std.os.termios: add/fix std.c.TCSA for BSDs

Author: mikdusan

lib/std/c/dragonfly.zig

@@ -557,6 +557,13 @@ pub const NOTE_FFCTRLMASK = 3221225472;
 pub const NOTE_FFCOPY = 3221225472;
 pub const NOTE_PCTRLMASK = 4026531840;
 
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
+};
+
 pub const stack_t = extern struct {
     sp: [*]u8,
     size: isize,

lib/std/c/freebsd.zig

@@ -1153,6 +1153,13 @@ pub const T = struct {
     pub const IOCSIG = 0x2004745f;
 };
 
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
+};
+
 pub const winsize = extern struct {
     ws_row: u16,
     ws_col: u16,

lib/std/c/netbsd.zig

@@ -806,12 +806,11 @@ pub const T = struct {
     pub const IOCXMTFRAME = 0x80087444;
 };
 
-// Commands passed to tcsetattr() for setting the termios structure.
-pub const TCSA = struct {
-    pub const NOW = 0; // make change immediate
-    pub const DRAIN = 1; // drain output, then chage
-    pub const FLUSH = 2; // drain output, flush input
-    pub const SOFT = 0x10; // flag - don't alter h.w. state
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
 };
 
 pub const TCIFLUSH = 1;

lib/std/c/openbsd.zig

@@ -768,12 +768,11 @@ pub const AUTH = struct {
     pub const ALLOW: c_int = (OKAY | ROOTOKAY | SECURE);
 };
 
-// Commands passed to tcsetattr() for setting the termios structure.
-pub const TCSA = struct {
-    pub const NOW = 0; // make change immediate
-    pub const DRAIN = 1; // drain output, then change
-    pub const FLUSH = 2; // drain output, flush input
-    pub const SOFT = 0x10; // flag - don't alter h.w. state
+pub const TCSA = enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
 };
 
 pub const TCIFLUSH = 1;