[libc-commits] [libc] [libc] Implement tcsetwinsize in termios (PR #228498)
Aman Maurya via libc-commits
libc-commits at lists.llvm.org
Fri Oct 9 04:16:13 PDT 2026
https://github.com/amanmaurya92 updated https://github.com/llvm/llvm-project/pull/228498
>From 9d3245afed8a15301b4cf35e874aef40836e4b4c Mon Sep 17 00:00:00 2001
From: amanmaurya92 <amanmaurya9209 at gmail.com>
Date: Fri, 2 Oct 2026 21:27:37 +0530
Subject: [PATCH 1/3] [libc] Implement tcsetwinsize in termios
Implement the standard POSIX.1-2024 function tcsetwinsize in <termios.h>.
Fixes #228380
---
libc/config/linux/aarch64/entrypoints.txt | 1 +
libc/config/linux/riscv/entrypoints.txt | 1 +
libc/config/linux/x86_64/entrypoints.txt | 1 +
libc/include/CMakeLists.txt | 1 +
libc/include/termios.yaml | 9 +++
libc/src/termios/CMakeLists.txt | 8 +++
libc/src/termios/linux/CMakeLists.txt | 15 +++++
libc/src/termios/linux/tcsetwinsize.cpp | 38 +++++++++++
libc/src/termios/tcsetwinsize.h | 26 ++++++++
libc/test/src/termios/CMakeLists.txt | 19 ++++++
libc/test/src/termios/tcsetwinsize_test.cpp | 71 +++++++++++++++++++++
11 files changed, 190 insertions(+)
create mode 100644 libc/src/termios/linux/tcsetwinsize.cpp
create mode 100644 libc/src/termios/tcsetwinsize.h
create mode 100644 libc/test/src/termios/tcsetwinsize_test.cpp
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index c7ded2fade05d9..f43e2b906fdfc0 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -437,6 +437,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.termios.tcgetsid
libc.src.termios.tcsendbreak
libc.src.termios.tcsetattr
+ libc.src.termios.tcsetwinsize
# unistd.h entrypoints
libc.src.unistd.alarm
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 296985eeff937c..517da3cdab83a2 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -456,6 +456,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.termios.tcgetsid
libc.src.termios.tcsendbreak
libc.src.termios.tcsetattr
+ libc.src.termios.tcsetwinsize
# unistd.h entrypoints
libc.src.unistd.alarm
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 7928a35a6284a5..319a90216d93e4 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -476,6 +476,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.termios.tcgetsid
libc.src.termios.tcsendbreak
libc.src.termios.tcsetattr
+ libc.src.termios.tcsetwinsize
# unistd.h entrypoints
libc.src.unistd.alarm
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 2fe1f92afc1d19..59deca11a9cdd2 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -1197,6 +1197,7 @@ add_header_macro(
.llvm-libc-types.pid_t
.llvm-libc-types.speed_t
.llvm-libc-types.struct_termios
+ .llvm-libc-types.struct_winsize
.llvm-libc-types.tcflag_t
)
diff --git a/libc/include/termios.yaml b/libc/include/termios.yaml
index 21ee25d700d9ae..ef89c430253d5a 100644
--- a/libc/include/termios.yaml
+++ b/libc/include/termios.yaml
@@ -10,6 +10,7 @@ types:
- type_name: speed_t
- type_name: pid_t
- type_name: cc_t
+ - type_name: struct_winsize
enums: []
objects: []
functions:
@@ -87,3 +88,11 @@ functions:
- type: int
- type: int
- type: struct termios *
+ - name: tcsetwinsize
+ standards:
+ - posix
+ return_type: int
+ arguments:
+ - type: int
+ - type: const struct winsize *
+
diff --git a/libc/src/termios/CMakeLists.txt b/libc/src/termios/CMakeLists.txt
index 0fbd632b78fbda..dd9516690e9862 100644
