[libc] Implement process_mrelease #117851
Open
+188
−1
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
@llvm/pr-subscribers-libc Author: Omar Hossam (moar55) ChangesThis PR implements process_mrelease. Full diff: https://github.com/llvm/llvm-project/pull/117851.diff 12 Files Affected:
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 74ca3742977a5f..08b5072499da69 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -252,6 +252,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.mman.munlockall
libc.src.sys.mman.munmap
libc.src.sys.mman.remap_file_pages
+ libc.src.sys.mman.process_mrelease
libc.src.sys.mman.posix_madvise
libc.src.sys.mman.shm_open
libc.src.sys.mman.shm_unlink
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 5419462d4f5b3b..4ea65f76d7948d 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -251,6 +251,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.mman.munmap
libc.src.sys.mman.remap_file_pages
libc.src.sys.mman.posix_madvise
+ libc.src.sys.mman.process_mrelease
libc.src.sys.mman.shm_open
libc.src.sys.mman.shm_unlink
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 957e28bd66cc4c..d0651c06b930ad 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -252,6 +252,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.mman.munmap
libc.src.sys.mman.remap_file_pages
libc.src.sys.mman.posix_madvise
+ libc.src.sys.mman.process_mrelease
libc.src.sys.mman.shm_open
libc.src.sys.mman.shm_unlink
diff --git a/libc/include/sys/syscall.h.def b/libc/include/sys/syscall.h.def
index 03c19eb0885ed6..11758ea8336ddf 100644
--- a/libc/include/sys/syscall.h.def
+++ b/libc/include/sys/syscall.h.def
@@ -2349,5 +2349,12 @@
#define SYS_writev __NR_writev
#endif
+#ifdef __NR_process_mrelease
+#define SYS_process_mrelease __NR_process_mrelease
+#endif
+
+#ifdef __NR_pidfd_open
+#define SYS_pidfd_open __NR_pidfd_open
+#endif
#endif // LLVM_LIBC_SYS_SYSCALL_H
diff --git a/libc/newhdrgen/yaml/sys/mman.yaml b/libc/newhdrgen/yaml/sys/mman.yaml
index 962ca3591917f7..dd53eb60d1ec57 100644
--- a/libc/newhdrgen/yaml/sys/mman.yaml
+++ b/libc/newhdrgen/yaml/sys/mman.yaml
@@ -132,3 +132,10 @@ functions:
return_type: int
arguments:
- type: const char *
+ - name: process_mrelease
+ standards:
+ - Linux
+ return_type: int
+ arguments:
+ - type: int
+ - type: unsigned int
diff --git a/libc/spec/linux.td b/libc/spec/linux.td
index 9b5dc8e30c95e4..99e0949a592dfa 100644
--- a/libc/spec/linux.td
+++ b/libc/spec/linux.td
@@ -112,6 +112,12 @@ def Linux : StandardSpec<"Linux"> {
ArgSpec<IntType>,
ArgSpec<SizeTType>,
ArgSpec<IntType>,
+ FunctionSpec<
+ "process_mrelease",
+ RetValSpec<IntType>,
+ [
+ ArgSpec<IntType>,
+ ArgSpec<UnsignedIntType>
]
>,
FunctionSpec<
diff --git a/libc/src/sys/mman/CMakeLists.txt b/libc/src/sys/mman/CMakeLists.txt
index 4d4c2ad376050e..281efc0ffcdf20 100644
--- a/libc/src/sys/mman/CMakeLists.txt
+++ b/libc/src/sys/mman/CMakeLists.txt
@@ -113,3 +113,9 @@ add_entrypoint_object(
DEPENDS
.${LIBC_TARGET_OS}.mremap
)
+
+add_entrypoint_object(
+ process_mrelease
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.process_mrelease)
diff --git a/libc/src/sys/mman/linux/CMakeLists.txt b/libc/src/sys/mman/linux/CMakeLists.txt
index 89a0ad1527a065..aa2ca4b160181a 100644
--- a/libc/src/sys/mman/linux/CMakeLists.txt
+++ b/libc/src/sys/mman/linux/CMakeLists.txt
@@ -36,7 +36,6 @@ add_entrypoint_object(
libc.src.__support.OSUtil.osutil
libc.src.errno.errno
)
-
add_entrypoint_object(
munmap
SRCS
@@ -214,3 +213,14 @@ add_entrypoint_object(
libc.src.unistd.unlink
.shm_common
)
+
+add_entrypoint_object(
+ process_mrelease
+ SRCS
+ process_mrelease.cpp
+ HDRS
