Use splice/tee to connect vsys clients and servers.

[vsys.git] / splice_stub.c

diff --git a/splice_stub.c b/splice_stub.c
new file mode 100644 (file)
index 0000000..a8da686
--- /dev/null
+++ b/splice_stub.c
@@ -0,0 +1,42 @@
+/* This module allows data between vsys clients and servers to be copied in kernel -
+ * and some of these copies to be eliminated through page rewrites */
+
+#define SPLICE_SYSCALL 313
+#define TEE_SYSCALL    315
+#define SPLICE_F_NONBLOCK 0x02
+
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/syscall.h>
+#include <caml/mlvalues.h>
+#include <caml/memory.h>
+#include <caml/alloc.h>
+#include <caml/custom.h>
+#include <caml/fail.h>
+#include <caml/signals.h>
+
+CAMLprim value stub_splice(value fd_in, value fd_out, value len)
+{
+        CAMLparam3(fd_in, fd_out, len);
+       long ret;
+        ret = syscall(SPLICE_SYSCALL, Int_val(fd_in), NULL, Int_val(fd_out),NULL, Int_val(len), SPLICE_F_NONBLOCK);
+        if (ret == -1) {
+               printf ("Splice error: %s\n", strerror(errno));
+                caml_failwith("Splice system call returned -1");
+       }
+        CAMLreturn(Val_int(ret));
+}
+
+CAMLprim value stub_tee(value fd_in, value fd_out, value len)
+{
+        CAMLparam3(fd_in, fd_out, len);
+       long ret;
+        ret = syscall(TEE_SYSCALL,Int_val(fd_in), Int_val(fd_out), Int_val(len), SPLICE_F_NONBLOCK);
+        if (ret == -1) {
+               printf ("Sendfile error: %s\n", strerror(errno));
+                caml_failwith("Splice system call returned -1");
+       }
+        CAMLreturn(Val_int(ret));
+}