[libc-commits] [libc] Implement process_vm_readv and process_vm_writev functions (PR #237705)
via libc-commits
libc-commits at lists.llvm.org
Sun Nov 1 02:45:32 PST 2026
llvmorg-github-actions[bot] wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: Mallarapu Ujwal (ujwal-224)
<details>
<summary>Changes</summary>
### Summary
This patch implements the Linux-specific system call wrappers `process_vm_readv` and `process_vm_writev` in `<sys/uio.h>`.
Fixes #<!-- -->236162
### Implementation Details
- **Header Specification**: Updated `libc/include/sys/uio.yaml` to include `linux` standards, the `pid_t` type dependency, and function specifications for `process_vm_readv` and `process_vm_writev`.
- **Syscall Wrappers**: Added centralized syscall wrappers under `libc/src/__support/OSUtil/linux/syscall_wrappers/` using `syscall_checked<ssize_t>` following the project's syscall wrapper guidelines (`libc/docs/dev/syscall_wrapper_refactor.md`).
- **Entrypoints**: Implemented public entrypoints in `libc/src/sys/uio/linux/` with standard `libc_errno` reporting on error.
- **Architecture Support**: Registered the new entrypoints for Linux targets (`x86_64`, `aarch64`, and `riscv`).
- **Testing**: Added unit tests in `libc/test/src/sys/uio/` verifying:
- Positive tests: Self-process memory transfers using `getpid()` across multiple `iovec` chunks.
- Negative tests: Proper `EINVAL` failure when non-zero flags are supplied.
---
Full diff: https://github.com/llvm/llvm-project/pull/237705.diff
17 Files Affected:
- (modified) libc/config/linux/aarch64/entrypoints.txt (+2)
- (modified) libc/config/linux/riscv/entrypoints.txt (+2)
- (modified) libc/config/linux/x86_64/entrypoints.txt (+2)
- (modified) libc/include/CMakeLists.txt (+1)
- (modified) libc/include/sys/uio.yaml (+24)
- (modified) libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt (+28)
- (added) libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_readv.h (+41)
- (added) libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_writev.h (+41)
- (modified) libc/src/sys/uio/CMakeLists.txt (+13)
- (modified) libc/src/sys/uio/linux/CMakeLists.txt (+33)
- (added) libc/src/sys/uio/linux/process_vm_readv.cpp (+39)
- (added) libc/src/sys/uio/linux/process_vm_writev.cpp (+39)
- (added) libc/src/sys/uio/process_vm_readv.h (+25)
- (added) libc/src/sys/uio/process_vm_writev.h (+25)
- (modified) libc/test/src/sys/uio/CMakeLists.txt (+29)
- (added) libc/test/src/sys/uio/process_vm_readv_test.cpp (+48)
- (added) libc/test/src/sys/uio/process_vm_writev_test.cpp (+47)
``````````diff
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index b1163f266f1b62..60b8686ba654e5 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -546,6 +546,8 @@ set(TARGET_LIBC_ENTRYPOINTS
# sys/uio.h entrypoints
libc.src.sys.uio.writev
libc.src.sys.uio.readv
+ libc.src.sys.uio.process_vm_readv
+ libc.src.sys.uio.process_vm_writev
# sys/time.h entrypoints
libc.src.sys.time.setitimer
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 839d4f539b916d..6ddc219ce8caaa 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -603,6 +603,8 @@ set(TARGET_LIBC_ENTRYPOINTS
# sys/uio.h entrypoints
libc.src.sys.uio.writev
libc.src.sys.uio.readv
+ libc.src.sys.uio.process_vm_readv
+ libc.src.sys.uio.process_vm_writev
# sys/time.h entrypoints
libc.src.sys.time.setitimer
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 483a4d371c5a95..4bbe7ea0257663 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -625,6 +625,8 @@ set(TARGET_LIBC_ENTRYPOINTS
# sys/uio.h entrypoints
libc.src.sys.uio.writev
libc.src.sys.uio.readv
+ libc.src.sys.uio.process_vm_readv
