ports/vim: Fix compilation on new toolchain

ftp.gnu.org is really slow :(

kernel/include/kernel/FS/DevFS/FileSystem.h

@@ -22,6 +22,7 @@ namespace Kernel
 
 		void add_inode(BAN::StringView path, BAN::RefPtr<TmpInode>);
 
+		void initiate_disk_cache_drop();
 		void initiate_sync(bool should_block);
 
 	private:
@@ -37,6 +38,10 @@ namespace Kernel
 		ThreadBlocker m_sync_done;
 		ThreadBlocker m_sync_thread_blocker;
 		volatile bool m_should_sync { false };
+
+		SpinLock m_disk_cache_lock;
+		ThreadBlocker m_disk_cache_thread_blocker;
+		BAN::Atomic<bool> m_should_drop_disk_cache { false };
 	};
 
 }

kernel/include/kernel/FS/ProcFS/Inode.h

@@ -57,6 +57,35 @@ namespace Kernel
 		size_t (Process::*m_callback)(off_t, BAN::ByteSpan) const;
 	};
 
+	class ProcSymlinkProcessInode final : public TmpInode
+	{
+	public:
+		static BAN::ErrorOr<BAN::RefPtr<ProcSymlinkProcessInode>> create_new(Process& process, BAN::ErrorOr<BAN::String> (Process::*callback)() const, TmpFileSystem&, mode_t);
+		~ProcSymlinkProcessInode() = default;
+
+		virtual uid_t uid() const override { return m_process.credentials().ruid(); }
+		virtual gid_t gid() const override { return m_process.credentials().rgid(); }
+
+	protected:
+		virtual BAN::ErrorOr<BAN::String> link_target_impl() override;
+
+		// You may not write here and this is always non blocking
+		virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan) override		{ return BAN::Error::from_errno(EINVAL); }
+		virtual BAN::ErrorOr<void> truncate_impl(size_t) override						{ return BAN::Error::from_errno(EINVAL); }
+
+		virtual bool can_read_impl() const override { return false; }
+		virtual bool can_write_impl() const override { return false; }
+		virtual bool has_error_impl() const override { return false; }
+		virtual bool has_hungup_impl() const override { return false; }
+
+	private:
+		ProcSymlinkProcessInode(Process& process, BAN::ErrorOr<BAN::String> (Process::*)() const, TmpFileSystem&, const TmpInodeInfo&);
+
+	private:
+		Process& m_process;
+		BAN::ErrorOr<BAN::String> (Process::*m_callback)() const;
+	};
+
 	class ProcROInode final : public TmpInode
 	{
 	public:

kernel/include/kernel/Process.h

@@ -188,6 +188,9 @@ namespace Kernel
 
 		BAN::ErrorOr<long> sys_tty_ctrl(int fildes, int command, int flags);
 
+		void set_stopped(bool stopped, int signal);
+		void wait_while_stopped();
+
 		static BAN::ErrorOr<void> kill(pid_t pid, int signal);
 		BAN::ErrorOr<long> sys_kill(pid_t pid, int signal);
 		BAN::ErrorOr<long> sys_sigaction(int signal, const struct sigaction* act, struct sigaction* oact);
@@ -225,6 +228,7 @@ namespace Kernel
 		size_t proc_meminfo(off_t offset, BAN::ByteSpan) const;
 		size_t proc_cmdline(off_t offset, BAN::ByteSpan) const;
 		size_t proc_environ(off_t offset, BAN::ByteSpan) const;
+		BAN::ErrorOr<BAN::String> proc_executable() const;
 
 		BAN::StringView executable() const { return m_executable; }
 
@@ -298,12 +302,11 @@ namespace Kernel
 		}
 
 	private:
-		struct ChildExitStatus
+		struct ChildWaitStatus
 		{
-			pid_t    pid       { 0 };
-			pid_t    pgrp      { 0 };
-			int      exit_code { 0 };
-			bool     exited    { false };
+			pid_t pid  { 0 };
+			pid_t pgrp { 0 };
+			BAN::Optional<int> status;
 		};
 
 		Credentials m_credentials;
@@ -319,6 +322,9 @@ namespace Kernel
 
 		mutable Mutex m_process_lock;
 
+		BAN::Atomic<bool> m_stopped { false };
+		ThreadBlocker m_stop_blocker;
+
 		VirtualFileSystem::File m_working_directory;
 		VirtualFileSystem::File m_root_file;
 
@@ -343,8 +349,9 @@ namespace Kernel
 		BAN::Vector<BAN::String> m_environ;
 		BAN::String m_executable;
 
-		BAN::Vector<ChildExitStatus> m_child_exit_statuses;
-		ThreadBlocker m_child_exit_blocker;
+		BAN::Vector<ChildWaitStatus> m_child_wait_statuses;
+		SpinLock m_child_wait_lock;
+		ThreadBlocker m_child_wait_blocker;
 
 		BAN::Atomic<bool> m_is_exiting { false };
 

kernel/include/kernel/Storage/StorageDevice.h

@@ -33,6 +33,7 @@ namespace Kernel
 		BAN::Vector<BAN::RefPtr<Partition>>& partitions() { return m_partitions; }
 		const BAN::Vector<BAN::RefPtr<Partition>>& partitions() const { return m_partitions; }
 
