diff options
Diffstat (limited to 'libnetfs/io-seek.c')
-rw-r--r-- | libnetfs/io-seek.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libnetfs/io-seek.c b/libnetfs/io-seek.c new file mode 100644 index 00000000..1e517ff4 --- /dev/null +++ b/libnetfs/io-seek.c @@ -0,0 +1,63 @@ +/* + Copyright (C) 1995, 1996 Free Software Foundation, Inc. + Written by Michael I. Bushnell, p/BSG. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include <unistd.h> +#include "netfs.h" +#include "io_S.h" + +error_t +netfs_S_io_seek (struct protid *user, + off_t offset, + int whence, + off_t *newoffset) +{ + error_t err; + + if (!user) + return EOPNOTSUPP; + + mutex_lock (&user->po->np->lock); + switch (whence) + { + case SEEK_SET: + err = 0; + user->po->filepointer = offset; + break; + + case SEEK_CUR: + err = 0; + user->po->filepointer += offset; + break; + + case SEEK_END: + err = netfs_validate_stat (user->po->np, user->user); + if (!err) + user->po->filepointer = user->po->np->nn_stat.st_size + offset; + break; + + default: + err = EINVAL; + break; + } + *newoffset = user->po->filepointer; + mutex_unlock (&user->po->np->lock); + return err; +} + |