Add support for solaris - fix #69

Signed-off-by: kuba-- <[email protected]>

Author: kuba--

osfs/os_posix.go

@@ -1,4 +1,4 @@
-// +build !windows
+// +build !windows,!solaris
 
 package osfs
 

osfs/os_solaris.go

@@ -0,0 +1,19 @@
+// +build solaris
+
+package osfs
+
+import "syscall"
+
+func (f *file) Lock() error {
+	f.m.Lock()
+	defer f.m.Unlock()
+
+	return syscall.Flock(int(f.File.Fd()), syscall.LOCK_EX)
+}
+
+func (f *file) Unlock() error {
+	f.m.Lock()
+	defer f.m.Unlock()
+
+	return syscall.Flock(int(f.File.Fd()), syscall.LOCK_UN)
+}