+		size_t drop_disk_cache();
 		BAN::ErrorOr<void> sync_disk_cache();
 		virtual bool is_storage_device() const override { return true; }
 

kernel/include/kernel/Thread.h

@@ -53,7 +53,7 @@ namespace Kernel
 		BAN::ErrorOr<void> initialize_userspace(vaddr_t entry, BAN::Span<BAN::String> argv, BAN::Span<BAN::String> envp, BAN::Span<LibELF::AuxiliaryVector> auxv);
 
 		// Returns true, if thread is going to trigger signal
-		bool is_interrupted_by_signal() const;
+		bool is_interrupted_by_signal(bool skip_stop_and_cont = false) const;
 
 		// Returns true if pending signal can be added to thread
 		bool can_add_signal_to_execute() const;
@@ -63,6 +63,13 @@ namespace Kernel
 		void add_signal(int signal);
 		void set_suspend_signal_mask(uint64_t sigmask);
 
+		static bool is_stopping_signal(int signal);
+		static bool is_continuing_signal(int signal);
+		static bool is_terminating_signal(int signal);
+		static bool is_abnormal_terminating_signal(int signal);
+		static bool is_realtime_signal(int signal);
+		bool will_exit_because_of_signal() const;
+
 		BAN::ErrorOr<void> sigaltstack(const stack_t* ss, stack_t* oss);
 
 		// blocks current thread and returns either on unblock, eintr, spuriously or after timeout

kernel/kernel/FS/DevFS/FileSystem.cpp

@@ -8,6 +8,7 @@
 #include <kernel/FS/TmpFS/Inode.h>
 #include <kernel/Input/InputDevice.h>
 #include <kernel/Lock/LockGuard.h>
+#include <kernel/Lock/SpinLockAsMutex.h>
 #include <kernel/Process.h>
 #include <kernel/Scheduler.h>
 #include <kernel/Storage/StorageDevice.h>
@@ -62,6 +63,36 @@ namespace Kernel
 		));
 		MUST(Processor::scheduler().add_thread(updater_thread));
 
+		auto* disk_cache_drop_thread = MUST(Thread::create_kernel(
+			[](void* _devfs)
+			{
+				auto* devfs = static_cast<DevFileSystem*>(_devfs);
+
+				while (true)
+				{
+					{
+						SpinLockGuard guard(devfs->m_disk_cache_lock);
+						bool expected = true;
+						if (!devfs->m_should_drop_disk_cache.compare_exchange(expected, false))
+						{
+							SpinLockGuardAsMutex smutex(guard);
+							devfs->m_disk_cache_thread_blocker.block_indefinite(&smutex);
+							continue;
+						}
+					}
+
+					LockGuard _(devfs->m_device_lock);
+
+					size_t pages_dropped = 0;
+					for (auto& device : devfs->m_devices)
+						if (device->is_storage_device())
+							pages_dropped += static_cast<StorageDevice*>(device.ptr())->drop_disk_cache();
+					dprintln("Dropped {} pages from disk cache", pages_dropped);
+				}
+			}, s_instance
+		));
+		MUST(Processor::scheduler().add_thread(disk_cache_drop_thread));
+
 		auto* disk_sync_thread = MUST(Thread::create_kernel(
 			[](void* _devfs)
 			{
@@ -94,6 +125,13 @@ namespace Kernel
 		MUST(Processor::scheduler().add_thread(disk_sync_thread));
 	}
 
+	void DevFileSystem::initiate_disk_cache_drop()
+	{
+		SpinLockGuard _(m_disk_cache_lock);
+		m_should_drop_disk_cache = true;
+		m_disk_cache_thread_blocker.unblock();
+	}
+
 	void DevFileSystem::initiate_sync(bool should_block)
 	{
 		LockGuard _(m_device_lock);

kernel/kernel/FS/ProcFS/Inode.cpp

@@ -17,16 +17,7 @@ namespace Kernel
 		TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_meminfo, fs, 0400)), "meminfo"_sv));
 		TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_cmdline, fs, 0400)), "cmdline"_sv));
 		TRY(inode->link_inode(*MUST(ProcROProcessInode::create_new(process, &Process::proc_environ, fs, 0400)), "environ"_sv));
-
-		TRY(inode->link_inode(*MUST(ProcSymlinkInode::create_new(
-			[](void* process) -> BAN::ErrorOr<BAN::String>
-			{
-				BAN::String result;
-				TRY(result.append(static_cast<Process*>(process)->executable()));
-				return result;
-			},
-			&process, fs, 0400, process.credentials().ruid(), process.credentials().ruid()
-		)), "exe"_sv));
+		TRY(inode->link_inode(*MUST(ProcSymlinkProcessInode::create_new(process, &Process::proc_executable, fs, 0400)), "exe"_sv));
 
 		return inode;
 	}
@@ -70,6 +61,29 @@ namespace Kernel
 		return (m_process.*m_callback)(offset, buffer);
 	}
 
