[libc] Add termios.h and the implementation of functions declared in it.

Reviewed By: lntue, michaelrj

Differential Revision: https://reviews.llvm.org/D136143

11 files changed, 305 insertions, 0 deletions

diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 1e401a0a5efd..8f7a505186e6 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -350,6 +350,19 @@ add_gen_header(
     .llvm-libc-types.struct_rusage
 )
 
+add_gen_header(
+  termios
+  DEF_FILE termios.h.def
+  GEN_HDR termios.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-macros.termios_macros
+    .llvm-libc-types.cc_t
+    .llvm-libc-types.speed_t
+    .llvm-libc-types.struct_termios
+    .llvm-libc-types.tcflag_t
+)
+
 if(NOT LLVM_LIBC_FULL_BUILD)
   # We don't install headers in non-fullbuild mode.
   return()
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index 8e8dbae0d852..84453664325c 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -100,6 +100,14 @@ add_header(
 )
 
 add_header(
+  termios_macros
+  HDR
+    termios-macros.h
+  DEPENDS
+    .linux.termios_macros
+)
+
+add_header(
   time_macros
   HDR
     time-macros.h
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
index 52b826837027..a1f1fed292ed 100644
--- a/libc/include/llvm-libc-macros/linux/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
@@ -69,3 +69,9 @@ add_header(
   HDR
     signal-macros.h
 )
+
+add_header(
+  termios_macros
+  HDR
+    termios-macros.h
+)
diff --git a/libc/include/llvm-libc-macros/linux/termios-macros.h b/libc/include/llvm-libc-macros/linux/termios-macros.h
new file mode 100644
index 000000000000..17e380ebecff
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/termios-macros.h
@@ -0,0 +1,167 @@
+//===-- Definition of macros from termios.h -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_LINUX_TERMIOS_MACROS_H
+#define __LLVM_LIBC_MACROS_LINUX_TERMIOS_MACROS_H
+
+// Below are generic definitions of symbolic bit-masks, modes etc. They serve
+// most architectures including x86_64, aarch64 but have to be adjusted for few
+// architectures MIPS.
+
+#define NCCS 32
+
+// Bit-masks for the c_iflag field of struct termios.
+#define IGNBRK 0000001  // Ignore break condition
+#define BRKINT 0000002  // Signal interrupt on break
+#define IGNPAR 0000004  // Ignore characters with parity errors
+#define PARMRK 0000010  // Mark parity and framing errors
+#define INPCK 0000020   // Enable input parity check
+#define ISTRIP 0000040  // Strip 8th bit off characters
+#define INLCR 0000100   // Map NL to CR on input
+#define IGNCR 0000200   // Ignore CR
+#define ICRNL 0000400   // Map CR to NL on input
+#define IUCLC 0001000   // Map uppercase characters to lowercase on input
+#define IXON 0002000    // Enable start/stop output control
+#define IXANY 0004000   // Enable any character to restart output
+#define IXOFF 0010000   // Enable start/stop input control
+#define IMAXBEL 0020000 // Ring bell when input queue is full
+#define IUTF8 0040000   // Input is UTF8 (not in POSIX)
+
+// Bit-masks for the c_oflag field of struct termios.
+#define OPOST 0000001  // Post-process output
+#define OLCUC 0000002  // Map lowercase characters to uppercase on output
+#define ONLCR 0000004  // Map NL to CR-NL on output
+#define OCRNL 0000010  // Map CR to NL on output
+#define ONOCR 0000020  // No CR output at column 0
+#define ONLRET 0000040 // NL performs CR function
+#define OFILL 0000100  // Use fill characters for delay
+#define OFDEL 0000200  // Fill is DEL
+#define NLDLY 0000400  // Select newline delays
+#define NL0 0000000    // Newline type 0
+#define NL1 0000400    // Newline type 1
+#define CRDLY 0003000  // Select carriage-return delays
+#define CR0 0000000    // Carriage-return delay type 0
+#define CR1 0001000    // Carriage-return delay type 1
+#define CR2 0002000    // Carriage-return delay type 2
+#define CR3 0003000    // Carriage-return delay type 3
+#define TABDLY 0014000 // Select horizontal-tab delays
+#define TAB0 0000000   // Horizontal-tab delay type 0
+#define TAB1 0004000   // Horizontal-tab delay type 1
