Adding upstream version 2.4.38.upstream/2.4.38

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1829 insertions, 0 deletions

diff --git a/support/htcacheclean.c b/support/htcacheclean.c
new file mode 100644
index 0000000..8692377
--- /dev/null
+++ b/support/htcacheclean.c
@@ -0,0 +1,1829 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * htcacheclean.c: simple program for cleaning of
+ * the disk cache of the Apache HTTP server
+ *
+ * Contributed by Andreas Steinmetz <ast domdv.de>
+ * 8 Oct 2004
+ */
+
+#include "apr.h"
+#include "apr_lib.h"
+#include "apr_strings.h"
+#include "apr_file_io.h"
+#include "apr_file_info.h"
+#include "apr_pools.h"
+#include "apr_hash.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+#include "apr_getopt.h"
+#include "apr_md5.h"
+#include "apr_ring.h"
+#include "apr_date.h"
+#include "apr_buckets.h"
+
+#include "../modules/cache/cache_common.h"
+#include "../modules/cache/cache_disk_common.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+/* define the following for debugging */
+#undef DEBUG
+
+/*
+ * Note: on Linux delays <= 2ms are busy waits without
+ *       scheduling, so never use a delay <= 2ms below
+ */
+
+#define NICE_DELAY    10000     /* usecs */
+#define DELETE_NICE   10        /* be nice after this amount of delete ops */
+#define STAT_ATTEMPTS 10        /* maximum stat attempts for a file */
+#define STAT_DELAY    5000      /* usecs */
+#define HEADER        1         /* headers file */
+#define DATA          2         /* body file */
+#define TEMP          4         /* temporary file */
+#define HEADERDATA    (HEADER|DATA)
+#define MAXDEVIATION  3600      /* secs */
+#define SECS_PER_MIN  60
+#define KBYTE         1024
+#define MBYTE         1048576
+#define GBYTE         1073741824
+
+#define DIRINFO (APR_FINFO_MTIME|APR_FINFO_SIZE|APR_FINFO_TYPE|APR_FINFO_LINK)
+
+typedef struct _direntry {
+    APR_RING_ENTRY(_direntry) link;
+    int type;         /* type of file/fileset: TEMP, HEADER, DATA, HEADERDATA */
+    apr_time_t htime; /* headers file modification time */
+    apr_time_t dtime; /* body file modification time */
+    apr_off_t hsize;  /* headers file size */
+    apr_off_t dsize;  /* body or temporary file size */
+    char *basename;   /* file/fileset base name */
+} DIRENTRY;
+
+typedef struct _entry {
+    APR_RING_ENTRY(_entry) link;
+    apr_time_t expire;        /* cache entry exiration time */
+    apr_time_t response_time; /* cache entry time of last response to client */
+    apr_time_t htime;         /* headers file modification time */
+    apr_time_t dtime;         /* body file modification time */
+    apr_off_t hsize;          /* headers file size */
+    apr_off_t dsize;          /* body or temporary file size */
+    char *basename;           /* fileset base name */
+} ENTRY;
+
+
+static int delcount;    /* file deletion count for nice mode */
+static int interrupted; /* flag: true if SIGINT or SIGTERM occurred */
+static int realclean;   /* flag: true means user said apache is not running */
+static int verbose;     /* flag: true means print statistics */
+static int benice;      /* flag: true means nice mode is activated */
+static int dryrun;      /* flag: true means dry run, don't actually delete
+                                 anything */
+static int deldirs;     /* flag: true means directories should be deleted */
+static int listurls;    /* flag: true means list cached urls */
+static int listextended;/* flag: true means list cached urls */
+static int baselen;     /* string length of the path to the proxy directory */
+static apr_time_t now;  /* start time of this processing run */
+
+static apr_file_t *errfile;   /* stderr file handle */
+static apr_file_t *outfile;   /* stdout file handle */
+static apr_off_t unsolicited; /* file size summary for deleted unsolicited
+                                 files */
+static APR_RING_ENTRY(_entry) root; /* ENTRY ring anchor */
+
+/* short program name as called */
+static const char *shortname = "htcacheclean";
+
+/* what did we clean? */
+struct stats {
+    apr_off_t total;
+    apr_off_t sum;
+    apr_off_t max;
+    apr_off_t ntotal;
+    apr_off_t nodes;
+    apr_off_t inodes;
+    apr_off_t etotal;
+    apr_off_t entries;
+    apr_off_t dfuture;
+    apr_off_t dexpired;
+    apr_off_t dfresh;
+};
+
+
+#ifdef DEBUG
+/*
+ * fake delete for debug purposes
+ */
+#define apr_file_remove fake_file_remove
+static void fake_file_remove(char *pathname, apr_pool_t *p)
+{
+    apr_finfo_t info;
+
+    /* stat and printing to simulate some deletion system load and to
+       display what would actually have happened */
+    apr_stat(&info, pathname, DIRINFO, p);
+    apr_file_printf(errfile, "would delete %s" APR_EOL_STR, pathname);
+}
+#endif
+
+/*
+ * called on SIGINT or SIGTERM
+ */
+static void setterm(int unused)
+{
+#ifdef DEBUG
+    apr_file_printf(errfile, "interrupt" APR_EOL_STR);
+#endif
+    interrupted = 1;
+}
+
+/*
+ * called in out of memory condition
+ */
+static int oom(int unused)
+{
+    static int called = 0;
+
+    /* be careful to call exit() only once */
+    if (!called) {
+        called = 1;
+        exit(1);
+    }
+    return APR_ENOMEM;
+}
+
+/*
+ * print purge statistics
+ */
+static void printstats(char *path, struct stats *s)
+{
+    char ttype, stype, mtype, utype;
+    apr_off_t tfrag, sfrag, ufrag;
+
+    if (!verbose) {
+        return;
+    }
+
+    ttype = 'K';
+    tfrag = ((s->total * 10) / KBYTE) % 10;
+    s->total /= KBYTE;
+    if (s->total >= KBYTE) {
+        ttype = 'M';
+        tfrag = ((s->total * 10) / KBYTE) % 10;
+        s->total /= KBYTE;
+    }
+
+    stype = 'K';
+    sfrag = ((s->sum * 10) / KBYTE) % 10;
+    s->sum /= KBYTE;
+    if (s->sum >= KBYTE) {
+        stype = 'M';
+        sfrag = ((s->sum * 10) / KBYTE) % 10;
+        s->sum /= KBYTE;
+    }
+
+    mtype = 'K';
+    s->max /= KBYTE;
+    if (s->max >= KBYTE) {
+        mtype = 'M';
+        s->max /= KBYTE;
+    }
+
+    apr_file_printf(errfile, "Cleaned %s. Statistics:" APR_EOL_STR, path);
+    if (unsolicited) {
+        utype = 'K';
+        ufrag = ((unsolicited * 10) / KBYTE) % 10;
+        unsolicited /= KBYTE;
+        if (unsolicited >= KBYTE) {
+            utype = 'M';
+            ufrag = ((unsolicited * 10) / KBYTE) % 10;
+            unsolicited /= KBYTE;
+        }
+        if (!unsolicited && !ufrag) {
+            ufrag = 1;
+        }
+        apr_file_printf(errfile, "unsolicited size %d.%d%c" APR_EOL_STR,
+                        (int)(unsolicited), (int)(ufrag), utype);
+    }
+    apr_file_printf(errfile, "size limit %" APR_OFF_T_FMT ".0%c" APR_EOL_STR,
+            s->max, mtype);
+    apr_file_printf(errfile, "inodes limit %" APR_OFF_T_FMT APR_EOL_STR,
+            s->inodes);
+    apr_file_printf(
+            errfile,
+            "total size was %" APR_OFF_T_FMT ".%" APR_OFF_T_FMT "%c, total size now "
+            "%" APR_OFF_T_FMT ".%" APR_OFF_T_FMT "%c" APR_EOL_STR, s->total,
+            tfrag, ttype, s->sum, sfrag, stype);
+    apr_file_printf(errfile, "total inodes was %" APR_OFF_T_FMT
+            ", total %sinodes now "
+            "%" APR_OFF_T_FMT APR_EOL_STR, s->ntotal, dryrun && deldirs ? "estimated "
+            : "", s->nodes);
+    apr_file_printf(
+            errfile,
+            "total entries was %" APR_OFF_T_FMT ", total entries now %" APR_OFF_T_FMT
+            APR_EOL_STR, s->etotal, s->entries);
+    apr_file_printf(
+            errfile,
+            "%" APR_OFF_T_FMT " entries deleted (%" APR_OFF_T_FMT " from future, %"
+            APR_OFF_T_FMT " expired, %" APR_OFF_T_FMT " fresh)" APR_EOL_STR,
+            (s->etotal - s->entries), s->dfuture, s->dexpired, s->dfresh);
+}
+
+/**
+ * Round the value up to the given threshold.
