root/tags/1.1.0/xcache.c

#undef DEBUG

/* {{{ macros */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <signal.h>

#include "php.h"
#include "ext/standard/info.h"
#include "ext/standard/md5.h"
#include "ext/standard/php_math.h"
#include "zend_extensions.h"
#include "SAPI.h"

#include "xcache.h"
#include "optimizer.h"
#include "coverager.h"
#include "disassembler.h"
#include "align.h"
#include "stack.h"
#include "xcache_globals.h"
#include "processor.h"
#include "utils.h"
#include "const_string.h"
#include "opcode_spec.h"

#ifdef DEBUG
#   undef NDEBUG
#   undef inline
#   define inline
#else
#   ifndef NDEBUG
#       define NDEBUG
#   endif
#endif
#include <assert.h>

#define VAR_ENTRY_EXPIRED(pentry) ((pentry)->ttl && XG(request_time) > pentry->ctime + (pentry)->ttl)
#define CHECK(x, e) do { if ((x) == NULL) { zend_error(E_ERROR, "XCache: " e); goto err; } } while (0)
#define LOCK(x) xc_lock(x->lck)
#define UNLOCK(x) xc_unlock(x->lck)

#define ENTER_LOCK_EX(x) \
    xc_lock(x->lck); \
    zend_try { \
        do
#define LEAVE_LOCK_EX(x) \
        while (0); \
    } zend_catch { \
        catched = 1; \
    } zend_end_try(); \
    xc_unlock(x->lck)

#define ENTER_LOCK(x) do { \
    int catched = 0; \
    ENTER_LOCK_EX(x)
#define LEAVE_LOCK(x) \
    LEAVE_LOCK_EX(x); \
    if (catched) { \
        zend_bailout(); \
    } \
} while(0)

/* }}} */

/* {{{ globals */
static char *xc_shm_scheme = NULL;
static char *xc_mmap_path = NULL;
static char *xc_coredump_dir = NULL;

static xc_hash_t xc_php_hcache = {0};
static xc_hash_t xc_php_hentry = {0};
static xc_hash_t xc_var_hcache = {0};
static xc_hash_t xc_var_hentry = {0};

static zend_ulong xc_php_ttl    = 0;
static zend_ulong xc_var_maxttl = 0;

enum { xc_deletes_gc_interval = 120 };
static zend_ulong xc_php_gc_interval = 0;
static zend_ulong xc_var_gc_interval = 0;

/* total size */
static zend_ulong xc_php_size  = 0;
static zend_ulong xc_var_size  = 0;

static xc_cache_t **xc_php_caches = NULL;
static xc_cache_t **xc_var_caches = NULL;

static zend_bool xc_initized = 0;
static zend_compile_file_t *origin_compile_file;

static zend_bool xc_test = 0;
static zend_bool xc_readonly_protection = 0;

static zend_bool xc_module_gotup = 0;
static zend_bool xc_zend_extension_gotup = 0;
#if !COMPILE_DL_XCACHE
#   define zend_extension_entry xcache_zend_extension_entry
#endif
ZEND_DLEXPORT zend_extension zend_extension_entry;
ZEND_DECLARE_MODULE_GLOBALS(xcache);
/* }}} */

/* any function in *_dmz is only safe be called within locked(single thread) area */

static inline int xc_entry_equal_dmz(xc_entry_t *a, xc_entry_t *b) /* {{{ */
{
    /* this function isn't required but can be in dmz */

    if (a->type != b->type) {
        return 0;
    }
    switch (a->type) {
        case XC_TYPE_PHP:
#ifdef HAVE_INODE
            do {
                xc_entry_data_php_t *ap = a->data.php;
                xc_entry_data_php_t *bp = b->data.php;
                return ap->inode == bp->inode
                    && ap->device == bp->device;
            } while(0);
#endif
            /* fall */

        case XC_TYPE_VAR:
            do {
#ifdef IS_UNICODE
                if (a->name_type == IS_UNICODE) {
                    if (a->name.ustr.len != b->name.ustr.len) {
                        return 0;
                    }
                    return memcmp(a->name.ustr.val, b->name.ustr.val, (a->name.ustr.len + 1) * sizeof(UChar)) == 0;
                }
                else {
                    return memcmp(a->name.str.val, b->name.str.val, a->name.str.len + 1) == 0;
                }
#else
                return memcmp(a->name.str.val, b->name.str.val, a->name.str.len + 1) == 0;
#endif

