[libc-commits] [libc] b2a294b - [libc] Add termios.h and the implementation of functions declared in it.
Siva Chandra Reddy via libc-commits
libc-commits at lists.llvm.org
Tue Oct 18 13:53:08 PDT 2022
Author: Siva Chandra Reddy
Date: 2022-10-18T20:53:00Z
New Revision: b2a294bcf8e6fd83efe72d6d7432affd65b2309e
URL: https://github.com/llvm/llvm-project/commit/b2a294bcf8e6fd83efe72d6d7432affd65b2309e
DIFF: https://github.com/llvm/llvm-project/commit/b2a294bcf8e6fd83efe72d6d7432affd65b2309e.diff
LOG: [libc] Add termios.h and the implementation of functions declared in it.
Reviewed By: lntue, michaelrj
Differential Revision: https://reviews.llvm.org/D136143
Added:
libc/include/llvm-libc-macros/linux/termios-macros.h
libc/include/llvm-libc-macros/termios-macros.h
libc/include/llvm-libc-types/cc_t.h
libc/include/llvm-libc-types/speed_t.h
libc/include/llvm-libc-types/struct_termios.h
libc/include/llvm-libc-types/tcflag_t.h
libc/include/termios.h.def
libc/src/termios/CMakeLists.txt
libc/src/termios/cfgetispeed.h
libc/src/termios/cfgetospeed.h
libc/src/termios/cfsetispeed.h
libc/src/termios/cfsetospeed.h
libc/src/termios/linux/CMakeLists.txt
libc/src/termios/linux/cfgetispeed.cpp
libc/src/termios/linux/cfgetospeed.cpp
libc/src/termios/linux/cfsetispeed.cpp
libc/src/termios/linux/cfsetospeed.cpp
libc/src/termios/linux/kernel_termios.h
libc/src/termios/linux/tcdrain.cpp
libc/src/termios/linux/tcflow.cpp
libc/src/termios/linux/tcflush.cpp
libc/src/termios/linux/tcgetattr.cpp
libc/src/termios/linux/tcgetsid.cpp
libc/src/termios/linux/tcsendbreak.cpp
libc/src/termios/linux/tcsetattr.cpp
libc/src/termios/tcdrain.h
libc/src/termios/tcflow.h
libc/src/termios/tcflush.h
libc/src/termios/tcgetattr.h
libc/src/termios/tcgetsid.h
libc/src/termios/tcsendbreak.h
libc/src/termios/tcsetattr.h
libc/test/src/termios/CMakeLists.txt
libc/test/src/termios/termios_test.cpp
Modified:
libc/config/linux/api.td
libc/config/linux/x86_64/entrypoints.txt
libc/include/CMakeLists.txt
libc/include/llvm-libc-macros/CMakeLists.txt
libc/include/llvm-libc-macros/linux/CMakeLists.txt
libc/include/llvm-libc-types/CMakeLists.txt
libc/spec/posix.td
libc/src/CMakeLists.txt
libc/test/src/CMakeLists.txt
Removed:
################################################################################
diff --git a/libc/config/linux/api.td b/libc/config/linux/api.td
index 1aa1b3ff2cedd..9423827b55826 100644
--- a/libc/config/linux/api.td
+++ b/libc/config/linux/api.td
@@ -293,3 +293,7 @@ def SysUtsNameAPI : PublicAPI<"sys/utsname.h"> {
def SpawnAPI : PublicAPI<"spawn.h"> {
let Types = ["mode_t", "pid_t", "posix_spawnattr_t", "posix_spawn_file_actions_t"];
}
+
+def TermiosAPI : PublicAPI<"termios.h"> {
+ let Types = ["cc_t", "pid_t", "speed_t", "struct termios", "tcflag_t"];
+}
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index e41a897587c45..6afd1bf4f6925 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -141,6 +141,19 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.wait.wait4
libc.src.sys.wait.waitpid
+ # termios.h entrypoints
+ libc.src.termios.cfgetispeed
+ libc.src.termios.cfgetospeed
+ libc.src.termios.cfsetispeed
+ libc.src.termios.cfsetospeed
+ libc.src.termios.tcgetattr
+ libc.src.termios.tcgetsid
+ libc.src.termios.tcdrain
+ libc.src.termios.tcflow
+ libc.src.termios.tcflush
+ libc.src.termios.tcsendbreak
+ libc.src.termios.tcsetattr
+
# unistd.h entrypoints
libc.src.unistd.access
libc.src.unistd.chdir
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 1e401a0a5efd3..8f7a505186e6b 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 8e8dbae0d8524..84453664325c3 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -99,6 +99,14 @@ add_header(
.linux.sys_wait_macros
)
+add_header(
+ termios_macros
+ HDR
+ termios-macros.h
+ DEPENDS
+ .linux.termios_macros