+ libc.src.sys.uio.process_vm_writev
# sys/time.h entrypoints
libc.src.sys.time.setitimer
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 0130ba1d72e0e1..4089cdd7bedf7e 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -1089,6 +1089,7 @@ add_header_macro(
.llvm_libc_common_h
.llvm-libc-types.struct_iovec
.llvm-libc-types.ssize_t
+ .llvm-libc-types.pid_t
)
add_header_macro(
diff --git a/libc/include/sys/uio.yaml b/libc/include/sys/uio.yaml
index 929911e6693865..7da273dfbfc335 100644
--- a/libc/include/sys/uio.yaml
+++ b/libc/include/sys/uio.yaml
@@ -1,9 +1,11 @@
header: sys/uio.h
standards:
- posix
+ - linux
types:
- type_name: struct_iovec
- type_name: ssize_t
+ - type_name: pid_t
functions:
- name: writev
standards:
@@ -21,3 +23,25 @@ functions:
- type: int
- type: const struct iovec *
- type: int
+ - name: process_vm_readv
+ standards:
+ - linux
+ return_type: ssize_t
+ arguments:
+ - type: pid_t
+ - type: const struct iovec *
+ - type: unsigned long
+ - type: const struct iovec *
+ - type: unsigned long
+ - type: unsigned long
+ - name: process_vm_writev
+ standards:
+ - linux
+ return_type: ssize_t
+ arguments:
+ - type: pid_t
+ - type: const struct iovec *
+ - type: unsigned long
+ - type: const struct iovec *
+ - type: unsigned long
+ - type: unsigned long
\ No newline at end of file
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
index 8cff89c818baaa..f3b9c4aa427abd 100644
--- a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
@@ -434,7 +434,35 @@ add_header_library(
libc.hdr.types.ssize_t
libc.include.sys_syscall
)
+add_header_library(
+ process_vm_readv
+ HDRS
+ process_vm_readv.h
+ DEPENDS
+ libc.hdr.types.pid_t
+ libc.hdr.types.ssize_t
+ libc.hdr.types.struct_iovec
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.__support.common
+ libc.src.__support.error_or
+ libc.src.__support.macros.config
+)
+add_header_library(
+ process_vm_writev
+ HDRS
+ process_vm_writev.h
+ DEPENDS
+ libc.hdr.types.pid_t
+ libc.hdr.types.ssize_t
+ libc.hdr.types.struct_iovec
+ libc.include.sys_syscall
+ libc.src.__support.OSUtil.osutil
+ libc.src.__support.common
+ libc.src.__support.error_or
+ libc.src.__support.macros.config
+)
add_header_library(
recvfrom
HDRS
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_readv.h b/libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_readv.h
new file mode 100644
index 00000000000000..5602191cb8f022
--- /dev/null
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_readv.h
@@ -0,0 +1,41 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 process_vm_readv.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_PROCESS_VM_READV_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_PROCESS_VM_READV_H
+
+#include "hdr/types/pid_t.h"
+#include "hdr/types/ssize_t.h"
+#include "hdr/types/struct_iovec.h"
+#include "src/__support/OSUtil/linux/syscall.h" // syscall_checked
+#include "src/__support/common.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+
+#include <sys/syscall.h> // For syscall numbers
+
+namespace LIBC_NAMESPACE_DECL {
+namespace linux_syscalls {
+
+LIBC_INLINE ErrorOr<ssize_t>
+process_vm_readv(pid_t pid, const struct iovec *local_iov,
+ unsigned long liovcnt, const struct iovec *remote_iov,
+ unsigned long riovcnt, unsigned long flags) {
+ return syscall_checked<ssize_t>(SYS_process_vm_readv, pid, local_iov, liovcnt,
+ remote_iov, riovcnt, flags);
+}
+
+} // namespace linux_syscalls
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_PROCESS_VM_READV_H
\ No newline at end of file
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_writev.h b/libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_writev.h
