diff options
Diffstat (limited to 'db-4.8.30/os/os_seek.c')
-rw-r--r-- | db-4.8.30/os/os_seek.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/db-4.8.30/os/os_seek.c b/db-4.8.30/os/os_seek.c new file mode 100644 index 0000000..7c9c9e9 --- /dev/null +++ b/db-4.8.30/os/os_seek.c @@ -0,0 +1,64 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1997-2009 Oracle. All rights reserved. + * + * $Id$ + */ + +#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); +} |