+	BAN::ErrorOr<BAN::RefPtr<ProcSymlinkProcessInode>> ProcSymlinkProcessInode::create_new(Process& process, BAN::ErrorOr<BAN::String> (Process::*callback)() const, TmpFileSystem& fs, mode_t mode)
+	{
+		auto inode_info = create_inode_info(Mode::IFLNK | mode, 0, 0);
+
+		auto* inode_ptr = new ProcSymlinkProcessInode(process, callback, fs, inode_info);
+		if (inode_ptr == nullptr)
+			return BAN::Error::from_errno(ENOMEM);
+		return BAN::RefPtr<ProcSymlinkProcessInode>::adopt(inode_ptr);
+	}
+
+	ProcSymlinkProcessInode::ProcSymlinkProcessInode(Process& process, BAN::ErrorOr<BAN::String> (Process::*callback)() const, TmpFileSystem& fs, const TmpInodeInfo& inode_info)
+		: TmpInode(fs, MUST(fs.allocate_inode(inode_info)), inode_info)
+		, m_process(process)
+		, m_callback(callback)
+	{
+		m_inode_info.mode |= Inode::Mode::IFLNK;
+	}
+
+	BAN::ErrorOr<BAN::String> ProcSymlinkProcessInode::link_target_impl()
+	{
+		return (m_process.*m_callback)();
+	}
+
 	BAN::ErrorOr<BAN::RefPtr<ProcROInode>> ProcROInode::create_new(size_t (*callback)(off_t, BAN::ByteSpan), TmpFileSystem& fs, mode_t mode, uid_t uid, gid_t gid)
 	{
 		auto inode_info = create_inode_info(Mode::IFREG | mode, uid, gid);

kernel/kernel/Input/InputDevice.cpp

@@ -155,6 +155,9 @@ namespace Kernel
 						case LibInput::keycode_function(1):
 							Processor::toggle_should_print_cpu_load();
 							break;
+						case LibInput::keycode_function(11):
+							DevFileSystem::get().initiate_disk_cache_drop();
+							break;
 						case LibInput::keycode_function(12):
 							Kernel::panic("Keyboard kernel panic :)");
 							break;

kernel/kernel/Input/PS2/Controller.cpp

@@ -260,7 +260,7 @@ namespace Kernel::Input
 
 		const auto* fadt = static_cast<const ACPI::FADT*>(ACPI::ACPI::get().get_header("FACP"_sv, 0));
 		if (!fadt || fadt->revision < 3 || fadt->length < iapc_flag_end)
-			return false;
+			return true;
 
 		if (!(fadt->iapc_boot_arch & (1 << 1)))
 			return false;

kernel/kernel/Process.cpp

@@ -9,6 +9,7 @@
 #include <kernel/IDT.h>
 #include <kernel/InterruptController.h>
 #include <kernel/Lock/LockGuard.h>
+#include <kernel/Lock/SpinLockAsMutex.h>
 #include <kernel/Memory/FileBackedRegion.h>
 #include <kernel/Memory/Heap.h>
 #include <kernel/Memory/MemoryBackedRegion.h>
@@ -295,21 +296,20 @@ namespace Kernel
 
 			if (parent_process)
 			{
-				LockGuard _(parent_process->m_process_lock);
+				SpinLockGuard _(parent_process->m_child_wait_lock);
 
-				for (auto& child : parent_process->m_child_exit_statuses)
+				for (auto& child : parent_process->m_child_wait_statuses)
 				{
 					if (child.pid != pid())
 						continue;
 
-					child.exit_code = __WGENEXITCODE(status, signal);
-					child.exited = true;
+					child.status = __WGENEXITCODE(status, signal);
 
 					parent_process->add_pending_signal(SIGCHLD);
 					if (!parent_process->m_threads.empty())
 						Processor::scheduler().unblock_thread(parent_process->m_threads.front());
 
-					parent_process->m_child_exit_blocker.unblock();
+					parent_process->m_child_wait_blocker.unblock();
 
 					break;
 				}
@@ -463,6 +463,14 @@ namespace Kernel
 		return read_from_vec_of_str(m_environ, offset, buffer);
 	}
 
+	BAN::ErrorOr<BAN::String> Process::proc_executable() const
+	{
+		LockGuard _(m_process_lock);
+		BAN::String result;
+		TRY(result.append(m_executable));
+		return result;
+	}
+
 	BAN::ErrorOr<VirtualFileSystem::File> Process::find_file(int fd, const char* path, int flags) const
 	{
 		ASSERT(m_process_lock.is_locked());
@@ -580,23 +588,30 @@ namespace Kernel
 
 		LockGuard _(m_process_lock);
 
-		ChildExitStatus* child_exit_status = nullptr;
-		for (auto& child : m_child_exit_statuses)
+		ChildWaitStatus* child_exit_status = nullptr;
+
 		{
-			if (child.pid != 0)
-				continue;
-			child_exit_status = &child;
-			break;
-		}
-		if (child_exit_status == nullptr)
-		{
-			TRY(m_child_exit_statuses.emplace_back());
-			child_exit_status = &m_child_exit_statuses.back();
+			SpinLockGuard _(m_child_wait_lock);
+			for (auto& child : m_child_wait_statuses)
+			{
+				if (child.pid != 0)
+					continue;
+				child_exit_status = &child;
+				break;
+			}
+			if (child_exit_status == nullptr)
+			{
+				TRY(m_child_wait_statuses.emplace_back());
+				child_exit_status = &m_child_wait_statuses.back();
+			}
 		}
 
 		auto working_directory = TRY(m_working_directory.clone());
 		auto root_file         = TRY(m_root_file.clone());
 
