[libc-commits] [libc] [libc] Implement seteuid and setegid in unistd (PR #233088)
Aman Maurya via libc-commits
libc-commits at lists.llvm.org
Sat Oct 17 07:04:33 PDT 2026
https://github.com/amanmaurya92 created https://github.com/llvm/llvm-project/pull/233088
Implement the standard POSIX functions `seteuid` and `setegid` in `<unistd.h>`.
Fixes #232380.
Assisted by Antigravity and reviewed by Aman Maurya.
>From cb91cc2c1999c179bc36615c3ca81ab0daad17b7 Mon Sep 17 00:00:00 2001
From: amanmaurya92 <amanmaurya9209 at gmail.com>
Date: Sat, 17 Oct 2026 17:33:19 +0530
Subject: [PATCH] [libc] Implement seteuid and setegid in unistd
Implement the standard POSIX functions seteuid and setegid in <unistd.h>.
- Add syscall wrappers for setresuid and setresgid on Linux.
- Implement seteuid and setegid via setresuid(-1, uid, -1) and setresgid(-1, gid, -1).
- Declare entrypoints in unistd.yaml and register them across Linux target entrypoints.
- Add unit tests covering current EUID/UID/EGID/GID and unprivileged invalid ID behavior.
Fixes #232380.
---
libc/config/linux/aarch64/entrypoints.txt | 2 +
libc/config/linux/arm/entrypoints.txt | 2 +
libc/config/linux/riscv/entrypoints.txt | 2 +
libc/config/linux/x86_64/entrypoints.txt | 2 +
libc/include/unistd.yaml | 12 ++++++
.../linux/syscall_wrappers/CMakeLists.txt | 26 ++++++++++++
.../OSUtil/linux/syscall_wrappers/setresgid.h | 40 +++++++++++++++++++
.../OSUtil/linux/syscall_wrappers/setresuid.h | 40 +++++++++++++++++++
libc/src/unistd/CMakeLists.txt | 14 +++++++
libc/src/unistd/linux/CMakeLists.txt | 24 +++++++++++
libc/src/unistd/linux/setegid.cpp | 34 ++++++++++++++++
libc/src/unistd/linux/seteuid.cpp | 34 ++++++++++++++++
libc/src/unistd/setegid.h | 26 ++++++++++++
libc/src/unistd/seteuid.h | 26 ++++++++++++
libc/test/src/unistd/CMakeLists.txt | 30 ++++++++++++++
libc/test/src/unistd/setegid_test.cpp | 40 +++++++++++++++++++
libc/test/src/unistd/seteuid_test.cpp | 40 +++++++++++++++++++
17 files changed, 394 insertions(+)
create mode 100644 libc/src/__support/OSUtil/linux/syscall_wrappers/setresgid.h
create mode 100644 libc/src/__support/OSUtil/linux/syscall_wrappers/setresuid.h
create mode 100644 libc/src/unistd/linux/setegid.cpp
create mode 100644 libc/src/unistd/linux/seteuid.cpp
create mode 100644 libc/src/unistd/setegid.h
create mode 100644 libc/src/unistd/seteuid.h
create mode 100644 libc/test/src/unistd/setegid_test.cpp
create mode 100644 libc/test/src/unistd/seteuid_test.cpp
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index b2c8d62a65f4e1..aeab09a2dae101 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -501,6 +501,8 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.readlink
libc.src.unistd.readlinkat
libc.src.unistd.rmdir
+ libc.src.unistd.setegid
+ libc.src.unistd.seteuid
libc.src.unistd.setgid
libc.src.unistd.setpgid
libc.src.unistd.setregid
diff --git a/libc/config/linux/arm/entrypoints.txt b/libc/config/linux/arm/entrypoints.txt
index 023d298170c245..28979790164f11 100644
--- a/libc/config/linux/arm/entrypoints.txt
+++ b/libc/config/linux/arm/entrypoints.txt
@@ -294,6 +294,8 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.readlink
libc.src.unistd.readlinkat
libc.src.unistd.rmdir
+ libc.src.unistd.setegid
+ libc.src.unistd.seteuid
libc.src.unistd.setgid
libc.src.unistd.setpgid
libc.src.unistd.setregid
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 3bdc686c0e4ce4..5842a405a599c2 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -521,6 +521,8 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.readlink
libc.src.unistd.readlinkat
libc.src.unistd.rmdir