--- a/libc/src/termios/CMakeLists.txt
+++ b/libc/src/termios/CMakeLists.txt
@@ -78,3 +78,11 @@ add_entrypoint_object(
DEPENDS
.${LIBC_TARGET_OS}.tcsetattr
)
+
+add_entrypoint_object(
+ tcsetwinsize
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.tcsetwinsize
+)
+
diff --git a/libc/src/termios/linux/CMakeLists.txt b/libc/src/termios/linux/CMakeLists.txt
index 86565cf1294c7d..1e18156c32784d 100644
--- a/libc/src/termios/linux/CMakeLists.txt
+++ b/libc/src/termios/linux/CMakeLists.txt
@@ -162,3 +162,18 @@ add_entrypoint_object(
libc.src.errno.errno
libc.src.__support.macros.null_check
)
+
+add_entrypoint_object(
+ tcsetwinsize
+ SRCS
+ tcsetwinsize.cpp
+ HDRS
+ ../tcsetwinsize.h
+ DEPENDS
+ libc.hdr.types.struct_winsize
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
+ libc.src.errno.errno
+ libc.src.__support.macros.config
+ libc.src.__support.macros.null_check
+)
+
diff --git a/libc/src/termios/linux/tcsetwinsize.cpp b/libc/src/termios/linux/tcsetwinsize.cpp
new file mode 100644
index 00000000000000..dfe28209e75276
--- /dev/null
+++ b/libc/src/termios/linux/tcsetwinsize.cpp
@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Linux implementation of tcsetwinsize.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/termios/tcsetwinsize.h"
+
+#include "hdr/types/struct_winsize.h"
+#include "src/__support/OSUtil/linux/syscall_wrappers/ioctl.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/macros/null_check.h"
+
+#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, tcsetwinsize, (int fd, const struct winsize *ws)) {
+ LIBC_CRASH_ON_NULLPTR(ws);
+
+ auto ret = linux_syscalls::ioctl(fd, TIOCSWINSZ, ws);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/termios/tcsetwinsize.h b/libc/src/termios/tcsetwinsize.h
new file mode 100644
index 00000000000000..48d5d300602877
--- /dev/null
+++ b/libc/src/termios/tcsetwinsize.h
@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Header file for tcsetwinsize function.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_TERMIOS_TCSETWINSIZE_H
+#define LLVM_LIBC_SRC_TERMIOS_TCSETWINSIZE_H
+
+#include "hdr/types/struct_winsize.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int tcsetwinsize(int fd, const struct winsize *ws);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_TERMIOS_TCSETWINSIZE_H
diff --git a/libc/test/src/termios/CMakeLists.txt b/libc/test/src/termios/CMakeLists.txt
index a802b3e7aba2aa..2228af98780c33 100644
--- a/libc/test/src/termios/CMakeLists.txt
+++ b/libc/test/src/termios/CMakeLists.txt
@@ -23,3 +23,22 @@ add_libc_test(
libc.test.UnitTest.ErrnoCheckingTest
libc.test.UnitTest.ErrnoSetterMatcher
)
+
+add_libc_test(
+ tcsetwinsize_test
+ SUITE
+ libc_termios_unittests
+ SRCS
+ tcsetwinsize_test.cpp
+ DEPENDS
+ libc.hdr.fcntl_macros
+ libc.hdr.types.struct_winsize
+ libc.src.errno.errno
+ libc.src.fcntl.open
+ libc.src.termios.tcsetwinsize
+ libc.src.unistd.close
+ libc.src.unistd.pipe
+ libc.test.UnitTest.ErrnoCheckingTest
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
+
diff --git a/libc/test/src/termios/tcsetwinsize_test.cpp b/libc/test/src/termios/tcsetwinsize_test.cpp
new file mode 100644
index 00000000000000..4457a65dce89b4
--- /dev/null
+++ b/libc/test/src/termios/tcsetwinsize_test.cpp
@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Unit tests for tcsetwinsize.
