v1.0.0

common/buf/readv_posix.go

@@ -0,0 +1,47 @@
+// +build !windows
+// +build !wasm
+// +build !illumos
+
+package buf
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+type posixReader struct {
+	iovecs []syscall.Iovec
+}
+
+func (r *posixReader) Init(bs []*Buffer) {
+	iovecs := r.iovecs
+	if iovecs == nil {
+		iovecs = make([]syscall.Iovec, 0, len(bs))
+	}
+	for idx, b := range bs {
+		iovecs = append(iovecs, syscall.Iovec{
+			Base: &(b.v[0]),
+		})
+		iovecs[idx].SetLen(int(Size))
+	}
+	r.iovecs = iovecs
+}
+
+func (r *posixReader) Read(fd uintptr) int32 {
+	n, _, e := syscall.Syscall(syscall.SYS_READV, fd, uintptr(unsafe.Pointer(&r.iovecs[0])), uintptr(len(r.iovecs)))
+	if e != 0 {
+		return -1
+	}
+	return int32(n)
+}
+
+func (r *posixReader) Clear() {
+	for idx := range r.iovecs {
+		r.iovecs[idx].Base = nil
+	}
+	r.iovecs = r.iovecs[:0]
+}
+
+func newMultiReader() multiReader {
+	return &posixReader{}
+}