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fccache.c
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/*
* Copyright © 2000 Keith Packard
* Copyright © 2005 Patrick Lam
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the author(s) not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. The authors make no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "fcint.h"
#include "fcarch.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#if defined(HAVE_MMAP) || defined(__CYGWIN__)
# include <unistd.h>
# include <sys/mman.h>
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
struct MD5Context {
FcChar32 buf[4];
FcChar32 bits[2];
unsigned char in[64];
};
static void MD5Init(struct MD5Context *ctx);
static void MD5Update(struct MD5Context *ctx, const unsigned char *buf, unsigned len);
static void MD5Final(unsigned char digest[16], struct MD5Context *ctx);
static void MD5Transform(FcChar32 buf[4], FcChar32 in[16]);
#define CACHEBASE_LEN (1 + 32 + 1 + sizeof (FC_ARCHITECTURE) + sizeof (FC_CACHE_SUFFIX))
static FcBool
FcCacheIsMmapSafe (int fd)
{
enum {
MMAP_NOT_INITIALIZED = 0,
MMAP_USE,
MMAP_DONT_USE,
MMAP_CHECK_FS,
} status;
static void *static_status;
status = (intptr_t) fc_atomic_ptr_get (&static_status);
if (status == MMAP_NOT_INITIALIZED)
{
const char *env = getenv ("FONTCONFIG_USE_MMAP");
FcBool use;
if (env && FcNameBool ((const FcChar8 *) env, &use))
status = use ? MMAP_USE : MMAP_DONT_USE;
else
status = MMAP_CHECK_FS;
(void) fc_atomic_ptr_cmpexch (&static_status, NULL, (void *) status);
}
if (status == MMAP_CHECK_FS)
return FcIsFsMmapSafe (fd);
else
return status == MMAP_USE;
}
static const char bin2hex[] = { '0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f' };
static FcChar8 *
FcDirCacheBasename (const FcChar8 * dir, FcChar8 cache_base[CACHEBASE_LEN])
{
unsigned char hash[16];
FcChar8 *hex_hash;
int cnt;
struct MD5Context ctx;
MD5Init (&ctx);
MD5Update (&ctx, (const unsigned char *)dir, strlen ((const char *) dir));
MD5Final (hash, &ctx);
cache_base[0] = '/';
hex_hash = cache_base + 1;
for (cnt = 0; cnt < 16; ++cnt)
{
hex_hash[2*cnt ] = bin2hex[hash[cnt] >> 4];
hex_hash[2*cnt+1] = bin2hex[hash[cnt] & 0xf];
}
hex_hash[2*cnt] = 0;
strcat ((char *) cache_base, "-" FC_ARCHITECTURE FC_CACHE_SUFFIX);
return cache_base;
}
FcBool
FcDirCacheUnlink (const FcChar8 *dir, FcConfig *config)
{
FcChar8 *cache_hashed = NULL;
FcChar8 cache_base[CACHEBASE_LEN];
FcStrList *list;
FcChar8 *cache_dir;
const FcChar8 *sysroot = FcConfigGetSysRoot (config);
FcDirCacheBasename (dir, cache_base);
list = FcStrListCreate (config->cacheDirs);
if (!list)
return FcFalse;
while ((cache_dir = FcStrListNext (list)))
{
if (sysroot)
cache_hashed = FcStrBuildFilename (sysroot, cache_dir, cache_base, NULL);
else
cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL);
if (!cache_hashed)
break;
(void) unlink ((char *) cache_hashed);
FcStrFree (cache_hashed);
}
FcStrListDone (list);
/* return FcFalse if something went wrong */
if (cache_dir)
return FcFalse;
return FcTrue;
}
static int
FcDirCacheOpenFile (const FcChar8 *cache_file, struct stat *file_stat)
{
int fd;
#ifdef _WIN32
if (FcStat (cache_file, file_stat) < 0)
return -1;
#endif
fd = FcOpen((char *) cache_file, O_RDONLY | O_BINARY);
if (fd < 0)
return fd;
#ifndef _WIN32
if (fstat (fd, file_stat) < 0)
{
close (fd);
return -1;
}
#endif
return fd;
}
/*
* Look for a cache file for the specified dir. Attempt
* to use each one we find, stopping when the callback
* indicates success
*/
static FcBool
FcDirCacheProcess (FcConfig *config, const FcChar8 *dir,
