FcBool FcAtomicLock(FcAtomic *atomic) {
int ret;
struct stat lck_stat;
#ifdef HAVE_LINK
int fd = -1;
FILE *f = 0;
FcBool no_link = FcFalse;
strcpy((char *)atomic->tmp, (char *)atomic->file);
strcat((char *)atomic->tmp, TMP_NAME);
fd = FcMakeTempfile((char *)atomic->tmp);
if (fd < 0) return FcFalse;
f = fdopen(fd, "w");
if (!f) {
close(fd);
unlink((char *)atomic->tmp);
return FcFalse;
}
ret = fprintf(f, "%ld\n", (long)getpid());
if (ret <= 0) {
fclose(f);
unlink((char *)atomic->tmp);
return FcFalse;
}
if (fclose(f) == EOF) {
unlink((char *)atomic->tmp);
return FcFalse;
}
ret = link((char *)atomic->tmp, (char *)atomic->lck);
if (ret < 0 && errno == EPERM) {
/* the filesystem where atomic->lck points to may not supports
* the hard link. so better try to fallback
*/
ret = mkdir((char *)atomic->lck, 0600);
no_link = FcTrue;
}
(void)unlink((char *)atomic->tmp);
#else
ret = mkdir((char *)atomic->lck, 0600);
#endif
if (ret < 0) {
/*
* If the file is around and old (> 10 minutes),
* assume the lock is stale. This assumes that any
* machines sharing the same filesystem will have clocks
* reasonably close to each other.
*/
if (FcStat(atomic->lck, &lck_stat) >= 0) {
time_t now = time(0);
if ((long int)(now - lck_stat.st_mtime) > 10 * 60) {
#ifdef HAVE_LINK
if (no_link) {
if (rmdir((char *)atomic->lck) == 0)
return FcAtomicLock(atomic);
} else {
if (unlink((char *)atomic->lck) == 0)
return FcAtomicLock(atomic);
}
#else
if (rmdir((char *)atomic->lck) == 0)
return FcAtomicLock(atomic);
#endif
}
}
return FcFalse;
}
(void)unlink((char *)atomic->new_file);
return FcTrue;
}
void addDir(const QString &dir, bool system)
{
QDomDocument doc("fontconfig");
QString fileName=getConfigFile(system);
QFile f(fileName);
bool hasDir(false);
KFI_DBUG << "Using fontconfig file:" << fileName;
// Load existing file - and check to see whether it has the dir...
if(f.open(QIODevice::ReadOnly))
{
doc.clear();
if(doc.setContent(&f))
{
QDomNode n = doc.documentElement().firstChild();
while(!n.isNull() && !hasDir)
{
QDomElement e = n.toElement();
if(!e.isNull() && "dir"==e.tagName())
if(0==Misc::expandHome(Misc::dirSyntax(e.text())).indexOf(dir))
hasDir=true;
n=n.nextSibling();
}
}
f.close();
}
// Add dir, and save, if config does not already have this dir.
if(!hasDir)
{
if(doc.documentElement().isNull())
doc.appendChild(doc.createElement("fontconfig"));
QDomElement newNode = doc.createElement("dir");
QDomText text = doc.createTextNode(Misc::contractHome(xDirSyntax(dir)));
newNode.appendChild(text);
doc.documentElement().appendChild(newNode);
FcAtomic *atomic=FcAtomicCreate((const unsigned char *)(QFile::encodeName(fileName).data()));
if(atomic)
{
if(FcAtomicLock(atomic))
{
FILE *f=fopen((char *)FcAtomicNewFile(atomic), "w");
if(f)
{
//
// Check document syntax...
static const char qtXmlHeader[] = "<?xml version = '1.0'?>";
static const char xmlHeader[] = "<?xml version=\"1.0\"?>";
static const char qtDocTypeLine[] = "<!DOCTYPE fontconfig>";
static const char docTypeLine[] = "<!DOCTYPE fontconfig SYSTEM "
"\"fonts.dtd\">";
QString str(doc.toString());
int idx;
if(0!=str.indexOf("<?xml"))
str.insert(0, xmlHeader);
else if(0==str.indexOf(qtXmlHeader))
str.replace(0, strlen(qtXmlHeader), xmlHeader);
if(-1!=(idx=str.indexOf(qtDocTypeLine)))
str.replace(idx, strlen(qtDocTypeLine), docTypeLine);
//
// Write to file...
fputs(str.toUtf8(), f);
fclose(f);
if(!FcAtomicReplaceOrig(atomic))
FcAtomicDeleteNew(atomic);
}
FcAtomicUnlock(atomic);
}
FcAtomicDestroy(atomic);
}
}
}
