[libc-commits] [libc] Recommit "[libc] Introduce the ioctl syscall wrapper and port all callers (#204640)" (PR #205317)
Pavel Labath via libc-commits
libc-commits at lists.llvm.org
Tue Jun 23 03:55:36 PDT 2026
https://github.com/labath created https://github.com/llvm/llvm-project/pull/205317
This path reapplies #204640 (reverted in #205277), due to (-Werror)
build failure with gcc. Gcc warned about passing an uninitialized
structure through a `const void *` argument. This isn't a problem
because the ioctls in question write to that argument. The
fix/workaround is to provide a `void *` overload.
The original commit message was:
This patch adds an ioctl syscall wrapper in linux_syscalls namespace and
migrates all direct SYS_ioctl calls to use it.
To handle the polymorphic nature of ioctl arguments (where some commands
expect pointers, some expect scalar integers like queue_selector, and
some expect no argument at all), I use a helper struct IoctlArg with
implicit constructors. This avoids template bloat and overload
ambiguities (particularly around literal 0) while keeping call sites
clean.
Assisted by Gemini.
>From c62cc7c8f8ad7ea9ebcbc8037499acf7bddb531c Mon Sep 17 00:00:00 2001
From: Pavel Labath <pavel at labath.sk>
Date: Tue, 23 Jun 2026 09:08:09 +0200
Subject: [PATCH 1/2] Recommit "[libc] Introduce the ioctl syscall wrapper and
port all callers (#204640)"
This path reapplies #204640 (reverted in #205277), due to (-Werror)
build failure with gcc. Gcc warned about passing an uninitialized
structure through a `const void *` argument. This isn't a problem
because the ioctls in question write to that argument. The
fix/workaround is to provide a `void *` overload.
The original commit message was:
This patch adds an ioctl syscall wrapper in linux_syscalls namespace and
migrates all direct SYS_ioctl calls to use it.
To handle the polymorphic nature of ioctl arguments (where some commands
expect pointers, some expect scalar integers like queue_selector, and
some expect no argument at all), I use a helper struct IoctlArg with
implicit constructors. This avoids template bloat and overload
ambiguities (particularly around literal 0) while keeping call sites
clean.
Assisted by Gemini.
---
.../linux/syscall_wrappers/CMakeLists.txt | 13 +++++
.../OSUtil/linux/syscall_wrappers/ioctl.h | 49 +++++++++++++++++++
libc/src/sys/ioctl/linux/CMakeLists.txt | 3 +-
libc/src/sys/ioctl/linux/ioctl.cpp | 15 +++---
libc/src/termios/linux/CMakeLists.txt | 21 +++-----
libc/src/termios/linux/tcdrain.cpp | 9 ++--
libc/src/termios/linux/tcflow.cpp | 9 ++--
libc/src/termios/linux/tcflush.cpp | 10 ++--
libc/src/termios/linux/tcgetattr.cpp | 12 ++---
libc/src/termios/linux/tcgetsid.cpp | 10 ++--
libc/src/termios/linux/tcsendbreak.cpp | 9 ++--
libc/src/termios/linux/tcsetattr.cpp | 12 ++---
libc/src/unistd/linux/CMakeLists.txt | 5 +-
libc/src/unistd/linux/isatty.cpp | 13 ++---
14 files changed, 114 insertions(+), 76 deletions(-)
create mode 100644 libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
index a52be9676a3ca..f3282c315d9a9 100644
--- a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
@@ -706,6 +706,19 @@ add_header_library(
libc.include.sys_syscall
)
+add_header_library(
+ ioctl
+ HDRS
+ ioctl.h
+ DEPENDS
+ libc.src.__support.CPP.type_traits
+ libc.src.__support.OSUtil.osutil
+ libc.src.__support.error_or
+ libc.src.__support.macros.attributes
+ libc.src.__support.macros.config
+ libc.include.sys_syscall
+)
+
add_header_library(
readlink
HDRS
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h b/libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h
new file mode 100644
index 0000000000000..9410bbbcad8cd
--- /dev/null
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h
@@ -0,0 +1,49 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Syscall wrapper for ioctl.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_IOCTL_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_IOCTL_H
+
+#include "src/__support/CPP/type_traits/enable_if.h"
+#include "src/__support/CPP/type_traits/is_integral.h"
+#include "src/__support/CPP/type_traits/is_null_pointer.h"
+#include "src/__support/CPP/type_traits/is_pointer.h"