            } while(0);
        default:
            assert(0);
    }
    return 0;
}
/* }}} */
static void xc_entry_free_real_dmz(volatile xc_entry_t *xce) /* {{{ */
{
    xce->cache->mem->handlers->free(xce->cache->mem, (xc_entry_t *)xce);
}
/* }}} */
static void xc_entry_add_dmz(xc_entry_t *xce) /* {{{ */
{
    xc_entry_t **head = &(xce->cache->entries[xce->hvalue]);
    xce->next = *head;
    *head = xce;
    xce->cache->entries_count ++;
}
/* }}} */
static xc_entry_t *xc_entry_store_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
    xc_entry_t *stored_xce;

    xce->hits  = 0;
    xce->ctime = XG(request_time);
    xce->atime = XG(request_time);
    stored_xce = xc_processor_store_xc_entry_t(xce TSRMLS_CC);
    if (stored_xce) {
        xc_entry_add_dmz(stored_xce);
        return stored_xce;
    }
    else {
        xce->cache->ooms ++;
        return NULL;
    }
}
/* }}} */
static void xc_entry_free_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
    xce->cache->entries_count --;
    if (xce->refcount == 0) {
        xc_entry_free_real_dmz(xce);
    }
    else {
        xce->next = xce->cache->deletes;
        xce->cache->deletes = xce;
        xce->dtime = XG(request_time);
        xce->cache->deletes_count ++;
    }
    return;
}
/* }}} */
static void xc_entry_remove_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
    xc_entry_t **pp = &(xce->cache->entries[xce->hvalue]);
    xc_entry_t *p;
    for (p = *pp; p; pp = &(p->next), p = p->next) {
        if (xc_entry_equal_dmz(xce, p)) {
            /* unlink */
            *pp = p->next;
            xc_entry_free_dmz(xce TSRMLS_CC);
            return;
        }
    }
    assert(0);
}
/* }}} */
static xc_entry_t *xc_entry_find_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
    xc_entry_t *p;
    for (p = xce->cache->entries[xce->hvalue]; p; p = p->next) {
        if (xc_entry_equal_dmz(xce, p)) {
            if (p->type == XC_TYPE_VAR || /* PHP */ p->data.php->mtime == xce->data.php->mtime) {
                p->hits ++;
                p->atime = XG(request_time);
                return p;
            }
            else {
                xc_entry_remove_dmz(p TSRMLS_CC);
                return NULL;
            }
        }
    }
    return NULL;
}
/* }}} */
static void xc_entry_hold_php_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
#ifdef DEBUG
    fprintf(stderr, "hold %s\n", ZSTR_S(xce->name));
#endif
    xce->refcount ++;
    xc_stack_push(&XG(php_holds)[xce->cache->cacheid], (void *)xce);
}
/* }}} */
#if 0
static void xc_entry_hold_var_dmz(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
    xce->refcount ++;
    xc_stack_push(&XG(var_holds)[xce->cache->cacheid], (void *)xce);
}
/* }}} */
#endif

/* helper function that loop through each entry */
#define XC_ENTRY_APPLY_FUNC(name) int name(xc_entry_t *entry TSRMLS_DC)
typedef XC_ENTRY_APPLY_FUNC((*cache_apply_dmz_func_t));
static void xc_entry_apply_dmz(xc_cache_t *cache, cache_apply_dmz_func_t apply_func TSRMLS_DC) /* {{{ */
{
    xc_entry_t *p, **pp;
    int i, c;

    for (i = 0, c = cache->hentry->size; i < c; i ++) {
        pp = &(cache->entries[i]);
        for (p = *pp; p; p = *pp) {
            if (apply_func(p TSRMLS_CC)) {
                /* unlink */
                *pp = p->next;
                xc_entry_free_dmz(p TSRMLS_CC);
            }
            else {
                pp = &(p->next);
            }
        }
    }
}
/* }}} */

