Function SharedFileSetCreate

src/backend/storage/file/sharedfileset.c:153–176

* Create a new file in the given set. */

 * Create a new file in the given set.
 */
File
SharedFileSetCreate(SharedFileSet *fileset, const char *name)
{
	char		path[MAXPGPATH];
	File		file;

	SharedFilePath(path, fileset, name);
	file = PathNameCreateTemporaryFile(path, false);

	/* If we failed, see if we need to create the directory on demand. */
	if (file <= 0)
	{
		char		tempdirpath[MAXPGPATH];
		char		filesetpath[MAXPGPATH];
		Oid			tablespace = ChooseTablespace(fileset, name);

		TempTablespacePath(tempdirpath, tablespace);
		SharedFileSetPath(filesetpath, fileset, tablespace);
		PathNameCreateTemporaryDir(tempdirpath, filesetpath);
		file = PathNameCreateTemporaryFile(path, true);
	}

	return file;
}

/*
 * Open a file that was created with SharedFileSetCreate(), possibly in