diff --git a/lib/std/os/bits/darwin.zig b/lib/std/os/bits/darwin.zig
index 8bd40ed9a3..b9fe23eeb1 100644
--- a/lib/std/os/bits/darwin.zig
+++ b/lib/std/os/bits/darwin.zig
@@ -1554,3 +1554,186 @@ pub const rlimit = extern struct {
 pub const SHUT_RD = 0;
 pub const SHUT_WR = 1;
 pub const SHUT_RDWR = 2;
+
+// Term
+pub const VEOF = 0;
+pub const VEOL = 1;
+pub const VEOL2 = 2;
+pub const VERASE = 3;
+pub const VWERASE = 4;
+pub const VKILL = 5;
+pub const VREPRINT = 6;
+pub const VINTR = 8;
+pub const VQUIT = 9;
+pub const VSUSP = 10;
+pub const VDSUSP = 11;
+pub const VSTART = 12;
+pub const VSTOP = 13;
+pub const VLNEXT = 14;
+pub const VDISCARD = 15;
+pub const VMIN = 16;
+pub const VTIME = 17;
+pub const VSTATUS = 18;
+pub const NCCS = 20; // 2 spares (7, 19)
+
+pub const IGNBRK = 0x00000001; // ignore BREAK condition
+pub const BRKINT = 0x00000002; // map BREAK to SIGINTR
+pub const IGNPAR = 0x00000004; // ignore (discard) parity errors
+pub const PARMRK = 0x00000008; // mark parity and framing errors
+pub const INPCK = 0x00000010; // enable checking of parity errors
+pub const ISTRIP = 0x00000020; // strip 8th bit off chars
+pub const INLCR = 0x00000040; // map NL into CR
+pub const IGNCR = 0x00000080; // ignore CR
+pub const ICRNL = 0x00000100; // map CR to NL (ala CRMOD)
+pub const IXON = 0x00000200; // enable output flow control
+pub const IXOFF = 0x00000400; // enable input flow control
+pub const IXANY = 0x00000800; // any char will restart after stop
+pub const IMAXBEL = 0x00002000; // ring bell on input queue full
+pub const IUTF8 = 0x00004000; // maintain state for UTF-8 VERASE
+
+pub const OPOST = 0x00000001; //enable following output processing
+pub const ONLCR = 0x00000002; // map NL to CR-NL (ala CRMOD)
+pub const OXTABS = 0x00000004; // expand tabs to spaces
+pub const ONOEOT = 0x00000008; // discard EOT's (^D) on output)
+
+pub const OCRNL = 0x00000010; // map CR to NL on output
+pub const ONOCR = 0x00000020; // no CR output at column 0
+pub const ONLRET = 0x00000040; // NL performs CR function
+pub const OFILL = 0x00000080; // use fill characters for delay
+pub const NLDLY = 0x00000300; // \n delay
+pub const TABDLY = 0x00000c04; // horizontal tab delay
+pub const CRDLY = 0x00003000; // \r delay
+pub const FFDLY = 0x00004000; // form feed delay
+pub const BSDLY = 0x00008000; // \b delay
+pub const VTDLY = 0x00010000; // vertical tab delay
+pub const OFDEL = 0x00020000; // fill is DEL, else NUL
+
+pub const NL0 = 0x00000000;
+pub const NL1 = 0x00000100;
+pub const NL2 = 0x00000200;
+pub const NL3 = 0x00000300;
+pub const TAB0 = 0x00000000;
+pub const TAB1 = 0x00000400;
+pub const TAB2 = 0x00000800;
+pub const TAB3 = 0x00000004;
+pub const CR0 = 0x00000000;
+pub const CR1 = 0x00001000;
+pub const CR2 = 0x00002000;
+pub const CR3 = 0x00003000;
+pub const FF0 = 0x00000000;
+pub const FF1 = 0x00004000;
+pub const BS0 = 0x00000000;
+pub const BS1 = 0x00008000;
+pub const VT0 = 0x00000000;
+pub const VT1 = 0x00010000;
+
+pub const CIGNORE = 0x00000001; // ignore control flags
+pub const CSIZE = 0x00000300; // character size mask
+pub const CS5 = 0x00000000; //    5 bits (pseudo)
+pub const CS6 = 0x00000100; //    6 bits
+pub const CS7 = 0x00000200; //    7 bits
+pub const CS8 = 0x00000300; //    8 bits
+pub const CSTOPB = 0x0000040; // send 2 stop bits
+pub const CREAD = 0x00000800; // enable receiver
+pub const PARENB = 0x00001000; // parity enable
+pub const PARODD = 0x00002000; // odd parity, else even
