#ifndef lint static char sccsid[] = "@(#)iob.c 1.1 92/07/30 Copyr 1986 Sun Micro"; #endif /* * Copyright (c) 1986 by Sun Microsystems, Inc. */ /* * Utility routines to deal with the internal IOB file * structures used by boot. */ #include #include #include #include #include "boot/vnode.h" #include #include "boot/inode.h" #include "boot/iob.h" /* These are the pools of buffers, iob's, etc. */ extern char b[NBUFS][MAXBSIZE]; extern daddr_t blknos[NBUFS]; extern struct iob iob[NFILES]; static int dump_debug = 10; static int openfirst = 1; /* * Allocate an IOB for a newly opened file. Simple linear * search of IOB table for an unused IOB. Return the index * of an unused table entry if found, else exit. Initialise * the table on the first call to this routine. */ int getiob() { register int fdesc; #ifdef DUMP_DEBUG dprint (dump_debug, 6, "getiob()\n"); #endif if (openfirst != 0) { openfirst = 0; for (fdesc = 0; fdesc < NFILES; fdesc++) iob[fdesc].i_flgs = IOB_UNUSED; } for (fdesc = 0; fdesc < NFILES; fdesc++) { if (iob[fdesc].i_flgs == IOB_UNUSED) { (&iob[fdesc])->i_flgs |= F_ALLOC; return fdesc; } } _stop("No more file slots"); /*NOTREACHED*/ } ungetiob(fdesc) int fdesc; { if ((fdesc < 0) || (fdesc >= NFILES)) { dprint (dump_debug, 10, "ungetiob: bad fdesc 0x%x\n", fdesc); return (-1); } iob[fdesc].i_flgs = IOB_UNUSED; return (0); }
