feat(c/libuv): Add io, fs, signal, core, poll features

Signed-off-by: hackerchai <i@hackerchai.com>

feat(c/libuv): Add io, fs, signal features

Signed-off-by: hackerchai <i@hackerchai.com>

refactor(c/libuv): rename io into libuv

Signed-off-by: hackerchai <i@hackerchai.com>

fix(c/libuv): fix some compile errors

Signed-off-by: hackerchai <i@hackerchai.com>

c/libuv/libuv.go

@@ -0,0 +1,141 @@
+package libuv
+
+import (
+	"github.com/goplus/llgo/c"
+	_ "unsafe"
+)
+
+const (
+	LLGoPackage = "link: $(pkg-config --libs libuv); -luv"
+)
+
+// ----------------------------------------------
+
+const (
+	RUN_DEFAULT RunMode = iota
+	RUN_ONCE
+	RUN_NOWAIT
+)
+
+type RunMode int
+
+// ----------------------------------------------
+
+/* Handle types. */
+
+type Loop struct {
+	Unused [0]byte
+}
+
+type Handle struct {
+	Unused [0]byte
+}
+
+type Buf struct {
+	Base *c.Char
+	Len  uintptr
+}
+
+// ----------------------------------------------
+
+/* Function type */
+
+// llgo:type C
+type WalkCb func(handle *Handle, arg c.Pointer)
+
+// ----------------------------------------------
+
+//go:linkname LoopSize C.uv_loop_size
+func LoopSize() uintptr
+
+// llgo:link (*Loop).Init C.uv_loop_init
+func (loop *Loop) Init() c.Int {
+	return 0
+}
+
+// llgo:link (*Loop).Run C.uv_loop_run
+func (l *Loop) Run(mode c.Int) c.Int {
+	return 0
+}
+
+// llgo:link (*Loop).Stop C.uv_loop_stop
+func (l *Loop) Stop() {
+	return
+}
+
+// llgo:link (*Loop).Default  C.uv_default_loop
+func (l *Loop) Default() *Loop {
+	return nil
+}
+
+// llgo:link (*Loop).New C.uv_loop_new
+func (l *Loop) New() *Loop {
+	return nil
+}
+
+// Deprecated: use LoopClose instead.
+// llgo:link (*Loop).Delete C.uv_loop_delete
+func (l *Loop) Delete() {
+	return
+}
+
+// llgo:link (*Loop).Alive C.uv_loop_alive
+func (l *Loop) Alive() c.Int {
+	return 0
+}
+
+// llgo:link (*Loop).Close C.uv_loop_close
+func (l *Loop) Close() c.Int {
+	return 0
+}
+
+// llgo:link (*Loop).Configure C.uv_loop_configure
+func (l *Loop) Configure(loop *Loop, option c.Int, arg c.Int) c.Int {
+	return 0
+}
+
+// llgo:link (*Loop).Walk C.uv_walk
+func (loop *Loop) Walk(walkCb WalkCb, arg c.Pointer) {}
+
+// llgo:link (*Loop).Fork C.uv_loop_fork
+func (l *Loop) Fork(loop *Loop) int {
+	return 0
+}
+
+// llgo:link (*Loop).UpdateTime C.uv_update_time
+func (l *Loop) UpdateTime() {
+	return
+}
+
+// llgo:link (*Loop).Now C.uv_now
+func (l *Loop) Now() uint64 {
+	return 0
+}
+
+// llgo:link (*Loop).BackendFd C.uv_backend_fd
+func (l *Loop) BackendFd() int {
+	return 0
+}
+
+// llgo:link (*Loop).BackendTimeout C.uv_backend_timeout
+func (l *Loop) BackendTimeout() int {
+	return 0
+}
+
+// llgo:link (*Handle).Ref C.uv_ref
+func (h *Handle) Ref() {
+	return
+}
+
+// llgo:link (*Handle).Unref C.uv_unref
+func (h *Handle) Unref() {
+	return
+}
+
+// llgo:link (*Handle).HasRef C.uv_has_ref
+func (h *Handle) HasRef() int {
+	return 0
+}
+
+//go:linkname InitBuf C.uv_buf_init
+func InitBuf(base *c.Char, len c.Uint) Buf