+)
+
add_header(
time_macros
HDR
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
index 52b826837027d..a1f1fed292eda 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 0000000000000..17e380ebecffe
--- /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 0000000000000..c99982837a57a
--- /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 225f2fda8c52b..2e8bded262f1f 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 0000000000000..e08523cc3ec9e
--- /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 0000000000000..b4ec13df27b55
--- /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 0000000000000..72aefe4f69267
--- /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 0000000000000..7c2ce21542086
--- /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 0000000000000..be1cd2bff526c
--- /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
diff --git a/libc/spec/posix.td b/libc/spec/posix.td
index 29f8ed9801db0..2f27eb2b3cc44 100644
--- a/libc/spec/posix.td
+++ b/libc/spec/posix.td
@@ -58,6 +58,13 @@ def PosixSpawnFileActionsTRestrictedPtr : RestrictedPtrType<PosixSpawnFileAction
def PosixSpawnAttrT : NamedType<"posix_spawnattr_t">;
def RestrictedPosixSpawnAttrTPtrType : RestrictedPtrType<PosixSpawnAttrT>;
+def CcT : NamedType<"cc_t">;
+def SpeedT : NamedType<"speed_t">;
+def StructTermios : NamedType<"struct termios">;
+def StructTermiosPtr : PtrType<StructTermios>;
+def ConstStructTermiosPtr : ConstType<StructTermiosPtr>;
+def TcFlagT : NamedType<"tcflag_t">;
+
def POSIX : StandardSpec<"POSIX"> {
PtrType CharPtr = PtrType<CharType>;
RestrictedPtrType RestrictedCharPtr = RestrictedPtrType<CharType>;
@@ -1100,6 +1107,72 @@ def POSIX : StandardSpec<"POSIX"> {
]
>;
+ HeaderSpec Termios = HeaderSpec<
+ "termios.h",
+ [
+ Macro<"NCCS">,
+ ],
+ [CcT, PidT, SpeedT, StructTermios, TcFlagT], // Types
+ [], // Enumerations
+ [
+ FunctionSpec<
+ "cfgetispeed",
+ RetValSpec<SpeedT>,
+ [ArgSpec<ConstStructTermiosPtr>]
+ >,
+ FunctionSpec<
+ "cfgetospeed",
+ RetValSpec<SpeedT>,
+ [ArgSpec<ConstStructTermiosPtr>]
+ >,
+ FunctionSpec<
+ "cfsetispeed",
+ RetValSpec<SpeedT>,
+ [ArgSpec<StructTermiosPtr>, ArgSpec<SpeedT>]
+ >,
+ FunctionSpec<
+ "cfsetospeed",
+ RetValSpec<SpeedT>,
+ [ArgSpec<StructTermiosPtr>, ArgSpec<SpeedT>]
+ >,
+ FunctionSpec<
+ "tcdrain",
+ RetValSpec<IntType>,
+ [ArgSpec<IntType>]
+ >,
+ FunctionSpec<
+ "tcflow",
+ RetValSpec<IntType>,
+ [ArgSpec<IntType>, ArgSpec<IntType>]
+ >,
+ FunctionSpec<
+ "tcflush",
+ RetValSpec<IntType>,
+ [ArgSpec<IntType>, ArgSpec<IntType>]
+ >,
+ FunctionSpec<
+ "tcgetattr",
+ RetValSpec<IntType>,
+ [ArgSpec<IntType>, ArgSpec<StructTermiosPtr>]
+ >,
+ FunctionSpec<
+ "tcgetsid",
+ RetValSpec<PidT>,
+ [ArgSpec<IntType>]
+ >,
+ FunctionSpec<
+ "tcsendbreak",
+ RetValSpec<IntType>,
+ [ArgSpec<IntType>, ArgSpec<IntType>]
+ >,
+ FunctionSpec<
+ "tcsetattr",
+ RetValSpec<IntType>,
+ [ArgSpec<IntType>, ArgSpec<IntType>, ArgSpec<StructTermiosPtr>]
+ >,
+ ]
+ >;
+
let Headers = [
CType,
Dirent,
@@ -1117,6 +1190,7 @@ def POSIX : StandardSpec<"POSIX"> {
SysUtsName,
SysWait,
Time,
+ Termios,
UniStd,
String
];
diff --git a/libc/src/CMakeLists.txt b/libc/src/CMakeLists.txt
index 3d594af393794..63a7258064dcc 100644
--- a/libc/src/CMakeLists.txt
+++ b/libc/src/CMakeLists.txt
@@ -15,6 +15,7 @@ if(${LIBC_TARGET_OS} STREQUAL "linux")
add_subdirectory(pthread)
add_subdirectory(sched)
add_subdirectory(sys)
+ add_subdirectory(termios)
add_subdirectory(unistd)
endif()
diff --git a/libc/src/termios/CMakeLists.txt b/libc/src/termios/CMakeLists.txt
new file mode 100644
index 0000000000000..b5d7b676ac0da
--- /dev/null
+++ b/libc/src/termios/CMakeLists.txt
@@ -0,0 +1,80 @@
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+ add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+endif()