FcBool (*callback) (int fd, struct stat *fd_stat,
struct stat *dir_stat, void *closure),
void *closure, FcChar8 **cache_file_ret)
{
int fd = -1;
FcChar8 cache_base[CACHEBASE_LEN];
FcStrList *list;
FcChar8 *cache_dir;
struct stat file_stat, dir_stat;
FcBool ret = FcFalse;
if (FcStatChecksum (dir, &dir_stat) < 0)
return FcFalse;
FcDirCacheBasename (dir, cache_base);
list = FcStrListCreate (config->cacheDirs);
if (!list)
return FcFalse;
while ((cache_dir = FcStrListNext (list)))
{
const FcChar8 *sysroot = FcConfigGetSysRoot (config);
FcChar8 *cache_hashed;
if (sysroot)
cache_hashed = FcStrBuildFilename (sysroot, cache_dir, cache_base, NULL);
else
cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL);
if (!cache_hashed)
break;
fd = FcDirCacheOpenFile (cache_hashed, &file_stat);
if (fd >= 0) {
ret = (*callback) (fd, &file_stat, &dir_stat, closure);
close (fd);
if (ret)
{
if (cache_file_ret)
*cache_file_ret = cache_hashed;
else
FcStrFree (cache_hashed);
break;
}
}
FcStrFree (cache_hashed);
}
FcStrListDone (list);
return ret;
}
#define FC_CACHE_MIN_MMAP 1024
/*
* Skip list element, make sure the 'next' pointer is the last thing
* in the structure, it will be allocated large enough to hold all
* of the necessary pointers
*/
typedef struct _FcCacheSkip FcCacheSkip;
struct _FcCacheSkip {
FcCache *cache;
FcRef ref;
intptr_t size;
dev_t cache_dev;
ino_t cache_ino;
time_t cache_mtime;
FcCacheSkip *next[1];
};
/*
* The head of the skip list; pointers for every possible level
* in the skip list, plus the largest level in the list
*/
#define FC_CACHE_MAX_LEVEL 16
/* Protected by cache_lock below */
static FcCacheSkip *fcCacheChains[FC_CACHE_MAX_LEVEL];
static int fcCacheMaxLevel;
static FcMutex *cache_lock;
static void
lock_cache (void)
{
FcMutex *lock;
retry:
lock = fc_atomic_ptr_get (&cache_lock);
if (!lock) {
lock = (FcMutex *) malloc (sizeof (FcMutex));
FcMutexInit (lock);
if (!fc_atomic_ptr_cmpexch (&cache_lock, NULL, lock)) {
FcMutexFinish (lock);
goto retry;
}
FcMutexLock (lock);
/* Initialize random state */
FcRandom ();
return;
}
FcMutexLock (lock);
}
static void
unlock_cache (void)
{
FcMutexUnlock (cache_lock);
}
static void
free_lock (void)
{
FcMutex *lock;
lock = fc_atomic_ptr_get (&cache_lock);
if (lock && fc_atomic_ptr_cmpexch (&cache_lock, lock, NULL)) {
FcMutexFinish (lock);
free (lock);
}
}
/*
* Generate a random level number, distributed
* so that each level is 1/4 as likely as the one before
*
* Note that level numbers run 1 <= level <= MAX_LEVEL
*/
static int
random_level (void)
{
/* tricky bit -- each bit is '1' 75% of the time */
long int bits = FcRandom () | FcRandom ();
int level = 0;
while (++level < FC_CACHE_MAX_LEVEL)
{
if (bits & 1)
break;
bits >>= 1;
}
return level;
}
/*
* Insert cache into the list
*/
static FcBool
FcCacheInsert (FcCache *cache, struct stat *cache_stat)
{
FcCacheSkip **update[FC_CACHE_MAX_LEVEL];
FcCacheSkip *s, **next;
int i, level;
lock_cache ();
/*
* Find links along each chain
*/
next = fcCacheChains;
for (i = fcCacheMaxLevel; --i >= 0; )
{
for (; (s = next[i]); next = s->next)
if (s->cache > cache)
break;
update[i] = &next[i];
}
/*
* Create new list element
*/
level = random_level ();
if (level > fcCacheMaxLevel)
{
level = fcCacheMaxLevel + 1;
update[fcCacheMaxLevel] = &fcCacheChains[fcCacheMaxLevel];
fcCacheMaxLevel = level;
}
s = malloc (sizeof (FcCacheSkip) + (level - 1) * sizeof (FcCacheSkip *));
if (!s)
return FcFalse;
s->cache = cache;
s->size = cache->size;
FcRefInit (&s->ref, 1);
if (cache_stat)
{
s->cache_dev = cache_stat->st_dev;
