65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997,2008 Oracle. All rights reserved.
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*
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* $Id: os_seek.c 63573 2008-05-23 21:43:21Z trent.nelson $
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*/
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#include "db_config.h"
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#include "db_int.h"
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/*
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* __os_seek --
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* Seek to a page/byte offset in the file.
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*
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* PUBLIC: int __os_seek __P((ENV *,
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* PUBLIC: DB_FH *, db_pgno_t, u_int32_t, u_int32_t));
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*/
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int
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__os_seek(env, fhp, pgno, pgsize, relative)
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ENV *env;
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DB_FH *fhp;
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db_pgno_t pgno;
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u_int32_t pgsize;
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u_int32_t relative;
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{
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DB_ENV *dbenv;
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off_t offset;
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int ret;
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dbenv = env == NULL ? NULL : env->dbenv;
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DB_ASSERT(env, F_ISSET(fhp, DB_FH_OPENED) && fhp->fd != -1);
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#if defined(HAVE_STATISTICS)
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++fhp->seek_count;
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#endif
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offset = (off_t)pgsize * pgno + relative;
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if (dbenv != NULL && FLD_ISSET(dbenv->verbose, DB_VERB_FILEOPS_ALL))
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__db_msg(env,
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"fileops: seek %s to %lu", fhp->name, (u_long)offset);
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if (DB_GLOBAL(j_seek) != NULL)
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ret = DB_GLOBAL(j_seek)(fhp->fd, offset, SEEK_SET);
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else
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RETRY_CHK((lseek(
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fhp->fd, offset, SEEK_SET) == -1 ? 1 : 0), ret);
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if (ret == 0) {
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fhp->pgsize = pgsize;
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fhp->pgno = pgno;
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fhp->offset = relative;
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} else {
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__db_syserr(env, ret,
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"seek: %lu: (%lu * %lu) + %lu", (u_long)offset,
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(u_long)pgno, (u_long)pgsize, (u_long)relative);
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ret = __os_posix_err(ret);
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}
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return (ret);
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}
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