summaryrefslogtreecommitdiffstats
path: root/server/log.c
blob: c8edf972f33710dcf5f126fbc2f99323de166265 (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
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software
 * originally written at the National Center for Supercomputing Applications,
 * University of Illinois, Urbana-Champaign.
 */

/*
 * http_log.c: Dealing with the logs and errors
 *
 * Rob McCool
 *
 */

#include "apr.h"
#include "apr_general.h"        /* for signal stuff */
#include "apr_strings.h"
#include "apr_errno.h"
#include "apr_thread_proc.h"
#include "apr_lib.h"
#include "apr_signal.h"

#define APR_WANT_STDIO
#define APR_WANT_STRFUNC
#include "apr_want.h"

#if APR_HAVE_STDARG_H
#include <stdarg.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif

#define CORE_PRIVATE

#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_main.h"

typedef struct {
    char    *t_name;
    int      t_val;
} TRANS;

APR_HOOK_STRUCT(
    APR_HOOK_LINK(error_log)
)

int AP_DECLARE_DATA ap_default_loglevel = DEFAULT_LOGLEVEL;

#ifdef HAVE_SYSLOG

static const TRANS facilities[] = {
    {"auth",    LOG_AUTH},
#ifdef LOG_AUTHPRIV
    {"authpriv",LOG_AUTHPRIV},
#endif
#ifdef LOG_CRON
    {"cron",    LOG_CRON},
#endif
#ifdef LOG_DAEMON
    {"daemon",  LOG_DAEMON},
#endif
#ifdef LOG_FTP
    {"ftp", LOG_FTP},
#endif
#ifdef LOG_KERN
    {"kern",    LOG_KERN},
#endif
#ifdef LOG_LPR
    {"lpr", LOG_LPR},
#endif
#ifdef LOG_MAIL
    {"mail",    LOG_MAIL},
#endif
#ifdef LOG_NEWS
    {"news",    LOG_NEWS},
#endif
#ifdef LOG_SYSLOG
    {"syslog",  LOG_SYSLOG},
#endif
#ifdef LOG_USER
    {"user",    LOG_USER},
#endif
#ifdef LOG_UUCP
    {"uucp",    LOG_UUCP},
#endif
#ifdef LOG_LOCAL0
    {"local0",  LOG_LOCAL0},
#endif
#ifdef LOG_LOCAL1
    {"local1",  LOG_LOCAL1},
#endif
#ifdef LOG_LOCAL2
    {"local2",  LOG_LOCAL2},
#endif
#ifdef LOG_LOCAL3
    {"local3",  LOG_LOCAL3},
#endif
#ifdef LOG_LOCAL4
    {"local4",  LOG_LOCAL4},
#endif
#ifdef LOG_LOCAL5
    {"local5",  LOG_LOCAL5},
#endif
#ifdef LOG_LOCAL6
    {"local6",  LOG_LOCAL6},
#endif
#ifdef LOG_LOCAL7
    {"local7",  LOG_LOCAL7},
#endif
    {NULL,      -1},
};
#endif

static const TRANS priorities[] = {
    {"emerg",   APLOG_EMERG},
    {"alert",   APLOG_ALERT},
    {"crit",    APLOG_CRIT},
    {"error",   APLOG_ERR},
    {"warn",    APLOG_WARNING},
    {"notice",  APLOG_NOTICE},
    {"info",    APLOG_INFO},
    {"debug",   APLOG_DEBUG},
    {NULL,      -1},
};

static apr_file_t *stderr_log = NULL;

AP_DECLARE(void) ap_open_stderr_log(apr_pool_t *p)
{
    apr_file_open_stderr(&stderr_log, p);
}

static int log_child(apr_pool_t *p, const char *progname,
                     apr_file_t **fpin)
{
    /* Child process code for 'ErrorLog "|..."';
     * may want a common framework for this, since I expect it will
     * be common for other foo-loggers to want this sort of thing...
     */
    apr_status_t rc;
    apr_procattr_t *procattr;
    apr_proc_t *procnew;

    if (((rc = apr_procattr_create(&procattr, p)) == APR_SUCCESS)
        && ((rc = apr_procattr_io_set(procattr,
                                      APR_FULL_BLOCK,
                                      APR_NO_PIPE,
                                      APR_NO_PIPE)) == APR_SUCCESS)) {
        char **args;
        const char *pname;

        apr_tokenize_to_argv(progname, &args, p);
        pname = apr_pstrdup(p, args[0]);
        procnew = (apr_proc_t *)apr_pcalloc(p, sizeof(*procnew));
        rc = apr_proc_create(procnew, pname, (const char * const *)args,
                             NULL, procattr, p);

        if (rc == APR_SUCCESS) {
            apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
            (*fpin) = procnew->in;
        }
    }

    return rc;
}

static void open_error_log(server_rec *s, apr_pool_t *p)
{
    const char *fname;
    int rc;

    if (*s->error_fname == '|') {
        apr_file_t *dummy = NULL;

