1/*- 2 * See the file LICENSE for redistribution information. 3 * 4 * Copyright (c) 1997,2008 Oracle. All rights reserved. 5 * 6 * $Id: os_seek.c,v 1.7 2008/01/08 20:58:44 bostic Exp $ 7 */ 8 9#include "db_config.h" 10 11#include "db_int.h" 12 13/* 14 * __os_seek -- 15 * Seek to a page/byte offset in the file. 16 */ 17int 18__os_seek(env, fhp, pgno, pgsize, relative) 19 ENV *env; 20 DB_FH *fhp; 21 db_pgno_t pgno; 22 u_int32_t pgsize; 23 u_int32_t relative; 24{ 25 off_t offset; 26 int ret; 27 28#if defined(HAVE_STATISTICS) 29 ++fhp->seek_count; 30#endif 31 32 offset = (off_t)pgsize * pgno + relative; 33 34 /* 35 * Use BREW's lseek function IFILE_Seek. If the seek fails, the source 36 * returns EBADSEEKPOS. 37 */ 38 ret = IFILE_Seek(fhp->ifp, _SEEK_START, offset); 39 40 if (ret == SUCCESS) { 41 fhp->pgsize = pgsize; 42 fhp->pgno = pgno; 43 fhp->offset = relative; 44 ret = 0; 45 } else { 46 __db_syserr(env, ret, 47 "seek: %lu: (%lu * %lu) + %lu", (u_long)offset, 48 (u_long)pgno, (u_long)pgsize, (u_long)relative); 49 ret = __os_posix_err(ret); 50 } 51 52 return (ret); 53} 54