new file mode 100644
index 00000000000000..d8d3d7d22d8944
--- /dev/null
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/process_vm_writev.h
@@ -0,0 +1,41 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 process_vm_writev.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_PROCESS_VM_WRITEV_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_PROCESS_VM_WRITEV_H
+
+#include "hdr/types/pid_t.h"
+#include "hdr/types/ssize_t.h"
+#include "hdr/types/struct_iovec.h"
+#include "src/__support/OSUtil/linux/syscall.h" // syscall_checked
+#include "src/__support/common.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+
+#include <sys/syscall.h> // For syscall numbers
+
+namespace LIBC_NAMESPACE_DECL {
+namespace linux_syscalls {
+
+LIBC_INLINE ErrorOr<ssize_t>
+process_vm_writev(pid_t pid, const struct iovec *local_iov,
+ unsigned long liovcnt, const struct iovec *remote_iov,
+ unsigned long riovcnt, unsigned long flags) {
+ return syscall_checked<ssize_t>(SYS_process_vm_writev, pid, local_iov,
+ liovcnt, remote_iov, riovcnt, flags);
+}
+
+} // namespace linux_syscalls
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_PROCESS_VM_WRITEV_H
\ No newline at end of file
diff --git a/libc/src/sys/uio/CMakeLists.txt b/libc/src/sys/uio/CMakeLists.txt
index c6a64297904103..c499350ba9ecfc 100644
--- a/libc/src/sys/uio/CMakeLists.txt
+++ b/libc/src/sys/uio/CMakeLists.txt
@@ -15,3 +15,16 @@ add_entrypoint_object(
DEPENDS
.${LIBC_TARGET_OS}.readv
)
+add_entrypoint_object(
+ process_vm_readv
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.process_vm_readv
+)
+
+add_entrypoint_object(
+ process_vm_writev
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.process_vm_writev
+)
\ No newline at end of file
diff --git a/libc/src/sys/uio/linux/CMakeLists.txt b/libc/src/sys/uio/linux/CMakeLists.txt
index db4fe68e4ca9c5..f1ae8f1ca0c8d5 100644
--- a/libc/src/sys/uio/linux/CMakeLists.txt
+++ b/libc/src/sys/uio/linux/CMakeLists.txt
@@ -27,3 +27,36 @@ add_entrypoint_object(
libc.src.__support.common
libc.src.errno.errno
)
+add_entrypoint_object(
+ process_vm_readv
+ SRCS
+ process_vm_readv.cpp
+ HDRS
+ ../process_vm_readv.h
+ DEPENDS
+ libc.hdr.types.pid_t
+ libc.hdr.types.ssize_t
+ libc.hdr.types.struct_iovec
+ libc.src.__support.OSUtil.linux.syscall_wrappers.process_vm_readv
+ libc.src.__support.common
+ libc.src.__support.libc_errno
+ libc.src.__support.macros.config
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ process_vm_writev
+ SRCS
+ process_vm_writev.cpp
+ HDRS
+ ../process_vm_writev.h
+ DEPENDS
+ libc.hdr.types.pid_t
+ libc.hdr.types.ssize_t
+ libc.hdr.types.struct_iovec
+ libc.src.__support.OSUtil.linux.syscall_wrappers.process_vm_writev
+ libc.src.__support.common
+ libc.src.__support.libc_errno
+ libc.src.__support.macros.config
+ libc.src.errno.errno
+)
\ No newline at end of file
diff --git a/libc/src/sys/uio/linux/process_vm_readv.cpp b/libc/src/sys/uio/linux/process_vm_readv.cpp
new file mode 100644
index 00000000000000..b237c6abe57159
--- /dev/null
+++ b/libc/src/sys/uio/linux/process_vm_readv.cpp
@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 process_vm_readv.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/uio/process_vm_readv.h"
+
+#include "hdr/types/pid_t.h"
+#include "hdr/types/ssize_t.h"
+#include "hdr/types/struct_iovec.h"
+#include "src/__support/OSUtil/linux/syscall_wrappers/process_vm_readv.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(ssize_t, process_vm_readv,
+ (pid_t pid, const struct iovec *local_iov,
+ unsigned long liovcnt, const struct iovec *remote_iov,
