diff options
| author | Michael I. Bushnell <mib@gnu.org> | 1996-04-02 14:18:49 +0000 |
|---|---|---|
| committer | Michael I. Bushnell <mib@gnu.org> | 1996-04-02 14:18:49 +0000 |
| commit | 56cd00a8f29eef06941758fb07a27a42cbbfaca5 (patch) | |
| tree | bde276fa582bd010641dd8a4ba105da3fff43d57 /libnetfs/io-read.c | |
| parent | 0c06d5bb0f5a4892b9076bdbef9b68923919b8d8 (diff) | |
(netfs_S_io_read): Verify that the user has the file open for reading.
Diffstat (limited to 'libnetfs/io-read.c')
| -rw-r--r-- | libnetfs/io-read.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/libnetfs/io-read.c b/libnetfs/io-read.c index 29b70a45..0cb257af 100644 --- a/libnetfs/io-read.c +++ b/libnetfs/io-read.c @@ -1,5 +1,5 @@ /* - Copyright (C) 1995 Free Software Foundation, Inc. + Copyright (C) 1995, 1996 Free Software Foundation, Inc. Written by Michael I. Bushnell, p/BSG. This file is part of the GNU Hurd. @@ -34,6 +34,14 @@ netfs_S_io_read (struct protid *user, if (!user) return EOPNOTSUPP; + mutex_lock (&user->po->np->lock); + + if ((user->po->openstat & O_READ) == 0) + { + mutex_unlock (&user->po->np->lock); + return EBADF; + } + if (amount > *datalen) { alloced = 1; @@ -41,7 +49,6 @@ netfs_S_io_read (struct protid *user, } *datalen = amount; - mutex_lock (&user->po->np->lock); err = netfs_attempt_read (user->credential, user->po->np, offset == -1 ? user->po->filepointer : offset, datalen, *data); |