        /* This starts a new process... */
        rc = log_child (p, s->error_fname + 1, &dummy);
        if (rc != APR_SUCCESS) {
            ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
                         "Couldn't start ErrorLog process");
            exit(1);
        }

        s->error_log = dummy;
    }

#ifdef HAVE_SYSLOG
    else if (!strncasecmp(s->error_fname, "syslog", 6)) {
        if ((fname = strchr(s->error_fname, ':'))) {
            const TRANS *fac;

            fname++;
            for (fac = facilities; fac->t_name; fac++) {
                if (!strcasecmp(fname, fac->t_name)) {
                    openlog(ap_server_argv0, LOG_NDELAY|LOG_CONS|LOG_PID,
                            fac->t_val);
                    s->error_log = NULL;
                    return;
                }
            }
        }
        else {
            openlog(ap_server_argv0, LOG_NDELAY|LOG_CONS|LOG_PID, LOG_LOCAL7);
        }

        s->error_log = NULL;
    }
#endif
    else {
        fname = ap_server_root_relative(p, s->error_fname);
        rc = apr_file_open(&s->error_log, fname,
                           APR_APPEND | APR_READ | APR_WRITE | APR_CREATE,
                           APR_OS_DEFAULT, p);
        if (rc != APR_SUCCESS) {
            ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
                         "%s: could not open error log file %s.",
            ap_server_argv0, fname);
            exit(1);
        }

        apr_file_set_inherit(s->error_log);
    }
}

void ap_open_logs(server_rec *s_main, apr_pool_t *p)
{
    apr_status_t rc = APR_SUCCESS;
    server_rec *virt, *q;
    int replace_stderr;
    apr_file_t *errfile = NULL;

    open_error_log(s_main, p);

    replace_stderr = 1;
    if (s_main->error_log) {
        /* replace stderr with this new log */
        apr_file_flush(s_main->error_log);
        if ((rc = apr_file_open_stderr(&errfile, p)) == APR_SUCCESS) {
            rc = apr_file_dup2(errfile, s_main->error_log, p);
        }
        if (rc != APR_SUCCESS) {
            ap_log_error(APLOG_MARK, APLOG_CRIT, rc, s_main,
                         "unable to replace stderr with error_log");
        }
        else {
            replace_stderr = 0;
        }
    }
    /* note that stderr may still need to be replaced with something
     * because it points to the old error log, or back to the tty
     * of the submitter.
     * XXX: This is BS - /dev/null is non-portable
     */
    if (replace_stderr && freopen("/dev/null", "w", stderr) == NULL) {
        ap_log_error(APLOG_MARK, APLOG_CRIT, errno, s_main,
                     "unable to replace stderr with /dev/null");
    }

    for (virt = s_main->next; virt; virt = virt->next) {
        if (virt->error_fname) {
            for (q=s_main; q != virt; q = q->next) {
                if (q->error_fname != NULL
                    && strcmp(q->error_fname, virt->error_fname) == 0) {
                    break;
                }
            }

            if (q == virt) {
                open_error_log(virt, p);
            }
            else {
                virt->error_log = q->error_log;
            }
        }
        else {
            virt->error_log = s_main->error_log;
        }
    }
}

AP_DECLARE(void) ap_error_log2stderr(server_rec *s) {
    apr_file_t *errfile = NULL;

    apr_file_open_stderr(&errfile, s->process->pool);
    if (s->error_log != NULL) {
        apr_file_dup2(s->error_log, errfile, s->process->pool);
    }
}

static void log_error_core(const char *file, int line, int level,
                           apr_status_t status, const server_rec *s,
                           const request_rec *r, apr_pool_t *pool,
                           const char *fmt, va_list args)
{
    char errstr[MAX_STRING_LEN];
    size_t len, errstrlen;
    apr_file_t *logf = NULL;
    const char *referer;
    int level_and_mask = level & APLOG_LEVELMASK;