+#include "src/__support/OSUtil/linux/syscall.h" // syscall_checked
+#include "src/__support/error_or.h"
+#include "src/__support/macros/attributes.h" // LIBC_INLINE
+#include "src/__support/macros/config.h"
+#include <sys/syscall.h> // For syscall numbers
+
+namespace LIBC_NAMESPACE_DECL {
+namespace linux_syscalls {
+
+struct IoctlArg {
+ unsigned long val;
+
+ LIBC_INLINE IoctlArg(const void *ptr)
+ : val(reinterpret_cast<unsigned long>(ptr)) {}
+
+ template <typename T, cpp::enable_if_t<cpp::is_integral_v<T>, int> = 0>
+ LIBC_INLINE constexpr IoctlArg(T num = 0)
+ : val(static_cast<unsigned long>(num)) {}
+};
+
+LIBC_INLINE ErrorOr<int> ioctl(int fd, unsigned long request,
+ IoctlArg arg = 0) {
+ return syscall_checked<int>(SYS_ioctl, fd, request, arg.val);
+}
+
+} // namespace linux_syscalls
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_IOCTL_H
diff --git a/libc/src/sys/ioctl/linux/CMakeLists.txt b/libc/src/sys/ioctl/linux/CMakeLists.txt
index 876f35aaee66c..33ff2d4dce214 100644
--- a/libc/src/sys/ioctl/linux/CMakeLists.txt
+++ b/libc/src/sys/ioctl/linux/CMakeLists.txt
@@ -6,7 +6,6 @@ add_entrypoint_object(
../ioctl.h
DEPENDS
libc.include.sys_ioctl
- libc.include.sys_syscall
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
diff --git a/libc/src/sys/ioctl/linux/ioctl.cpp b/libc/src/sys/ioctl/linux/ioctl.cpp
index 9bb669c6a6f66..ec861ffc03ec6 100644
--- a/libc/src/sys/ioctl/linux/ioctl.cpp
+++ b/libc/src/sys/ioctl/linux/ioctl.cpp
@@ -8,11 +8,10 @@
#include "src/sys/ioctl/ioctl.h"
-#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/OSUtil/linux/syscall_wrappers/ioctl.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include <stdarg.h>
-#include <sys/syscall.h> // For syscall numbers.
namespace LIBC_NAMESPACE_DECL {
@@ -20,16 +19,14 @@ LLVM_LIBC_FUNCTION(int, ioctl, (int fd, unsigned long request, ...)) {
va_list vargs;
va_start(vargs, request);
void *data_pointer = va_arg(vargs, void *);
- int ret =
- LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, request, data_pointer);
va_end(vargs);
- // Some ioctls can be expected to return positive values
- if (ret >= 0)
- return ret;
+ auto ret = linux_syscalls::ioctl(fd, request, data_pointer);
- // If there is an error, errno is set and -1 is returned.
- libc_errno = -ret;
+ if (ret.has_value())
+ return ret.value();
+
+ libc_errno = ret.error();
return -1;
}
diff --git a/libc/src/termios/linux/CMakeLists.txt b/libc/src/termios/linux/CMakeLists.txt
index e990fba25eabe..5d5440ae69266 100644
--- a/libc/src/termios/linux/CMakeLists.txt
+++ b/libc/src/termios/linux/CMakeLists.txt
@@ -51,9 +51,8 @@ add_entrypoint_object(
HDRS
../tcgetsid.h
DEPENDS
- libc.include.sys_syscall
libc.include.termios
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
@@ -64,9 +63,8 @@ add_entrypoint_object(
HDRS
../tcdrain.h
DEPENDS
- libc.include.sys_syscall
libc.include.termios
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
@@ -77,9 +75,8 @@ add_entrypoint_object(
HDRS
../tcflush.h
DEPENDS
- libc.include.sys_syscall
libc.include.termios
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
@@ -90,9 +87,8 @@ add_entrypoint_object(
HDRS
../tcflow.h
DEPENDS
- libc.include.sys_syscall
libc.include.termios
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
@@ -103,9 +99,8 @@ add_entrypoint_object(
HDRS
../tcsendbreak.h
DEPENDS
- libc.include.sys_syscall
libc.include.termios
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
@@ -123,9 +118,8 @@ add_entrypoint_object(
../tcgetattr.h
DEPENDS
.kernel_termios
- libc.include.sys_syscall
libc.include.termios
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
@@ -137,8 +131,7 @@ add_entrypoint_object(
../tcsetattr.h
DEPENDS
.kernel_termios
- libc.include.sys_syscall
libc.include.termios
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
diff --git a/libc/src/termios/linux/tcdrain.cpp b/libc/src/termios/linux/tcdrain.cpp
index 570b15c24fe7f..4fce89d65a76f 100644
--- a/libc/src/termios/linux/tcdrain.cpp
+++ b/libc/src/termios/linux/tcdrain.cpp
@@ -8,21 +8,20 @@
#include "src/termios/tcdrain.h"
-#include "src/__support/OSUtil/syscall.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.
