fix tsm1 for Solaris #4787, passes unit tests now

tsdb/engine/tsm1/mmap_solaris.go

@@ -0,0 +1,33 @@
+// +build solaris
+
+package tsm1
+
+import (
+	"os"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+
+func mmap(f *os.File, offset int64, length int) ([]byte, error) {
+	mmap, err := unix.Mmap(int(f.Fd()), 0, length, syscall.PROT_READ, syscall.MAP_SHARED)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := unix.Madvise(mmap, syscall.MADV_RANDOM); err != nil {
+		return nil, err
+	}
+
+	return mmap, nil
+}
+
+func munmap(b []byte) (err error) {
+	return unix.Munmap(b)
+}
+
+// From: github.com/boltdb/bolt/bolt_unix.go
+func madvise(b []byte, advice int) (err error) {
+	return unix.Madvise(b, advice)
+}