#define XC_CACHE_APPLY_FUNC(name) void name(xc_cache_t *cache TSRMLS_DC)
/* call graph:
 * xc_gc_expires_php -> xc_gc_expires_one -> xc_entry_apply_dmz -> xc_gc_expires_php_entry_dmz
 * xc_gc_expires_var -> xc_gc_expires_one -> xc_entry_apply_dmz -> xc_gc_expires_var_entry_dmz
 */
static XC_ENTRY_APPLY_FUNC(xc_gc_expires_php_entry_dmz) /* {{{ */
{
#ifdef DEBUG
    fprintf(stderr, "ttl %d, %d %d\n", XG(request_time), entry->atime, xc_php_ttl);
#endif
    if (XG(request_time) > entry->atime + xc_php_ttl) {
        return 1;
    }
    return 0;
}
/* }}} */
static XC_ENTRY_APPLY_FUNC(xc_gc_expires_var_entry_dmz) /* {{{ */
{
    if (VAR_ENTRY_EXPIRED(entry)) {
        return 1;
    }
    return 0;
}
/* }}} */
static void xc_gc_expires_one(xc_cache_t *cache, zend_ulong gc_interval, cache_apply_dmz_func_t apply_func TSRMLS_DC) /* {{{ */
{
#ifdef DEBUG
    fprintf(stderr, "interval %d, %d %d\n", XG(request_time), cache->last_gc_expires, gc_interval);
#endif
    if (XG(request_time) - cache->last_gc_expires >= gc_interval) {
        ENTER_LOCK(cache) {
            if (XG(request_time) - cache->last_gc_expires >= gc_interval) {
                cache->last_gc_expires = XG(request_time);
                xc_entry_apply_dmz(cache, apply_func TSRMLS_CC);
            }
        } LEAVE_LOCK(cache);
    }
}
/* }}} */
static void xc_gc_expires_php(TSRMLS_D) /* {{{ */
{
    int i, c;

    if (!xc_php_ttl || !xc_php_gc_interval) {
        return;
    }

    for (i = 0, c = xc_php_hcache.size; i < c; i ++) {
        xc_gc_expires_one(xc_php_caches[i], xc_php_gc_interval, xc_gc_expires_php_entry_dmz TSRMLS_CC);
    }
}
/* }}} */
static void xc_gc_expires_var(TSRMLS_D) /* {{{ */
{
    int i, c;

    if (!xc_var_gc_interval) {
        return;
    }

    for (i = 0, c = xc_var_hcache.size; i < c; i ++) {
        xc_gc_expires_one(xc_var_caches[i], xc_var_gc_interval, xc_gc_expires_var_entry_dmz TSRMLS_CC);
    }
}
/* }}} */

static XC_CACHE_APPLY_FUNC(xc_gc_delete_dmz) /* {{{ */
{
    xc_entry_t *p, **pp;

    pp = &cache->deletes;
    for (p = *pp; p; p = *pp) {
        if (XG(request_time) - p->dtime > 3600) {
            p->refcount = 0;
            /* issue warning here */
        }
        if (p->refcount == 0) {
            /* unlink */
            *pp = p->next;
            cache->deletes_count --;
            xc_entry_free_real_dmz(p);
        }
        else {
            pp = &(p->next);
        }
    }
}
/* }}} */
static XC_CACHE_APPLY_FUNC(xc_gc_deletes_one) /* {{{ */
{
    if (cache->deletes && XG(request_time) - cache->last_gc_deletes > xc_deletes_gc_interval) {
        ENTER_LOCK(cache) {
            if (cache->deletes && XG(request_time) - cache->last_gc_deletes > xc_deletes_gc_interval) {
                cache->last_gc_deletes = XG(request_time);
                xc_gc_delete_dmz(cache TSRMLS_CC);
            }
        } LEAVE_LOCK(cache);
    }
}
/* }}} */
static void xc_gc_deletes(TSRMLS_D) /* {{{ */
{
    int i, c;

    for (i = 0, c = xc_php_hcache.size; i < c; i ++) {
        xc_gc_deletes_one(xc_php_caches[i] TSRMLS_CC);
    }

    for (i = 0, c = xc_var_hcache.size; i < c; i ++) {
        xc_gc_deletes_one(xc_var_caches[i] TSRMLS_CC);
    }
}
/* }}} */

