support linux

storage/file_linux.go

@@ -1,3 +1,56 @@
 //go:build linux
 
 package storage
+
+import (
+	"syscall"
+)
+
+type linuxFile struct {
+	fd       int
+	filename string
+}
+
+func (f *linuxFile) Close() error {
+	if f.fd != -1 {
+		if err := syscall.Close(f.fd); err != nil {
+			return err
+		}
+		f.fd = -1
+	}
+	return nil
+}
+
+func (f *linuxFile) Read(p []byte) (n int, err error) {
+	return syscall.Read(f.fd, p)
+}
+
+func (f *linuxFile) Write(p []byte) (n int, err error) {
+	return syscall.Write(f.fd, p)
+}
+
+func (f *linuxFile) Seek(offset int64, whence int) (int64, error) {
+	return syscall.Seek(f.fd, offset, whence)
+}
+
+func (f *linuxFile) Flush() error {
+	return syscall.Fsync(f.fd)
+}
+
+func (f *linuxFile) Path() string {
+	return f.filename
+}
+
+func OpenFile(filename string, readonly bool) (File, error) {
+	var access int
+	if readonly {
+		access = syscall.O_RDONLY
+	} else {
+		access = syscall.O_RDWR
+	}
+	fd, err := syscall.Open(filename, syscall.O_CLOEXEC|syscall.O_CREAT|access, 0666)
+	if err != nil {
+		return nil, err
+	}
+	return &linuxFile{fd: fd, filename: filename}, nil
+}