force '\n' at end of truncated line */
    if (sizeof(buf) - len == 1)
        buf[len - 1] = '\n';

    newline = (len > 0 && buf[len - 1] == '\n');
    LogSWrite(verb, buf, len, newline);
}

void
LogVHdrMessageVerb(MessageType type, int verb, const char *msg_format,
                   va_list msg_args, const char *hdr_format, va_list hdr_args)
{
    const char *type_str;
    char buf[1024];
    const size_t size = sizeof(buf);
    Bool newline;
    size_t len = 0;
    int (*vprintf_func)(char *, int, const char* _X_RESTRICT_KYWD f, va_list args)
            _X_ATTRIBUTE_PRINTF(3, 0);
    int (*printf_func)(char *, int, const char* _X_RESTRICT_KYWD f, ...)
            _X_ATTRIBUTE_PRINTF(3, 4);

    type_str = LogMessageTypeVerbString(type, verb);
    if (!type_str)
        return;

    if (inSignalContext) {
        vprintf_func = vpnprintf;
        printf_func = pnprintf;
    } else {
        vprintf_func = Xvscnprintf;
        printf_func = Xscnprintf;
    }

    /* if type_str is not "", prepend it and ' ', to message */
    if (type_str[0] != '\0')
        len += printf_func(&buf[len], size - len, "%s ", type_str);

    if (hdr_format && size - len > 1)
        len += vprintf_func(&buf[len], size - len, hdr_format, hdr_args);

    if (msg_format && size - len > 1)
        len += vprintf_func(&buf[len], size - len, msg_format, msg_args);

    /* Force '\n' at end of truncated line */
    if (size - len == 1)
        buf[len - 1] = '\n';

    newline = (buf[len - 1] == '\n');
    LogSWrite(verb, buf, len, newline);
}

void
LogHdrMessageVerb(MessageType type, int verb, const char *msg_format,
                  va_list msg_args, const char *hdr_format, ...)
{
    va_list hdr_args;

    va_start(hdr_args, hdr_format);
    LogVHdrMessageVerb(type, verb, msg_format, msg_args, hdr_format, hdr_args);
    va_end(hdr_args);
}

void
LogHdrMessage(MessageType type, const char *msg_format, va_list msg_args,
              const char *hdr_format, ...)
{
    va_list hdr_args;

    va_start(hdr_args, hdr_format);
    LogVHdrMessageVerb(type, 1, msg_format, msg_args, hdr_format, hdr_args);
    va_end(hdr_args);
}

void
AbortServer(void)
    _X_NORETURN;

void
AbortServer(void)
{
#ifdef XF86BIGFONT
    XF86BigfontCleanup();
#endif
    CloseWellKnownConnections();
    OsCleanup(TRUE);
    AbortDevices();
    AbortDDX(EXIT_ERR_ABORT);
    fflush(stderr);
    if (CoreDump)
        OsAbort();
    exit(1);
}

#define AUDIT_PREFIX "AUDIT: %s: %ld: "
#ifndef AUDIT_TIMEOUT
#define AUDIT_TIMEOUT ((CARD32)(120 * 1000))    /* 2 mn */
#endif

static int nrepeat = 0;
static int oldlen = -1;
static OsTimerPtr auditTimer = NULL;

void
FreeAuditTimer(void)
{
    if (auditTimer != NULL) {
        /* Force output of pending messages */
        TimerForce(auditTimer);
        TimerFree(auditTimer);
        auditTimer = NULL;
    }
}

static char *
AuditPrefix(void)
{
    time_t tm;
    char *autime, *s;
    char *tmpBuf;
    int len;

    time(&tm);
    autime = ctime(&tm);
    if ((s = strchr(autime, '\n')))
        *s = '\0';
    len = strlen(AUDIT_PREFIX) + strlen(autime) + 10 + 1;
    tmpBuf = malloc(len);
    if (!tmpBuf)
        return NULL;
    snprintf(tmpBuf, len, AUDIT_PREFIX, autime, (unsigned long) getpid());
    return tmpBuf;
}

void
AuditF(const char *f, ...)
{
    va_list args;

    va_start(args, f);