+ */
+static apr_size_t round_up(apr_size_t val, apr_off_t round) {
+    if (round > 1) {
+        return (apr_size_t)(((val + round - 1) / round) * round);
+    }
+    return val;
+}
+
+/*
+ * delete parent directories
+ */
+static void delete_parent(const char *path, const char *basename,
+        apr_off_t *nodes, apr_pool_t *pool)
+{
+    char *nextpath, *name;
+    apr_pool_t *p;
+
+    /* temp pool, otherwise lots of memory could be allocated */
+    apr_pool_create(&p, pool);
+    name = apr_pstrdup(p, basename);
+
+    /* If asked to delete dirs, do so now. We don't care if it fails.
+     * If it fails, it likely means there was something else there.
+     */
+    if (deldirs && !dryrun) {
+        const char *vary;
+        char *end = strrchr(name, '/');
+        while (end) {
+            *end = 0;
+
+            /* remove the directory */
+            nextpath = apr_pstrcat(p, path, "/", name, NULL);
+            if (!apr_dir_remove(nextpath, p)) {
+                (*nodes)--;
+
+                /* vary directory found? */
+                vary = strstr(name, CACHE_VDIR_SUFFIX);
+                if (vary && !vary[sizeof(CACHE_VDIR_SUFFIX) - 1]) {
+                    nextpath = apr_pstrcat(p, path, "/", apr_pstrndup(p, name, vary
+                            - name), NULL);
+                    if (!apr_file_remove(nextpath, p)) {
+                        (*nodes)--;
+                    }
+                }
+
+            }
+            else {
+                break;
+            }
+            end = strrchr(name, '/');
+        }
+    }
+
+    apr_pool_destroy(p);
+
+    if (benice) {
+        if (++delcount >= DELETE_NICE) {
+            apr_sleep(NICE_DELAY);
+            delcount = 0;
+        }
+    }
+
+}
+
+/*
+ * delete a single file
+ */
+static void delete_file(char *path, char *basename, apr_off_t *nodes,
+        apr_pool_t *pool)
+{
+    char *nextpath;
+    apr_pool_t *p;
+
+    /* temp pool, otherwise lots of memory could be allocated */
+    apr_pool_create(&p, pool);
+    nextpath = apr_pstrcat(p, path, "/", basename, NULL);
+
+    if (dryrun) {
+        apr_finfo_t finfo;
+        if (!apr_stat(&finfo, nextpath, APR_FINFO_NLINK, p)) {
+            (*nodes)--;
+        }
+    }
+    else if (!apr_file_remove(nextpath, p)) {
+        (*nodes)--;
+    }
+
+    apr_pool_destroy(p);
+
+    if (benice) {
+        if (++delcount >= DELETE_NICE) {
+            apr_sleep(NICE_DELAY);
+            delcount = 0;
+        }
+    }
+
+    delete_parent(path, basename, nodes, pool);
+
+}
+
+/*
+ * delete cache file set
+ */
+static void delete_entry(char *path, char *basename, apr_off_t *nodes,
+        apr_pool_t *pool)
+{
+    char *nextpath;
+    apr_pool_t *p;
+
+    /* temp pool, otherwise lots of memory could be allocated */
+    apr_pool_create(&p, pool);
+
+    nextpath = apr_pstrcat(p, path, "/", basename, CACHE_HEADER_SUFFIX, NULL);
+    if (dryrun) {
+        apr_finfo_t finfo;
+        if (!apr_stat(&finfo, nextpath, APR_FINFO_NLINK, p)) {
+            (*nodes)--;
+        }
+    }
+    else if (!apr_file_remove(nextpath, p)) {
+        (*nodes)--;
+    }
+
+    nextpath = apr_pstrcat(p, path, "/", basename, CACHE_DATA_SUFFIX, NULL);
+    if (dryrun) {
+        apr_finfo_t finfo;
+        if (!apr_stat(&finfo, nextpath, APR_FINFO_NLINK, p)) {
+            (*nodes)--;
+        }
+    }
+    else if (!apr_file_remove(nextpath, p)) {
+        (*nodes)--;
+    }
+
+    apr_pool_destroy(p);
+
+    if (benice) {
+        delcount += 2;
+        if (delcount >= DELETE_NICE) {
+            apr_sleep(NICE_DELAY);
+            delcount = 0;
+        }
+    }
+
+    delete_parent(path, basename, nodes, pool);
+
+}
+
+/*
+ * list the cache directory tree
+ */
+static int list_urls(char *path, apr_pool_t *pool, apr_off_t round)
+{
+    apr_dir_t *dir;
+    apr_finfo_t info;
+    apr_size_t len;
+    apr_pool_t *p;
+    apr_file_t *fd;
+    const char *ext, *nextpath;
+    char *url;
+    apr_uint32_t format;
+    disk_cache_info_t disk_info;
+
+    apr_pool_create(&p, pool);
+
+    if (apr_dir_open(&dir, path, p) != APR_SUCCESS) {
+        return 1;
+    }
+
+    while (apr_dir_read(&info, APR_FINFO_TYPE, dir) == APR_SUCCESS && !interrupted) {
+
+        if (info.filetype == APR_DIR) {
+            if (!strcmp(info.name, ".") || !strcmp(info.name, "..")) {
+                continue;
+            }
+
+            if (list_urls(apr_pstrcat(p, path, "/", info.name, NULL), pool, round)) {
+                return 1;
+            }
+        }
+
+        else if (info.filetype == APR_REG) {
+
+            ext = strchr(info.name, '.');
+
+            if (ext && !strcasecmp(ext, CACHE_HEADER_SUFFIX)) {
+
+                nextpath = apr_pstrcat(p, path, "/", info.name, NULL);
+
+                if (apr_file_open(&fd, nextpath, APR_FOPEN_READ
+                        | APR_FOPEN_BINARY, APR_OS_DEFAULT, p) == APR_SUCCESS) {
+                    len = sizeof(format);
+                    if (apr_file_read_full(fd, &format, len, &len)
+                            == APR_SUCCESS) {
+                        if (format == DISK_FORMAT_VERSION) {
+                            apr_off_t offset = 0;
+
+                            apr_file_seek(fd, APR_SET, &offset);
+
+                            len = sizeof(disk_cache_info_t);
+
+                            if (apr_file_read_full(fd, &disk_info, len, &len)
+                                    == APR_SUCCESS) {
+                                len = disk_info.name_len;
+                                url = apr_palloc(p, len + 1);
+                                url[len] = 0;
+
+                                if (apr_file_read_full(fd, url, len, &len)
+                                        == APR_SUCCESS) {
+
+                                    if (listextended) {
+                                        apr_finfo_t hinfo, dinfo;
+
+                                        /* stat the header file */
+                                        if (APR_SUCCESS != apr_file_info_get(
+                                                &hinfo, APR_FINFO_SIZE, fd)) {
+                                            /* ignore the file */
+                                        }
+                                        else if (disk_info.has_body && APR_SUCCESS
+                                                != apr_stat(
+                                                        &dinfo,
+                                                        apr_pstrcat(
+                                                                p,
+                                                                path,
+                                                                "/",
+                                                                apr_pstrndup(
+                                                                        p,
+                                                                        info.name,
+                                                                        ext
+                                                                                - info.name),
+                                                                CACHE_DATA_SUFFIX,
+                                                                NULL),
+                                                        APR_FINFO_SIZE
+                                                                | APR_FINFO_IDENT,
+                                                        p)) {
+                                            /* ignore the file */
+                                        }