-#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, tcdrain, (int fd)) {
- int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TCSBRK, 1);
- if (ret < 0) {
- libc_errno = -ret;
+ auto ret = linux_syscalls::ioctl(fd, TCSBRK, 1);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
return -1;
}
return 0;
diff --git a/libc/src/termios/linux/tcflow.cpp b/libc/src/termios/linux/tcflow.cpp
index 714ef6aa71298..4ffd294997ad4 100644
--- a/libc/src/termios/linux/tcflow.cpp
+++ b/libc/src/termios/linux/tcflow.cpp
@@ -8,21 +8,20 @@
#include "src/termios/tcflow.h"
-#include "src/__support/OSUtil/syscall.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.
-#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, tcflow, (int fd, int action)) {
- int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TCXONC, action);
- if (ret < 0) {
- libc_errno = -ret;
+ auto ret = linux_syscalls::ioctl(fd, TCXONC, action);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
return -1;
}
return 0;
diff --git a/libc/src/termios/linux/tcflush.cpp b/libc/src/termios/linux/tcflush.cpp
index 4c7b9fadc446d..8a4676d97454a 100644
--- a/libc/src/termios/linux/tcflush.cpp
+++ b/libc/src/termios/linux/tcflush.cpp
@@ -8,22 +8,20 @@
#include "src/termios/tcflush.h"
-#include "src/__support/OSUtil/syscall.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.
-#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, tcflush, (int fd, int queue_selector)) {
- int ret =
- LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TCFLSH, queue_selector);
- if (ret < 0) {
- libc_errno = -ret;
+ auto ret = linux_syscalls::ioctl(fd, TCFLSH, queue_selector);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
return -1;
}
return 0;
diff --git a/libc/src/termios/linux/tcgetattr.cpp b/libc/src/termios/linux/tcgetattr.cpp
index 2e768269c874d..0569be4ae588f 100644
--- a/libc/src/termios/linux/tcgetattr.cpp
+++ b/libc/src/termios/linux/tcgetattr.cpp
@@ -7,24 +7,22 @@
//===----------------------------------------------------------------------===//
#include "src/termios/tcgetattr.h"
-#include "kernel_termios.h"
-
-#include "src/__support/OSUtil/syscall.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/termios/linux/kernel_termios.h"
#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
-#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, tcgetattr, (int fd, struct termios *t)) {
LIBC_NAMESPACE::kernel_termios kt;
- int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TCGETS, &kt);
- if (ret < 0) {
- libc_errno = -ret;
+ auto ret = linux_syscalls::ioctl(fd, TCGETS, &kt);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
return -1;
}
t->c_iflag = kt.c_iflag;
diff --git a/libc/src/termios/linux/tcgetsid.cpp b/libc/src/termios/linux/tcgetsid.cpp
index 7487816cf2741..f80fd31b65865 100644
--- a/libc/src/termios/linux/tcgetsid.cpp
+++ b/libc/src/termios/linux/tcgetsid.cpp
@@ -8,22 +8,22 @@
#include "src/termios/tcgetsid.h"
-#include "src/__support/OSUtil/syscall.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.
-#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(pid_t, tcgetsid, (int fd)) {
pid_t sid;
- int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TIOCGSID, &sid);
- if (ret < 0) {
- libc_errno = -ret;
+
+ auto ret = linux_syscalls::ioctl(fd, TIOCGSID, &sid);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
return -1;
}
return sid;
diff --git a/libc/src/termios/linux/tcsendbreak.cpp b/libc/src/termios/linux/tcsendbreak.cpp
index 1d546c1d5953e..e91ec7b748582 100644
--- a/libc/src/termios/linux/tcsendbreak.cpp
+++ b/libc/src/termios/linux/tcsendbreak.cpp
@@ -8,13 +8,12 @@
#include "src/termios/tcsendbreak.h"
-#include "src/__support/OSUtil/syscall.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.