+		BAN::String executable;
+		TRY(executable.append(m_executable));
+
 		BAN::Vector<BAN::String> cmdline;
 		TRY(cmdline.resize(m_cmdline.size()));
 		for (size_t i = 0; i < m_cmdline.size(); i++)
@@ -621,6 +636,7 @@ namespace Kernel
 		forked->m_root_file = BAN::move(root_file);
 		forked->m_cmdline = BAN::move(cmdline);
 		forked->m_environ = BAN::move(environ);
+		forked->m_executable = BAN::move(executable);
 		forked->m_page_table = BAN::move(page_table);
 		forked->m_open_file_descriptors = BAN::move(*open_file_descriptors);
 		forked->m_mapped_regions = BAN::move(mapped_regions);
@@ -782,7 +798,7 @@ namespace Kernel
 		// FIXME: Add WCONTINUED and WUNTRACED when stopped/continued processes are added
 
 		const auto pid_matches =
-			[&](const ChildExitStatus& child)
+			[&](const ChildWaitStatus& child)
 			{
 				if (pid == -1)
 					return true;
@@ -793,47 +809,67 @@ namespace Kernel
 				return child.pid == pid;
 			};
 
-		LockGuard _(m_process_lock);
+		pid_t child_pid = 0;
+		int child_status = 0;
 
 		for (;;)
 		{
-			pid_t exited_pid = 0;
-			int exit_code = 0;
-			{
-				bool found = false;
-				for (auto& child : m_child_exit_statuses)
-				{
-					if (!pid_matches(child))
-						continue;
-					found = true;
-					if (!child.exited)
-						continue;
-					exited_pid = child.pid;
-					exit_code = child.exit_code;
-					child = {};
-					break;
-				}
+			bool found = false;
 
-				if (!found)
-					return BAN::Error::from_errno(ECHILD);
+			SpinLockGuard sguard(m_child_wait_lock);
+
+			for (auto& child : m_child_wait_statuses)
+			{
+				if (!pid_matches(child))
+					continue;
+
+				found = true;
+				if (!child.status.has_value())
+					continue;
+
+				const int status = child.status.value();
+
+				bool should_report = false;
+				if (WIFSTOPPED(status))
+					should_report = !!(options & WUNTRACED);
+				else if (WIFCONTINUED(status))
+					should_report = !!(options & WCONTINUED);
+				else
+					should_report = true;
+
+				if (!should_report)
+					continue;
+
+				child_pid = child.pid;
+				child_status = status;
+				child.status = {};
+
+				break;
 			}
 
-			if (exited_pid != 0)
-			{
-				if (stat_loc)
-				{
-					TRY(validate_pointer_access(stat_loc, sizeof(stat_loc), true));
-					*stat_loc = exit_code;
-				}
-				remove_pending_signal(SIGCHLD);
-				return exited_pid;
-			}
+			if (child_pid != 0)
+				break;
+
+			if (!found)
+				return BAN::Error::from_errno(ECHILD);
 
 			if (options & WNOHANG)
 				return 0;
 
-			TRY(Thread::current().block_or_eintr_indefinite(m_child_exit_blocker, &m_process_lock));
+			SpinLockGuardAsMutex smutex(sguard);
+			TRY(Thread::current().block_or_eintr_indefinite(m_child_wait_blocker, &smutex));
 		}
+
+		LockGuard _(m_process_lock);
+
+		if (stat_loc)
+		{
+			TRY(validate_pointer_access(stat_loc, sizeof(stat_loc), true));
+			*stat_loc = child_status;
+		}
+
+		remove_pending_signal(SIGCHLD);
+		return child_pid;
 	}
 
 	BAN::ErrorOr<long> Process::sys_sleep(int seconds)
@@ -2571,6 +2607,69 @@ namespace Kernel
 		return 0;
 	}
 
