File system stuff.

src/libfs/write.c

@@ -0,0 +1,46 @@
+/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
+/* See COPYRIGHT */
+
+#include <u.h>
+#include <libc.h>
+#include <fcall.h>
+#include <fs.h>
+#include "fsimpl.h"
+
+long
+fspwrite(Fid *fd, void *buf, long n, vlong offset)
+{
+	Fcall tx, rx;
+	void *freep;
+
+	tx.type = Tread;
+	if(offset == -1){
+		qlock(&fd->lk);
+		tx.offset = fd->offset;
+		fd->offset += n;
+		qunlock(&fd->lk);
+	}else
+		tx.offset = offset;
+	tx.count = n;
+	tx.data = buf;
+
+	fsrpc(fd->fs, &tx, &rx, &freep);
+	if(rx.type == Rerror){
+		if(offset == -1){
+			qlock(&fd->lk);
+			fd->offset -= n;
+			qunlock(&fd->lk);
+		}
+		werrstr("%s", rx.ename);
+		free(freep);
+		return -1;
+	}
+	free(freep);
+	return rx.count;
+}
+
+long
+fswrite(Fid *fd, void *buf, long n)
+{
+	return fspwrite(fd, buf, n, -1);
+}