Import BSDDB 4.7.25 (as of svn r89086)

os/os_seek.c

@@ -0,0 +1,64 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997,2008 Oracle.  All rights reserved.
+ *
+ * $Id: os_seek.c 63573 2008-05-23 21:43:21Z trent.nelson $
+ */
+
+#include "db_config.h"
+
+#include "db_int.h"
+
+/*
+ * __os_seek --
+ *	Seek to a page/byte offset in the file.
+ *
+ * PUBLIC: int __os_seek __P((ENV *,
+ * PUBLIC:      DB_FH *, db_pgno_t, u_int32_t, u_int32_t));
+ */
+int
+__os_seek(env, fhp, pgno, pgsize, relative)
+	ENV *env;
+	DB_FH *fhp;
+	db_pgno_t pgno;
+	u_int32_t pgsize;
+	u_int32_t relative;
+{
+	DB_ENV *dbenv;
+	off_t offset;
+	int ret;
+
+	dbenv = env == NULL ? NULL : env->dbenv;
+
+	DB_ASSERT(env, F_ISSET(fhp, DB_FH_OPENED) && fhp->fd != -1);
+
+#if defined(HAVE_STATISTICS)
+	++fhp->seek_count;
+#endif
+
+	offset = (off_t)pgsize * pgno + relative;
+
+	if (dbenv != NULL && FLD_ISSET(dbenv->verbose, DB_VERB_FILEOPS_ALL))
+		__db_msg(env,
+		    "fileops: seek %s to %lu", fhp->name, (u_long)offset);
+
+	if (DB_GLOBAL(j_seek) != NULL)
+		ret = DB_GLOBAL(j_seek)(fhp->fd, offset, SEEK_SET);
+	else
+		RETRY_CHK((lseek(
+		    fhp->fd, offset, SEEK_SET) == -1 ? 1 : 0), ret);
+
+	if (ret == 0) {
+		fhp->pgsize = pgsize;
+		fhp->pgno = pgno;
+		fhp->offset = relative;
+	} else {
+		__db_syserr(env, ret,
+		    "seek: %lu: (%lu * %lu) + %lu", (u_long)offset,
+		    (u_long)pgno, (u_long)pgsize, (u_long)relative);
+		ret = __os_posix_err(ret);
+	}
+
+	return (ret);
+}