+	void Process::set_stopped(bool stopped, int signal)
+	{
+		SpinLockGuard _(m_signal_lock);
+
+		Process* parent = nullptr;
+
+		for_each_process(
+			[&parent, this](Process& process) -> BAN::Iteration
+			{
+				if (process.pid() != m_parent)
+					return BAN::Iteration::Continue;
+				parent = &process;
+				return BAN::Iteration::Break;
+			}
+		);
+
+		if (parent != nullptr)
+		{
+			{
+				SpinLockGuard _(parent->m_child_wait_lock);
+
+				for (auto& child : parent->m_child_wait_statuses)
+				{
+					if (child.pid != pid())
+						continue;
+					if (!child.status.has_value() || WIFCONTINUED(*child.status) || WIFSTOPPED(*child.status))
+						child.status = stopped
+							? __WGENSTOPCODE(signal)
+							: __WGENCONTCODE();
+					break;
+				}
+
+				parent->m_child_wait_blocker.unblock();
+			}
+
+			if (!(m_signal_handlers[SIGCHLD].sa_flags & SA_NOCLDSTOP))
+			{
+				parent->add_pending_signal(SIGCHLD);
+				if (!parent->m_threads.empty())
+					Processor::scheduler().unblock_thread(parent->m_threads.front());
+			}
+		}
+
+		m_stopped = stopped;
+		m_stop_blocker.unblock();
+	}
+
+	void Process::wait_while_stopped()
+	{
+		for (;;)
+		{
+			while (Thread::current().will_exit_because_of_signal())
+				Thread::current().handle_signal();
+
+			SpinLockGuard guard(m_signal_lock);
+			if (!m_stopped)
+				break;
+
+			SpinLockGuardAsMutex smutex(guard);
+			m_stop_blocker.block_indefinite(&smutex);
+		}
+	}
+
 	BAN::ErrorOr<void> Process::kill(pid_t pid, int signal)
 	{
 		if (pid == 0 || pid == -1)
@@ -2582,18 +2681,26 @@ namespace Kernel
 		for_each_process(
 			[&](Process& process)
 			{
-				if (pid == process.pid() || -pid == process.pgrp())
+				if (pid != process.pid() && -pid != process.pgrp())
+					return BAN::Iteration::Continue;
+
+				found = true;
+
+				if (signal == 0)
+					;
+				// NOTE: stopped signals go through thread's signal handling code
+				//       because for example SIGTSTP can be ignored
+				else if (Thread::is_continuing_signal(signal))
+					process.set_stopped(false, signal);
+				else
 				{
-					found = true;
-					if (signal)
-					{
-						process.add_pending_signal(signal);
-						if (!process.m_threads.empty())
-							Processor::scheduler().unblock_thread(process.m_threads.front());
-					}
-					return (pid > 0) ? BAN::Iteration::Break : BAN::Iteration::Continue;
+					process.add_pending_signal(signal);
+					if (!process.m_threads.empty())
+						Processor::scheduler().unblock_thread(process.m_threads.front());
+					process.m_stop_blocker.unblock();
 				}
-				return BAN::Iteration::Continue;
+
+				return (pid > 0) ? BAN::Iteration::Break : BAN::Iteration::Continue;
 			}
 		);
 
@@ -2611,8 +2718,17 @@ namespace Kernel
 
 		if (pid == m_pid)
 		{
-			if (signal)
+			if (signal == 0)
+				;
+			// NOTE: stopped signals go through thread's signal handling code
+			//       because for example SIGTSTP can be ignored
+			else if (Thread::is_continuing_signal(signal))
+				set_stopped(false, signal);
+			else
+			{
 				add_pending_signal(signal);
+				m_stop_blocker.unblock();
+			}
 			return 0;
 		}
 

kernel/kernel/Storage/StorageDevice.cpp

@@ -216,6 +216,14 @@ namespace Kernel
 		m_disk_cache.emplace(sector_size(), *this);
 	}
 
+	size_t StorageDevice::drop_disk_cache()
+	{
+		LockGuard _(m_mutex);
+		if (m_disk_cache.has_value())
+			return m_disk_cache->release_pages(-1);
+		return 0;
+	}
+
 	BAN::ErrorOr<void> StorageDevice::sync_disk_cache()
 	{
 		LockGuard _(m_mutex);

kernel/kernel/Syscall.cpp

@@ -46,6 +46,8 @@ namespace Kernel
 
 		Processor::set_interrupt_state(InterruptState::Enabled);
 
+		Process::current().wait_while_stopped();
+
 		BAN::ErrorOr<long> ret = BAN::Error::from_errno(ENOSYS);
 
 		const char* process_path = Process::current().name();
@@ -92,6 +94,8 @@ namespace Kernel
 		if (ret.is_error() && ret.error().is_kernel_error())
 			Kernel::panic("Kernel error while returning to userspace {}", ret.error());
 
+		Process::current().wait_while_stopped();
+
 		Processor::set_interrupt_state(InterruptState::Disabled);
 
 		auto& current_thread = Thread::current();

kernel/kernel/Thread.cpp

@@ -69,6 +69,77 @@ namespace Kernel
 		s_default_sse_storage_initialized = true;
 	}
 
+	bool Thread::is_stopping_signal(int signal)
+	{
+		switch(signal)
+		{
+			case SIGSTOP:
+			case SIGTSTP:
+			case SIGTTIN:
+			case SIGTTOU:
+				return true;
+			default:
+				return false;
+		}
+	}
+
+	bool Thread::is_continuing_signal(int signal)
+	{
+		switch(signal)
+		{
+			case SIGCONT:
+				return true;
+			default:
+				return false;
+		}
+	}
+
+	bool Thread::is_terminating_signal(int signal)
+	{
+		switch (signal)
+		{
+			case SIGALRM:
+			case SIGHUP:
+			case SIGINT:
+			case SIGKILL:
+			case SIGPIPE:
+			case SIGTERM:
+			case SIGUSR1:
+			case SIGUSR2:
+			case SIGPOLL:
+			case SIGPROF:
+			case SIGVTALRM:
+				return true;
+			default:
+				return false;
+		}
+	}
+
+	bool Thread::is_abnormal_terminating_signal(int signal)
+	{
+		switch (signal)
+		{
+			case SIGABRT:
+			case SIGBUS:
+			case SIGFPE:
+			case SIGILL:
+			case SIGQUIT:
+			case SIGSEGV:
+			case SIGSYS:
+			case SIGTRAP:
+			case SIGXCPU:
+			case SIGXFSZ:
+				return true;
+			default:
+				return false;
+		}
+	}
+
+	bool Thread::is_realtime_signal(int signal)
+	{
+		return SIGRTMIN <= signal && signal <= SIGRTMAX;
+	}
+
 	static bool is_default_ignored_signal(int signal)
 	{
 		switch (signal)
@@ -79,7 +150,7 @@ namespace Kernel
 			case SIGCANCEL:
 				return true;
 			default:
-				return false;
+				return Thread::is_realtime_signal(signal);
 		}
 	}
 
