LibCore: Add support for compiling for Android with API Version >= 30

Most changes are around user and group management, which are exposed in
the Android NDK differently than other Unices.

We require version 30 for memfd_create, version 28 for posix_spawn, and
so on. It's possible a shim for memfd_create could be used, but since
Google is mandating new apps use API level 30 as of Nov 2022, this seems
suitable.

5 files changed, 16 insertions, 10 deletions

diff --git a/Userland/Libraries/LibCore/CMakeLists.txt b/Userland/Libraries/LibCore/CMakeLists.txt
index 96940c060d..a22ab5245f 100644
--- a/Userland/Libraries/LibCore/CMakeLists.txt
+++ b/Userland/Libraries/LibCore/CMakeLists.txt
@@ -1,5 +1,4 @@
 set(SOURCES
-    Account.cpp
     AnonymousBuffer.cpp
     ArgsParser.cpp
     ConfigFile.cpp
@@ -38,6 +37,9 @@ set(SOURCES
     UDPServer.cpp
     Version.cpp
 )
+if (NOT ANDROID)
+    list(APPEND SOURCES Account.cpp)
+endif()
 
 serenity_lib(LibCore core)
 target_link_libraries(LibCore LibC LibCrypt)
diff --git a/Userland/Libraries/LibCore/Group.cpp b/Userland/Libraries/LibCore/Group.cpp
index 259ede81bc..e38aace24e 100644
--- a/Userland/Libraries/LibCore/Group.cpp
+++ b/Userland/Libraries/LibCore/Group.cpp
@@ -11,7 +11,7 @@
 
 namespace Core {
 
-#ifndef AK_OS_BSD_GENERIC
+#if !defined(AK_OS_BSD_GENERIC) && !defined(AK_OS_ANDROID)
 ErrorOr<void> Group::add_group(Group& group)
 {
     if (group.name().is_empty())
diff --git a/Userland/Libraries/LibCore/Group.h b/Userland/Libraries/LibCore/Group.h
index 6f49007fb7..1e291e7a53 100644
--- a/Userland/Libraries/LibCore/Group.h
+++ b/Userland/Libraries/LibCore/Group.h
@@ -15,7 +15,7 @@ namespace Core {
 
 class Group {
 public:
-#ifndef AK_OS_BSD_GENERIC
+#if !defined(AK_OS_BSD_GENERIC) && !defined(AK_OS_ANDROID)
     static ErrorOr<void> add_group(Group& group);
 #endif
 
diff --git a/Userland/Libraries/LibCore/System.cpp b/Userland/Libraries/LibCore/System.cpp
index a3b1972bdf..770569b987 100644
--- a/Userland/Libraries/LibCore/System.cpp
+++ b/Userland/Libraries/LibCore/System.cpp
@@ -13,7 +13,6 @@
 #include <AK/String.h>
 #include <AK/Vector.h>
 #include <LibCore/System.h>
-#include <LibSystem/syscall.h>
 #include <limits.h>
 #include <stdarg.h>
 #include <stdlib.h>
@@ -25,6 +24,7 @@
 #include <unistd.h>
 
 #ifdef __serenity__
+#    include <LibSystem/syscall.h>
 #    include <serenity.h>
 #endif
 
@@ -182,7 +182,7 @@ ErrorOr<void> profiling_free_buffer(pid_t pid)
 }
 #endif
 
-#ifndef AK_OS_BSD_GENERIC
+#if !defined(AK_OS_BSD_GENERIC) && !defined(AK_OS_ANDROID)
 ErrorOr<Optional<struct spwd>> getspent()
 {
     errno = 0;
@@ -917,17 +917,19 @@ ErrorOr<struct utsname> uname()
     return uts;
 }
 
+#ifndef AK_OS_ANDROID
 ErrorOr<void> adjtime(const struct timeval* delta, struct timeval* old_delta)
 {
-#ifdef __serenity__
+#    ifdef __serenity__
     int rc = syscall(SC_adjtime, delta, old_delta);
     HANDLE_SYSCALL_RETURN_VALUE("adjtime", rc, {});
-#else
+#    else
     if (::adjtime(delta, old_delta) < 0)
         return Error::from_syscall("adjtime"sv, -errno);
     return {};
-#endif
+#    endif
 }
+#endif
 
 ErrorOr<void> exec(StringView filename, Span<StringView> arguments, SearchInPath search_in_path, Optional<Span<StringView>> environment)
 {
diff --git a/Userland/Libraries/LibCore/System.h b/Userland/Libraries/LibCore/System.h
index a3b4072899..e25c2e7777 100644
--- a/Userland/Libraries/LibCore/System.h
+++ b/Userland/Libraries/LibCore/System.h
@@ -26,7 +26,7 @@
 #include <time.h>
 #include <utime.h>
 
-#ifndef AK_OS_BSD_GENERIC
+#if !defined(AK_OS_BSD_GENERIC) && !defined(AK_OS_ANDROID)
 #    include <shadow.h>
 #endif
 
@@ -78,7 +78,7 @@ ALWAYS_INLINE ErrorOr<void> unveil(std::nullptr_t, std::nullptr_t)
     return unveil(StringView {}, StringView {});
 }
 
-#ifndef AK_OS_BSD_GENERIC
+#if !defined(AK_OS_BSD_GENERIC) && !defined(AK_OS_ANDROID)
 ErrorOr<Optional<struct spwd>> getspent();
 ErrorOr<Optional<struct spwd>> getspnam(StringView name);
 #endif
@@ -157,7 +157,9 @@ ErrorOr<void> unlink(StringView path);
 ErrorOr<void> utime(StringView path, Optional<struct utimbuf>);
 ErrorOr<struct utsname> uname();
 ErrorOr<Array<int, 2>> pipe2(int flags);
+#ifndef AK_OS_ANDROID
 ErrorOr<void> adjtime(const struct timeval* delta, struct timeval* old_delta);
+#endif
 enum class SearchInPath {
     No,
     Yes,