s->cache_ino = cache_stat->st_ino;
s->cache_mtime = cache_stat->st_mtime;
}
else
{
s->cache_dev = 0;
s->cache_ino = 0;
s->cache_mtime = 0;
}
/*
* Insert into all fcCacheChains
*/
for (i = 0; i < level; i++)
{
s->next[i] = *update[i];
*update[i] = s;
}
unlock_cache ();
return FcTrue;
}
static FcCacheSkip *
FcCacheFindByAddrUnlocked (void *object)
{
int i;
FcCacheSkip **next = fcCacheChains;
FcCacheSkip *s;
if (!object)
return NULL;
/*
* Walk chain pointers one level at a time
*/
for (i = fcCacheMaxLevel; --i >= 0;)
while (next[i] && (char *) object >= ((char *) next[i]->cache + next[i]->size))
next = next[i]->next;
/*
* Here we are
*/
s = next[0];
if (s && (char *) object < ((char *) s->cache + s->size))
return s;
return NULL;
}
static FcCacheSkip *
FcCacheFindByAddr (void *object)
{
FcCacheSkip *ret;
lock_cache ();
ret = FcCacheFindByAddrUnlocked (object);
unlock_cache ();
return ret;
}
static void
FcCacheRemoveUnlocked (FcCache *cache)
{
FcCacheSkip **update[FC_CACHE_MAX_LEVEL];
FcCacheSkip *s, **next;
int i;
/*
* Find links along each chain
*/
next = fcCacheChains;
for (i = fcCacheMaxLevel; --i >= 0; )
{
for (; (s = next[i]); next = s->next)
if (s->cache >= cache)
break;
update[i] = &next[i];
}
s = next[0];
for (i = 0; i < fcCacheMaxLevel && *update[i] == s; i++)
*update[i] = s->next[i];
while (fcCacheMaxLevel > 0 && fcCacheChains[fcCacheMaxLevel - 1] == NULL)
fcCacheMaxLevel--;
free (s);
}
static FcCache *
FcCacheFindByStat (struct stat *cache_stat)
{
FcCacheSkip *s;
lock_cache ();
for (s = fcCacheChains[0]; s; s = s->next[0])
if (s->cache_dev == cache_stat->st_dev &&
s->cache_ino == cache_stat->st_ino &&
s->cache_mtime == cache_stat->st_mtime)
{
FcRefInc (&s->ref);
unlock_cache ();
return s->cache;
}
unlock_cache ();
return NULL;
}
static void
FcDirCacheDisposeUnlocked (FcCache *cache)
{
FcCacheRemoveUnlocked (cache);
switch (cache->magic) {
case FC_CACHE_MAGIC_ALLOC:
free (cache);
break;
case FC_CACHE_MAGIC_MMAP:
#if defined(HAVE_MMAP) || defined(__CYGWIN__)
munmap (cache, cache->size);
#elif defined(_WIN32)
UnmapViewOfFile (cache);
#endif
break;
}
}
void
FcCacheObjectReference (void *object)
{
FcCacheSkip *skip = FcCacheFindByAddr (object);
if (skip)
FcRefInc (&skip->ref);
}
void
FcCacheObjectDereference (void *object)
{
FcCacheSkip *skip;
lock_cache ();
skip = FcCacheFindByAddrUnlocked (object);
if (skip)
{
if (FcRefDec (&skip->ref) == 1)
FcDirCacheDisposeUnlocked (skip->cache);
}
unlock_cache ();
}
void
FcCacheFini (void)
{
int i;
for (i = 0; i < FC_CACHE_MAX_LEVEL; i++)
assert (fcCacheChains[i] == NULL);
assert (fcCacheMaxLevel == 0);
free_lock ();
}
static FcBool
FcCacheTimeValid (FcCache *cache, struct stat *dir_stat)
{
struct stat dir_static;
if (!dir_stat)
{
if (FcStatChecksum (FcCacheDir (cache), &dir_static) < 0)
return FcFalse;
dir_stat = &dir_static;
}
if (FcDebug () & FC_DBG_CACHE)
printf ("FcCacheTimeValid dir \"%s\" cache checksum %d dir checksum %d\n",
FcCacheDir (cache), cache->checksum, (int) dir_stat->st_mtime);
return cache->checksum == (int) dir_stat->st_mtime;
}
/*
* Map a cache file into memory
*/
static FcCache *
FcDirCacheMapFd (int fd, struct stat *fd_stat, struct stat *dir_stat)
{
FcCache *cache;
FcBool allocated = FcFalse;
if (fd_stat->st_size < (int) sizeof (FcCache))
return NULL;
cache = FcCacheFindByStat (fd_stat);
if (cache)
{
if (FcCacheTimeValid (cache, dir_stat))
return cache;
FcDirCacheUnload (cache);
cache = NULL;
}
/*
* Large cache files are mmap'ed, smaller cache files are read. This
* balances the system cost of mmap against per-process memory usage.