+#define TAB2 0010000   // Horizontal-tab delay type 2
+#define TAB3 0014000   // Expand tabs to spaces
+#define BSDLY 0020000  // Select backspace delays
+#define BS0 0000000    // Backspace-delay type 0
+#define BS1 0020000    // Backspace-delay type 1
+#define FFDLY 0100000  // Select form-feed delays
+#define FF0 0000000    // Form-feed delay type 0
+#define FF1 0100000    // Form-feed delay type 1
+#define VTDLY 0040000  // Select vertical-tab delays
+#define VT0 0000000    // Vertical-tab delay type 0
+#define VT1 0040000    // Vertical-tab delay type 1
+#define XTABS 0014000
+
+// Symbolic subscripts for the c_cc array.
+#define VINTR 0
+#define VQUIT 1
+#define VERASE 2
+#define VKILL 3
+#define VEOF 4
+#define VTIME 5
+#define VMIN 6
+#define VSWTC 7
+#define VSTART 8
+#define VSTOP 9
+#define VSUSP 10
+#define VEOL 11
+#define VREPRINT 12
+#define VDISCARD 13
+#define VWERASE 14
+#define VLNEXT 15
+#define VEOL2 16
+
+// Baud rate related definitions
+#define CBAUD 000000010017  // Baud speed mask
+#define CBAUDX 000000010000 // Extra baud speed mask
+#define CIBAUD 002003600000
+#define CMSPAR 010000000000
+#define CRTSCTS 020000000000
+// Baud rates with values representable by the speed_t type.
+#define B0 0000000 // Implies hang-up
+// A symbol B<NN+> below indicates a baud rate of <NN+>.
+#define B50 0000001
+#define B75 0000002
+#define B110 0000003
+#define B134 0000004
+#define B150 0000005
+#define B200 0000006
+#define B300 0000007
+#define B600 0000010
+#define B1200 0000011
+#define B1800 0000012
+#define B2400 0000013
+#define B4800 0000014
+#define B9600 0000015
+#define B19200 0000016
+#define B38400 0000017
+// Extra baud rates
+#define B57600 0010001
+#define B115200 0010002
+#define B230400 0010003
+#define B460800 0010004
+#define B500000 0010005
+#define B576000 0010006
+#define B921600 0010007
+#define B1000000 0010010
+#define B1152000 0010011
+#define B1500000 0010012
+#define B2000000 0010013
+#define B2500000 0010014
+#define B3000000 0010015
+#define B3500000 0010016
+#define B4000000 0010017
+
+// Control mode bits for use in the c_cflag field of struct termios.
+#define CSIZE 0000060 // Mask for character size bits
+#define CS5 0000000
+#define CS6 0000020
+#define CS7 0000040
+#define CS8 0000060
+#define CSTOPB 0000100 // Send two bits, else one
+#define CREAD 0000200  // Enable receiver
+#define PARENB 0000400 // Parity enable
+#define PARODD 0001000 // Odd parity, else even
+#define HUPCL 0002000  // Hang up on last close
+#define CLOCAL 0004000 // Ignore modem status lines
+
+// Local mode bits for use in the c_lflag field of struct termios.
+#define ISIG 0000001   // Enable signals
+#define ICANON 0000002 // Canonical input (erase and kill processing)
+#define ECHO 0000010   // Enable echo
+#define ECHOE 0000020  // Echo erase character as error-correcting backspace
+#define ECHOK 0000040  // Echo KILL
+#define ECHONL 0000100 // Echo NL
+#define NOFLSH 0000200 // Disable flush after interrupt or quit
+#define TOSTOP 0000400 // Send SIGTTOU for background output
+
+// Attribute selection
+#define TCSANOW 0   // Change attributes immediately
+#define TCSADRAIN 1 // Change attributes when output has drained
+#define TCSAFLUSH 2 // Same as TCSADRAIN and flush pending Output
+
+// Symbolic constants for use with tcflush function.
+#define TCIFLUSH 0  // Flush pending input
+#define TCIOFLUSH 1 // Flush pending input and unstransmitted output
+#define TCOFLUSH 2  // Flush unstransmitted output
+
+// Symbolic constantf for use with tcflow function.
+#define TCOOFF 0 // Transmit a STOP character, intended to suspend input data
+#define TCOON 1  // Transmit a START character, intended to restart input data
+#define TCIOFF 2 // Suspend output
+#define TCION 3  // Restart output
+
+#endif // __LLVM_LIBC_MACROS_LINUX_TERMIOS_MACROS_H
diff --git a/libc/include/llvm-libc-macros/termios-macros.h b/libc/include/llvm-libc-macros/termios-macros.h
new file mode 100644
index 000000000000..c99982837a57
--- /dev/null
+++ b/libc/include/llvm-libc-macros/termios-macros.h
@@ -0,0 +1,16 @@