+ libc.src.unistd.setegid
+ libc.src.unistd.seteuid
libc.src.unistd.setgid
libc.src.unistd.setpgid
libc.src.unistd.setregid
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 23a588f65d7435..90bd0ac5aef553 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -541,6 +541,8 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.unistd.readlink
libc.src.unistd.readlinkat
libc.src.unistd.rmdir
+ libc.src.unistd.setegid
+ libc.src.unistd.seteuid
libc.src.unistd.setgid
libc.src.unistd.setpgid
libc.src.unistd.setregid
diff --git a/libc/include/unistd.yaml b/libc/include/unistd.yaml
index 5964e35b6ce5d2..1e4b04590f2c77 100644
--- a/libc/include/unistd.yaml
+++ b/libc/include/unistd.yaml
@@ -543,6 +543,18 @@ functions:
- type: const void *__restrict
- type: void *
- type: ssize_t
+ - name: setegid
+ standards:
+ - posix
+ return_type: int
+ arguments:
+ - type: gid_t
+ - name: seteuid
+ standards:
+ - posix
+ return_type: int
+ arguments:
+ - type: uid_t
- name: setgid
standards:
- posix
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
index 3f2ed1852acee2..ed265cda2ee3f7 100644
--- a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
@@ -923,6 +923,32 @@ add_header_library(
libc.src.__support.OSUtil.osutil
)
+add_header_library(
+ setresgid
+ HDRS
+ setresgid.h
+ DEPENDS
+ libc.hdr.types.gid_t
+ libc.include.sys_syscall
+ libc.src.__support.common
+ libc.src.__support.error_or
+ libc.src.__support.macros.config
+ libc.src.__support.OSUtil.osutil
+)
+
+add_header_library(
+ setresuid
+ HDRS
+ setresuid.h
+ DEPENDS
+ libc.hdr.types.uid_t
+ libc.include.sys_syscall
+ libc.src.__support.common
+ libc.src.__support.error_or
+ libc.src.__support.macros.config
+ libc.src.__support.OSUtil.osutil
+)
+
add_header_library(
setreuid
HDRS
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/setresgid.h b/libc/src/__support/OSUtil/linux/syscall_wrappers/setresgid.h
new file mode 100644
index 00000000000000..df68ca97d78e56
--- /dev/null
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/setresgid.h
@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 setresgid.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_SETRESGID_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_SETRESGID_H
+
+#include "hdr/types/gid_t.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<int> setresgid(gid_t rgid, gid_t egid, gid_t sgid) {
+#if defined(SYS_setresgid32)
+ return syscall_checked<int>(SYS_setresgid32, rgid, egid, sgid);
+#elif defined(SYS_setresgid)
+ return syscall_checked<int>(SYS_setresgid, rgid, egid, sgid);
+#else
+#error "SYS_setresgid and SYS_setresgid32 syscalls not available."
+#endif
+}
+
+} // namespace linux_syscalls
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_SETRESGID_H
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/setresuid.h b/libc/src/__support/OSUtil/linux/syscall_wrappers/setresuid.h
new file mode 100644
index 00000000000000..4574e9a28a6f67
--- /dev/null
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/setresuid.h
@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 setresuid.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_SETRESUID_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_SETRESUID_H
+
+#include "hdr/types/uid_t.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<int> setresuid(uid_t ruid, uid_t euid, uid_t suid) {
+#if defined(SYS_setresuid32)
+ return syscall_checked<int>(SYS_setresuid32, ruid, euid, suid);
+#elif defined(SYS_setresuid)
+ return syscall_checked<int>(SYS_setresuid, ruid, euid, suid);
+#else
+#error "SYS_setresuid and SYS_setresuid32 syscalls not available."