+ ../process_mrelease.h
+ DEPENDS
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.errno.errno)
diff --git a/libc/src/sys/mman/linux/process_mrelease.cpp b/libc/src/sys/mman/linux/process_mrelease.cpp
new file mode 100644
index 00000000000000..e86bbec1b1b661
--- /dev/null
+++ b/libc/src/sys/mman/linux/process_mrelease.cpp
@@ -0,0 +1,33 @@
+//===---------- Linux implementation of the mrelease function -----------===//
+//
+// 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/sys/mman/process_mrelease.h"
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+
+#include "src/__support/macros/config.h"
+#include "src/errno/libc_errno.h"
+#include <linux/param.h> // For EXEC_PAGESIZE.
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, process_mrelease, (int pidfd, unsigned int flags)) {
+ long ret =
+ LIBC_NAMESPACE::syscall_impl<int>(SYS_process_mrelease, pidfd, flags);
+
+ if (ret < 0) {
+ libc_errno = static_cast<int>(-ret);
+ return -1;
+ }
+
+ return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/sys/mman/process_mrelease.h b/libc/src/sys/mman/process_mrelease.h
new file mode 100644
index 00000000000000..ec4a6e4768bcac
--- /dev/null
+++ b/libc/src/sys/mman/process_mrelease.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for process_mrelease function --------*- 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_SYS_MMAN_PROCESS_MRELEASE_H
+#define LLVM_LIBC_SRC_SYS_MMAN_PROCESS_MRELEASE_H
+
+#include "src/__support/macros/config.h"
+#include <sys/mman.h> // For size_t and off_t
+
+namespace LIBC_NAMESPACE_DECL {
+
+int process_mrelease(int pidfd, unsigned int flags);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_SYS_MMAN_PROCESS_MRELEASE_H
diff --git a/libc/test/src/sys/mman/linux/CMakeLists.txt b/libc/test/src/sys/mman/linux/CMakeLists.txt
index 44ed11aadfe8b7..6021ccd8c89a82 100644
--- a/libc/test/src/sys/mman/linux/CMakeLists.txt
+++ b/libc/test/src/sys/mman/linux/CMakeLists.txt
@@ -181,3 +181,23 @@ add_libc_unittest(
libc.hdr.fcntl_macros
libc.test.UnitTest.ErrnoSetterMatcher
)
+
+add_libc_unittest(
+ process_mrelease_test
+ SUITE
+ libc_sys_mman_unittests
+ SRCS
+ process_mrelease_test.cpp
+ DEPENDS
+ libc.include.sys_mman
+ libc.include.sys_syscall
+ libc.src.errno.errno
+ libc.src.sys.mman.process_mrelease
+ libc.src.unistd.close
+ libc.src.signal.kill
+ libc.include.signal
+ libc.src.stdlib.exit
+ libc.src.__support.OSUtil.osutil
+ libc.src.__support.threads.sleep
+ libc.test.UnitTest.ErrnoSetterMatcher
+ )
diff --git a/libc/test/src/sys/mman/linux/process_mrelease_test.cpp b/libc/test/src/sys/mman/linux/process_mrelease_test.cpp
new file mode 100644
index 00000000000000..1c3c549aa9bebd
--- /dev/null
+++ b/libc/test/src/sys/mman/linux/process_mrelease_test.cpp
@@ -0,0 +1,74 @@
+//===-- Unittests for process_mrelease ------------------------------------===//
+//
+// 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/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/threads/sleep.h"
+#include "src/errno/libc_errno.h"
+#include "src/signal/kill.h"
+#include "src/stdlib/exit.h"
+#include "src/sys/mman/process_mrelease.h"
+#include "src/unistd/close.h"
+#include "src/unistd/fork.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/LibcTest.h"
+
+#include <sys/syscall.h>
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+
+int pidfd_open(pid_t pid, unsigned int flags) {
+ return LIBC_NAMESPACE::syscall_impl(SYS_pidfd_open, pid, flags);
+}
+
+TEST(LlvmLibcMProcessMReleaseTest, NoError) {
+ pid_t child_pid = fork();
+ EXPECT_GE(child_pid, 0);
+
+ if (child_pid == 0) {
+ // Child process: wait a bit then exit gracefully.