+                                        else if (disk_info.has_body && (dinfo.device
+                                                != disk_info.device
+                                                || dinfo.inode
+                                                        != disk_info.inode)) {
+                                            /* ignore the file */
+                                        }
+                                        else {
+
+                                            apr_file_printf(
+                                                    outfile,
+                                                    "%s %" APR_SIZE_T_FMT
+                                                    " %" APR_SIZE_T_FMT
+                                                    " %d %" APR_SIZE_T_FMT
+                                                    " %" APR_TIME_T_FMT
+                                                    " %" APR_TIME_T_FMT
+                                                    " %" APR_TIME_T_FMT
+                                                    " %" APR_TIME_T_FMT
+                                                    " %d %d\n",
+                                                    url,
+                                                    round_up((apr_size_t)hinfo.size, round),
+                                                    round_up(
+                                                            disk_info.has_body ? (apr_size_t)dinfo.size
+                                                                    : 0, round),
+                                                    disk_info.status,
+                                                    disk_info.entity_version,
+                                                    disk_info.date,
+                                                    disk_info.expire,
+                                                    disk_info.request_time,
+                                                    disk_info.response_time,
+                                                    disk_info.has_body,
+                                                    disk_info.header_only);
+                                        }
+                                    }
+                                    else {
+                                        apr_finfo_t dinfo;
+
+                                        /* stat the data file */
+                                        if (disk_info.has_body && APR_SUCCESS
+                                                != apr_stat(
+                                                        &dinfo,
+                                                        apr_pstrcat(
+                                                                p,
+                                                                path,
+                                                                "/",
+                                                                apr_pstrndup(
+                                                                        p,
+                                                                        info.name,
+                                                                        ext
+                                                                                - info.name),
+                                                                CACHE_DATA_SUFFIX,
+                                                                NULL),
+                                                        APR_FINFO_SIZE
+                                                                | APR_FINFO_IDENT,
+                                                        p)) {
+                                            /* ignore the file */
+                                        }
+                                        else if (disk_info.has_body && (dinfo.device
+                                                != disk_info.device
+                                                || dinfo.inode
+                                                        != disk_info.inode)) {
+                                            /* ignore the file */
+                                        }
+                                        else {
+                                            apr_file_printf(outfile, "%s\n",
+                                                    url);
+                                        }
+                                    }
+                                }
+
+                                break;
+                            }
+                        }
+                    }
+                    apr_file_close(fd);
+
+                }
+            }
+        }
+
+    }
+
+    apr_dir_close(dir);
+
+    if (interrupted) {
+        return 1;
+    }
+
+    apr_pool_destroy(p);
+
+    if (benice) {
+        apr_sleep(NICE_DELAY);
+    }
+
+    if (interrupted) {
+        return 1;
+    }
+
+    return 0;
+}
+
+/*
+ * walk the cache directory tree
+ */
+static int process_dir(char *path, apr_pool_t *pool, apr_off_t *nodes)
+{
+    apr_dir_t *dir;
+    apr_pool_t *p;
+    apr_hash_t *h;
+    apr_hash_index_t *i;
+    apr_file_t *fd;
+    apr_status_t status;
+    apr_finfo_t info;
+    apr_size_t len;
+    apr_time_t current, deviation;
+    char *nextpath, *base, *ext;
+    APR_RING_ENTRY(_direntry) anchor;
+    DIRENTRY *d, *t, *n;
+    ENTRY *e;
+    int skip, retries;
+    disk_cache_info_t disk_info;
+
+    APR_RING_INIT(&anchor, _direntry, link);
+    apr_pool_create(&p, pool);
+    h = apr_hash_make(p);
+    fd = NULL;
+    deviation = MAXDEVIATION * APR_USEC_PER_SEC;
+
+    if (apr_dir_open(&dir, path, p) != APR_SUCCESS) {
+        return 1;
+    }
+
+    while (apr_dir_read(&info, 0, dir) == APR_SUCCESS && !interrupted) {
+        if (!strcmp(info.name, ".") || !strcmp(info.name, "..")) {
+            continue;
+        }
+        d = apr_pcalloc(p, sizeof(DIRENTRY));
+        d->basename = apr_pstrcat(p, path, "/", info.name, NULL);
+        APR_RING_INSERT_TAIL(&anchor, d, _direntry, link);
+        (*nodes)++;
+    }
+
+    apr_dir_close(dir);
+
+    if (interrupted) {
+        return 1;
+    }
+
+    skip = baselen + 1;
+
+    for (d = APR_RING_FIRST(&anchor);
+         !interrupted && d != APR_RING_SENTINEL(&anchor, _direntry, link);
+         d=n) {
+        n = APR_RING_NEXT(d, link);
+        base = strrchr(d->basename, '/');
+        if (!base++) {
+            base = d->basename;
+        }
+        ext = strchr(base, '.');
+
+        /* there may be temporary files which may be gone before
+         * processing, always skip these if not in realclean mode
+         */
+        if (!ext && !realclean) {
+            if (!strncasecmp(base, AP_TEMPFILE_BASE, AP_TEMPFILE_BASELEN)
+                && strlen(base) == AP_TEMPFILE_NAMELEN) {
+                continue;
+            }
+        }
+
+        /* this may look strange but apr_stat() may return an error which
+         * is system dependent and there may be transient failures,
+         * so just blindly retry for a short while
+         */
+        retries = STAT_ATTEMPTS;
+        status = APR_SUCCESS;
+        do {
+            if (status != APR_SUCCESS) {
+                apr_sleep(STAT_DELAY);
+            }
+            status = apr_stat(&info, d->basename, DIRINFO, p);
+        } while (status != APR_SUCCESS && !interrupted && --retries);
+
+        /* what may happen here is that apache did create a file which
+         * we did detect but then does delete the file before we can
+         * get file information, so if we don't get any file information
+         * we will ignore the file in this case
+         */
