diff --git a/libc/bionic/termios.cpp b/libc/bionic/termios.cpp
new file mode 100644
index 0000000..082dcdc
--- /dev/null
+++ b/libc/bionic/termios.cpp
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <termios.h>
+#include <unistd.h>
+
+static speed_t cfgetspeed(const termios* s) {
+  return (s->c_cflag & CBAUD);
+}
+
+speed_t cfgetispeed(const termios* s) {
+  return cfgetspeed(s);
+}
+
+speed_t cfgetospeed(const termios* s) {
+  return cfgetspeed(s);
+}
+
+void cfmakeraw(termios* s) {
+  s->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
+  s->c_oflag &= ~OPOST;
+  s->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
+  s->c_cflag &= ~(CSIZE|PARENB);
+  s->c_cflag |= CS8;
+}
+
+int cfsetispeed(termios* s, speed_t speed) {
+  return cfsetspeed(s, speed);
+}
+
+int cfsetospeed(termios* s, speed_t speed) {
+  return cfsetspeed(s, speed);
+}
+
+int cfsetspeed(termios* s, speed_t speed) {
+  // TODO: check 'speed' is valid.
+  s->c_cflag = (s->c_cflag & ~CBAUD) | (speed & CBAUD);
+  return 0;
+}
+
+int tcdrain(int fd) {
+  // A non-zero argument to TCSBRK means "don't send a break".
+  // The drain is a side-effect of the ioctl!
+  return ioctl(fd, TCSBRK, static_cast<unsigned long>(1));
+}
+
+int tcflow(int fd, int action) {
+  return ioctl(fd, TCXONC, static_cast<unsigned long>(action));
+}
+
+int tcflush(int fd, int queue) {
+  return ioctl(fd, TCFLSH, static_cast<unsigned long>(queue));
+}
+
+int tcgetattr(int fd, termios* s) {
+  return ioctl(fd, TCGETS, s);
+}
+
+pid_t tcgetsid(int fd) {
+  pid_t sid;
+  if (ioctl(fd, TIOCGSID, &sid) == -1) {
+    return -1;
+  }
+  return sid;
+}
+
+int tcsendbreak(int fd, int duration) {
+  return ioctl(fd, TCSBRKP, static_cast<unsigned long>(duration));
+}
+
+int tcsetattr(int fd, int optional_actions, const termios* s) {
+  int cmd;
+  switch (optional_actions) {
+    case TCSANOW: cmd = TCSETS; break;
+    case TCSADRAIN: cmd = TCSETSW; break;
+    case TCSAFLUSH: cmd = TCSETSF; break;
+    default: errno = EINVAL; return -1;
+  }
+  return ioctl(fd, cmd, s);
+}
+
+pid_t tcgetpgrp(int fd) {
+  pid_t pid;
+  if (ioctl(fd, TIOCGPGRP, &pid) == -1) {
+    return -1;
+  }
+  return pid;
+}
+
+int tcsetpgrp(int fd, pid_t pid) {
+  return ioctl(fd, TIOCSPGRP, &pid);
+}