/* Copyright (C) 1994, 1995, 1996 Free Software Foundation This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "priv.h" #include "io_S.h" #include /* Implement io_readable as described in . */ kern_return_t diskfs_S_io_readable (struct protid *cred, mach_msg_type_number_t *amount) { struct node *np; if (!cred) return EOPNOTSUPP; if (!(cred->po->openstat & O_READ)) return EINVAL; np = cred->po->np; pthread_mutex_lock (&np->lock); iohelp_get_conch (&np->conch); if (np->dn_stat.st_size > cred->po->filepointer) *amount = np->dn_stat.st_size - cred->po->filepointer; else *amount = 0; pthread_mutex_unlock (&np->lock); return 0; }