+        if (status != APR_SUCCESS) {
+            if (!realclean && !interrupted) {
+                continue;
+            }
+            return 1;
+        }
+
+        if (info.filetype == APR_DIR) {
+            if (process_dir(d->basename, pool, nodes)) {
+                return 1;
+            }
+            continue;
+        }
+
+        if (info.filetype != APR_REG) {
+            continue;
+        }
+
+        if (!ext) {
+            if (!strncasecmp(base, AP_TEMPFILE_BASE, AP_TEMPFILE_BASELEN)
+                && strlen(base) == AP_TEMPFILE_NAMELEN) {
+                d->basename += skip;
+                d->type = TEMP;
+                d->dsize = info.size;
+                apr_hash_set(h, d->basename, APR_HASH_KEY_STRING, d);
+            }
+            continue;
+        }
+
+        if (!strcasecmp(ext, CACHE_HEADER_SUFFIX)) {
+            *ext = '\0';
+            d->basename += skip;
+            /* if a user manually creates a '.header' file */
+            if (d->basename[0] == '\0') {
+                continue;
+            }
+            t = apr_hash_get(h, d->basename, APR_HASH_KEY_STRING);
+            if (t) {
+                d = t;
+            }
+            d->type |= HEADER;
+            d->htime = info.mtime;
+            d->hsize = info.size;
+            apr_hash_set(h, d->basename, APR_HASH_KEY_STRING, d);
+            continue;
+        }
+
+        if (!strcasecmp(ext, CACHE_DATA_SUFFIX)) {
+            *ext = '\0';
+            d->basename += skip;
+            /* if a user manually creates a '.data' file */
+            if (d->basename[0] == '\0') {
+                continue;
+            }
+            t = apr_hash_get(h, d->basename, APR_HASH_KEY_STRING);
+            if (t) {
+                d = t;
+            }
+            d->type |= DATA;
+            d->dtime = info.mtime;
+            d->dsize = info.size;
+            apr_hash_set(h, d->basename, APR_HASH_KEY_STRING, d);
+        }
+    }
+
+    if (interrupted) {
+        return 1;
+    }
+
+    path[baselen] = '\0';
+
+    for (i = apr_hash_first(p, h); i && !interrupted; i = apr_hash_next(i)) {
+        void *hvalue;
+        apr_uint32_t format;
+
+        apr_hash_this(i, NULL, NULL, &hvalue);
+        d = hvalue;
+
+        switch(d->type) {
+        case HEADERDATA:
+            nextpath = apr_pstrcat(p, path, "/", d->basename,
+                                   CACHE_HEADER_SUFFIX, NULL);
+            if (apr_file_open(&fd, nextpath, APR_FOPEN_READ | APR_FOPEN_BINARY,
+                              APR_OS_DEFAULT, p) == APR_SUCCESS) {
+                len = sizeof(format);
+                if (apr_file_read_full(fd, &format, len,
+                                       &len) == APR_SUCCESS) {
+                    if (format == DISK_FORMAT_VERSION) {
+                        apr_off_t offset = 0;
+
+                        apr_file_seek(fd, APR_SET, &offset);
+
+                        len = sizeof(disk_cache_info_t);
+
+                        if (apr_file_read_full(fd, &disk_info, len,
+                                               &len) == APR_SUCCESS) {
+                            apr_file_close(fd);
+                            e = apr_palloc(pool, sizeof(ENTRY));
+                            APR_RING_INSERT_TAIL(&root, e, _entry, link);
+                            e->expire = disk_info.expire;
+                            e->response_time = disk_info.response_time;
+                            e->htime = d->htime;
+                            e->dtime = d->dtime;
+                            e->hsize = d->hsize;
+                            e->dsize = d->dsize;
+                            e->basename = apr_pstrdup(pool, d->basename);
+                            if (!disk_info.has_body) {
+                                delete_file(path, apr_pstrcat(p, path, "/",
+                                        d->basename, CACHE_DATA_SUFFIX, NULL),
+                                        nodes, p);
+                            }
+                            break;
+                        }
+                        else {
+                            apr_file_close(fd);
+                        }
+                    }
+                    else if (format == VARY_FORMAT_VERSION) {
+                        apr_finfo_t finfo;
+
+                        /* This must be a URL that added Vary headers later,
+                         * so kill the orphaned .data file
+                         */
+                        apr_file_close(fd);
+
+                        if (apr_stat(&finfo, apr_pstrcat(p, nextpath,
+                                CACHE_VDIR_SUFFIX, NULL), APR_FINFO_TYPE, p)
+                                || finfo.filetype != APR_DIR) {
+                            delete_entry(path, d->basename, nodes, p);
+                        }
+                        else {
+                            delete_file(path, apr_pstrcat(p, path, "/",
+                                    d->basename, CACHE_DATA_SUFFIX, NULL),
+                                    nodes, p);
+                        }
+                        break;
+                    }
+                    else {
+                        /* We didn't recognise the format, kill the files */
+                        apr_file_close(fd);
+                        delete_entry(path, d->basename, nodes, p);
+                        break;
+                    }
+                }
+                else {
+                    apr_file_close(fd);
+                }
+
+            }
+            /* we have a somehow unreadable headers file which is associated
+             * with a data file. this may be caused by apache currently
+             * rewriting the headers file. thus we may delete the file set
+             * either in realclean mode or if the headers file modification
+             * timestamp is not within a specified positive or negative offset
+             * to the current time.
+             */
+            current = apr_time_now();
+            if (realclean || d->htime < current - deviation
+                || d->htime > current + deviation) {
+                delete_entry(path, d->basename, nodes, p);
+                unsolicited += d->hsize;
+                unsolicited += d->dsize;
+            }
+            break;
+
+        /* single data and header files may be deleted either in realclean
+         * mode or if their modification timestamp is not within a
+         * specified positive or negative offset to the current time.
+         * this handling is necessary due to possible race conditions
+         * between apache and this process
+         */
+        case HEADER:
+            current = apr_time_now();
+            nextpath = apr_pstrcat(p, path, "/", d->basename,
+                                   CACHE_HEADER_SUFFIX, NULL);
+            if (apr_file_open(&fd, nextpath, APR_FOPEN_READ | APR_FOPEN_BINARY,
+                              APR_OS_DEFAULT, p) == APR_SUCCESS) {
+                len = sizeof(format);
+                if (apr_file_read_full(fd, &format, len,
+                                       &len) == APR_SUCCESS) {
+                    if (format == VARY_FORMAT_VERSION) {
+                        apr_time_t expires;
+
+                        len = sizeof(expires);
+
+                        if (apr_file_read_full(fd, &expires, len,
+                                               &len) == APR_SUCCESS) {
+                            apr_finfo_t finfo;
+
+                            apr_file_close(fd);
+
+                            if (apr_stat(&finfo, apr_pstrcat(p, nextpath,