+
+add_entrypoint_object(
+ cfgetispeed
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.cfgetispeed
+)
+
+add_entrypoint_object(
+ cfsetispeed
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.cfsetispeed
+)
+
+add_entrypoint_object(
+ cfgetospeed
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.cfgetospeed
+)
+
+add_entrypoint_object(
+ cfsetospeed
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.cfsetospeed
+)
+
+add_entrypoint_object(
+ tcgetsid
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcgetsid
+)
+
+add_entrypoint_object(
+ tcdrain
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcdrain
+)
+
+add_entrypoint_object(
+ tcflow
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcflow
+)
+
+add_entrypoint_object(
+ tcflush
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcflush
+)
+
+add_entrypoint_object(
+ tcsendbreak
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcsendbreak
+)
+
+add_entrypoint_object(
+ tcgetattr
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcgetattr
+)
+
+add_entrypoint_object(
+ tcsetattr
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcsetattr
+)
diff --git a/libc/src/termios/cfgetispeed.h b/libc/src/termios/cfgetispeed.h
new file mode 100644
index 0000000000000..8ed6dac6cd51d
--- /dev/null
+++ b/libc/src/termios/cfgetispeed.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for cfgetispeed -------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_CFGETISPEED_H
+#define LLVM_LIBC_SRC_UNISTD_CFGETISPEED_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+speed_t cfgetispeed(const struct termios *t);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_CFGETISPEED_H
diff --git a/libc/src/termios/cfgetospeed.h b/libc/src/termios/cfgetospeed.h
new file mode 100644
index 0000000000000..aafebd984c728
--- /dev/null
+++ b/libc/src/termios/cfgetospeed.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for cfgetospeed -------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_CFGETOSPEED_H
+#define LLVM_LIBC_SRC_UNISTD_CFGETOSPEED_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+speed_t cfgetospeed(const struct termios *t);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_CFGETOSPEED_H
diff --git a/libc/src/termios/cfsetispeed.h b/libc/src/termios/cfsetispeed.h
new file mode 100644
index 0000000000000..7204887b16248
--- /dev/null
+++ b/libc/src/termios/cfsetispeed.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for cfsetispeed -------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_CFSETISPEED_H
+#define LLVM_LIBC_SRC_UNISTD_CFSETISPEED_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int cfsetispeed(struct termios *t, speed_t speed);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_CFSETISPEED_H
diff --git a/libc/src/termios/cfsetospeed.h b/libc/src/termios/cfsetospeed.h
new file mode 100644
index 0000000000000..e831bab2b949d
--- /dev/null
+++ b/libc/src/termios/cfsetospeed.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for cfsetospeed -------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_CFSETOSPEED_H
+#define LLVM_LIBC_SRC_UNISTD_CFSETOSPEED_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int cfsetospeed(struct termios *t, speed_t speed);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_CFSETOSPEED_H
diff --git a/libc/src/termios/linux/CMakeLists.txt b/libc/src/termios/linux/CMakeLists.txt
new file mode 100644
index 0000000000000..e990fba25eabe
--- /dev/null
+++ b/libc/src/termios/linux/CMakeLists.txt
@@ -0,0 +1,144 @@
+# There is no
diff erence between input and output speeds on Linux.
+# However, since POSIX requires separate functions for setting and getting
+# of the input and output speeds, we use
diff erent entrypoints wiht the
+# same getter/setter logic.