/* helper functions for user functions */
static void xc_fillinfo_dmz(int cachetype, xc_cache_t *cache, zval *return_value TSRMLS_DC) /* {{{ */
{
    zval *blocks;
    const xc_block_t *b;
#ifndef NDEBUG
    xc_memsize_t avail = 0;
#endif
    xc_mem_t *mem = cache->mem;
    const xc_mem_handlers_t *handlers = mem->handlers;
    zend_ulong interval = (cachetype == XC_TYPE_PHP) ? xc_php_gc_interval : xc_var_gc_interval;

    add_assoc_long_ex(return_value, ZEND_STRS("slots"),     cache->hentry->size);
    add_assoc_long_ex(return_value, ZEND_STRS("compiling"), cache->compiling);
    add_assoc_long_ex(return_value, ZEND_STRS("misses"),    cache->misses);
    add_assoc_long_ex(return_value, ZEND_STRS("hits"),      cache->hits);
    add_assoc_long_ex(return_value, ZEND_STRS("clogs"),     cache->clogs);
    add_assoc_long_ex(return_value, ZEND_STRS("ooms"),      cache->ooms);

    add_assoc_long_ex(return_value, ZEND_STRS("cached"),    cache->entries_count);
    add_assoc_long_ex(return_value, ZEND_STRS("deleted"),   cache->deletes_count);
    if (interval) {
        add_assoc_long_ex(return_value, ZEND_STRS("gc"),    (cache->last_gc_expires + interval) - XG(request_time));
    }
    else {
        add_assoc_null_ex(return_value, ZEND_STRS("gc"));
    }

    MAKE_STD_ZVAL(blocks);
    array_init(blocks);

    add_assoc_long_ex(return_value, ZEND_STRS("size"),  handlers->size(mem));
    add_assoc_long_ex(return_value, ZEND_STRS("avail"), handlers->avail(mem));
    add_assoc_bool_ex(return_value, ZEND_STRS("can_readonly"), xc_readonly_protection);

    for (b = handlers->freeblock_first(mem); b; b = handlers->freeblock_next(b)) {
        zval *bi;

        MAKE_STD_ZVAL(bi);
        array_init(bi);

        add_assoc_long_ex(bi, ZEND_STRS("size"),   handlers->block_size(b));
        add_assoc_long_ex(bi, ZEND_STRS("offset"), handlers->block_offset(mem, b));
        add_next_index_zval(blocks, bi);
#ifndef NDEBUG
        avail += handlers->block_size(b);
#endif
    }
    add_assoc_zval_ex(return_value, ZEND_STRS("free_blocks"), blocks);
    assert(avail == handlers->avail(mem));
}
/* }}} */
static void xc_fillentry_dmz(xc_entry_t *entry, int del, zval *list TSRMLS_DC) /* {{{ */
{
    zval* ei;
    xc_entry_data_php_t *php;
    xc_entry_data_var_t *var;

    ALLOC_INIT_ZVAL(ei);
    array_init(ei);

    add_assoc_long_ex(ei, ZEND_STRS("size"),     entry->size);
    add_assoc_long_ex(ei, ZEND_STRS("refcount"), entry->refcount);
    add_assoc_long_ex(ei, ZEND_STRS("hits"),     entry->hits);
    add_assoc_long_ex(ei, ZEND_STRS("ctime"),    entry->ctime);
    add_assoc_long_ex(ei, ZEND_STRS("atime"),    entry->atime);
    if (del) {
        add_assoc_long_ex(ei, ZEND_STRS("dtime"), entry->dtime);
    }
#ifdef IS_UNICODE
    do {
        zval *zv;
        ALLOC_INIT_ZVAL(zv);
        switch (entry->name_type) {
            case IS_UNICODE:
                    ZVAL_UNICODEL(zv, entry->name.ustr.val, entry->name.ustr.len, 1);
                break;
            case IS_STRING:
                ZVAL_STRINGL(zv, entry->name.str.val, entry->name.str.len, 1);
                break;
            default:
                assert(0);
        }
        zv->type = entry->name_type;
        add_assoc_zval_ex(ei, ZEND_STRS("name"), zv);
    } while (0);
#else
    add_assoc_stringl_ex(ei, ZEND_STRS("name"), entry->name.str.val, entry->name.str.len, 1);
#endif
    switch (entry->type) {
        case XC_TYPE_PHP:
            php = entry->data.php;
            add_assoc_long_ex(ei, ZEND_STRS("sourcesize"),    php->sourcesize);
#ifdef HAVE_INODE
            add_assoc_long_ex(ei, ZEND_STRS("device"),        php->device);
            add_assoc_long_ex(ei, ZEND_STRS("inode"),         php->inode);
#endif
            add_assoc_long_ex(ei, ZEND_STRS("mtime"),         php->mtime);