*/
if (FcCacheIsMmapSafe (fd) && fd_stat->st_size >= FC_CACHE_MIN_MMAP)
{
#if defined(HAVE_MMAP) || defined(__CYGWIN__)
cache = mmap (0, fd_stat->st_size, PROT_READ, MAP_SHARED, fd, 0);
#if (HAVE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
posix_fadvise (fd, 0, fd_stat->st_size, POSIX_FADV_WILLNEED);
#endif
if (cache == MAP_FAILED)
cache = NULL;
#elif defined(_WIN32)
{
HANDLE hFileMap;
cache = NULL;
hFileMap = CreateFileMapping((HANDLE) _get_osfhandle(fd), NULL,
PAGE_READONLY, 0, 0, NULL);
if (hFileMap != NULL)
{
cache = MapViewOfFile (hFileMap, FILE_MAP_READ, 0, 0,
fd_stat->st_size);
CloseHandle (hFileMap);
}
}
#endif
}
if (!cache)
{
cache = malloc (fd_stat->st_size);
if (!cache)
return NULL;
if (read (fd, cache, fd_stat->st_size) != fd_stat->st_size)
{
free (cache);
return NULL;
}
allocated = FcTrue;
}
if (cache->magic != FC_CACHE_MAGIC_MMAP ||
cache->version < FC_CACHE_CONTENT_VERSION ||
cache->size != (intptr_t) fd_stat->st_size ||
!FcCacheTimeValid (cache, dir_stat) ||
!FcCacheInsert (cache, fd_stat))
{
if (allocated)
free (cache);
else
{
#if defined(HAVE_MMAP) || defined(__CYGWIN__)
munmap (cache, fd_stat->st_size);
#elif defined(_WIN32)
UnmapViewOfFile (cache);
#endif
}
return NULL;
}
/* Mark allocated caches so they're freed rather than unmapped */
if (allocated)
cache->magic = FC_CACHE_MAGIC_ALLOC;
return cache;
}
void
FcDirCacheReference (FcCache *cache, int nref)
{
FcCacheSkip *skip = FcCacheFindByAddr (cache);
if (skip)
FcRefAdd (&skip->ref, nref);
}
void
FcDirCacheUnload (FcCache *cache)
{
FcCacheObjectDereference (cache);
}
static FcBool
FcDirCacheMapHelper (int fd, struct stat *fd_stat, struct stat *dir_stat, void *closure)
{
FcCache *cache = FcDirCacheMapFd (fd, fd_stat, dir_stat);
if (!cache)
return FcFalse;
*((FcCache **) closure) = cache;
return FcTrue;
}
FcCache *
FcDirCacheLoad (const FcChar8 *dir, FcConfig *config, FcChar8 **cache_file)
{
FcCache *cache = NULL;
if (!FcDirCacheProcess (config, dir,
FcDirCacheMapHelper,
&cache, cache_file))
return NULL;
return cache;
}
FcCache *
FcDirCacheLoadFile (const FcChar8 *cache_file, struct stat *file_stat)
{
int fd;
FcCache *cache;
struct stat my_file_stat;
if (!file_stat)
file_stat = &my_file_stat;
fd = FcDirCacheOpenFile (cache_file, file_stat);
if (fd < 0)
return NULL;
cache = FcDirCacheMapFd (fd, file_stat, NULL);
close (fd);
return cache;
}
/*
* Validate a cache file by reading the header and checking
* the magic number and the size field
*/
static FcBool
FcDirCacheValidateHelper (int fd, struct stat *fd_stat, struct stat *dir_stat, void *closure FC_UNUSED)
{
FcBool ret = FcTrue;
FcCache c;
if (read (fd, &c, sizeof (FcCache)) != sizeof (FcCache))
ret = FcFalse;
else if (c.magic != FC_CACHE_MAGIC_MMAP)
ret = FcFalse;
else if (c.version < FC_CACHE_CONTENT_VERSION)
ret = FcFalse;
else if (fd_stat->st_size != c.size)
ret = FcFalse;
else if (c.checksum != (int) dir_stat->st_mtime)