+add_entrypoint_object(
+ cfgetispeed
+ SRCS
+ cfgetispeed.cpp
+ HDRS
+ ../cfgetispeed.h
+ DEPENDS
+ libc.include.termios
+)
+
+add_entrypoint_object(
+ cfsetispeed
+ SRCS
+ cfsetispeed.cpp
+ HDRS
+ ../cfsetispeed.h
+ DEPENDS
+ libc.include.termios
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ cfgetospeed
+ SRCS
+ cfgetospeed.cpp
+ HDRS
+ ../cfgetospeed.h
+ DEPENDS
+ libc.include.termios
+)
+
+add_entrypoint_object(
+ cfsetospeed
+ SRCS
+ cfsetospeed.cpp
+ HDRS
+ ../cfsetospeed.h
+ DEPENDS
+ libc.include.termios
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ tcgetsid
+ SRCS
+ tcgetsid.cpp
+ HDRS
+ ../tcgetsid.h
+ DEPENDS
+ libc.include.sys_syscall
+ libc.include.termios
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ tcdrain
+ SRCS
+ tcdrain.cpp
+ HDRS
+ ../tcdrain.h
+ DEPENDS
+ libc.include.sys_syscall
+ libc.include.termios
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ tcflush
+ SRCS
+ tcflush.cpp
+ HDRS
+ ../tcflush.h
+ DEPENDS
+ libc.include.sys_syscall
+ libc.include.termios
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ tcflow
+ SRCS
+ tcflow.cpp
+ HDRS
+ ../tcflow.h
+ DEPENDS
+ libc.include.sys_syscall
+ libc.include.termios
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ tcsendbreak
+ SRCS
+ tcsendbreak.cpp
+ HDRS
+ ../tcsendbreak.h
+ DEPENDS
+ libc.include.sys_syscall
+ libc.include.termios
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_header_library(
+ kernel_termios
+ HDRS
+ kernel_termios.h
+)
+
+add_entrypoint_object(
+ tcgetattr
+ SRCS
+ tcgetattr.cpp
+ HDRS
+ ../tcgetattr.h
+ DEPENDS
+ .kernel_termios
+ libc.include.sys_syscall
+ libc.include.termios
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ tcsetattr
+ SRCS
+ tcsetattr.cpp
+ HDRS
+ ../tcsetattr.h
+ DEPENDS
+ .kernel_termios
+ libc.include.sys_syscall
+ libc.include.termios
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno
+)
diff --git a/libc/src/termios/linux/cfgetispeed.cpp b/libc/src/termios/linux/cfgetispeed.cpp
new file mode 100644
index 0000000000000..d4877e8cbc6bf
--- /dev/null
+++ b/libc/src/termios/linux/cfgetispeed.cpp
@@ -0,0 +1,21 @@
+//===-- Linux implementation of cfgetispeed -------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/cfgetispeed.h"
+
+#include "src/__support/common.h"
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(speed_t, cfgetispeed, (const struct termios *t)) {
+ return t->c_cflag & CBAUD;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/cfgetospeed.cpp b/libc/src/termios/linux/cfgetospeed.cpp
new file mode 100644
index 0000000000000..5fbe73de29e36
--- /dev/null
+++ b/libc/src/termios/linux/cfgetospeed.cpp
@@ -0,0 +1,21 @@
+//===-- Linux implementation of cfgetospeed -------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/cfgetospeed.h"
+
+#include "src/__support/common.h"
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(speed_t, cfgetospeed, (const struct termios *t)) {
+ return t->c_cflag & CBAUD;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/cfsetispeed.cpp b/libc/src/termios/linux/cfsetispeed.cpp
new file mode 100644
index 0000000000000..b753892508cfc
--- /dev/null
+++ b/libc/src/termios/linux/cfsetispeed.cpp
@@ -0,0 +1,31 @@
+//===-- Linux implementation of cfsetispeed -------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/cfsetispeed.h"
+
+#include "src/__support/common.h"
+
+#include <errno.h>
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, cfsetispeed, (struct termios * t, speed_t speed)) {
+ constexpr speed_t NOT_SPEED_MASK = ~speed_t(CBAUD);
+ // A speed value is valid only if it is equal to one of the B<NN+> values.
