Function CloseTransientFile

src/backend/storage/file/fd.c:2731–2751

* Close a file returned by OpenTransientFile. * * Note we do not check close's return value --- it is up to the caller * to handle close errors. */

 * to handle close errors.
 */
int
CloseTransientFile(int fd)
{
	int			i;

	DO_DB(elog(LOG, "CloseTransientFile: Allocated %d", numAllocatedDescs));

	/* Remove fd from list of allocated files, if it's present */
	for (i = numAllocatedDescs; --i >= 0;)
	{
		AllocateDesc *desc = &allocatedDescs[i];

		if (desc->kind == AllocateDescRawFD && desc->desc.fd == fd)
			return FreeDesc(desc);
	}

	/* Only get here if someone passes us a file not in allocatedDescs */
	elog(WARNING, "fd passed to CloseTransientFile was not obtained from OpenTransientFile");

	return close(fd);
}

/*
 * Routines that want to use <dirent.h> (ie, DIR*) should use AllocateDir