ret = FcFalse;
return ret;
}
static FcBool
FcDirCacheValidConfig (const FcChar8 *dir, FcConfig *config)
{
return FcDirCacheProcess (config, dir,
FcDirCacheValidateHelper,
NULL, NULL);
}
FcBool
FcDirCacheValid (const FcChar8 *dir)
{
FcConfig *config;
config = FcConfigGetCurrent ();
if (!config)
return FcFalse;
return FcDirCacheValidConfig (dir, config);
}
/*
* Build a cache structure from the given contents
*/
FcCache *
FcDirCacheBuild (FcFontSet *set, const FcChar8 *dir, struct stat *dir_stat, FcStrSet *dirs)
{
FcSerialize *serialize = FcSerializeCreate ();
FcCache *cache;
int i;
FcChar8 *dir_serialize;
intptr_t *dirs_serialize;
FcFontSet *set_serialize;
if (!serialize)
return NULL;
/*
* Space for cache structure
*/
FcSerializeReserve (serialize, sizeof (FcCache));
/*
* Directory name
*/
if (!FcStrSerializeAlloc (serialize, dir))
goto bail1;
/*
* Subdirs
*/
FcSerializeAlloc (serialize, dirs, dirs->num * sizeof (FcChar8 *));
for (i = 0; i < dirs->num; i++)
if (!FcStrSerializeAlloc (serialize, dirs->strs[i]))
goto bail1;
/*
* Patterns
*/
if (!FcFontSetSerializeAlloc (serialize, set))
goto bail1;
/* Serialize layout complete. Now allocate space and fill it */
cache = malloc (serialize->size);
if (!cache)
goto bail1;
/* shut up valgrind */
memset (cache, 0, serialize->size);
serialize->linear = cache;
cache->magic = FC_CACHE_MAGIC_ALLOC;
cache->version = FC_CACHE_CONTENT_VERSION;
cache->size = serialize->size;
cache->checksum = (int) dir_stat->st_mtime;
/*
* Serialize directory name
*/
dir_serialize = FcStrSerialize (serialize, dir);
if (!dir_serialize)
goto bail2;
cache->dir = FcPtrToOffset (cache, dir_serialize);
/*
* Serialize sub dirs
*/
dirs_serialize = FcSerializePtr (serialize, dirs);
if (!dirs_serialize)
goto bail2;
cache->dirs = FcPtrToOffset (cache, dirs_serialize);
cache->dirs_count = dirs->num;
for (i = 0; i < dirs->num; i++)
{
FcChar8 *d_serialize = FcStrSerialize (serialize, dirs->strs[i]);
if (!d_serialize)
goto bail2;
dirs_serialize[i] = FcPtrToOffset (dirs_serialize, d_serialize);
}
/*
* Serialize font set
*/
set_serialize = FcFontSetSerialize (serialize, set);
if (!set_serialize)
goto bail2;
cache->set = FcPtrToOffset (cache, set_serialize);
FcSerializeDestroy (serialize);
FcCacheInsert (cache, NULL);
return cache;
bail2:
free (cache);
bail1:
FcSerializeDestroy (serialize);
return NULL;
}
FcCache *
FcDirCacheRebuild (FcCache *cache, struct stat *dir_stat, FcStrSet *dirs)
{
FcCache *new;
FcFontSet *set = FcFontSetDeserialize (FcCacheSet (cache));
const FcChar8 *dir = FcCacheDir (cache);
new = FcDirCacheBuild (set, dir, dir_stat, dirs);
FcFontSetDestroy (set);
return new;
}
/* write serialized state to the cache file */
FcBool
FcDirCacheWrite (FcCache *cache, FcConfig *config)
{
FcChar8 *dir = FcCacheDir (cache);
FcChar8 cache_base[CACHEBASE_LEN];
FcChar8 *cache_hashed;
int fd;
FcAtomic *atomic;
FcStrList *list;