+                                    CACHE_VDIR_SUFFIX, NULL), APR_FINFO_TYPE, p)
+                                    || finfo.filetype != APR_DIR) {
+                                delete_entry(path, d->basename, nodes, p);
+                            }
+                            else if (expires < current) {
+                                delete_entry(path, d->basename, nodes, p);
+                            }
+
+                            break;
+                        }
+                    }
+                    else if (format == DISK_FORMAT_VERSION) {
+                        apr_off_t offset = 0;
+
+                        apr_file_seek(fd, APR_SET, &offset);
+
+                        len = sizeof(disk_cache_info_t);
+
+                        if (apr_file_read_full(fd, &disk_info, len,
+                                               &len) == APR_SUCCESS) {
+                            apr_file_close(fd);
+                            e = apr_palloc(pool, sizeof(ENTRY));
+                            APR_RING_INSERT_TAIL(&root, e, _entry, link);
+                            e->expire = disk_info.expire;
+                            e->response_time = disk_info.response_time;
+                            e->htime = d->htime;
+                            e->dtime = d->dtime;
+                            e->hsize = d->hsize;
+                            e->dsize = d->dsize;
+                            e->basename = apr_pstrdup(pool, d->basename);
+                            break;
+                        }
+                        else {
+                            apr_file_close(fd);
+                        }
+                    }
+                    else {
+                        apr_file_close(fd);
+                        delete_entry(path, d->basename, nodes, p);
+                        break;
+                    }
+                }
+                else {
+                    apr_file_close(fd);
+                }
+            }
+
+            if (realclean || d->htime < current - deviation
+                || d->htime > current + deviation) {
+                delete_entry(path, d->basename, nodes, p);
+                unsolicited += d->hsize;
+            }
+            break;
+
+        case DATA:
+            current = apr_time_now();
+            if (realclean || d->dtime < current - deviation
+                || d->dtime > current + deviation) {
+                delete_entry(path, d->basename, nodes, p);
+                unsolicited += d->dsize;
+            }
+            break;
+
+        /* temp files may only be deleted in realclean mode which
+         * is asserted above if a tempfile is in the hash array
+         */
+        case TEMP:
+            delete_file(path, d->basename, nodes, p);
+            unsolicited += d->dsize;
+            break;
+        }
+    }
+
+    if (interrupted) {
+        return 1;
+    }
+
+    apr_pool_destroy(p);
+
+    if (benice) {
+        apr_sleep(NICE_DELAY);
+    }
+
+    if (interrupted) {
+        return 1;
+    }
+
+    return 0;
+}
+
+/*
+ * purge cache entries
+ */
+static void purge(char *path, apr_pool_t *pool, apr_off_t max,
+        apr_off_t inodes, apr_off_t nodes, apr_off_t round)
+{
+    ENTRY *e, *n, *oldest;
+
+    struct stats s;
+    s.sum = 0;
+    s.entries = 0;
+    s.dfuture = 0;
+    s.dexpired = 0;
+    s.dfresh = 0;
+    s.max = max;
+    s.nodes = nodes;
+    s.inodes = inodes;
+    s.ntotal = nodes;
+
+    for (e = APR_RING_FIRST(&root);
+         e != APR_RING_SENTINEL(&root, _entry, link);
+         e = APR_RING_NEXT(e, link)) {
+        s.sum += round_up((apr_size_t)e->hsize, round);
+        s.sum += round_up((apr_size_t)e->dsize, round);
+        s.entries++;
+    }
+
+    s.total = s.sum;
+    s.etotal = s.entries;
+
+    if ((!s.max || s.sum <= s.max) && (!s.inodes || s.nodes <= s.inodes)) {
+        printstats(path, &s);
+        return;
+    }
+
+    /* process all entries with a timestamp in the future, this may
+     * happen if a wrong system time is corrected
+     */
+
+    for (e = APR_RING_FIRST(&root);
+         e != APR_RING_SENTINEL(&root, _entry, link) && !interrupted;) {
+        n = APR_RING_NEXT(e, link);
+        if (e->response_time > now || e->htime > now || e->dtime > now) {
+            delete_entry(path, e->basename, &s.nodes, pool);
+            s.sum -= round_up((apr_size_t)e->hsize, round);
+            s.sum -= round_up((apr_size_t)e->dsize, round);
+            s.entries--;
+            s.dfuture++;
+            APR_RING_REMOVE(e, link);
+            if ((!s.max || s.sum <= s.max) && (!s.inodes || s.nodes <= s.inodes)) {
+                if (!interrupted) {
+                    printstats(path, &s);
+                }
+                return;
+            }
+        }
+        e = n;
+    }
+
+    if (interrupted) {
+        return;
+    }
+
+    /* process all entries with are expired */
+    for (e = APR_RING_FIRST(&root);
+         e != APR_RING_SENTINEL(&root, _entry, link) && !interrupted;) {
+        n = APR_RING_NEXT(e, link);
+        if (e->expire != APR_DATE_BAD && e->expire < now) {
+            delete_entry(path, e->basename, &s.nodes, pool);
+            s.sum -= round_up((apr_size_t)e->hsize, round);
+            s.sum -= round_up((apr_size_t)e->dsize, round);
+            s.entries--;
+            s.dexpired++;
+            APR_RING_REMOVE(e, link);
+            if ((!s.max || s.sum <= s.max) && (!s.inodes || s.nodes <= s.inodes)) {
+                if (!interrupted) {
+                    printstats(path, &s);
+                }
+                return;
+            }
+        }
+        e = n;
+    }
+
+    if (interrupted) {
+         return;
+    }
+
+    /* process remaining entries oldest to newest, the check for an empty
+     * ring actually isn't necessary except when the compiler does
+     * corrupt 64bit arithmetics which happened to me once, so better safe
+     * than sorry
+     */
+    while (!((!s.max || s.sum <= s.max) && (!s.inodes || s.nodes <= s.inodes))
+            && !interrupted && !APR_RING_EMPTY(&root, _entry, link)) {
+        oldest = APR_RING_FIRST(&root);
+
+        for (e = APR_RING_NEXT(oldest, link);
+             e != APR_RING_SENTINEL(&root, _entry, link);
+             e = APR_RING_NEXT(e, link)) {
+            if (e->dtime < oldest->dtime) {
+                oldest = e;
+            }
+        }
+
+        delete_entry(path, oldest->basename, &s.nodes, pool);
+        s.sum -= round_up((apr_size_t)oldest->hsize, round);
+        s.sum -= round_up((apr_size_t)oldest->dsize, round);
+        s.entries--;
+        s.dfresh++;
+        APR_RING_REMOVE(oldest, link);
+    }
+
+    if (!interrupted) {
+        printstats(path, &s);
+    }
+}
+
+static apr_status_t remove_directory(apr_pool_t *pool, const char *dir)
+{
+    apr_status_t rv;
+    apr_dir_t *dirp;
+    apr_finfo_t dirent;
+
+    rv = apr_dir_open(&dirp, dir, pool);
+    if (APR_STATUS_IS_ENOENT(rv)) {
+        return rv;
+    }
+    if (rv != APR_SUCCESS) {
+        apr_file_printf(errfile, "Could not open directory %s: %pm" APR_EOL_STR,
+                dir, &rv);
+        return rv;
+    }
+
+    while (apr_dir_read(&dirent, APR_FINFO_DIRENT | APR_FINFO_TYPE, dirp)
+            == APR_SUCCESS) {
+        if (dirent.filetype == APR_DIR) {
+            if (strcmp(dirent.name, ".") && strcmp(dirent.name, "..")) {
+                rv = remove_directory(pool, apr_pstrcat(pool, dir, "/",
+                        dirent.name, NULL));
+                /* tolerate the directory not being empty, the cache may have
+                 * attempted to recreate the directory in the mean time.