@@ -458,7 +529,7 @@ namespace Kernel
 		memset(&m_interrupt_registers, 0, sizeof(InterruptRegisters));
 	}
 
-	bool Thread::is_interrupted_by_signal() const
+	bool Thread::is_interrupted_by_signal(bool skip_stop_and_cont) const
 	{
 		if (!is_userspace() || m_state != State::Executing)
 			return false;
@@ -472,6 +543,8 @@ namespace Kernel
 		{
 			if (!(signals & ((uint64_t)1 << i)))
 				continue;
+			if (skip_stop_and_cont && (is_stopping_signal(i) || is_continuing_signal(i)))
+				continue;
 
 			vaddr_t signal_handler;
 			{
@@ -501,13 +574,23 @@ namespace Kernel
 		return interrupt_stack.ip == (uintptr_t)signal_trampoline;
 	}
 
+	bool Thread::will_exit_because_of_signal() const
+	{
+		const uint64_t full_pending_mask = m_signal_pending_mask | process().signal_pending_mask();
+		const uint64_t signals = full_pending_mask & ~m_signal_block_mask;
+		for (size_t sig = _SIGMIN; sig <= _SIGMAX; sig++)
+			if (signals & (static_cast<uint64_t>(1) << sig))
+				if (is_terminating_signal(sig) || is_abnormal_terminating_signal(sig))
+					return true;
+		return false;
+	}
+
 	bool Thread::handle_signal(int signal)
 	{
 		ASSERT(&Thread::current() == this);
 		ASSERT(is_userspace());
 
 		auto state = m_signal_lock.lock();
-		ASSERT(state == InterruptState::Disabled);
 
 		auto& interrupt_stack = *reinterpret_cast<InterruptStack*>(kernel_stack_top() - sizeof(InterruptStack));
 		ASSERT(GDT::is_user_segment(interrupt_stack.cs));
@@ -613,52 +696,31 @@ namespace Kernel
 		}
 		else
 		{
-			switch (signal)
+			if (is_abnormal_terminating_signal(signal))
+			{
+				process().exit(128 + signal, signal | 0x80);
+				ASSERT_NOT_REACHED();
+			}
+			else if (is_terminating_signal(signal))
+			{
+				process().exit(128 + signal, signal);
+				ASSERT_NOT_REACHED();
+			}
+			else if (is_stopping_signal(signal))
+			{
+				process().set_stopped(true, signal);
+			}
+			else if (is_continuing_signal(signal))
+			{
+				process().set_stopped(false, signal);
+			}
+			else if (is_default_ignored_signal(signal))
 			{
-				// Abnormal termination of the process with additional actions.
-				case SIGABRT:
-				case SIGBUS:
-				case SIGFPE:
-				case SIGILL:
-				case SIGQUIT:
-				case SIGSEGV:
-				case SIGSYS:
-				case SIGTRAP:
-				case SIGXCPU:
-				case SIGXFSZ:
-					process().exit(128 + signal, signal | 0x80);
-					ASSERT_NOT_REACHED();
 
-				// Abnormal termination of the process
-				case SIGALRM:
-				case SIGHUP:
-				case SIGINT:
-				case SIGKILL:
-				case SIGPIPE:
-				case SIGTERM:
-				case SIGUSR1:
-				case SIGUSR2:
-				case SIGPOLL:
-				case SIGPROF:
-				case SIGVTALRM:
-					process().exit(128 + signal, signal);
-					ASSERT_NOT_REACHED();
-
-				// Stop the process:
-				case SIGSTOP:
-				case SIGTSTP:
-				case SIGTTIN:
-				case SIGTTOU:
-					ASSERT_NOT_REACHED();
-
-				// Continue the process, if it is stopped; otherwise, ignore the signal.
-				case SIGCONT:
-					ASSERT_NOT_REACHED();
-
-				default:
-					if (is_default_ignored_signal(signal))
-						break;
-					panic("Executing unhandled signal {}", signal);
+			}
+			else
+			{
+				panic("Executing unhandled signal {}", signal);
 			}
 		}
 
@@ -739,20 +801,20 @@ namespace Kernel
 
 	BAN::ErrorOr<void> Thread::sleep_or_eintr_ns(uint64_t ns)
 	{
-		if (is_interrupted_by_signal())
+		if (is_interrupted_by_signal(true))
 			return BAN::Error::from_errno(EINTR);
 		SystemTimer::get().sleep_ns(ns);
-		if (is_interrupted_by_signal())
+		if (is_interrupted_by_signal(true))
 			return BAN::Error::from_errno(EINTR);
 		return {};
 	}
 
 	BAN::ErrorOr<void> Thread::block_or_eintr_indefinite(ThreadBlocker& thread_blocker, BaseMutex* mutex)
 	{
-		if (is_interrupted_by_signal())
+		if (is_interrupted_by_signal(true))
 			return BAN::Error::from_errno(EINTR);
 		thread_blocker.block_indefinite(mutex);
-		if (is_interrupted_by_signal())
+		if (is_interrupted_by_signal(true))
 			return BAN::Error::from_errno(EINTR);
 		return {};
 	}
@@ -765,10 +827,10 @@ namespace Kernel
 