+//===-- Macros defined in termios.h header file ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_MACROS_TERMIOS_MACROS_H
+#define __LLVM_LIBC_MACROS_TERMIOS_MACROS_H
+
+#ifdef __linux__
+#include "linux/termios-macros.h"
+#endif
+
+#endif // __LLVM_LIBC_MACROS_TERMIOS_MACROS_H
diff --git a/libc/include/llvm-libc-types/CMakeLists.txt b/libc/include/llvm-libc-types/CMakeLists.txt
index 225f2fda8c52..2e8bded262f1 100644
--- a/libc/include/llvm-libc-types/CMakeLists.txt
+++ b/libc/include/llvm-libc-types/CMakeLists.txt
@@ -15,6 +15,7 @@ add_header(__sighandler_t HDR __sighandler_t.h)
 add_header(__thread_type HDR __thread_type.h)
 add_header(blkcnt_t HDR blkcnt_t.h)
 add_header(blksize_t HDR blksize_t.h)
+add_header(cc_t HDR cc_t.h)
 add_header(clockid_t HDR clockid_t.h)
 add_header(cnd_t HDR cnd_t.h)
 add_header(cookie_io_functions_t HDR cookie_io_functions_t.h DEPENDS .off64_t)
@@ -74,3 +75,6 @@ add_header(thrd_t HDR thrd_t.h DEPENDS .__thread_type)
 add_header(tss_t HDR tss_t.h)
 add_header(tss_dtor_t HDR tss_dtor_t.h)
 add_header(__atexithandler_t HDR __atexithandler_t.h)
+add_header(speed_t HDR speed_t.h)
+add_header(tcflag_t HDR tcflag_t.h)
+add_header(struct_termios HDR struct_termios.h DEPENDS .cc_t .speed_t .tcflag_t)
diff --git a/libc/include/llvm-libc-types/cc_t.h b/libc/include/llvm-libc-types/cc_t.h
new file mode 100644
index 000000000000..e08523cc3ec9
--- /dev/null
+++ b/libc/include/llvm-libc-types/cc_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of cc_t type -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_CC_T_H__
+#define __LLVM_LIBC_TYPES_CC_T_H__
+
+typedef unsigned char cc_t;
+
+#endif // __LLVM_LIBC_TYPES_CC_T_H__
diff --git a/libc/include/llvm-libc-types/speed_t.h b/libc/include/llvm-libc-types/speed_t.h
new file mode 100644
index 000000000000..b4ec13df27b5
--- /dev/null
+++ b/libc/include/llvm-libc-types/speed_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of speed_t type ----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_SPEED_T_H__
+#define __LLVM_LIBC_TYPES_SPEED_T_H__
+
+typedef unsigned int speed_t;
+
+#endif // __LLVM_LIBC_TYPES_SPEED_T_H__
diff --git a/libc/include/llvm-libc-types/struct_termios.h b/libc/include/llvm-libc-types/struct_termios.h
new file mode 100644
index 000000000000..72aefe4f6926
--- /dev/null
+++ b/libc/include/llvm-libc-types/struct_termios.h
@@ -0,0 +1,32 @@
+//===-- Definition of struct termios --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_STRUCT_TERMIOS_H__
+#define __LLVM_LIBC_TYPES_STRUCT_TERMIOS_H__
+
+#include <llvm-libc-types/cc_t.h>
+#include <llvm-libc-types/speed_t.h>
+#include <llvm-libc-types/tcflag_t.h>
+
+struct termios {
+  tcflag_t c_iflag; // Input mode flags
+  tcflag_t c_oflag; // Output mode flags
+  tcflag_t c_cflag; // Control mode flags
+  tcflag_t c_lflag; // Local mode flags
+#ifdef __linux__
+  cc_t c_line; // Line discipline
+#endif         // __linux__
+  // NCCS is defined in llvm-libc-macros/termios-macros.h.
+  cc_t c_cc[NCCS]; // Control characters
+#ifdef __linux__
+  speed_t c_ispeed; // Input speed
+  speed_t c_ospeed; // output speed
+#endif              // __linux__
+};
+
+#endif // __LLVM_LIBC_TYPES_STRUCT_TERMIOS_H__
diff --git a/libc/include/llvm-libc-types/tcflag_t.h b/libc/include/llvm-libc-types/tcflag_t.h
new file mode 100644
index 000000000000..7c2ce2154208
--- /dev/null
+++ b/libc/include/llvm-libc-types/tcflag_t.h
@@ -0,0 +1,14 @@
+//===-- Definition of tcflag_t type ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __LLVM_LIBC_TYPES_TCFLAG_T_H__
+#define __LLVM_LIBC_TYPES_TCFLAG_T_H__
+
+typedef unsigned int tcflag_t;
+
+#endif // __LLVM_LIBC_TYPES_TCFLAG_T_H__
diff --git a/libc/include/termios.h.def b/libc/include/termios.h.def
new file mode 100644
index 000000000000..be1cd2bff526
--- /dev/null
+++ b/libc/include/termios.h.def
@@ -0,0 +1,17 @@
+//===-- C standard library header termios.h -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TERMIOS_H
+#define LLVM_LIBC_TERMIOS_H
+
+#include <__llvm-libc-common.h>
+#include <llvm-libc-macros/termios-macros.h>
+
+%%public_api()
+
+#endif // LLVM_LIBC_TERMIOS_H