+ LIBC_NAMESPACE::sleep_briefly();
+ LIBC_NAMESPACE::exit(0);
+ } else {
+ // Parent process: wait a bit and then kill the child.
+ // Give child process some time to start.
+ LIBC_NAMESPACE::sleep_briefly();
+ int pidfd = pidfd_open(child_pid, 0);
+ EXPECT_GE(pidfd, 0);
+
+ // Send SIGKILL to child process
+ LIBC_NAMESPACE::kill(child_pid, SIGKILL);
+
+ EXPECT_THAT(LIBC_NAMESPACE::process_mrelease(pidfd, 0), Succeeds());
+
+ LIBC_NAMESPACE::close(pidfd);
+ }
+}
+
+TEST(LlvmLibcMProcessMReleaseTest, ErrorNotKilled) {
+ pid_t child_pid = fork();
+ EXPECT_GE(child_pid, 0);
+
+ if (child_pid == 0) {
+ // Child process: wait a bit then exit gracefully.
+ LIBC_NAMESPACE::sleep_briefly();
+ LIBC_NAMESPACE::exit(0);
+ } else {
+ // Give child process some time to start.
+ LIBC_NAMESPACE::sleep_briefly();
+ int pidfd = pidfd_open(child_pid, 0);
+ EXPECT_GE(pidfd, 0);
+
+ EXPECT_THAT(LIBC_NAMESPACE::process_mrelease(pidfd, 0), Fails(EINVAL));
+
+ LIBC_NAMESPACE::close(pidfd);
+ }
+}
+
+TEST(LlvmLibcMProcessMReleaseTest, ErrorNonExistingPidfd) {
+ EXPECT_THAT(LIBC_NAMESPACE::process_mrelease(-1, 0), Fails(EBADF));
+}
|
|
@SchrodingerZhu hey can you re-review this :) |
You can test this locally with the following command:git-clang-format --diff b0bdbf4288a664179024eead871a5e7b7fae6dda f3a87b4246bf6578794b95253efee96932a5f447 --extensions h,cpp -- libc/src/sys/mman/linux/process_mrelease.cpp libc/src/sys/mman/process_mrelease.h libc/test/src/sys/mman/linux/process_mrelease_test.cppView the diff from clang-format here.diff --git a/libc/src/sys/mman/process_mrelease.h b/libc/src/sys/mman/process_mrelease.h
index ec4a6e4768..45c896eb13 100644
--- a/libc/src/sys/mman/process_mrelease.h
+++ b/libc/src/sys/mman/process_mrelease.h
@@ -1,4 +1,5 @@
-//===-- Implementation header for process_mrelease function --------*- C++ -*-===//
+//===-- Implementation header for process_mrelease function --------*- C++
+//-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
|
That doesn't look like the right format 🤔 |
|
@moar55 it should be the case that the header is too long. You can shrink the license header by removing some |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This PR implements process_mrelease.
A previous PR was merged #117503, but failed on merge due to an issue in the tests. Namely the failing tests were comparing against return type as opposed to errno. This is fixed in this PR.