Auto merge of #635 - Susurrus:termios_again, r=alexcrichton

Finish off termios (hopefully!)

`cfmakesane` for FreeBSD and `tcgetsid` for everyone!

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -576,6 +576,7 @@ extern {
         msgtyp: ::c_long, msgflg: ::c_int) -> ::c_int;
     pub fn msgsnd(msqid: ::c_int, msgp: *const ::c_void, msgsz: ::size_t,
         msgflg: ::c_int) -> ::c_int;
+    pub fn cfmakesane(termios: *mut ::termios);
 }
 
 cfg_if! {

src/unix/mod.rs

@@ -863,6 +863,7 @@ extern {
                      termios: *const ::termios) -> ::c_int;
     pub fn tcflow(fd: ::c_int, action: ::c_int) -> ::c_int;
     pub fn tcflush(fd: ::c_int, action: ::c_int) -> ::c_int;
+    pub fn tcgetsid(fd: ::c_int) -> ::pid_t;
     pub fn tcsendbreak(fd: ::c_int, duration: ::c_int) -> ::c_int;
     pub fn mkstemp(template: *mut ::c_char) -> ::c_int;
     pub fn mkdtemp(template: *mut ::c_char) -> *mut ::c_char;