+///
+//===----------------------------------------------------------------------===//
+
+#include "hdr/fcntl_macros.h"
+#include "hdr/types/struct_winsize.h"
+#include "src/__support/libc_errno.h"
+#include "src/fcntl/open.h"
+#include "src/termios/tcsetwinsize.h"
+#include "src/unistd/close.h"
+#include "src/unistd/pipe.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using LlvmLibcTcSetWinSizeTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+
+TEST_F(LlvmLibcTcSetWinSizeTest, InvalidFileDescriptor) {
+ constexpr unsigned short TEST_ROWS = 24;
+ constexpr unsigned short TEST_COLS = 80;
+ struct winsize ws = {TEST_ROWS, TEST_COLS, 0, 0};
+ ASSERT_THAT(LIBC_NAMESPACE::tcsetwinsize(-1, &ws), Fails(EBADF));
+}
+
+TEST_F(LlvmLibcTcSetWinSizeTest, NonTerminalFileDescriptor) {
+ int pipefd[2];
+ ASSERT_THAT(LIBC_NAMESPACE::pipe(pipefd), Succeeds(0));
+
+ constexpr unsigned short TEST_ROWS = 24;
+ constexpr unsigned short TEST_COLS = 80;
+ struct winsize ws = {TEST_ROWS, TEST_COLS, 0, 0};
+ ASSERT_THAT(LIBC_NAMESPACE::tcsetwinsize(pipefd[0], &ws), Fails(ENOTTY));
+ ASSERT_THAT(LIBC_NAMESPACE::tcsetwinsize(pipefd[1], &ws), Fails(ENOTTY));
+
+ ASSERT_THAT(LIBC_NAMESPACE::close(pipefd[0]), Succeeds(0));
+ ASSERT_THAT(LIBC_NAMESPACE::close(pipefd[1]), Succeeds(0));
+}
+
+TEST_F(LlvmLibcTcSetWinSizeTest, TerminalSmokeTest) {
+ int fd = LIBC_NAMESPACE::open("/dev/ptmx", O_RDWR);
+ if (fd < 0)
+ fd = LIBC_NAMESPACE::open("/dev/tty", O_RDWR);
+
+ if (fd < 0) {
+ // When no terminal is available, gracefully skip the test.
+ libc_errno = 0;
+ return;
+ }
+ ASSERT_ERRNO_SUCCESS();
+
+ constexpr unsigned short TEST_ROWS = 30;
+ constexpr unsigned short TEST_COLS = 100;
+ struct winsize ws = {TEST_ROWS, TEST_COLS, 0, 0};
+ int ret = LIBC_NAMESPACE::tcsetwinsize(fd, &ws);
+ if (ret < 0) {
+ ASSERT_ERRNO_EQ(ENOTTY);
+ } else {
+ ASSERT_ERRNO_SUCCESS();
+ }
+ ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
+}
>From f8ab73e19291d89b95bf448a3bb282f4e0ce1d1c Mon Sep 17 00:00:00 2001
From: amanmaurya92 <amanmaurya9209 at gmail.com>
Date: Tue, 6 Oct 2026 21:36:51 +0530
Subject: [PATCH 2/3] [libc] Address review feedback for tcsetwinsize
- Remove LIBC_CRASH_ON_NULLPTR and let kernel return EFAULT
- Use scope_exit to close file descriptors in unit tests
- Remove braces on single-statement if/else bodies
- Add NullPointer unit test checking for EFAULT
---
libc/src/termios/linux/CMakeLists.txt | 1 -
libc/src/termios/linux/tcsetwinsize.cpp | 3 --
libc/test/src/termios/CMakeLists.txt | 1 +
libc/test/src/termios/tcsetwinsize_test.cpp | 31 +++++++++++++++++----
4 files changed, 26 insertions(+), 10 deletions(-)
diff --git a/libc/src/termios/linux/CMakeLists.txt b/libc/src/termios/linux/CMakeLists.txt
index 1e18156c32784d..2da7fcd861f47c 100644
--- a/libc/src/termios/linux/CMakeLists.txt
+++ b/libc/src/termios/linux/CMakeLists.txt
@@ -174,6 +174,5 @@ add_entrypoint_object(
libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
libc.src.__support.macros.config
- libc.src.__support.macros.null_check
)