+ if (t == nullptr || ((speed & NOT_SPEED_MASK) != 0)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ t->c_cflag = (t->c_cflag & NOT_SPEED_MASK) | speed;
+ t->c_ispeed = speed;
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/cfsetospeed.cpp b/libc/src/termios/linux/cfsetospeed.cpp
new file mode 100644
index 0000000000000..e51f85d221116
--- /dev/null
+++ b/libc/src/termios/linux/cfsetospeed.cpp
@@ -0,0 +1,31 @@
+//===-- Linux implementation of cfsetospeed -------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/cfsetospeed.h"
+
+#include "src/__support/common.h"
+
+#include <errno.h>
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, cfsetospeed, (struct termios * t, speed_t speed)) {
+ constexpr speed_t NOT_SPEED_MASK = ~speed_t(CBAUD);
+ // A speed value is valid only if it is equal to one of the B<NN+> values.
+ if (t == nullptr || ((speed & NOT_SPEED_MASK) != 0)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ t->c_cflag = (t->c_cflag & NOT_SPEED_MASK) | speed;
+ t->c_ospeed = speed;
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/kernel_termios.h b/libc/src/termios/linux/kernel_termios.h
new file mode 100644
index 0000000000000..252f63db3aa6a
--- /dev/null
+++ b/libc/src/termios/linux/kernel_termios.h
@@ -0,0 +1,41 @@
+//===-- Definition of kernel's version of struct termios --------*- C++ -*-===//
+//
+// 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_SRC_TERMIOS_LINUX_KERNEL_TERMIOS_H
+#define LLVM_LIBC_SRC_TERMIOS_LINUX_KERNEL_TERMIOS_H
+
+#include <stddef.h>
+#include <termios.h>
+
+namespace __llvm_libc {
+
+// The kernel's struct termios is
diff erent from the libc's struct termios. The
+// kernel's syscalls expect the size and layout of its definition of struct
+// termios. So, we define a flavor of struct termios which matches that of the
+// kernel so that we can translate between the libc version and the kernel
+// version when passing struct termios objects to syscalls.
+
+// NOTE: The definitions here are generic definitions valid for most target
+// architectures including x86_64 and aarch64. Definitions on some architectures
+// deviate from these generic definitions. Adjustments have to be made for those
+// architectures.
+
+constexpr size_t KERNEL_NCCS = 19;
+
+struct kernel_termios {
+ tcflag_t c_iflag;
+ tcflag_t c_oflag;
+ tcflag_t c_cflag;
+ tcflag_t c_lflag;
+ cc_t c_line;
+ cc_t c_cc[KERNEL_NCCS];
+};
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_TERMIOS_LINUX_KERNEL_TERMIOS_H
diff --git a/libc/src/termios/linux/tcdrain.cpp b/libc/src/termios/linux/tcdrain.cpp
new file mode 100644
index 0000000000000..c59a09b40cde8
--- /dev/null
+++ b/libc/src/termios/linux/tcdrain.cpp
@@ -0,0 +1,30 @@
+//===-- Linux implementation of tcdrain -----------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcdrain.h"
+
+#include "src/__support/OSUtil/syscall.h"
+#include "src/__support/common.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+#include <errno.h>
+#include <sys/syscall.h> // For syscall numbers
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, tcdrain, (int fd)) {
+ long ret = __llvm_libc::syscall_impl(SYS_ioctl, fd, TCSBRK, 1);
+ if (ret < 0) {
+ errno = -ret;
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/tcflow.cpp b/libc/src/termios/linux/tcflow.cpp
new file mode 100644
index 0000000000000..0344f7b527f84
--- /dev/null
+++ b/libc/src/termios/linux/tcflow.cpp
@@ -0,0 +1,30 @@
+//===-- Linux implementation of tcflow -----------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcflow.h"
+
+#include "src/__support/OSUtil/syscall.h"
+#include "src/__support/common.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+#include <errno.h>
+#include <sys/syscall.h> // For syscall numbers