-#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
@@ -23,9 +22,9 @@ 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.
- int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TCSBRK, 0);
- if (ret < 0) {
- libc_errno = -ret;
+ auto ret = linux_syscalls::ioctl(fd, TCSBRK, 0);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
return -1;
}
return 0;
diff --git a/libc/src/termios/linux/tcsetattr.cpp b/libc/src/termios/linux/tcsetattr.cpp
index 8a2c7290217ba..b2f08d078ee83 100644
--- a/libc/src/termios/linux/tcsetattr.cpp
+++ b/libc/src/termios/linux/tcsetattr.cpp
@@ -7,15 +7,13 @@
//===----------------------------------------------------------------------===//
#include "src/termios/tcsetattr.h"
-#include "kernel_termios.h"
-
-#include "src/__support/OSUtil/syscall.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/termios/linux/kernel_termios.h"
#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
-#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
@@ -52,9 +50,9 @@ LLVM_LIBC_FUNCTION(int, tcsetattr,
kt.c_cc[i] = 0;
}
- int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, cmd, &kt);
- if (ret < 0) {
- libc_errno = -ret;
+ auto ret = linux_syscalls::ioctl(fd, cmd, &kt);
+ if (!ret.has_value()) {
+ libc_errno = ret.error();
return -1;
}
return 0;
diff --git a/libc/src/unistd/linux/CMakeLists.txt b/libc/src/unistd/linux/CMakeLists.txt
index 04ccde414cd2f..af385e9bbed72 100644
--- a/libc/src/unistd/linux/CMakeLists.txt
+++ b/libc/src/unistd/linux/CMakeLists.txt
@@ -342,11 +342,10 @@ add_entrypoint_object(
HDRS
../isatty.h
DEPENDS
- libc.hdr.fcntl_macros
+ libc.hdr.unistd_macros
libc.include.unistd
libc.include.sys_ioctl
- libc.include.sys_syscall
- libc.src.__support.OSUtil.osutil
+ libc.src.__support.OSUtil.linux.syscall_wrappers.ioctl
libc.src.errno.errno
)
diff --git a/libc/src/unistd/linux/isatty.cpp b/libc/src/unistd/linux/isatty.cpp
index a4d17912b57b0..4418feb2229a3 100644
--- a/libc/src/unistd/linux/isatty.cpp
+++ b/libc/src/unistd/linux/isatty.cpp
@@ -8,13 +8,11 @@
#include "src/unistd/isatty.h"
-#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#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 <sys/ioctl.h> // For ioctl numbers.
-#include <sys/syscall.h> // For syscall numbers.
+#include <sys/ioctl.h> // For ioctl numbers.
namespace LIBC_NAMESPACE_DECL {
@@ -23,12 +21,11 @@ LLVM_LIBC_FUNCTION(int, isatty, (int fd)) {
int line_d_val = INIT_VAL;
// This gets the line dicipline of the terminal. When called on something that
// isn't a terminal it doesn't change line_d_val and returns -1.
- int result =
- LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TIOCGETD, &line_d_val);
- if (result == 0)
+ auto result = linux_syscalls::ioctl(fd, TIOCGETD, &line_d_val);
+ if (result.has_value())
return 1;
- libc_errno = -result;
+ libc_errno = result.error();
return 0;
}
>From 281c9921ffb19b264dfedfb6d8add958e3e538f7 Mon Sep 17 00:00:00 2001
From: Pavel Labath <pavel at labath.sk>
Date: Tue, 23 Jun 2026 10:52:30 +0000
Subject: [PATCH 2/2] Add void*
---
libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h b/libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h
index 9410bbbcad8cd..6c29c2f3f1b17 100644
--- a/libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/ioctl.h
@@ -30,8 +30,12 @@ namespace linux_syscalls {
struct IoctlArg {
unsigned long val;
+ // Some ioctls read the argument, some write to it. The caller is responsible
+ // for passing the correct pointer type.
LIBC_INLINE IoctlArg(const void *ptr)
: val(reinterpret_cast<unsigned long>(ptr)) {}
+ LIBC_INLINE IoctlArg(void *ptr)
+ : val(reinterpret_cast<unsigned long>(ptr)) {}
template <typename T, cpp::enable_if_t<cpp::is_integral_v<T>, int> = 0>
LIBC_INLINE constexpr IoctlArg(T num = 0)
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