+ unsigned long riovcnt, unsigned long flags)) {
+ ErrorOr<ssize_t> ret = linux_syscalls::process_vm_readv(
+ pid, local_iov, liovcnt, remote_iov, riovcnt, flags);
+ if (!ret) {
+ libc_errno = ret.error();
+ return -1;
+ }
+ return ret.value();
+}
+
+} // namespace LIBC_NAMESPACE_DECL
\ No newline at end of file
diff --git a/libc/src/sys/uio/linux/process_vm_writev.cpp b/libc/src/sys/uio/linux/process_vm_writev.cpp
new file mode 100644
index 00000000000000..bc772e39764074
--- /dev/null
+++ b/libc/src/sys/uio/linux/process_vm_writev.cpp
@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 process_vm_writev.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/uio/process_vm_writev.h"
+
+#include "hdr/types/pid_t.h"
+#include "hdr/types/ssize_t.h"
+#include "hdr/types/struct_iovec.h"
+#include "src/__support/OSUtil/linux/syscall_wrappers/process_vm_writev.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(ssize_t, process_vm_writev,
+ (pid_t pid, const struct iovec *local_iov,
+ unsigned long liovcnt, const struct iovec *remote_iov,
+ unsigned long riovcnt, unsigned long flags)) {
+ ErrorOr<ssize_t> ret = linux_syscalls::process_vm_writev(
+ pid, local_iov, liovcnt, remote_iov, riovcnt, flags);
+ if (!ret) {
+ libc_errno = ret.error();
+ return -1;
+ }
+ return ret.value();
+}
+
+} // namespace LIBC_NAMESPACE_DECL
\ No newline at end of file
diff --git a/libc/src/sys/uio/process_vm_readv.h b/libc/src/sys/uio/process_vm_readv.h
new file mode 100644
index 00000000000000..9d80aede3f0c90
--- /dev/null
+++ b/libc/src/sys/uio/process_vm_readv.h
@@ -0,0 +1,25 @@
+//===-- Implementation header for process_vm_readv ------------------------===//
+//
+// 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_UIO_PROCESS_VM_READV_H
+#define LLVM_LIBC_SRC_SYS_UIO_PROCESS_VM_READV_H
+
+#include "hdr/types/pid_t.h"
+#include "hdr/types/ssize_t.h"
+#include "hdr/types/struct_iovec.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+ssize_t process_vm_readv(pid_t pid, const struct iovec *local_iov,
+ unsigned long liovcnt, const struct iovec *remote_iov,
+ unsigned long riovcnt, unsigned long flags);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_SYS_UIO_PROCESS_VM_READV_H
\ No newline at end of file
diff --git a/libc/src/sys/uio/process_vm_writev.h b/libc/src/sys/uio/process_vm_writev.h
new file mode 100644
index 00000000000000..a2d18ec4494a7b
--- /dev/null
+++ b/libc/src/sys/uio/process_vm_writev.h
@@ -0,0 +1,25 @@
+//===-- Implementation header for process_vm_writev -----------------------===//
+//
+// 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_UIO_PROCESS_VM_WRITEV_H
+#define LLVM_LIBC_SRC_SYS_UIO_PROCESS_VM_WRITEV_H
+
+#include "hdr/types/pid_t.h"
+#include "hdr/types/ssize_t.h"
+#include "hdr/types/struct_iovec.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+ssize_t process_vm_writev(pid_t pid, const struct iovec *local_iov,
+ unsigned long liovcnt, const struct iovec *remote_iov,
+ unsigned long riovcnt, unsigned long flags);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_SYS_UIO_PROCESS_VM_WRITEV_H
\ No newline at end of file
diff --git a/libc/test/src/sys/uio/CMakeLists.txt b/libc/test/src/sys/uio/CMakeLists.txt
index 0350cf79d7998b..b9c9984040a308 100644
--- a/libc/test/src/sys/uio/CMakeLists.txt
+++ b/libc/test/src/sys/uio/CMakeLists.txt
@@ -33,3 +33,32 @@ add_libc_test(
libc.src.unistd.write
libc.test.UnitTest.ErrnoSetterMatcher
)
+add_libc_test(
+ process_vm_readv_test
+ SUITE
+ libc-sys-uio-tests
+ SRCS
+ process_vm_readv_test.cpp
+ DEPENDS
+ libc.hdr.types.struct_iovec
+ libc.src.__support.common
+ libc.src.errno.errno