+#endif
+}
+
+} // namespace linux_syscalls
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_SYSCALL_WRAPPERS_SETRESUID_H
diff --git a/libc/src/unistd/CMakeLists.txt b/libc/src/unistd/CMakeLists.txt
index 27b74b8ca2de3c..e50705a2cb1adc 100644
--- a/libc/src/unistd/CMakeLists.txt
+++ b/libc/src/unistd/CMakeLists.txt
@@ -399,6 +399,20 @@ add_entrypoint_object(
.${LIBC_TARGET_OS}.rmdir
)
+add_entrypoint_object(
+ setegid
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.setegid
+)
+
+add_entrypoint_object(
+ seteuid
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.seteuid
+)
+
add_entrypoint_object(
setgid
ALIAS
diff --git a/libc/src/unistd/linux/CMakeLists.txt b/libc/src/unistd/linux/CMakeLists.txt
index 61030ec7e12283..e71304a05cbd49 100644
--- a/libc/src/unistd/linux/CMakeLists.txt
+++ b/libc/src/unistd/linux/CMakeLists.txt
@@ -718,6 +718,30 @@ add_entrypoint_object(
libc.src.errno.errno
)
+add_entrypoint_object(
+ setegid
+ SRCS
+ setegid.cpp
+ HDRS
+ ../setegid.h
+ DEPENDS
+ libc.hdr.types.gid_t
+ libc.src.__support.OSUtil.linux.syscall_wrappers.setresgid
+ libc.src.errno.errno
+)
+
+add_entrypoint_object(
+ seteuid
+ SRCS
+ seteuid.cpp
+ HDRS
+ ../seteuid.h
+ DEPENDS
+ libc.hdr.types.uid_t
+ libc.src.__support.OSUtil.linux.syscall_wrappers.setresuid
+ libc.src.errno.errno
+)
+
add_entrypoint_object(
setgid
SRCS
diff --git a/libc/src/unistd/linux/setegid.cpp b/libc/src/unistd/linux/setegid.cpp
new file mode 100644
index 00000000000000..05c9c15c120e08
--- /dev/null
+++ b/libc/src/unistd/linux/setegid.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 setegid.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/unistd/setegid.h"
+
+#include "hdr/types/gid_t.h"
+#include "src/__support/OSUtil/linux/syscall_wrappers/setresgid.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(int, setegid, (gid_t gid)) {
+ auto ret = linux_syscalls::setresgid(static_cast<gid_t>(-1), gid,
+ static_cast<gid_t>(-1));
+ if (!ret) {
+ libc_errno = ret.error();
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/unistd/linux/seteuid.cpp b/libc/src/unistd/linux/seteuid.cpp
new file mode 100644
index 00000000000000..9be20d34fea466
--- /dev/null
+++ b/libc/src/unistd/linux/seteuid.cpp
@@ -0,0 +1,34 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 seteuid.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/unistd/seteuid.h"
+
+#include "hdr/types/uid_t.h"
+#include "src/__support/OSUtil/linux/syscall_wrappers/setresuid.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(int, seteuid, (uid_t uid)) {
+ auto ret = linux_syscalls::setresuid(static_cast<uid_t>(-1), uid,
+ static_cast<uid_t>(-1));
+ if (!ret) {
+ libc_errno = ret.error();
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/unistd/setegid.h b/libc/src/unistd/setegid.h
new file mode 100644
index 00000000000000..814e0d15b6c98d
--- /dev/null
+++ b/libc/src/unistd/setegid.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
+/// Implementation header for setegid.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_UNISTD_SETEGID_H
+#define LLVM_LIBC_SRC_UNISTD_SETEGID_H
+
+#include "hdr/types/gid_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int setegid(gid_t gid);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_UNISTD_SETEGID_H
diff --git a/libc/src/unistd/seteuid.h b/libc/src/unistd/seteuid.h
new file mode 100644
index 00000000000000..efcae1f180f557
--- /dev/null
+++ b/libc/src/unistd/seteuid.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
+/// Implementation header for seteuid.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_UNISTD_SETEUID_H
