/* 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;
}