+                 */
+                if (APR_SUCCESS != rv && APR_ENOTEMPTY != rv) {
+                    break;
+                }
+            }
+        } else {
+            const char *file = apr_pstrcat(pool, dir, "/", dirent.name, NULL);
+            rv = apr_file_remove(file, pool);
+            if (APR_SUCCESS != rv) {
+                apr_file_printf(errfile,
+                        "Could not remove file '%s': %pm" APR_EOL_STR, file,
+                        &rv);
+                break;
+            }
+        }
+    }
+
+    apr_dir_close(dirp);
+
+    if (rv == APR_SUCCESS) {
+        rv = apr_dir_remove(dir, pool);
+        if (APR_ENOTEMPTY == rv) {
+            rv = APR_SUCCESS;
+        }
+        if (rv != APR_SUCCESS) {
+            apr_file_printf(errfile, "Could not remove directory %s: %pm" APR_EOL_STR,
+                    dir, &rv);
+        }
+    }
+
+    return rv;
+}
+
+static apr_status_t find_directory(apr_pool_t *pool, const char *base,
+        const char *rest)
+{
+    apr_status_t rv;
+    apr_dir_t *dirp;
+    apr_finfo_t dirent;
+    int found = 0, files = 0;
+    const char *header = apr_pstrcat(pool, rest, CACHE_HEADER_SUFFIX, NULL);
+    const char *data = apr_pstrcat(pool, rest, CACHE_DATA_SUFFIX, NULL);
+    const char *vdir = apr_pstrcat(pool, rest, CACHE_HEADER_SUFFIX,
+            CACHE_VDIR_SUFFIX, NULL);
+    const char *dirname = NULL;
+
+    rv = apr_dir_open(&dirp, base, pool);
+    if (rv != APR_SUCCESS) {
+        apr_file_printf(errfile, "Could not open directory %s: %pm" APR_EOL_STR,
+                base, &rv);
+        return rv;
+    }
+
+    rv = APR_ENOENT;
+
+    while (apr_dir_read(&dirent, APR_FINFO_DIRENT | APR_FINFO_TYPE, dirp)
+            == APR_SUCCESS) {
+        int len = strlen(dirent.name);
+        int restlen = strlen(rest);
+        if (dirent.filetype == APR_DIR && !strncmp(rest, dirent.name, len)) {
+            dirname = apr_pstrcat(pool, base, "/", dirent.name, NULL);
+            rv = find_directory(pool, dirname, rest + (len < restlen ? len
+                    : restlen));
+            if (APR_SUCCESS == rv) {
+                found = 1;
+            }
+        }
+        if (dirent.filetype == APR_DIR) {
+            if (!strcmp(dirent.name, vdir)) {
+                files = 1;
+            }
+        }
+        if (dirent.filetype == APR_REG) {
+            if (!strcmp(dirent.name, header) || !strcmp(dirent.name, data)) {
+                files = 1;
+            }
+        }
+    }
+
+    apr_dir_close(dirp);
+
+    if (files) {
+        rv = APR_SUCCESS;
+        if (!dryrun) {
+            const char *remove;
+            apr_status_t status;
+
+            remove = apr_pstrcat(pool, base, "/", header, NULL);
+            status = apr_file_remove(remove, pool);
+            if (status != APR_SUCCESS && !APR_STATUS_IS_ENOENT(status)) {
+                apr_file_printf(errfile, "Could not remove file %s: %pm" APR_EOL_STR,
+                        remove, &status);
+                rv = status;
+            }
+
+            remove = apr_pstrcat(pool, base, "/", data, NULL);
+            status = apr_file_remove(remove, pool);
+            if (status != APR_SUCCESS && !APR_STATUS_IS_ENOENT(status)) {
+                apr_file_printf(errfile, "Could not remove file %s: %pm" APR_EOL_STR,
+                        remove, &status);
+                rv = status;
+            }
+
+            status = remove_directory(pool, apr_pstrcat(pool, base, "/", vdir, NULL));
+            if (status != APR_SUCCESS && !APR_STATUS_IS_ENOENT(status)) {
+                rv = status;
+            }
+        }
+    }
+
+    /* If asked to delete dirs, do so now. We don't care if it fails.
+     * If it fails, it likely means there was something else there.
+     */
+    if (dirname && deldirs && !dryrun) {
+        apr_dir_remove(dirname, pool);
+    }
+
+    if (found) {
+        return APR_SUCCESS;
+    }
+
+    return rv;
+}
+
+/**
+ * Delete a specific URL from the cache.
+ */
+static apr_status_t delete_url(apr_pool_t *pool, const char *proxypath, const char *url)
+{
+    apr_md5_ctx_t context;
+    unsigned char digest[16];
+    char tmp[23];
+    int i, k;
+    unsigned int x;
+    static const char enc_table[64] =
+            "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_@";
+
+    apr_md5_init(&context);
+    apr_md5_update(&context, (const unsigned char *) url, strlen(url));
+    apr_md5_final(digest, &context);
+
+    /* encode 128 bits as 22 characters, using a modified uuencoding
+     * the encoding is 3 bytes -> 4 characters* i.e. 128 bits is
+     * 5 x 3 bytes + 1 byte -> 5 * 4 characters + 2 characters
+     */
+    for (i = 0, k = 0; i < 15; i += 3) {
+        x = (digest[i] << 16) | (digest[i + 1] << 8) | digest[i + 2];
+        tmp[k++] = enc_table[x >> 18];
+        tmp[k++] = enc_table[(x >> 12) & 0x3f];
+        tmp[k++] = enc_table[(x >> 6) & 0x3f];
+        tmp[k++] = enc_table[x & 0x3f];
+    }
+
+    /* one byte left */
+    x = digest[15];
+    tmp[k++] = enc_table[x >> 2]; /* use up 6 bits */
+    tmp[k++] = enc_table[(x << 4) & 0x3f];
+    tmp[k] = 0;
+
+    /* automatically find the directory levels */
+    return find_directory(pool, proxypath, tmp);
+}
+
+/*
+ * usage info
+ */
+#define NL APR_EOL_STR
+static void usage(const char *error)
+{
+    if (error) {
+        apr_file_printf(errfile, "%s error: %s\n", shortname, error);
+    }
+    apr_file_printf(errfile,
+    "%s -- program for cleaning the disk cache."                             NL
+    "Usage: %s [-Dvtrn] -pPATH [-lLIMIT|-LLIMIT] [-PPIDFILE]"                NL
+    "       %s [-nti] -dINTERVAL -pPATH [-lLIMIT|-LLIMIT] [-PPIDFILE]"       NL
+    "       %s [-Dvt] -pPATH URL ..."                                        NL
+                                                                             NL
+    "Options:"                                                               NL
+    "  -d   Daemonize and repeat cache cleaning every INTERVAL minutes."     NL
+    "       This option is mutually exclusive with the -D, -v and -r"        NL
+    "       options."                                                        NL
+                                                                             NL
+    "  -D   Do a dry run and don't delete anything. This option is mutually" NL
+    "       exclusive with the -d option. When doing a dry run and deleting" NL
+    "       directories with -t, the inodes reported deleted in the stats"   NL
+    "       cannot take into account the directories deleted, and will be"   NL
+    "       marked as an estimate."                                          NL
+                                                                             NL
+    "  -v   Be verbose and print statistics. This option is mutually"        NL
+    "       exclusive with the -d option."                                   NL
+                                                                             NL
+    "  -r   Clean thoroughly. This assumes that the Apache web server is "   NL
+    "       not running. This option is mutually exclusive with the -d"      NL
+    "       option and implies -t."                                          NL
+                                                                             NL
+    "  -n   Be nice. This causes slower processing in favour of other"       NL
+    "       processes."                                                      NL
+                                                                             NL
+    "  -t   Delete all empty directories. By default only cache files are"   NL
+    "       removed, however with some configurations the large number of"   NL
+    "       directories created may require attention."                      NL
+                                                                             NL
+    "  -p   Specify PATH as the root directory of the disk cache."           NL
+                                                                             NL
+    "  -P   Specify PIDFILE as the file to write the pid to."                NL
+                                                                             NL
+    "  -R   Specify amount to round sizes up to."                            NL
+                                                                             NL
+    "  -l   Specify LIMIT as the total disk cache size limit. Attach 'K'"    NL
+    "       or 'M' to the number for specifying KBytes or MBytes."           NL
+                                                                             NL