diff --git a/libc/src/termios/linux/tcsetwinsize.cpp b/libc/src/termios/linux/tcsetwinsize.cpp
index dfe28209e75276..485fa0758f06ca 100644
--- a/libc/src/termios/linux/tcsetwinsize.cpp
+++ b/libc/src/termios/linux/tcsetwinsize.cpp
@@ -18,15 +18,12 @@
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
-#include "src/__support/macros/null_check.h"
#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, tcsetwinsize, (int fd, const struct winsize *ws)) {
- LIBC_CRASH_ON_NULLPTR(ws);
-
auto ret = linux_syscalls::ioctl(fd, TIOCSWINSZ, ws);
if (!ret.has_value()) {
libc_errno = ret.error();
diff --git a/libc/test/src/termios/CMakeLists.txt b/libc/test/src/termios/CMakeLists.txt
index 2228af98780c33..4ef43f3a09c56a 100644
--- a/libc/test/src/termios/CMakeLists.txt
+++ b/libc/test/src/termios/CMakeLists.txt
@@ -33,6 +33,7 @@ add_libc_test(
DEPENDS
libc.hdr.fcntl_macros
libc.hdr.types.struct_winsize
+ libc.src.__support.CPP.scope
libc.src.errno.errno
libc.src.fcntl.open
libc.src.termios.tcsetwinsize
diff --git a/libc/test/src/termios/tcsetwinsize_test.cpp b/libc/test/src/termios/tcsetwinsize_test.cpp
index 4457a65dce89b4..add9d141b31212 100644
--- a/libc/test/src/termios/tcsetwinsize_test.cpp
+++ b/libc/test/src/termios/tcsetwinsize_test.cpp
@@ -13,6 +13,7 @@
#include "hdr/fcntl_macros.h"
#include "hdr/types/struct_winsize.h"
+#include "src/__support/CPP/scope.h"
#include "src/__support/libc_errno.h"
#include "src/fcntl/open.h"
#include "src/termios/tcsetwinsize.h"
@@ -35,15 +36,16 @@ TEST_F(LlvmLibcTcSetWinSizeTest, InvalidFileDescriptor) {
TEST_F(LlvmLibcTcSetWinSizeTest, NonTerminalFileDescriptor) {
int pipefd[2];
ASSERT_THAT(LIBC_NAMESPACE::pipe(pipefd), Succeeds(0));
+ LIBC_NAMESPACE::cpp::scope_exit close_pipe([&] {
+ ASSERT_THAT(LIBC_NAMESPACE::close(pipefd[0]), Succeeds(0));
+ ASSERT_THAT(LIBC_NAMESPACE::close(pipefd[1]), Succeeds(0));
+ });
constexpr unsigned short TEST_ROWS = 24;
constexpr unsigned short TEST_COLS = 80;
struct winsize ws = {TEST_ROWS, TEST_COLS, 0, 0};
ASSERT_THAT(LIBC_NAMESPACE::tcsetwinsize(pipefd[0], &ws), Fails(ENOTTY));
ASSERT_THAT(LIBC_NAMESPACE::tcsetwinsize(pipefd[1], &ws), Fails(ENOTTY));
-
- ASSERT_THAT(LIBC_NAMESPACE::close(pipefd[0]), Succeeds(0));
- ASSERT_THAT(LIBC_NAMESPACE::close(pipefd[1]), Succeeds(0));
}
TEST_F(LlvmLibcTcSetWinSizeTest, TerminalSmokeTest) {
@@ -57,15 +59,32 @@ TEST_F(LlvmLibcTcSetWinSizeTest, TerminalSmokeTest) {
return;
}
ASSERT_ERRNO_SUCCESS();
+ LIBC_NAMESPACE::cpp::scope_exit close_fd(
+ [&] { ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); });
constexpr unsigned short TEST_ROWS = 30;
constexpr unsigned short TEST_COLS = 100;
struct winsize ws = {TEST_ROWS, TEST_COLS, 0, 0};
int ret = LIBC_NAMESPACE::tcsetwinsize(fd, &ws);
- if (ret < 0) {
+ if (ret < 0)
ASSERT_ERRNO_EQ(ENOTTY);
- } else {
+ else
ASSERT_ERRNO_SUCCESS();
+}
+
+TEST_F(LlvmLibcTcSetWinSizeTest, NullPointer) {
+ int fd = LIBC_NAMESPACE::open("/dev/ptmx", O_RDWR);
+ if (fd < 0)
+ fd = LIBC_NAMESPACE::open("/dev/tty", O_RDWR);
+
+ if (fd < 0) {
+ // When no terminal is available, gracefully skip the test.
