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-rw-r--r--libtrivfs/file-lock.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/libtrivfs/file-lock.c b/libtrivfs/file-lock.c
new file mode 100644
index 00000000..70e65c7e
--- /dev/null
+++ b/libtrivfs/file-lock.c
@@ -0,0 +1,39 @@
+/*
+ Copyright (C) 1994 Free Software Foundation
+
+ This program 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.
+
+ This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+static struct mutex lock = MUTEX_INITIALIZER;
+static struct lock_box lockbox;
+static int inited = 0;
+
+error_t
+trivfs_S_file_lock (struct protid *cred, int flags)
+{
+ error_t err;
+
+ mutex_lock (&lock);
+ if (!inited)
+ {
+ fshelp_lock_init (&lockbox);
+ inited = 1;
+ }
+ err = fshelp_acquire_lock (&lockbox, &cred->po->lock_status, &lock, flags);
+ mutex_unlock (&lock);
+ return err;
+}
+