+ libc.src.sys.uio.process_vm_readv
+ libc.src.unistd.getpid
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
+
+add_libc_test(
+ process_vm_writev_test
+ SUITE
+ libc-sys-uio-tests
+ SRCS
+ process_vm_writev_test.cpp
+ DEPENDS
+ libc.hdr.types.struct_iovec
+ libc.src.__support.common
+ libc.src.errno.errno
+ libc.src.sys.uio.process_vm_writev
+ libc.src.unistd.getpid
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
\ No newline at end of file
diff --git a/libc/test/src/sys/uio/process_vm_readv_test.cpp b/libc/test/src/sys/uio/process_vm_readv_test.cpp
new file mode 100644
index 00000000000000..dde2fa1bbbb438
--- /dev/null
+++ b/libc/test/src/sys/uio/process_vm_readv_test.cpp
@@ -0,0 +1,48 @@
+//===-- Unittests for process_vm_readv ------------------------------------===//
+//
+// 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 "hdr/types/struct_iovec.h"
+#include "src/sys/uio/process_vm_readv.h"
+#include "src/unistd/getpid.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+
+TEST(LlvmLibcSysUioProcessVmReadvTest, SmokeTest) {
+ pid_t pid = LIBC_NAMESPACE::getpid();
+ char src[] = "Hello, World!\n";
+
+ struct iovec remote_iov[1];
+ remote_iov[0].iov_base = src;
+ remote_iov[0].iov_len = sizeof(src);
+
+ char buf0[7];
+ char buf1[8];
+ struct iovec local_iov[2];
+ local_iov[0].iov_base = buf0;
+ local_iov[0].iov_len = 7;
+ local_iov[1].iov_base = buf1;
+ local_iov[1].iov_len = sizeof(src) - 7;
+
+ ASSERT_THAT(
+ LIBC_NAMESPACE::process_vm_readv(pid, local_iov, 2, remote_iov, 1, 0),
+ returns(EQ(ssize_t(sizeof(src)))).with_errno(EQ(0)));
+
+ EXPECT_EQ(buf0[0], 'H');
+ EXPECT_EQ(buf0[6], ' ');
+ EXPECT_EQ(buf1[0], 'W');
+}
+
+TEST(LlvmLibcSysUioProcessVmReadvTest, InvalidFlags) {
+ pid_t pid = LIBC_NAMESPACE::getpid();
+ char buf[8];
+ struct iovec iov = {buf, sizeof(buf)};
+ ASSERT_THAT(LIBC_NAMESPACE::process_vm_readv(pid, &iov, 1, &iov, 1, 1),
+ returns(EQ(ssize_t(-1))).with_errno(EQ(EINVAL)));
+}
\ No newline at end of file
diff --git a/libc/test/src/sys/uio/process_vm_writev_test.cpp b/libc/test/src/sys/uio/process_vm_writev_test.cpp
new file mode 100644
index 00000000000000..ce0f5275387ce2
--- /dev/null
+++ b/libc/test/src/sys/uio/process_vm_writev_test.cpp
@@ -0,0 +1,47 @@
+//===-- Unittests for process_vm_writev -----------------------------------===//
+//
+// 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 "hdr/types/struct_iovec.h"
+#include "src/sys/uio/process_vm_writev.h"
+#include "src/unistd/getpid.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+
+TEST(LlvmLibcSysUioProcessVmWritevTest, SmokeTest) {
+ pid_t pid = LIBC_NAMESPACE::getpid();
+ char dest[15] = {};
+
+ struct iovec remote_iov[1];
+ remote_iov[0].iov_base = dest;
+ remote_iov[0].iov_len = sizeof(dest);
+
+ char part0[] = "Hello, ";
+ char part1[] = "World!\n";
+ struct iovec local_iov[2];
+ local_iov[0].iov_base = part0;
+ local_iov[0].iov_len = 7;
+ local_iov[1].iov_base = part1;
+ local_iov[1].iov_len = 8; // includes '\n' and '\0'
+
+ ASSERT_THAT(
+ LIBC_NAMESPACE::process_vm_writev(pid, local_iov, 2, remote_iov, 1, 0),
+ returns(EQ(ssize_t(15))).with_errno(EQ(0)));
+
+ EXPECT_EQ(dest[0], 'H');
+ EXPECT_EQ(dest[7], 'W');
+}
+
+TEST(LlvmLibcSysUioProcessVmWritevTest, InvalidFlags) {
+ pid_t pid = LIBC_NAMESPACE::getpid();
+ char buf[8];
+ struct iovec iov = {buf, sizeof(buf)};
+ ASSERT_THAT(LIBC_NAMESPACE::process_vm_writev(pid, &iov, 1, &iov, 1, 1),
+ returns(EQ(ssize_t(-1))).with_errno(EQ(EINVAL)));
+}
\ No newline at end of file
``````````
</details>
https://github.com/llvm/llvm-project/pull/237705
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