Make minio server compile on OpenBSD, NetBSD, Solaris (#3719)

pkg/lock/lock_solaris.go

@@ -0,0 +1,83 @@
+// +build solaris
+
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package lock
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+)
+
+// LockedOpenFile - initializes a new lock and protects
+// the file from concurrent access across mount points.
+// This implementation doesn't support all the open
+// flags and shouldn't be considered as replacement
+// for os.OpenFile().
+func LockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
+	var lock syscall.Flock_t
+	lock.Start = 0
+	lock.Len = 0
+	lock.Pid = 0
+
+	var lockType int16
+	switch flag {
+	case syscall.O_RDONLY:
+		lockType = syscall.F_RDLCK
+	case syscall.O_WRONLY:
+		fallthrough
+	case syscall.O_RDWR:
+		fallthrough
+	case syscall.O_WRONLY | syscall.O_CREAT:
+		fallthrough
+	case syscall.O_RDWR | syscall.O_CREAT:
+		lockType = syscall.F_WRLCK
+	default:
+		return nil, fmt.Errorf("Unsupported flag (%d)", flag)
+	}
+
+	lock.Type = lockType
+	lock.Whence = 0
+
+	f, err := os.OpenFile(path, flag, perm)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = syscall.FcntlFlock(f.Fd(), syscall.F_SETLKW, &lock); err != nil {
+		f.Close()
+		return nil, err
+	}
+
+	st, err := os.Stat(path)
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+
+	if st.IsDir() {
+		f.Close()
+		return nil, &os.PathError{
+			Op:   "open",
+			Path: path,
+			Err:  syscall.EISDIR,
+		}
+	}
+
+	return &LockedFile{f}, nil
+}