+    "  -L   Specify LIMIT as the total disk cache inode limit."              NL
+                                                                             NL
+    "  -i   Be intelligent and run only when there was a modification of"    NL
+    "       the disk cache. This option is only possible together with the"  NL
+    "       -d option."                                                      NL
+                                                                             NL
+    "  -a   List the URLs currently stored in the cache. Variants of the"    NL
+    "       same URL will be listed once for each variant."                  NL
+                                                                             NL
+    "  -A   List the URLs currently stored in the cache, along with their"   NL
+    "       attributes in the following order: url, header size, body size," NL
+    "       status, entity version, date, expiry, request time,"             NL
+    "       response time, body present, head request."                      NL
+                                                                             NL
+    "Should an URL be provided on the command line, the URL will be"         NL
+    "deleted from the cache. A reverse proxied URL is made up as follows:"   NL
+    "http://<hostname>:<port><path>?[query]. So, for the path \"/\" on the"  NL
+    "host \"localhost\" and port 80, the URL to delete becomes"              NL
+    "\"http://localhost:80/?\". Note the '?' in the URL must always be"      NL
+    "specified explicitly, whether a query string is present or not."        NL,
+    shortname,
+    shortname,
+    shortname,
+    shortname
+    );
+
+    exit(1);
+}
+#undef NL
+
+static void usage_repeated_arg(apr_pool_t *pool, char option) {
+    usage(apr_psprintf(pool,
+                       "The option '%c' cannot be specified more than once",
+                       option));
+}
+
+static void log_pid(apr_pool_t *pool, const char *pidfilename, apr_file_t **pidfile)
+{
+    apr_status_t status;
+    pid_t mypid = getpid();
+
+    if (APR_SUCCESS == (status = apr_file_open(pidfile, pidfilename,
+                APR_FOPEN_WRITE | APR_FOPEN_CREATE | APR_FOPEN_TRUNCATE |
+                APR_FOPEN_DELONCLOSE, APR_FPROT_UREAD | APR_FPROT_UWRITE |
+                APR_FPROT_GREAD | APR_FPROT_WREAD, pool))) {
+        apr_file_printf(*pidfile, "%" APR_PID_T_FMT APR_EOL_STR, mypid);
+    }
+    else {
+        if (errfile) {
+            apr_file_printf(errfile,
+                            "Could not write the pid file '%s': %pm" APR_EOL_STR,
+                            pidfilename, &status);
+        }
+        exit(1);
+    }
+}
+
+/*
+ * main
+ */
+int main(int argc, const char * const argv[])
+{
+    apr_off_t max, inodes, round;
+    apr_time_t current, repeat, delay, previous;
+    apr_status_t status;
+    apr_pool_t *pool, *instance;
+    apr_getopt_t *o;
+    apr_finfo_t info;
+    apr_file_t *pidfile;
+    int retries, isdaemon, limit_found, inodes_found, intelligent, dowork;
+    char opt;
+    const char *arg;
+    char *proxypath, *path, *pidfilename;
+
+    interrupted = 0;
+    repeat = 0;
+    isdaemon = 0;
+    dryrun = 0;
+    limit_found = 0;
+    inodes_found = 0;
+    max = 0;
+    inodes = 0;
+    round = 0;
+    verbose = 0;
+    realclean = 0;
+    benice = 0;
+    deldirs = 0;
+    intelligent = 0;
+    previous = 0; /* avoid compiler warning */
+    proxypath = NULL;
+    pidfilename = NULL;
+
+    if (apr_app_initialize(&argc, &argv, NULL) != APR_SUCCESS) {
+        return 1;
+    }
+    atexit(apr_terminate);
+
+    if (argc) {
+        shortname = apr_filepath_name_get(argv[0]);
+    }
+
+    if (apr_pool_create(&pool, NULL) != APR_SUCCESS) {
+        return 1;
+    }
+    apr_pool_abort_set(oom, pool);
+    apr_file_open_stderr(&errfile, pool);
+    apr_file_open_stdout(&outfile, pool);
+    apr_signal(SIGINT, setterm);
+    apr_signal(SIGTERM, setterm);
+
+    apr_getopt_init(&o, pool, argc, argv);
+
+    while (1) {
+        status = apr_getopt(o, "iDnvrtd:l:L:p:P:R:aA", &opt, &arg);
+        if (status == APR_EOF) {
+            break;
+        }
+        else if (status != APR_SUCCESS) {
+            usage(NULL);
+        }
+        else {
+            char *end;
+            apr_status_t rv;
+            switch (opt) {
+            case 'i':
+                if (intelligent) {
+                    usage_repeated_arg(pool, opt);
+                }
+                intelligent = 1;
+                break;
+
+            case 'D':
+                if (dryrun) {
+                    usage_repeated_arg(pool, opt);
+                }
+                dryrun = 1;
+                break;
+
+            case 'n':
+                if (benice) {
+                    usage_repeated_arg(pool, opt);
+                }
+                benice = 1;
+                break;
+
+            case 't':
+                if (deldirs) {
+                    usage_repeated_arg(pool, opt);
+                }
+                deldirs = 1;
+                break;
+
+            case 'v':
+                if (verbose) {
+                    usage_repeated_arg(pool, opt);
+                }
+                verbose = 1;
+                break;
+
+            case 'r':
+                if (realclean) {
+                    usage_repeated_arg(pool, opt);
+                }
+                realclean = 1;
+                deldirs = 1;
+                break;
+
+            case 'd':
+                if (isdaemon) {
+                    usage_repeated_arg(pool, opt);
+                }
+                isdaemon = 1;
+                repeat = apr_atoi64(arg);
+                repeat *= SECS_PER_MIN;
+                repeat *= APR_USEC_PER_SEC;
+                break;
+
+            case 'l':
+                if (limit_found) {
+                    usage_repeated_arg(pool, opt);
+                }
+                limit_found = 1;
+
+                do {
+                    rv = apr_strtoff(&max, arg, &end, 10);
+                    if (rv == APR_SUCCESS) {
+                        if ((*end == 'K' || *end == 'k') && !end[1]) {
+                            max *= KBYTE;
+                        }
+                        else if ((*end == 'M' || *end == 'm') && !end[1]) {
+                            max *= MBYTE;
+                        }
+                        else if ((*end == 'G' || *end == 'g') && !end[1]) {
+                            max *= GBYTE;
+                        }
+                        else if (*end &&        /* neither empty nor [Bb] */
+                                 ((*end != 'B' && *end != 'b') || end[1])) {
+                            rv = APR_EGENERAL;
+                        }
+                    }
+                    if (rv != APR_SUCCESS) {
+                        usage(apr_psprintf(pool, "Invalid limit: %s"
+                                                 APR_EOL_STR APR_EOL_STR, arg));
+                    }
+                } while(0);
+                break;
+
+            case 'L':
+                if (inodes_found) {
+                    usage_repeated_arg(pool, opt);
+                }
+                inodes_found = 1;
+
+                do {
+                    rv = apr_strtoff(&inodes, arg, &end, 10);
+                    if (rv == APR_SUCCESS) {
+                        if ((*end == 'K' || *end == 'k') && !end[1]) {
+                            inodes *= KBYTE;
+                        }
+                        else if ((*end == 'M' || *end == 'm') && !end[1]) {
+                            inodes *= MBYTE;
+                        }
+                        else if ((*end == 'G' || *end == 'g') && !end[1]) {
+                            inodes *= GBYTE;
+                        }
+                        else if (*end &&        /* neither empty nor [Bb] */
+                                 ((*end != 'B' && *end != 'b') || end[1])) {
+                            rv = APR_EGENERAL;
+                        }
+                    }
+                    if (rv != APR_SUCCESS) {
+                        usage(apr_psprintf(pool, "Invalid limit: %s"
+                                                 APR_EOL_STR APR_EOL_STR, arg));
+                    }
+                } while(0);
+                break;
+
+            case 'a':
+                if (listurls) {
+                    usage_repeated_arg(pool, opt);
+                }
+                listurls = 1;
+                break;
+
+            case 'A':
+                if (listurls) {
