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[libc] add ioctl
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13 files changed

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‎libc/config/linux/aarch64/entrypoints.txt

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@@ -245,6 +245,9 @@ set(TARGET_LIBC_ENTRYPOINTS
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# https://github.com/llvm/llvm-project/issues/80060
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# libc.src.sys.epoll.epoll_pwait2
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# sys/ioctl.h entrypoints
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libc.src.sys.ioctl.ioctl
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# sys/mman.h entrypoints
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libc.src.sys.mman.madvise
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libc.src.sys.mman.mincore

‎libc/config/linux/arm/entrypoints.txt

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@@ -172,6 +172,9 @@ set(TARGET_LIBC_ENTRYPOINTS
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libc.src.stdlib.free
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libc.src.stdlib.malloc
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# sys/ioctl.h entrypoints
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libc.src.sys.ioctl.ioctl
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# sys/mman.h entrypoints
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libc.src.sys.mman.mmap
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libc.src.sys.mman.munmap

‎libc/config/linux/riscv/entrypoints.txt

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@@ -246,6 +246,9 @@ set(TARGET_LIBC_ENTRYPOINTS
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# https://github.com/llvm/llvm-project/issues/80060
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# libc.src.sys.epoll.epoll_pwait2
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# sys/ioctl.h entrypoints
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libc.src.sys.ioctl.ioctl
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# sys/mman.h entrypoints
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libc.src.sys.mman.madvise
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libc.src.sys.mman.mincore

‎libc/config/linux/x86_64/entrypoints.txt

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@@ -246,6 +246,9 @@ set(TARGET_LIBC_ENTRYPOINTS
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# https://github.com/llvm/llvm-project/issues/80060
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# libc.src.sys.epoll.epoll_pwait2
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# sys/ioctl.h entrypoints
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libc.src.sys.ioctl.ioctl
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# sys/mman.h entrypoints
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libc.src.sys.mman.madvise
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libc.src.sys.mman.mincore

‎libc/src/sys/CMakeLists.txt

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@@ -13,3 +13,4 @@ add_subdirectory(utsname)
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add_subdirectory(wait)
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add_subdirectory(prctl)
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add_subdirectory(uio)
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add_subdirectory(ioctl)

‎libc/src/sys/ioctl/CMakeLists.txt

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if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
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add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
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endif()
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add_entrypoint_object(
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ioctl
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ALIAS
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DEPENDS
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.${LIBC_TARGET_OS}.ioctl
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)

‎libc/src/sys/ioctl/ioctl.h

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//===-- Implementation header for ioctl ---------------------------*-C++-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_SYS_IOCTL_IOCTL_H
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#define LLVM_LIBC_SRC_SYS_IOCTL_IOCTL_H
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#include "src/__support/macros/config.h"
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#include <sys/ioctl.h>
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namespace LIBC_NAMESPACE_DECL {
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int ioctl(int fd, unsigned long request, ...);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_SYS_IOCTL_IOCTL_H

‎libc/src/sys/ioctl/linux/CMakeLists.txt

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add_entrypoint_object(
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ioctl
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SRCS
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ioctl.cpp
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HDRS
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../ioctl.h
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DEPENDS
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libc.include.sys_ioctl
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libc.include.sys_syscall
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libc.src.__support.OSUtil.osutil
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libc.src.errno.errno
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)

‎libc/src/sys/ioctl/linux/ioctl.cpp

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//===---------- Linux implementation of the ioctl function ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/sys/ioctl/ioctl.h"
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#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
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#include "src/__support/common.h"
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#include "src/errno/libc_errno.h"
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#include <stdarg.h>
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#include <sys/syscall.h> // For syscall numbers.
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namespace LIBC_NAMESPACE_DECL {
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LLVM_LIBC_FUNCTION(int, ioctl, (int fd, unsigned long request, ...)) {
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va_list vargs;
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va_start(vargs, request);
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void *data_pointer = va_arg(vargs, void *);
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int ret =
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LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, request, data_pointer);
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va_end(vargs);
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// From `man ioctl`:
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// "Usually, on success zero is returned. A few ioctl() operations
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// use the return value as an output parameter and return a
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// nonnegative value on success. On error, -1 is returned, and errno
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// is set to indicate the error."
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if (ret < 0) {
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libc_errno = -ret;
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return -1;
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}
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return ret;
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}
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} // namespace LIBC_NAMESPACE_DECL

‎libc/test/src/sys/CMakeLists.txt

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@@ -13,3 +13,4 @@ add_subdirectory(auxv)
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add_subdirectory(epoll)
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add_subdirectory(uio)
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add_subdirectory(time)
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add_subdirectory(ioctl)

‎libc/test/src/sys/ioctl/CMakeLists.txt

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if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
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add_subdirectory(${LIBC_TARGET_OS})
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endif()

‎libc/test/src/sys/ioctl/linux/CMakeLists.txt

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add_custom_target(libc_sys_ioctl_unittests)
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add_libc_unittest(
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ioctl_test
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SUITE
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libc_sys_ioctl_unittests
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SRCS
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ioctl_test.cpp
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DEPENDS
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libc.include.sys_ioctl
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libc.include.sys_filio
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libc.src.sys.ioctl.ioctl
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libc.src.errno.errno
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)

‎libc/test/src/sys/ioctl/linux/ioctl_test.cpp

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//===-- Unittests for ioctl -----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/errno/libc_errno.h"
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#include "src/sys/ioctl/ioctl.h"
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#include "test/UnitTest/ErrnoSetterMatcher.h"
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#include <sys/filio.h>
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#include <sys/ioctl.h>
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using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
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using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
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TEST(LlvmLibcSysIoctlTest, StdinFIONREAD) {
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LIBC_NAMESPACE::libc_errno = 0;
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// FIONREAD reports the number of readable bytes for fd
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int bytes;
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int ret = LIBC_NAMESPACE::ioctl(0, FIONREAD, &bytes);
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ASSERT_ERRNO_SUCCESS();
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}
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TEST(LlvmLibcSysIoctlTest, InvalidCommandENOTTY) {
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LIBC_NAMESPACE::libc_errno = 0;
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// 0xDEADBEEF is just a random nonexistent command;
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// calling this should always fail with ENOTTY
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int ret = LIBC_NAMESPACE::ioctl(3, 0xDEADBEEF, NULL);
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ASSERT_TRUE(ret == -1 && errno == ENOTTY);
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}

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