 	BAN::ErrorOr<void> Thread::block_or_eintr_or_waketime_ns(ThreadBlocker& thread_blocker, uint64_t wake_time_ns, bool etimedout, BaseMutex* mutex)
 	{
-		if (is_interrupted_by_signal())
+		if (is_interrupted_by_signal(true))
 			return BAN::Error::from_errno(EINTR);
 		thread_blocker.block_with_wake_time_ns(wake_time_ns, mutex);
-		if (is_interrupted_by_signal())
+		if (is_interrupted_by_signal(true))
 			return BAN::Error::from_errno(EINTR);
 		if (etimedout && SystemTimer::get().ms_since_boot() >= wake_time_ns)
 			return BAN::Error::from_errno(ETIMEDOUT);

ports/bash/build.sh

@@ -2,7 +2,7 @@
 
 NAME='bash'
 VERSION='5.2.37'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/bash/bash-$VERSION.tar.gz#9599b22ecd1d5787ad7d3b7bf0c59f312b3396d1e281175dd1f8a4014da621ff"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/bash/bash-$VERSION.tar.gz#9599b22ecd1d5787ad7d3b7bf0c59f312b3396d1e281175dd1f8a4014da621ff"
 DEPENDENCIES=('ncurses')
 CONFIG_SUB=('support/config.sub')
 CONFIGURE_OPTIONS=(

ports/binutils/build.sh

@@ -2,7 +2,7 @@
 
 NAME='binutils'
 VERSION='2.44'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/binutils/binutils-$VERSION.tar.gz#0cdd76777a0dfd3dd3a63f215f030208ddb91c2361d2bcc02acec0f1c16b6a2e"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/binutils/binutils-$VERSION.tar.gz#0cdd76777a0dfd3dd3a63f215f030208ddb91c2361d2bcc02acec0f1c16b6a2e"
 DEPENDENCIES=('zlib' 'zstd')
 MAKE_INSTALL_TARGETS=('install-strip')
 CONFIGURE_OPTIONS=(

ports/gcc/build.sh

@@ -2,7 +2,7 @@
 
 NAME='gcc'
 VERSION='15.2.0'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/gcc/gcc-$VERSION/gcc-$VERSION.tar.xz#438fd996826b0c82485a29da03a72d71d6e3541a83ec702df4271f6fe025d24e"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/gcc/gcc-$VERSION/gcc-$VERSION.tar.xz#438fd996826b0c82485a29da03a72d71d6e3541a83ec702df4271f6fe025d24e"
 DEPENDENCIES=('binutils' 'gmp' 'mpfr' 'mpc')
 MAKE_INSTALL_TARGETS=('install-strip-gcc' 'install-strip-target-libgcc' 'install-strip-target-libstdc++-v3')
 CONFIGURE_OPTIONS=(

ports/gmp/build.sh

@@ -2,11 +2,11 @@
 
 NAME='gmp'
 VERSION='6.3.0'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/gmp/gmp-$VERSION.tar.xz#a3c2b80201b89e68616f4ad30bc66aee4927c3ce50e33929ca819d5c43538898"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/gmp/gmp-$VERSION.tar.xz#a3c2b80201b89e68616f4ad30bc66aee4927c3ce50e33929ca819d5c43538898"
 CONFIG_SUB=('configfsf.sub')
-
-# configure does not work with (default) c23
-export CFLAGS="--std=c17 $CFLAGS"
+CONFIGURE_OPTIONS=(
+	'CFLAGS=-std=c17'
+)
 
 post_install() {
 	# remove libtool file

ports/libiconv/build.sh

@@ -2,7 +2,7 @@
 
 NAME='libiconv'
 VERSION='1.18'
-DOWNLOAD_URL="https://ftp.gnu.org/pub/gnu/libiconv/libiconv-$VERSION.tar.gz#3b08f5f4f9b4eb82f151a7040bfd6fe6c6fb922efe4b1659c66ea933276965e8"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/pub/gnu/libiconv/libiconv-$VERSION.tar.gz#3b08f5f4f9b4eb82f151a7040bfd6fe6c6fb922efe4b1659c66ea933276965e8"
 CONFIG_SUB=('build-aux/config.sub' 'libcharset/build-aux/config.sub')
 CONFIGURE_OPTIONS=(
 	'--disable-nls'

ports/make/build.sh

@@ -2,7 +2,7 @@
 
 NAME='make'
 VERSION='4.4.1'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/make/make-$VERSION.tar.gz#dd16fb1d67bfab79a72f5e8390735c49e3e8e70b4945a15ab1f81ddb78658fb3"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/make/make-$VERSION.tar.gz#dd16fb1d67bfab79a72f5e8390735c49e3e8e70b4945a15ab1f81ddb78658fb3"
 CONFIG_SUB=('build-aux/config.sub')
 CONFIGURE_OPTIONS=(
 	'--with-sysroot=/'