+                    usage_repeated_arg(pool, opt);
+                }
+                listurls = 1;
+                listextended = 1;
+                break;
+
+            case 'p':
+                if (proxypath) {
+                    usage_repeated_arg(pool, opt);
+                }
+                proxypath = apr_pstrdup(pool, arg);
+                if ((status = apr_filepath_set(proxypath, pool)) != APR_SUCCESS) {
+                    usage(apr_psprintf(pool, "Could not set filepath to '%s': %pm",
+                                       proxypath, &status));
+                }
+                break;
+
+            case 'P':
+                if (pidfilename) {
+                    usage_repeated_arg(pool, opt);
+                }
+                pidfilename = apr_pstrdup(pool, arg);
+                break;
+
+            case 'R':
+                if (round) {
+                    usage_repeated_arg(pool, opt);
+                }
+                rv = apr_strtoff(&round, arg, &end, 10);
+                if (rv == APR_SUCCESS) {
+                    if (*end) {
+                        usage(apr_psprintf(pool, "Invalid round value: %s"
+                                                 APR_EOL_STR APR_EOL_STR, arg));
+                    }
+                    else if (round < 0) {
+                        usage(apr_psprintf(pool, "Round value must be positive: %s"
+                                                 APR_EOL_STR APR_EOL_STR, arg));
+                    }
+                }
+                if (rv != APR_SUCCESS) {
+                    usage(apr_psprintf(pool, "Invalid round value: %s"
+                                             APR_EOL_STR APR_EOL_STR, arg));
+                }
+                break;
+
+            } /* switch */
+        } /* else */
+    } /* while */
+
+    if (argc <= 1) {
+        usage(NULL);
+    }
+
+    if (!proxypath) {
+         usage("Option -p must be specified");
+    }
+
+    if (o->ind < argc) {
+        int deleted = 0;
+        int error = 0;
+        if (isdaemon) {
+            usage("Option -d cannot be used with URL arguments, aborting");
+        }
+        if (intelligent) {
+            usage("Option -i cannot be used with URL arguments, aborting");
+        }
+        if (limit_found) {
+            usage("Option -l cannot be used with URL arguments, aborting");
+        }
+        while (o->ind < argc) {
+            status = delete_url(pool, proxypath, argv[o->ind]);
+            if (APR_SUCCESS == status) {
+                if (verbose) {
+                    apr_file_printf(errfile, "Removed: %s" APR_EOL_STR,
+                            argv[o->ind]);
+                }
+                deleted = 1;
+            }
+            else if (APR_ENOENT == status) {
+                if (verbose) {
+                    apr_file_printf(errfile, "Not cached: %s" APR_EOL_STR,
+                            argv[o->ind]);
+                }
+            }
+            else {
+                if (verbose) {
+                    apr_file_printf(errfile, "Error while removed: %s" APR_EOL_STR,
+                            argv[o->ind]);
+                }
+                error = 1;
+            }
+            o->ind++;
+        }
+        return error ? 1 : deleted ? 0 : 2;
+    }
+
+    if (isdaemon && repeat <= 0) {
+         usage("Option -d must be greater than zero");
+    }
+
+    if (isdaemon && (verbose || realclean || dryrun || listurls)) {
+         usage("Option -d cannot be used with -v, -r, -L or -D");
+    }
+
+    if (!isdaemon && intelligent) {
+         usage("Option -i cannot be used without -d");
+    }
+
+    if (!listurls && max <= 0 && inodes <= 0) {
+         usage("At least one of option -l or -L must be greater than zero");
+    }
+
+    if (apr_filepath_get(&path, 0, pool) != APR_SUCCESS) {
+        usage(apr_psprintf(pool, "Could not get the filepath: %pm", &status));
+    }
+    baselen = strlen(path);
+
+    if (pidfilename) {
+        log_pid(pool, pidfilename, &pidfile); /* before daemonizing, so we
+                                               * can report errors
+                                               */
+    }
+
+    if (listurls) {
+        list_urls(path, pool, round);
+        return (interrupted != 0);
+    }
+
+#ifndef DEBUG
+    if (isdaemon) {
+        apr_file_close(errfile);
+        errfile = NULL;
+        if (pidfilename) {
+            apr_file_close(pidfile); /* delete original pidfile only in parent */
+        }
+        apr_proc_detach(APR_PROC_DETACH_DAEMONIZE);
+        if (pidfilename) {
+            log_pid(pool, pidfilename, &pidfile);
+        }
+    }
+#endif
+
+    do {
+        apr_pool_create(&instance, pool);
+
+        now = apr_time_now();
+        APR_RING_INIT(&root, _entry, link);
+        delcount = 0;
+        unsolicited = 0;
+        dowork = 0;
+
+        switch (intelligent) {
+        case 0:
+            dowork = 1;
+            break;
+
+        case 1:
+            retries = STAT_ATTEMPTS;
+            status = APR_SUCCESS;
+
+            do {
+                if (status != APR_SUCCESS) {
+                    apr_sleep(STAT_DELAY);
+                }
+                status = apr_stat(&info, path, APR_FINFO_MTIME, instance);
+            } while (status != APR_SUCCESS && !interrupted && --retries);
+
+            if (status == APR_SUCCESS) {
+                previous = info.mtime;
+                intelligent = 2;
+            }
+            dowork = 1;
+            break;
+
+        case 2:
+            retries = STAT_ATTEMPTS;
+            status = APR_SUCCESS;
+
+            do {
+                if (status != APR_SUCCESS) {
+                    apr_sleep(STAT_DELAY);
+                }
+                status = apr_stat(&info, path, APR_FINFO_MTIME, instance);
+            } while (status != APR_SUCCESS && !interrupted && --retries);
+
+            if (status == APR_SUCCESS) {
+                if (previous != info.mtime) {
+                    dowork = 1;
+                }
+                previous = info.mtime;
+                break;
+            }
+            intelligent = 1;
+            dowork = 1;
+            break;
+        }
+
+        if (dowork && !interrupted) {
+            apr_off_t nodes = 0;
+            if (!process_dir(path, instance, &nodes) && !interrupted) {
+                purge(path, instance, max, inodes, nodes, round);
+            }
+            else if (!isdaemon && !interrupted) {
+                apr_file_printf(errfile, "An error occurred, cache cleaning "
+                                         "aborted." APR_EOL_STR);
+                return 1;
+            }
+
+            if (intelligent && !interrupted) {
+                retries = STAT_ATTEMPTS;
+                status = APR_SUCCESS;
+                do {
+                    if (status != APR_SUCCESS) {
+                        apr_sleep(STAT_DELAY);
+                    }
+                    status = apr_stat(&info, path, APR_FINFO_MTIME, instance);
+                } while (status != APR_SUCCESS && !interrupted && --retries);
+
+                if (status == APR_SUCCESS) {
+                    previous = info.mtime;
+                    intelligent = 2;
+                }
+                else {
+                    intelligent = 1;
+                }
+            }
+        }
+
+        apr_pool_destroy(instance);
+
+        current = apr_time_now();
+        if (current < now) {
+            delay = repeat;
+        }
+        else if (current - now >= repeat) {
+            delay = repeat;
+        }
+        else {
+            delay = now + repeat - current;
+        }
+
+        /* we can't sleep the whole delay time here apiece as this is racy
+         * with respect to interrupt delivery - think about what happens
+         * if we have tested for an interrupt, then get scheduled
+         * before the apr_sleep() call and while waiting for the cpu
+         * we do get an interrupt
+         */
+        if (isdaemon) {
+            while (delay && !interrupted) {
+                if (delay > APR_USEC_PER_SEC) {
+                    apr_sleep(APR_USEC_PER_SEC);
+                    delay -= APR_USEC_PER_SEC;
+                }
+                else {
+                    apr_sleep(delay);
+                    delay = 0;
+                }
+            }
+        }
+    } while (isdaemon && !interrupted);
+
+    if (!isdaemon && interrupted) {
+        apr_file_printf(errfile, "Cache cleaning aborted due to user "
+                                 "request." APR_EOL_STR);
+        return 1;
+    }
+
+    return 0;
+}