    if (s == NULL) {
        /*
         * If we are doing stderr logging (startup), don't log messages that are
         * above the default server log level unless it is a startup/shutdown
         * notice
         */
        if ((level_and_mask != APLOG_NOTICE)
            && (level_and_mask > ap_default_loglevel)) {
            return;
        }

        logf = stderr_log;
    }
    else if (s->error_log) {
        /*
         * If we are doing normal logging, don't log messages that are
         * above the server log level unless it is a startup/shutdown notice
         */
        if ((level_and_mask != APLOG_NOTICE)
            && (level_and_mask > s->loglevel)) {
            return;
        }

        logf = s->error_log;
    }
#ifdef TPF
    else if (tpf_child) {
        /*
         * If we are doing normal logging, don't log messages that are
         * above the server log level unless it is a startup/shutdown notice
         */
        if ((level_and_mask != APLOG_NOTICE)
            && (level_and_mask > s->loglevel)) {
            return;
        }

        logf = stderr;
    }
#endif /* TPF */
    else {
        /*
         * If we are doing syslog logging, don't log messages that are
         * above the server log level (including a startup/shutdown notice)
         */
        if (level_and_mask > s->loglevel) {
            return;
        }
    }

    if (logf && ((level & APLOG_STARTUP) != APLOG_STARTUP)) {
        errstr[0] = '[';
        apr_ctime(errstr + 1, apr_time_now());
        errstr[1 + APR_CTIME_LEN - 1] = ']';
        errstr[1 + APR_CTIME_LEN    ] = ' ';
        len = 1 + APR_CTIME_LEN + 1;
    } else {
        len = 0;
    }

    if ((level & APLOG_STARTUP) != APLOG_STARTUP) {
        len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
                            "[%s] ", priorities[level_and_mask].t_name);
    }

#ifndef TPF
    if (file && level_and_mask == APLOG_DEBUG) {
#ifdef _OSD_POSIX
        char tmp[256];
        char *e = strrchr(file, '/');

        /* In OSD/POSIX, the compiler returns for __FILE__
         * a string like: __FILE__="*POSIX(/usr/include/stdio.h)"
         * (it even returns an absolute path for sources in
         * the current directory). Here we try to strip this
         * down to the basename.
         */
        if (e != NULL && e[1] != '\0') {
            apr_snprintf(tmp, sizeof(tmp), "%s", &e[1]);
            e = &tmp[strlen(tmp)-1];
            if (*e == ')') {
                *e = '\0';
            }
            file = tmp;
        }
#endif /*_OSD_POSIX*/
        len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
                            "%s(%d): ", file, line);
    }
#endif /* TPF */

    if (r && r->connection) {
        /* XXX: TODO: add a method of selecting whether logged client
         * addresses are in dotted quad or resolved form... dotted
         * quad is the most secure, which is why I'm implementing it
         * first. -djg
         */
        len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
                            "[client %s] ", r->connection->remote_ip);
    }
    if (!(level & APLOG_NOERRNO) && (status != 0)) {
        char buf[120];
        len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
                            "(%d)%s: ", status,
                            apr_strerror(status, buf, sizeof(buf)));
    }
    errstrlen = len;
    len += apr_vsnprintf(errstr + len, MAX_STRING_LEN - len, fmt, args);

    if (r && (referer = apr_table_get(r->headers_in, "Referer"))) {
        len += apr_snprintf(errstr + len, MAX_STRING_LEN - len,
                            ", referer: %s", referer);
    }

    /* NULL if we are logging to syslog */
    if (logf) {
        /* Truncate for the terminator (as apr_snprintf does) */
        if (len > MAX_STRING_LEN - sizeof(APR_EOL_STR)) {
            len = MAX_STRING_LEN - sizeof(APR_EOL_STR);
        }
        strcpy(errstr + len, APR_EOL_STR);
        apr_file_puts(errstr, logf);
        apr_file_flush(logf);
    }
#ifdef HAVE_SYSLOG
    else {
        syslog(level_and_mask, "%s", errstr);
    }
#endif

    ap_run_error_log(file, line, level, status, s, r, pool, errstr + errstrlen);
}

AP_DECLARE(void) ap_log_error(const char *file, int line, int level,
                              apr_status_t status, const server_rec *s,
                              const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    log_error_core(file, line, level, status, s, NULL, NULL, fmt, args);
    va_end(args);
}

AP_DECLARE(void) ap_log_perror(const char *file, int line, int level,
                               apr_status_t status, apr_pool_t *p,
                               const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    log_error_core(file, line, level, status, NULL, NULL, p, fmt, args);
    va_end(args);
}