#ifdef HAVE_XCACHE_CONSTANT
            add_assoc_long_ex(ei, ZEND_STRS("constinfo_cnt"), php->constinfo_cnt);
#endif
            add_assoc_long_ex(ei, ZEND_STRS("function_cnt"),  php->funcinfo_cnt);
            add_assoc_long_ex(ei, ZEND_STRS("class_cnt"),     php->classinfo_cnt);
            break;
        case XC_TYPE_VAR:
            var = entry->data.var;
            break;

        default:
            assert(0);
    }

    add_next_index_zval(list, ei);
}
/* }}} */
static void xc_filllist_dmz(xc_cache_t *cache, zval *return_value TSRMLS_DC) /* {{{ */
{
    zval* list;
    int i, c;
    xc_entry_t *e;

    ALLOC_INIT_ZVAL(list);
    array_init(list);

    for (i = 0, c = cache->hentry->size; i < c; i ++) {
        for (e = cache->entries[i]; e; e = e->next) {
            xc_fillentry_dmz(e, 0, list TSRMLS_CC);
        }
    }
    add_assoc_zval(return_value, "cache_list", list);

    ALLOC_INIT_ZVAL(list);
    array_init(list);
    for (e = cache->deletes; e; e = e->next) {
        xc_fillentry_dmz(e, 1, list TSRMLS_CC);
    }
    add_assoc_zval(return_value, "deleted_list", list);
}
/* }}} */

static zend_op_array *xc_entry_install(xc_entry_t *xce, zend_file_handle *h TSRMLS_DC) /* {{{ */
{
    zend_uint i;
    xc_entry_data_php_t *p = xce->data.php;
#ifndef ZEND_ENGINE_2
    /* new ptr which is stored inside CG(class_table) */
    xc_cest_t **new_cest_ptrs = (xc_cest_t **)do_alloca(sizeof(xc_cest_t*) * p->classinfo_cnt);
#endif

#ifdef HAVE_XCACHE_CONSTANT
    /* install constant */
    for (i = 0; i < p->constinfo_cnt; i ++) {
        xc_constinfo_t *ci = &p->constinfos[i];
        xc_install_constant(xce->name.str.val, &ci->constant,
                UNISW(0, ci->type), ci->key, ci->key_size TSRMLS_CC);
    }
#endif

    /* install function */
    for (i = 0; i < p->funcinfo_cnt; i ++) {
        xc_funcinfo_t  *fi = &p->funcinfos[i];
        xc_install_function(xce->name.str.val, &fi->func,
                UNISW(0, fi->type), fi->key, fi->key_size TSRMLS_CC);
    }

    /* install class */
    for (i = 0; i < p->classinfo_cnt; i ++) {
        xc_classinfo_t *ci = &p->classinfos[i];
#ifndef ZEND_ENGINE_2
        zend_class_entry *ce = CestToCePtr(ci->cest);
        /* fix pointer to the be which inside class_table */
        if (ce->parent) {
            zend_uint class_idx = (/* class_num */ (int) ce->parent) - 1;
            assert(class_idx < i);
            ci->cest.parent = new_cest_ptrs[class_idx];
        }
        new_cest_ptrs[i] =
#endif
        xc_install_class(xce->name.str.val, &ci->cest,
                UNISW(0, ci->type), ci->key, ci->key_size TSRMLS_CC);
    }

    i = 1;
    zend_hash_add(&EG(included_files), xce->name.str.val, xce->name.str.len+1, (void *)&i, sizeof(int), NULL);
    if (h) {
        zend_llist_add_element(&CG(open_files), h);
    }

#ifndef ZEND_ENGINE_2
    free_alloca(new_cest_ptrs);
#endif
    return p->op_array;
}
/* }}} */

static inline void xc_entry_unholds_real(xc_stack_t *holds, xc_cache_t **caches, int cachecount TSRMLS_DC) /* {{{ */
{
    int i;
    xc_stack_t *s;
    xc_cache_t *cache;
    xc_entry_t *xce;