+#define LLVM_LIBC_SRC_UNISTD_SETEUID_H
+
+#include "hdr/types/uid_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int seteuid(uid_t uid);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_UNISTD_SETEUID_H
diff --git a/libc/test/src/unistd/CMakeLists.txt b/libc/test/src/unistd/CMakeLists.txt
index 2e8d9bb8e2509f..08e42e3fe4c643 100644
--- a/libc/test/src/unistd/CMakeLists.txt
+++ b/libc/test/src/unistd/CMakeLists.txt
@@ -497,6 +497,36 @@ add_libc_test(
libc.test.UnitTest.ErrnoSetterMatcher
)
+add_libc_test(
+ setegid_test
+ SUITE
+ libc_unistd_unittests
+ SRCS
+ setegid_test.cpp
+ DEPENDS
+ libc.hdr.errno_macros
+ libc.src.unistd.getegid
+ libc.src.unistd.getgid
+ libc.src.unistd.setegid
+ libc.test.UnitTest.ErrnoCheckingTest
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
+
+add_libc_test(
+ seteuid_test
+ SUITE
+ libc_unistd_unittests
+ SRCS
+ seteuid_test.cpp
+ DEPENDS
+ libc.hdr.errno_macros
+ libc.src.unistd.geteuid
+ libc.src.unistd.getuid
+ libc.src.unistd.seteuid
+ libc.test.UnitTest.ErrnoCheckingTest
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
+
add_libc_test(
setgid_test
SUITE
diff --git a/libc/test/src/unistd/setegid_test.cpp b/libc/test/src/unistd/setegid_test.cpp
new file mode 100644
index 00000000000000..3f1cb78d5a8a37
--- /dev/null
+++ b/libc/test/src/unistd/setegid_test.cpp
@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Unittests for setegid.
+///
+//===----------------------------------------------------------------------===//
+
+#include "hdr/errno_macros.h"
+#include "src/unistd/getegid.h"
+#include "src/unistd/getgid.h"
+#include "src/unistd/setegid.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+using LlvmLibcSetEGidTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcSetEGidTest, SetCurrentEGid) {
+ // Setting the effective GID to the current effective GID should succeed.
+ ASSERT_THAT(LIBC_NAMESPACE::setegid(LIBC_NAMESPACE::getegid()), Succeeds());
+}
+
+TEST_F(LlvmLibcSetEGidTest, SetCurrentGid) {
+ // Setting the effective GID to the current real GID should succeed.
+ ASSERT_THAT(LIBC_NAMESPACE::setegid(LIBC_NAMESPACE::getgid()), Succeeds());
+}
+
+TEST_F(LlvmLibcSetEGidTest, UnprivilegedInvalidGid) {
+ if (LIBC_NAMESPACE::getgid() == 0)
+ return;
+ ASSERT_THAT(LIBC_NAMESPACE::setegid(static_cast<gid_t>(-2)),
+ Fails(any_of(EINVAL, EPERM)));
+}
diff --git a/libc/test/src/unistd/seteuid_test.cpp b/libc/test/src/unistd/seteuid_test.cpp
new file mode 100644
index 00000000000000..c9dcd7f729b96b
--- /dev/null
+++ b/libc/test/src/unistd/seteuid_test.cpp
@@ -0,0 +1,40 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Unittests for seteuid.
+///
+//===----------------------------------------------------------------------===//
+
+#include "hdr/errno_macros.h"
+#include "src/unistd/geteuid.h"
+#include "src/unistd/getuid.h"
+#include "src/unistd/seteuid.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+using LlvmLibcSetEUidTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcSetEUidTest, SetCurrentEUid) {
+ // Setting the effective UID to the current effective UID should succeed.
+ ASSERT_THAT(LIBC_NAMESPACE::seteuid(LIBC_NAMESPACE::geteuid()), Succeeds());
+}
+
+TEST_F(LlvmLibcSetEUidTest, SetCurrentUid) {
+ // Setting the effective UID to the current real UID should succeed.
+ ASSERT_THAT(LIBC_NAMESPACE::seteuid(LIBC_NAMESPACE::getuid()), Succeeds());
+}
+
+TEST_F(LlvmLibcSetEUidTest, UnprivilegedInvalidUid) {
+ if (LIBC_NAMESPACE::getuid() == 0)
+ return;
+ ASSERT_THAT(LIBC_NAMESPACE::seteuid(static_cast<uid_t>(-2)),
+ Fails(any_of(EINVAL, EPERM)));
+}
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