AP_DECLARE(void) ap_log_rerror(const char *file, int line, int level,
                               apr_status_t status, const request_rec *r,
                               const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    log_error_core(file, line, level, status, r->server, r, NULL, fmt, args);

    /*
     * IF the error level is 'warning' or more severe,
     * AND there isn't already error text associated with this request,
     * THEN make the message text available to ErrorDocument and
     * other error processors.  This can be disabled by stuffing
     * something, even an empty string, into the "error-notes" cell
     * before calling this routine.
     */
    va_end(args);
    va_start(args,fmt);
    if (((level & APLOG_LEVELMASK) <= APLOG_WARNING)
        && (apr_table_get(r->notes, "error-notes") == NULL)) {
        apr_table_setn(r->notes, "error-notes",
                       ap_escape_html(r->pool, apr_pvsprintf(r->pool, fmt,
                                                             args)));
    }
    va_end(args);
}

AP_DECLARE(void) ap_log_pid(apr_pool_t *p, const char *fname)
{
    apr_file_t *pid_file = NULL;
    apr_finfo_t finfo;
    static pid_t saved_pid = -1;
    pid_t mypid;
    apr_status_t rv;

    if (!fname)
    return;

    fname = ap_server_root_relative(p, fname);
    mypid = getpid();
    if (mypid != saved_pid
        && apr_stat(&finfo, fname, APR_FINFO_MTIME, p) == APR_SUCCESS) {
        /* AP_SIG_GRACEFUL and HUP call this on each restart.
         * Only warn on first time through for this pid.
         *
         * XXX: Could just write first time through too, although
         *      that may screw up scripts written to do something
         *      based on the last modification time of the pid file.
         */
        ap_log_perror(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, p,
                      apr_psprintf(p, "pid file %s overwritten -- Unclean "
                                   "shutdown of previous Apache run?",
                                   fname));
    }

    if ((rv = apr_file_open(&pid_file, fname,
                            APR_WRITE | APR_CREATE | APR_TRUNCATE,
                            APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD, p))
        != APR_SUCCESS) {
        ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL,
                     "could not create %s", fname);
        ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, NULL,
                     "%s: could not log pid to file %s",
                     ap_server_argv0, fname);
        exit(1);
    }
    apr_file_printf(pid_file, "%ld" APR_EOL_STR, (long)mypid);
    apr_file_close(pid_file);
    saved_pid = mypid;
}

AP_DECLARE(void) ap_log_assert(const char *szExp, const char *szFile,
                               int nLine)
{
    char time_str[APR_CTIME_LEN];

    apr_ctime(time_str, apr_time_now());
    ap_log_error(APLOG_MARK, APLOG_CRIT | APLOG_NOERRNO, 0, NULL,
                 "[%s] file %s, line %d, assertion \"%s\" failed",
                 time_str, szFile, nLine, szExp);
#if defined(WIN32)
    DebugBreak();
#else
    /* unix assert does an abort leading to a core dump */
    abort();
#endif
}

/* piped log support */

#ifdef AP_HAVE_RELIABLE_PIPED_LOGS
/* forward declaration */
static void piped_log_maintenance(int reason, void *data, apr_wait_t status);

static int piped_log_spawn(piped_log *pl)
{
    int rc;
    apr_procattr_t *procattr;
    apr_proc_t *procnew = NULL;
    apr_status_t status;

    if (((status = apr_procattr_create(&procattr, pl->p)) != APR_SUCCESS) ||
        ((status = apr_procattr_child_in_set(procattr,
                                             ap_piped_log_read_fd(pl),
                                             ap_piped_log_write_fd(pl)))
        != APR_SUCCESS)) {
        char buf[120];
        /* Something bad happened, give up and go away. */
        ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                     "piped_log_spawn: unable to setup child process '%s': %s",
                     pl->program, apr_strerror(status, buf, sizeof(buf)));
        rc = -1;
    }
    else {
        char **args;
        const char *pname;

        apr_tokenize_to_argv(pl->program, &args, pl->p);
        pname = apr_pstrdup(pl->p, args[0]);
        procnew = apr_pcalloc(pl->p, sizeof(apr_proc_t));
        rc = apr_proc_create(procnew, pname, (const char * const *) args,
                             NULL, procattr, pl->p);

        if (rc == APR_SUCCESS) {
            /* pjr - This no longer happens inside the child, */
            /*   I am assuming that if apr_proc_create was  */
            /*   successful that the child is running.        */
            RAISE_SIGSTOP(PIPED_LOG_SPAWN);
            pl->pid = procnew;
            ap_piped_log_write_fd(pl) = procnew->in;
            apr_proc_other_child_register(procnew, piped_log_maintenance, pl,
                                          ap_piped_log_write_fd(pl), pl->p);
        }
    }