    VAuditF(f, args);
    va_end(args);
}

static CARD32
AuditFlush(OsTimerPtr timer, CARD32 now, void *arg)
{
    char *prefix;

    if (nrepeat > 0) {
        prefix = AuditPrefix();
        ErrorF("%slast message repeated %d times\n",
               prefix != NULL ? prefix : "", nrepeat);
        nrepeat = 0;
        free(prefix);
        return AUDIT_TIMEOUT;
    }
    else {
        /* if the timer expires without anything to print, flush the message */
        oldlen = -1;
        return 0;
    }
}

void
VAuditF(const char *f, va_list args)
{
    char *prefix;
    char buf[1024];
    int len;
    static char oldbuf[1024];

    prefix = AuditPrefix();
    len = vsnprintf(buf, sizeof(buf), f, args);

    if (len == oldlen && strcmp(buf, oldbuf) == 0) {
        /* Message already seen */
        nrepeat++;
    }
    else {
        /* new message */
        if (auditTimer != NULL)
            TimerForce(auditTimer);
        ErrorF("%s%s", prefix != NULL ? prefix : "", buf);
        strncpy(oldbuf, buf, sizeof(oldbuf));
        oldlen = len;
        nrepeat = 0;
        auditTimer = TimerSet(auditTimer, 0, AUDIT_TIMEOUT, AuditFlush, NULL);
    }
    free(prefix);
}

extern char g_FatalErrorMessage[1024];

void
FatalError(const char *f, ...)
{
    va_list args;
    va_list args2;
    static Bool beenhere = FALSE;

    if (beenhere)
        ErrorFSigSafe("\nFatalError re-entered, aborting\n");
    else
        ErrorFSigSafe("\nFatal server error:\n");

    va_start(args, f);

#ifndef _MSC_VER
    /* Make a copy for OsVendorFatalError */
    va_copy(args2, args);
#endif

#ifdef __APPLE__
    {
        va_list apple_args;

        va_copy(apple_args, args);
        (void)vsnprintf(__crashreporter_info_buff__,
                        sizeof(__crashreporter_info_buff__), f, apple_args);
        va_end(apple_args);
    }
#endif
#ifdef WIN32
    vsnprintf(g_FatalErrorMessage, 1024, f, args);
#endif
    VErrorFSigSafe(f, args);
    va_end(args);
    ErrorFSigSafe("\n");
#ifdef _MSC_VER
    va_start(args2, f);
#endif
    if (!beenhere)
        OsVendorFatalError(f, args2);
    va_end(args2);
    if (!beenhere) {
        beenhere = TRUE;
        AbortServer();
    }
    else
        OsAbort();
 /*NOTREACHED*/}

void
VErrorF(const char *f, va_list args)
{
#ifdef DDXOSVERRORF
    if (OsVendorVErrorFProc)
        OsVendorVErrorFProc(f, args);
    else
        LogVWrite(-1, f, args);
#else
    LogVWrite(-1, f, args);
#endif
}

void
ErrorF(const char *f, ...)
{
    va_list args;

    va_start(args, f);
    VErrorF(f, args);
    va_end(args);
}

void
VErrorFSigSafe(const char *f, va_list args)
{
    LogVMessageVerbSigSafe(X_ERROR, -1, f, args);
}

void
ErrorFSigSafe(const char *f, ...)
{
    va_list args;

    va_start(args, f);
    VErrorFSigSafe(f, args);
    va_end(args);
}

void
LogPrintMarkers(void)
{
    /* Show what the message marker symbols mean. */
    LogWrite(0, "Markers: ");
    LogMessageVerb(X_PROBED, 0, "probed, ");
    LogMessageVerb(X_CONFIG, 0, "from config file, ");
    LogMessageVerb(X_DEFAULT, 0, "default setting,\n\t");
    LogMessageVerb(X_CMDLINE, 0, "from command line, ");
    LogMessageVerb(X_NOTICE, 0, "notice, ");
    LogMessageVerb(X_INFO, 0, "informational,\n\t");
    LogMessageVerb(X_WARNING, 0, "warning, ");
    LogMessageVerb(X_ERROR, 0, "error, ");
    LogMessageVerb(X_NOT_IMPLEMENTED, 0, "not implemented, ");
    LogMessageVerb(X_UNKNOWN, 0, "unknown.\n");
}