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, tcflow, (int fd, int action)) {
+ long ret = __llvm_libc::syscall_impl(SYS_ioctl, fd, TCXONC, action);
+ if (ret < 0) {
+ errno = -ret;
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/tcflush.cpp b/libc/src/termios/linux/tcflush.cpp
new file mode 100644
index 0000000000000..e916484044511
--- /dev/null
+++ b/libc/src/termios/linux/tcflush.cpp
@@ -0,0 +1,30 @@
+//===-- Linux implementation of tcflush -----------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcflush.h"
+
+#include "src/__support/OSUtil/syscall.h"
+#include "src/__support/common.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+#include <errno.h>
+#include <sys/syscall.h> // For syscall numbers
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, tcflush, (int fd, int queue_selector)) {
+ long ret = __llvm_libc::syscall_impl(SYS_ioctl, fd, TCFLSH, queue_selector);
+ if (ret < 0) {
+ errno = -ret;
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/tcgetattr.cpp b/libc/src/termios/linux/tcgetattr.cpp
new file mode 100644
index 0000000000000..9b3a88901b3e0
--- /dev/null
+++ b/libc/src/termios/linux/tcgetattr.cpp
@@ -0,0 +1,46 @@
+//===-- Linux implementation of tcgetattr ---------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcgetattr.h"
+#include "kernel_termios.h"
+
+#include "src/__support/OSUtil/syscall.h"
+#include "src/__support/common.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+#include <errno.h>
+#include <sys/syscall.h> // For syscall numbers
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, tcgetattr, (int fd, struct termios *t)) {
+ __llvm_libc::kernel_termios kt;
+ long ret = __llvm_libc::syscall_impl(SYS_ioctl, fd, TCGETS, &kt);
+ if (ret < 0) {
+ errno = -ret;
+ return -1;
+ }
+ t->c_iflag = kt.c_iflag;
+ t->c_oflag = kt.c_oflag;
+ t->c_cflag = kt.c_cflag;
+ t->c_lflag = kt.c_lflag;
+ t->c_ispeed = kt.c_cflag & CBAUD;
+ t->c_ospeed = kt.c_cflag & CBAUD;
+
+ size_t nccs = KERNEL_NCCS <= NCCS ? KERNEL_NCCS : NCCS;
+ for (size_t i = 0; i < nccs; ++i)
+ t->c_cc[i] = kt.c_cc[i];
+ if (NCCS > nccs) {
+ for (size_t i = nccs; i < NCCS; ++i)
+ t->c_cc[i] = 0;
+ }
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/tcgetsid.cpp b/libc/src/termios/linux/tcgetsid.cpp
new file mode 100644
index 0000000000000..8f0923431a428
--- /dev/null
+++ b/libc/src/termios/linux/tcgetsid.cpp
@@ -0,0 +1,31 @@
+//===-- Linux implementation of tcgetsid ----------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcgetsid.h"
+
+#include "src/__support/OSUtil/syscall.h"
+#include "src/__support/common.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+#include <errno.h>
+#include <sys/syscall.h> // For syscall numbers
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(pid_t, tcgetsid, (int fd)) {
+ pid_t sid;
+ long ret = __llvm_libc::syscall_impl(SYS_ioctl, fd, TIOCGSID, &sid);
+ if (ret < 0) {
+ errno = -ret;
+ return -1;
+ }
+ return sid;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/tcsendbreak.cpp b/libc/src/termios/linux/tcsendbreak.cpp
new file mode 100644
index 0000000000000..18aeba6b80988
--- /dev/null
+++ b/libc/src/termios/linux/tcsendbreak.cpp
@@ -0,0 +1,33 @@
+//===-- Linux implementation of tcsendbreak -------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcsendbreak.h"
+
+#include "src/__support/OSUtil/syscall.h"
+#include "src/__support/common.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+#include <errno.h>
+#include <sys/syscall.h> // For syscall numbers
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(pid_t, tcsendbreak, (int fd, int /* unused duration */)) {
+ // POSIX leaves the behavior for non-zero duration implementation dependent.
+ // Which means that the behavior can be the same as it is when duration is
+ // zero. So, we just pass zero to the syscall.