    return 0;
}


static void piped_log_maintenance(int reason, void *data, apr_wait_t status)
{
    piped_log *pl = data;
    apr_status_t stats;

    switch (reason) {
    case APR_OC_REASON_DEATH:
        pl->pid = NULL;
        apr_proc_other_child_unregister(pl);
        if (pl->program == NULL) {
            /* during a restart */
            break;
        }
        break;
    case APR_OC_REASON_LOST:
        pl->pid = NULL;
        apr_proc_other_child_unregister(pl);
        if (pl->program == NULL) {
            /* during a restart */
            break;
        }
        if ((stats = piped_log_spawn(pl)) != APR_SUCCESS) {
            /* what can we do?  This could be the error log we're having
             * problems opening up... */
            char buf[120];
            ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
                         "piped_log_maintenance: unable to respawn '%s': %s",
                         pl->program, apr_strerror(stats, buf, sizeof(buf)));
        }
        break;

    case APR_OC_REASON_UNWRITABLE:
        /* We should not kill off the pipe here, since it may only be full.
         * If it really is locked, we should kill it off manually. */
    break;

    case APR_OC_REASON_RESTART:
        pl->program = NULL;
        if (pl->pid != NULL) {
            apr_proc_kill(pl->pid, SIGTERM);
        }
        break;

    case APR_OC_REASON_UNREGISTER:
        break;
    }
}


static apr_status_t piped_log_cleanup_for_exec(void *data)
{
    piped_log *pl = data;

    apr_file_close(ap_piped_log_read_fd(pl));
    apr_file_close(ap_piped_log_write_fd(pl));
    return APR_SUCCESS;
}


static apr_status_t piped_log_cleanup(void *data)
{
    piped_log *pl = data;

    if (pl->pid != NULL) {
        apr_proc_kill(pl->pid, SIGTERM);
    }
    return piped_log_cleanup_for_exec(data);
}


AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p, const char *program)
{
    piped_log *pl;

    pl = apr_palloc(p, sizeof (*pl));
    pl->p = p;
    pl->program = apr_pstrdup(p, program);
    pl->pid = NULL;
    if (apr_file_pipe_create(&ap_piped_log_read_fd(pl),
                             &ap_piped_log_write_fd(pl), p) != APR_SUCCESS) {
        return NULL;
    }
    apr_pool_cleanup_register(p, pl, piped_log_cleanup,
                              piped_log_cleanup_for_exec);
    if (piped_log_spawn(pl) == -1) {
        int save_errno = errno;
        apr_pool_cleanup_kill(p, pl, piped_log_cleanup);
        apr_file_close(ap_piped_log_read_fd(pl));
        apr_file_close(ap_piped_log_write_fd(pl));
        errno = save_errno;
        return NULL;
    }
    return pl;
}

#else /* !AP_HAVE_RELIABLE_PIPED_LOGS */

static apr_status_t piped_log_cleanup(void *data)
{
    piped_log *pl = data;

    apr_file_close(ap_piped_log_write_fd(pl));
    return APR_SUCCESS;
}

AP_DECLARE(piped_log *) ap_open_piped_log(apr_pool_t *p, const char *program)
{
    piped_log *pl;
    apr_file_t *dummy = NULL;
    int rc;

    rc = log_child(p, program, &dummy);
    if (rc != APR_SUCCESS) {
        ap_log_error(APLOG_MARK, APLOG_STARTUP, rc, NULL,
                     "Couldn't start piped log process");
        exit (1);
    }

    pl = apr_palloc(p, sizeof (*pl));
    pl->p = p;
    ap_piped_log_read_fd(pl) = NULL;
    ap_piped_log_write_fd(pl) = dummy;
    apr_pool_cleanup_register(p, pl, piped_log_cleanup, piped_log_cleanup);

    return pl;
}

#endif

AP_DECLARE(void) ap_close_piped_log(piped_log *pl)
{
    apr_pool_cleanup_run(pl->p, pl, piped_log_cleanup);
}

AP_IMPLEMENT_HOOK_VOID(error_log,
                       (const char *file, int line, int level,
                        apr_status_t status, const server_rec *s,
                        const request_rec *r, apr_pool_t *pool,
                        const char *errstr), (file, line, level,
                        status, s, r, pool, errstr))