FcChar8 *cache_dir = NULL;
FcChar8 *test_dir, *d = NULL;
FcCacheSkip *skip;
struct stat cache_stat;
unsigned int magic;
int written;
const FcChar8 *sysroot = FcConfigGetSysRoot (config);
/*
* Write it to the first directory in the list which is writable
*/
list = FcStrListCreate (config->cacheDirs);
if (!list)
return FcFalse;
while ((test_dir = FcStrListNext (list)))
{
if (d)
FcStrFree (d);
if (sysroot)
d = FcStrBuildFilename (sysroot, test_dir, NULL);
else
d = FcStrCopyFilename (test_dir);
if (access ((char *) d, W_OK) == 0)
{
cache_dir = FcStrCopyFilename (d);
break;
}
else
{
/*
* If the directory doesn't exist, try to create it
*/
if (access ((char *) d, F_OK) == -1) {
if (FcMakeDirectory (d))
{
cache_dir = FcStrCopyFilename (d);
/* Create CACHEDIR.TAG */
FcDirCacheCreateTagFile (d);
break;
}
}
/*
* Otherwise, try making it writable
*/
else if (chmod ((char *) d, 0755) == 0)
{
cache_dir = FcStrCopyFilename (d);
/* Try to create CACHEDIR.TAG too */
FcDirCacheCreateTagFile (d);
break;
}
}
}
if (d)
FcStrFree (d);
FcStrListDone (list);
if (!cache_dir)
return FcFalse;
FcDirCacheBasename (dir, cache_base);
cache_hashed = FcStrBuildFilename (cache_dir, cache_base, NULL);
if (!cache_hashed)
return FcFalse;
FcStrFree (cache_dir);
if (FcDebug () & FC_DBG_CACHE)
printf ("FcDirCacheWriteDir dir \"%s\" file \"%s\"\n",
dir, cache_hashed);
atomic = FcAtomicCreate ((FcChar8 *)cache_hashed);
if (!atomic)
goto bail1;
if (!FcAtomicLock (atomic))
goto bail3;
fd = FcOpen((char *)FcAtomicNewFile (atomic), O_RDWR | O_CREAT | O_BINARY, 0666);
if (fd == -1)
goto bail4;
/* Temporarily switch magic to MMAP while writing to file */
magic = cache->magic;
if (magic != FC_CACHE_MAGIC_MMAP)
cache->magic = FC_CACHE_MAGIC_MMAP;
/*
* Write cache contents to file
*/
written = write (fd, cache, cache->size);
/* Switch magic back */
if (magic != FC_CACHE_MAGIC_MMAP)
cache->magic = magic;
if (written != cache->size)
{
perror ("write cache");
goto bail5;
}
close(fd);
if (!FcAtomicReplaceOrig(atomic))
goto bail4;
/* If the file is small, update the cache chain entry such that the
* new cache file is not read again. If it's large, we don't do that
* such that we reload it, using mmap, which is shared across processes.
*/
if (cache->size < FC_CACHE_MIN_MMAP && FcStat (cache_hashed, &cache_stat))
{
lock_cache ();
if ((skip = FcCacheFindByAddrUnlocked (cache)))
{
skip->cache_dev = cache_stat.st_dev;
skip->cache_ino = cache_stat.st_ino;
skip->cache_mtime = cache_stat.st_mtime;
}
unlock_cache ();
}
FcStrFree (cache_hashed);
FcAtomicUnlock (atomic);
FcAtomicDestroy (atomic);
return FcTrue;
bail5:
close (fd);
bail4:
FcAtomicUnlock (atomic);
bail3:
FcAtomicDestroy (atomic);
bail1:
FcStrFree (cache_hashed);
return FcFalse;
}
FcBool
FcDirCacheClean (const FcChar8 *cache_dir, FcBool verbose)
{
DIR *d;
struct dirent *ent;
FcChar8 *dir;
FcBool ret = FcTrue;
FcBool remove;
FcCache *cache;