+ libc_errno = 0;
+ return;
}
- ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
+ ASSERT_ERRNO_SUCCESS();
+ LIBC_NAMESPACE::cpp::scope_exit close_fd(
+ [&] { ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); });
+
+ ASSERT_THAT(LIBC_NAMESPACE::tcsetwinsize(fd, nullptr), Fails(EFAULT));
}
>From fb71dbcec5b87fb9f55be756f6590e423f7f9e2c Mon Sep 17 00:00:00 2001
From: amanmaurya92 <amanmaurya9209 at gmail.com>
Date: Wed, 7 Oct 2026 07:00:06 +0530
Subject: [PATCH 3/3] [libc] Use proxy header for ioctl macros and avoid
/dev/tty in tcsetwinsize test
- Include hdr/sys_ioctl_macros.h instead of asm/ioctls.h
- Restrict tests to /dev/ptmx to avoid resizing user's terminal window
---
libc/src/termios/linux/CMakeLists.txt | 1 +
libc/src/termios/linux/tcsetwinsize.cpp | 3 +--
libc/test/src/termios/tcsetwinsize_test.cpp | 21 +++++++++++++--------
3 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/libc/src/termios/linux/CMakeLists.txt b/libc/src/termios/linux/CMakeLists.txt
index 2da7fcd861f47c..93133b5a79b45b 100644
--- a/libc/src/termios/linux/CMakeLists.txt
+++ b/libc/src/termios/linux/CMakeLists.txt
@@ -170,6 +170,7 @@ add_entrypoint_object(
HDRS
../tcsetwinsize.h
DEPENDS
+ libc.hdr.sys_ioctl_macros
libc.hdr.types.struct_winsize
libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
diff --git a/libc/src/termios/linux/tcsetwinsize.cpp b/libc/src/termios/linux/tcsetwinsize.cpp
index 485fa0758f06ca..0fe5af12464ca4 100644
--- a/libc/src/termios/linux/tcsetwinsize.cpp
+++ b/libc/src/termios/linux/tcsetwinsize.cpp
@@ -13,14 +13,13 @@
#include "src/termios/tcsetwinsize.h"
+#include "hdr/sys_ioctl_macros.h"
#include "hdr/types/struct_winsize.h"
#include "src/__support/OSUtil/linux/syscall_wrappers/ioctl.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
-#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
-
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, tcsetwinsize, (int fd, const struct winsize *ws)) {
diff --git a/libc/test/src/termios/tcsetwinsize_test.cpp b/libc/test/src/termios/tcsetwinsize_test.cpp
index add9d141b31212..cdcdfbca6f19fe 100644
--- a/libc/test/src/termios/tcsetwinsize_test.cpp
+++ b/libc/test/src/termios/tcsetwinsize_test.cpp
@@ -49,12 +49,11 @@ TEST_F(LlvmLibcTcSetWinSizeTest, NonTerminalFileDescriptor) {
}
TEST_F(LlvmLibcTcSetWinSizeTest, TerminalSmokeTest) {
+ // Use a pseudo-terminal master rather than /dev/tty so running tests in an
+ // interactive terminal does not resize the user's window.
int fd = LIBC_NAMESPACE::open("/dev/ptmx", O_RDWR);
- if (fd < 0)
- fd = LIBC_NAMESPACE::open("/dev/tty", O_RDWR);
-
if (fd < 0) {
- // When no terminal is available, gracefully skip the test.
+ // When /dev/ptmx is not available, gracefully skip the test.
libc_errno = 0;
return;
}
@@ -74,11 +73,8 @@ TEST_F(LlvmLibcTcSetWinSizeTest, TerminalSmokeTest) {
TEST_F(LlvmLibcTcSetWinSizeTest, NullPointer) {
int fd = LIBC_NAMESPACE::open("/dev/ptmx", O_RDWR);
- if (fd < 0)
- fd = LIBC_NAMESPACE::open("/dev/tty", O_RDWR);
-
if (fd < 0) {
- // When no terminal is available, gracefully skip the test.
+ // When /dev/ptmx is not available, gracefully skip the test.
libc_errno = 0;
return;
}
@@ -86,5 +82,14 @@ TEST_F(LlvmLibcTcSetWinSizeTest, NullPointer) {
LIBC_NAMESPACE::cpp::scope_exit close_fd(
[&] { ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0)); });
+ constexpr unsigned short TEST_ROWS = 24;
+ constexpr unsigned short TEST_COLS = 80;
+ struct winsize ws = {TEST_ROWS, TEST_COLS, 0, 0};
+ int ret = LIBC_NAMESPACE::tcsetwinsize(fd, &ws);
+ if (ret < 0) {
+ ASSERT_ERRNO_EQ(ENOTTY);
+ return;
+ }
+
ASSERT_THAT(LIBC_NAMESPACE::tcsetwinsize(fd, nullptr), Fails(EFAULT));
}
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