Function createLockDirectory

src/common/os/posix/os_utils.cpp:173–266

create directory for lock files and set appropriate access rights

// create directory for lock files and set appropriate access rights
void createLockDirectory(const char* pathname)
{
	struct STAT st;
	for(;;)
	{
		if (access(pathname, R_OK | W_OK | X_OK) == 0)
		{
			if (os_utils::stat(pathname, &st) != 0)
				system_call_failed::raise("stat", pathname);
			if (S_ISDIR(st.st_mode))
				return;
			// not exactly original meaning, but very close to it
			system_call_failed::raise("mkdir", pathname, ENOTDIR);
		}

		if (SYSCALL_INTERRUPTED(errno))
			continue;
		if (errno == ENOENT)
			break;
		system_call_failed::raise("access", pathname);
	}

	Firebird::PathName newname(pathname);
	newname.rtrim("/");
	newname += ".tmp.XXXXXX";
	char* pathname2 = newname.begin();

	while (!mkdtemp(pathname2))
	{
		if (SYSCALL_INTERRUPTED(errno))
			continue;
		(Arg::Gds(isc_lock_dir_access) << pathname2).raise();
	}
	changeFileRights(pathname2, 0770);

	Firebird::PathName renameGuard(pathname2);
	renameGuard += "/fb_rename_guard";
	for(;;)
	{
		int gfd = creat(renameGuard.c_str(), 0600);
		if (gfd >= 0)
		{
			close(gfd);
			break;
		}
		if (SYSCALL_INTERRUPTED(errno))
			continue;
		(Arg::Gds(isc_lock_dir_access) << renameGuard).raise();
	}

	while (rename(pathname2, pathname) != 0)
	{
		if (SYSCALL_INTERRUPTED(errno))
			continue;

		if (errno == EEXIST || errno == ENOTEMPTY)
		{
			while (unlink(renameGuard.c_str()) != 0)