+ long ret = __llvm_libc::syscall_impl(SYS_ioctl, fd, TCSBRK, 0);
+ if (ret < 0) {
+ errno = -ret;
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/linux/tcsetattr.cpp b/libc/src/termios/linux/tcsetattr.cpp
new file mode 100644
index 0000000000000..edcae88aa7731
--- /dev/null
+++ b/libc/src/termios/linux/tcsetattr.cpp
@@ -0,0 +1,62 @@
+//===-- Linux implementation of tcsetattr ---------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcsetattr.h"
+#include "kernel_termios.h"
+
+#include "src/__support/OSUtil/syscall.h"
+#include "src/__support/common.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+#include <errno.h>
+#include <sys/syscall.h> // For syscall numbers
+#include <termios.h>
+
+namespace __llvm_libc {
+
+LLVM_LIBC_FUNCTION(int, tcsetattr,
+ (int fd, int actions, const struct termios *t)) {
+ struct kernel_termios kt;
+ long cmd;
+
+ switch (actions) {
+ case TCSANOW:
+ cmd = TCSETS;
+ break;
+ case TCSADRAIN:
+ cmd = TCSETSW;
+ break;
+ case TCSAFLUSH:
+ cmd = TCSETSF;
+ break;
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+
+ kt.c_iflag = t->c_iflag;
+ kt.c_oflag = t->c_oflag;
+ kt.c_cflag = t->c_cflag;
+ kt.c_lflag = t->c_lflag;
+ size_t nccs = KERNEL_NCCS <= NCCS ? KERNEL_NCCS : NCCS;
+ for (size_t i = 0; i < nccs; ++i)
+ kt.c_cc[i] = t->c_cc[i];
+ if (nccs < KERNEL_NCCS) {
+ for (size_t i = nccs; i < KERNEL_NCCS; ++i)
+ kt.c_cc[i] = 0;
+ }
+
+ long ret = __llvm_libc::syscall_impl(SYS_ioctl, fd, cmd, &kt);
+ if (ret < 0) {
+ errno = -ret;
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace __llvm_libc
diff --git a/libc/src/termios/tcdrain.h b/libc/src/termios/tcdrain.h
new file mode 100644
index 0000000000000..908d821378b90
--- /dev/null
+++ b/libc/src/termios/tcdrain.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for tcdrain -----------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_TCDRAIN_H
+#define LLVM_LIBC_SRC_UNISTD_TCDRAIN_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int tcdrain(int fd);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_TCDRAIN_H
diff --git a/libc/src/termios/tcflow.h b/libc/src/termios/tcflow.h
new file mode 100644
index 0000000000000..4d45cbfd86eba
--- /dev/null
+++ b/libc/src/termios/tcflow.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for tcflow ------------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_TCFLOW_H
+#define LLVM_LIBC_SRC_UNISTD_TCFLOW_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int tcflow(int fd, int action);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_TCFLOW_H
diff --git a/libc/src/termios/tcflush.h b/libc/src/termios/tcflush.h
new file mode 100644
index 0000000000000..9dbcca371b466
--- /dev/null
+++ b/libc/src/termios/tcflush.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for tcflush -----------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_TCFLUSH_H
+#define LLVM_LIBC_SRC_UNISTD_TCFLUSH_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int tcflush(int fd, int queue_selector);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_TCFLUSH_H
diff --git a/libc/src/termios/tcgetattr.h b/libc/src/termios/tcgetattr.h
new file mode 100644
index 0000000000000..61fdcdbdfd8b9
--- /dev/null
+++ b/libc/src/termios/tcgetattr.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for tcgetattr ---------------------*- C++ -*-===//
+//
+// 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_SRC_TERMIOS_TCGETATTR_H
+#define LLVM_LIBC_SRC_TERMIOS_TCGETATTR_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int tcgetattr(int fd, struct termios *t);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_TERMIOS_TCGETATTR_H
diff --git a/libc/src/termios/tcgetsid.h b/libc/src/termios/tcgetsid.h
new file mode 100644
index 0000000000000..1d8934764a7af
--- /dev/null
+++ b/libc/src/termios/tcgetsid.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for tcgetsid ----------------------*- C++ -*-===//
+//
+// 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_SRC_TERMIOS_TCGETSID_H
+#define LLVM_LIBC_SRC_TERMIOS_TCGETSID_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+pid_t tcgetsid(int fd);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_TERMIOS_TCGETSID_H
diff --git a/libc/src/termios/tcsendbreak.h b/libc/src/termios/tcsendbreak.h
new file mode 100644
