Index: libcfa/src/concurrency/iocall.cfa
===================================================================
--- libcfa/src/concurrency/iocall.cfa	(revision fb984625dd318d246ca225fa8999bd6ef486caea)
+++ libcfa/src/concurrency/iocall.cfa	(revision 0a92c78eaf38909867274eedca088fb377a6e64c)
@@ -108,4 +108,7 @@
 
 	extern ssize_t read (int fd, void *buf, size_t count);
+
+	extern ssize_t splice(int fd_in, loff_t *off_in, int fd_out, loff_t *off_out, size_t len, unsigned int flags);
+	extern ssize_t tee(int fd_in, int fd_out, size_t len, unsigned int flags);
 }
 
@@ -329,5 +332,4 @@
 }
 
-
 ssize_t cfa_read(int fd, void *buf, size_t count) {
 	#if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_READ)
@@ -349,4 +351,33 @@
 
 		(*sqe){ IORING_OP_WRITE, fd, buf, count, 0 };
+
+		__submit_wait
+	#endif
+}
+
+ssize_t cfa_splice(int fd_in, loff_t *off_in, int fd_out, loff_t *off_out, size_t len, unsigned int flags) {
+	#if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SPLICE)
+		return splice( fd_in, off_in, fd_out, off_out, len, flags );
+	#else
+		__submit_prelude
+
+		(*sqe){ IORING_OP_SPLICE, fd_out, 0p, len, off_out };
+		sqe->splice_fd_in  = fd_in;
+		sqe->splice_off_in = off_in;
+		sqe->splice_flags  = flags;
+
+		__submit_wait
+	#endif
+}
+
+ssize_t cfa_tee(int fd_in, int fd_out, size_t len, unsigned int flags) {
+	#if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_TEE)
+		return tee( fd_in, fd_out, len, flags );
+	#else
+		__submit_prelude
+
+		(*sqe){ IORING_OP_TEE, fd_out, 0p, len, 0 };
+		sqe->splice_fd_in = fd_in;
+		sqe->splice_flags = flags;
 
 		__submit_wait
@@ -453,4 +484,14 @@
 			#define _CFA_IO_FEATURE_IORING_OP_WRITE ,
 			return IS_DEFINED(IORING_OP_WRITE);
+
+		if( /*func == (fptr_t)splice || */
+			func == (fptr_t)cfa_splice )
+			#define _CFA_IO_FEATURE_IORING_OP_SPLICE ,
+			return IS_DEFINED(IORING_OP_SPLICE);
+
+		if( /*func == (fptr_t)tee || */
+			func == (fptr_t)cfa_tee )
+			#define _CFA_IO_FEATURE_IORING_OP_TEE ,
+			return IS_DEFINED(IORING_OP_TEE);
 	#endif