feat(syscall): add madvise, epollctl

Signed-off-by: Nugraha <26342994+ii64@users.noreply.github.com>

syscall/epoll.go

@@ -2,6 +2,7 @@ package syscall
 
 import (
 	"syscall"
+	"unsafe"
 
 	"github.com/ii64/gouring"
 )
@@ -9,7 +10,10 @@ import (
 var _ = syscall.EpollCtl
 
 // EpollCtl
-func EpollCtl(sqe *gouring.SQEntry, epfd int, op int, fd int, event *syscall.EpollEvent) (err error) {
+func EpollCtl(sqe *gouring.SQEntry, epfd int, op int, fd int, event *syscall.EpollEvent) {
 	sqe.Opcode = gouring.IORING_OP_EPOLL_CTL
-	return nil
+	sqe.Fd = int32(epfd)
+	*sqe.Addr() = uint64(uintptr(unsafe.Pointer(event)))
+	sqe.Len = uint32(op)
+	*sqe.Offset() = uint64(fd)
 }

syscall/helper.go

@@ -5,5 +5,7 @@ import (
 	_ "unsafe"
 )
 
+var _zero uintptr
+
 //go:linkname anyToSockaddr syscall.anyToSockaddr
 func anyToSockaddr(rsa *syscall.RawSockaddrAny) (syscall.Sockaddr, error)

syscall/mem.go

@@ -0,0 +1,25 @@
+package syscall
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/ii64/gouring"
+)
+
+var _ = syscall.Madvise
+
+// Madvise
+func Madvise(sqe *gouring.SQEntry, b []byte, advice int) {
+	var ptr unsafe.Pointer
+	if len(b) > 0 {
+		ptr = unsafe.Pointer(&b[0])
+	} else {
+		ptr = unsafe.Pointer(&_zero)
+	}
+	sqe.Opcode = gouring.IORING_OP_MADVISE
+	sqe.Fd = -1
+	*sqe.Addr() = uint64(uintptr(ptr))
+	sqe.Len = uint32(len(b))
+	*sqe.Offset() = 0
+}