index 0000000000000..7ad169517c222
--- /dev/null
+++ b/libc/src/termios/tcsendbreak.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for tcsendbreak -------------------*- C++ -*-===//
+//
+// 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_SRC_UNISTD_TCSENDBREAK_H
+#define LLVM_LIBC_SRC_UNISTD_TCSENDBREAK_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int tcsendbreak(int fd, int duration);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_UNISTD_TCSENDBREAK_H
diff --git a/libc/src/termios/tcsetattr.h b/libc/src/termios/tcsetattr.h
new file mode 100644
index 0000000000000..a7fdfd7d57625
--- /dev/null
+++ b/libc/src/termios/tcsetattr.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for tcsetattr ---------------------*- C++ -*-===//
+//
+// 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_SRC_TERMIOS_TCSETATTR_H
+#define LLVM_LIBC_SRC_TERMIOS_TCSETATTR_H
+
+#include <termios.h>
+
+namespace __llvm_libc {
+
+int tcsetattr(int fd, int actions, const struct termios *t);
+
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_SRC_TERMIOS_TCSETATTR_H
diff --git a/libc/test/src/CMakeLists.txt b/libc/test/src/CMakeLists.txt
index 3667f33d169ab..5e954e0d05352 100644
--- a/libc/test/src/CMakeLists.txt
+++ b/libc/test/src/CMakeLists.txt
@@ -40,6 +40,7 @@ if(${LIBC_TARGET_OS} STREQUAL "linux")
add_subdirectory(fcntl)
add_subdirectory(sched)
add_subdirectory(sys)
+ add_subdirectory(termios)
add_subdirectory(unistd)
endif()
diff --git a/libc/test/src/termios/CMakeLists.txt b/libc/test/src/termios/CMakeLists.txt
new file mode 100644
index 0000000000000..ce11de440cafa
--- /dev/null
+++ b/libc/test/src/termios/CMakeLists.txt
@@ -0,0 +1,22 @@
+add_libc_testsuite(libc_termios_unittests)
+
+add_libc_unittest(
+ termios_test
+ SUITE
+ libc_termios_unittests
+ SRCS
+ termios_test.cpp
+ DEPENDS
+ libc.include.errno
+ libc.include.termios
+ libc.src.fcntl.open
+ libc.src.termios.cfgetispeed
+ libc.src.termios.cfgetospeed
+ libc.src.termios.cfsetispeed
+ libc.src.termios.cfsetospeed
+ libc.src.termios.tcgetattr
+ libc.src.termios.tcgetsid
+ libc.src.termios.tcsetattr
+ libc.src.unistd.close
+ libc.test.errno_setter_matcher
+)
diff --git a/libc/test/src/termios/termios_test.cpp b/libc/test/src/termios/termios_test.cpp
new file mode 100644
index 0000000000000..beec5cedd2356
--- /dev/null
+++ b/libc/test/src/termios/termios_test.cpp
@@ -0,0 +1,61 @@
+//===-- Unittests for a bunch of functions in 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/fcntl/open.h"
+#include "src/termios/cfgetispeed.h"
+#include "src/termios/cfgetospeed.h"
+#include "src/termios/cfsetispeed.h"
+#include "src/termios/cfsetospeed.h"
+#include "src/termios/tcgetattr.h"
+#include "src/termios/tcgetsid.h"
+#include "src/termios/tcsetattr.h"
+#include "src/unistd/close.h"
+#include "test/ErrnoSetterMatcher.h"
+#include "utils/UnitTest/Test.h"
+
+#include <errno.h>
+#include <termios.h>
+
+using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
+using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
+
+// We just list a bunch of smoke tests here as it is not possible to
+// test functionality at the least because we want to run the tests
+// from ninja/make which change the terminal behavior.
+
+TEST(LlvmLibcTermiosTest, SpeedSmokeTest) {
+ struct termios t;
+ errno = 0;
+ ASSERT_THAT(__llvm_libc::cfsetispeed(&t, B50), Succeeds(0));
+ ASSERT_EQ(__llvm_libc::cfgetispeed(&t), speed_t(B50));
+ ASSERT_THAT(__llvm_libc::cfsetospeed(&t, B75), Succeeds(0));
+ ASSERT_EQ(__llvm_libc::cfgetospeed(&t), speed_t(B75));
+
+ errno = 0;
+ ASSERT_THAT(__llvm_libc::cfsetispeed(&t, ~CBAUD), Fails(EINVAL));
+ errno = 0;
+ ASSERT_THAT(__llvm_libc::cfsetospeed(&t, ~CBAUD), Fails(EINVAL));
+}
+
+TEST(LlvmLibcTermiosTest, GetAttrSmokeTest) {
+ struct termios t;
+ errno = 0;
+ int fd = __llvm_libc::open("/dev/tty", O_RDONLY);
+ ASSERT_EQ(errno, 0);
+ ASSERT_GT(fd, 0);
+ ASSERT_THAT(__llvm_libc::tcgetattr(fd, &t), Succeeds(0));
+ ASSERT_EQ(__llvm_libc::close(fd), 0);
+}
+
+TEST(LlvmLibcTermiosTest, TcGetSidSmokeTest) {
+ int fd = __llvm_libc::open("/dev/tty", O_RDONLY);
+ ASSERT_EQ(errno, 0);
+ ASSERT_GT(fd, 0);
+ ASSERT_GT(__llvm_libc::tcgetsid(fd), pid_t(0));
+ ASSERT_EQ(__llvm_libc::close(fd), 0);
+}
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