    for (i = 0; i < cachecount; i ++) {
        s = &holds[i];
#ifdef DEBUG
        fprintf(stderr, "holded %d\n", xc_stack_size(s));
#endif
        if (xc_stack_size(s)) {
            cache = ((xc_entry_t *)xc_stack_top(s))->cache;
            ENTER_LOCK(cache) {
                while (xc_stack_size(s)) {
                    xce = (xc_entry_t*) xc_stack_pop(s);
#ifdef DEBUG
                    fprintf(stderr, "unhold %s\n", ZSTR_S(xce->name));
#endif
                    xce->refcount --;
                    assert(xce->refcount >= 0);
                }
            } LEAVE_LOCK(cache);
        }
    }
}
/* }}} */
static void xc_entry_unholds(TSRMLS_D) /* {{{ */
{
    xc_entry_unholds_real(XG(php_holds), xc_php_caches, xc_php_hcache.size TSRMLS_CC);
    xc_entry_unholds_real(XG(var_holds), xc_var_caches, xc_var_hcache.size TSRMLS_CC);
}
/* }}} */
static int xc_stat(const char *filename, const char *include_path, struct stat *pbuf TSRMLS_DC) /* {{{ */
{
    char filepath[1024];
    char *paths, *path;
    char *tokbuf;
    int size = strlen(include_path) + 1;
    char tokens[] = { DEFAULT_DIR_SEPARATOR, '\0' };

    paths = (char *)do_alloca(size);
    memcpy(paths, include_path, size);

    for (path = php_strtok_r(paths, tokens, &tokbuf); path; path = php_strtok_r(NULL, tokens, &tokbuf)) {
        if (strlen(path) + strlen(filename) + 1 > 1024) {
            continue;
        }
        snprintf(filepath, sizeof(filepath), "%s/%s", path, filename);
        if (VCWD_STAT(filepath, pbuf) == 0) {
            free_alloca(paths);
            return 0;
        }
    }

    free_alloca(paths);

    return 1;
}
/* }}} */

#define HASH(i) (i)
#define HASH_USTR_L(t, s, l) HASH(zend_u_inline_hash_func(t, s, (l + 1) * sizeof(UChar)))
#define HASH_STR_L(s, l) HASH(zend_inline_hash_func(s, l + 1))
#define HASH_STR(s) HASH_STR_L(s, strlen(s) + 1)
#define HASH_NUM(n) HASH(n)
static inline xc_hash_value_t xc_entry_hash_var(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
    return UNISW(NOTHING, UG(unicode) ? HASH_USTR_L(xce->name_type, xce->name.uni.val, xce->name.uni.len) :)
        HASH_STR_L(xce->name.str.val, xce->name.str.len);
}
/* }}} */
static inline xc_hash_value_t xc_entry_hash_php(xc_entry_t *xce TSRMLS_DC) /* {{{ */
{
#ifdef HAVE_INODE
    return HASH(xce->data.php->device + xce->data.php->inode);
#else
    return xc_entry_hash_var(xce TSRMLS_CC);
#endif
}
/* }}} */
static int xc_entry_init_key_php(xc_entry_t *xce, char *filename TSRMLS_DC) /* {{{ */
{
    struct stat buf, *pbuf;
    xc_hash_value_t hv;
    int cacheid;
    xc_entry_data_php_t *php;
    char *ptr;

    if (!filename || !SG(request_info).path_translated) {
        return 0;
    }

    do {
        if (strcmp(SG(request_info).path_translated, filename) == 0) {
            /* sapi has already done this stat() for us */
            pbuf = sapi_get_stat(TSRMLS_C);
            if (pbuf) {
                break;
            }
        }

        /* absolute path */
        pbuf = &buf;
        if (IS_ABSOLUTE_PATH(filename, strlen(filename))) {
            if (VCWD_STAT(filename, pbuf) != 0) {
                return 0;
            }
            break;
        }

        /* relative path */
        if (*filename == '.' && (IS_SLASH(filename[1]) || filename[1] == '.')) {
            ptr = filename + 1;
            if (*ptr == '.') {
                while (*(++ptr) == '.');
                if (!IS_SLASH(*ptr)) {
                    goto not_relative_path;
                }   
            }

            if (VCWD_STAT(filename, pbuf) != 0) {
                return 0;
            }
            break;
        }
not_relative_path:

        /* use include_path */
        if (xc_stat(filename, PG(include_path), pbuf TSRMLS_CC) != 0) {   
            return 0;
        }
    } while (0);

    if (XG(request_time) - pbuf->st_mtime < 2) {
        return 0;
    }

    UNISW(NOTHING, xce->name_type = IS_STRING;)
    xce->name.str.val = filename;
    xce->name.str.len = strlen(filename);

    php = xce->data.php;
    php->mtime        = pbuf->st_mtime;
#ifdef HAVE_INODE
    php->device       = pbuf