+pub const HUPCL = 0x00004000; // hang up on last close
+pub const CLOCAL = 0x00008000; // ignore modem status lines
+pub const CCTS_OFLOW = 0x00010000; // CTS flow control of output
+pub const CRTSCTS = (CCTS_OFLOW | CRTS_IFLOW);
+pub const CRTS_IFLOW = 0x00020000; // RTS flow control of input
+pub const CDTR_IFLOW = 0x00040000; // DTR flow control of input
+pub const CDSR_OFLOW = 0x00080000; // DSR flow control of output
+pub const CCAR_OFLOW = 0x00100000; // DCD flow control of output
+pub const MDMBUF = 0x00100000; // old name for CCAR_OFLOW
+
+pub const ECHOKE = 0x00000001; // visual erase for line kill
+pub const ECHOE = 0x00000002; // visually erase chars
+pub const ECHOK = 0x00000004; // echo NL after line kill
+pub const ECHO = 0x00000008; // enable echoing
+pub const ECHONL = 0x00000010; // echo NL even if ECHO is off
+pub const ECHOPRT = 0x00000020; // visual erase mode for hardcopy
+pub const ECHOCTL = 0x00000040; // echo control chars as ^(Char)
+pub const ISIG = 0x00000080; // enable signals INTR, QUIT, [D]SUSP
+pub const ICANON = 0x00000100; // canonicalize input lines
+pub const ALTWERASE = 0x00000200; // use alternate WERASE algorithm
+pub const IEXTEN = 0x00000400; // enable DISCARD and LNEXT
+pub const EXTPROC = 0x00000800; // external processing
+pub const TOSTOP = 0x00400000; // stop background jobs from output
+pub const FLUSHO = 0x00800000; // output being flushed (state)
+pub const NOKERNINFO = 0x02000000; // no kernel output from VSTATUS
+pub const PENDIN = 0x20000000; // XXX retype pending input (state)
+pub const NOFLSH = 0x80000000; // don't flush after interrupt
+
+pub const TCSANOW = 0; // make change immediate
+pub const TCSADRAIN = 1; // drain output, then change
+pub const TCSAFLUSH = 2; // drain output, flush input
+pub const TCSASOFT = 0x10; // flag - don't alter h.w. state
+pub const TCSA = extern enum(c_uint) {
+    NOW,
+    DRAIN,
+    FLUSH,
+    _,
+};
+
+pub const B0 = 0;
+pub const B50 = 50;
+pub const B75 = 75;
+pub const B110 = 110;
+pub const B134 = 134;
+pub const B150 = 150;
+pub const B200 = 200;
+pub const B300 = 300;
+pub const B600 = 600;
+pub const B1200 = 1200;
+pub const B1800 = 1800;
+pub const B2400 = 2400;
+pub const B4800 = 4800;
+pub const B9600 = 9600;
+pub const B19200 = 19200;
+pub const B38400 = 38400;
+pub const B7200 = 7200;
+pub const B14400 = 14400;
+pub const B28800 = 28800;
+pub const B57600 = 57600;
+pub const B76800 = 76800;
+pub const B115200 = 115200;
+pub const B230400 = 230400;
+pub const EXTA = 19200;
+pub const EXTB = 38400;
+
+pub const TCIFLUSH = 1;
+pub const TCOFLUSH = 2;
+pub const TCIOFLUSH = 3;
+pub const TCOOFF = 1;
+pub const TCOON = 2;
+pub const TCIOFF = 3;
+pub const TCION = 4;
+
+pub const cc_t = u8;
+pub const speed_t = u64;
+pub const tcflag_t = u64;
+
+pub const termios = extern struct {
+    iflag: tcflag_t, // input flags
+    oflag: tcflag_t, // output flags
+    cflag: tcflag_t, // control flags
+    lflag: tcflag_t, // local flags
+    cc: [NCCS]cc_t, // control chars
+    ispeed: speed_t align(8), // input speed
+    ospeed: speed_t, // output speed
+};
+
+pub const winsize = extern struct {
+    ws_row: u16,
+    ws_col: u16,
+    ws_xpixel: u16,
+    ws_ypixel: u16,
+};
+
+pub const TIOCGWINSZ = ior(0x40000000, 't', 104, @sizeOf(winsize));
+pub const IOCPARM_MASK = 0x1fff;
+
+fn ior(inout: u32, group: usize, num: usize, len: usize) usize {
+    return (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num));
+}