ports/mpc/build.sh

@@ -2,7 +2,7 @@
 
 NAME='mpc'
 VERSION='1.3.1'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/mpc/mpc-$VERSION.tar.gz#ab642492f5cf882b74aa0cb730cd410a81edcdbec895183ce930e706c1c759b8"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/mpc/mpc-$VERSION.tar.gz#ab642492f5cf882b74aa0cb730cd410a81edcdbec895183ce930e706c1c759b8"
 DEPENDENCIES=('gmp' 'mpfr')
 CONFIG_SUB=('build-aux/config.sub')
 CONFIGURE_OPTIONS=(

ports/mpfr/build.sh

@@ -2,7 +2,7 @@
 
 NAME='mpfr'
 VERSION='4.2.2'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/mpfr/mpfr-$VERSION.tar.gz#826cbb24610bd193f36fde172233fb8c009f3f5c2ad99f644d0dea2e16a20e42"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/mpfr/mpfr-$VERSION.tar.gz#826cbb24610bd193f36fde172233fb8c009f3f5c2ad99f644d0dea2e16a20e42"
 DEPENDENCIES=('gmp')
 CONFIG_SUB=('config.sub')
 CONFIGURE_OPTIONS=(

ports/ncurses/build.sh

@@ -2,7 +2,7 @@
 
 NAME='ncurses'
 VERSION='6.5'
-DOWNLOAD_URL="https://ftp.gnu.org/gnu/ncurses/ncurses-$VERSION.tar.gz#136d91bc269a9a5785e5f9e980bc76ab57428f604ce3e5a5a90cebc767971cc6"
+DOWNLOAD_URL="https://ftpmirror.gnu.org/gnu/ncurses/ncurses-$VERSION.tar.gz#136d91bc269a9a5785e5f9e980bc76ab57428f604ce3e5a5a90cebc767971cc6"
 CONFIG_SUB=('config.sub')
 CONFIGURE_OPTIONS=(
 	"--with-pkg-config='$PKG_CONFIG'"

ports/tuxracer/build.sh

@@ -10,6 +10,8 @@ CONFIGURE_OPTIONS=(
 	'--without-gl-libs'
 	'--with-tcl-lib-name=tcl8.6'
 	'--without-x'
+	'ac_cv_func_isnan=yes'
+	'CFLAGS="-std=c99 -Wno-implicit-int -Wno-incompatible-pointer-types'
 )
 
 post_install() {
@@ -29,6 +31,3 @@ post_install() {
 
 	popd
 }
-
-export CFLAGS="-std=c99 -Wno-implicit-int -Wno-incompatible-pointer-types $CFLAGS"
-export ac_cv_func_isnan=yes

ports/vim/build.sh

@@ -15,6 +15,7 @@ CONFIGURE_OPTIONS=(
 	'vim_cv_getcwd_broken=no'
 	'vim_cv_stat_ignores_slash=yes'
 	'vim_cv_memmove_handles_overlap=yes'
+	'CFLAGS=-Wno-incompatible-pointer-types'
 )
 
 post_configure() {

toolchain/build.sh

@@ -3,15 +3,15 @@ set -e
 
 BINUTILS_VERSION="binutils-2.45"
 BINUTILS_TAR="$BINUTILS_VERSION.tar.xz"
-BINUTILS_URL="https://ftp.gnu.org/gnu/binutils/$BINUTILS_TAR"
+BINUTILS_URL="https://ftpmirror.gnu.org/gnu/binutils/$BINUTILS_TAR"
 
 GCC_VERSION="gcc-15.2.0"
 GCC_TAR="$GCC_VERSION.tar.xz"
-GCC_URL="https://ftp.gnu.org/gnu/gcc/$GCC_VERSION/$GCC_TAR"
+GCC_URL="https://ftpmirror.gnu.org/gnu/gcc/$GCC_VERSION/$GCC_TAR"
 
 GRUB_VERSION="grub-2.06"
 GRUB_TAR="$GRUB_VERSION.tar.xz"
-GRUB_URL="https://ftp.gnu.org/gnu/grub/$GRUB_TAR"
+GRUB_URL="https://ftpmirror.gnu.org/gnu/grub/$GRUB_TAR"
 
 CMAKE_VERSION="cmake-3.26.6-linux-x86_64"
 CMAKE_TAR="$CMAKE_VERSION.tar.gz"

userspace/libraries/LibC/include/sys/wait.h

@@ -20,14 +20,17 @@ __BEGIN_DECLS
 #define WNOWAIT		0x10
 #define WSTOPPED	0x20
 
-#define WEXITSTATUS(status) (((status) >> 8) & 0xFF)
-#define WSTOPSIG(status) WEXITSTATUS(status)
-#define WTERMSIG(status) ((status) & 0x7F)
-#define WIFEXITED(status) (WTERMSIG(status) == 0)
-#define WIFSIGNALED(status) (((status) & 0x7F) > 0 && ((status) & 0x7F) < 0x7F)
-#define	WIFSTOPPED(status) (((status) & 0xFF) == 0x7F)
+#define WEXITSTATUS(status)  (((status) >> 8) & 0xFF)
+#define WSTOPSIG(status)     WEXITSTATUS(status)
+#define WTERMSIG(status)     ((status) & 0x7F)
+#define WIFEXITED(status)    (WTERMSIG(status) == 0)
+#define WIFSIGNALED(status)  (((status) & 0x7F) > 0 && ((status) & 0x7F) < 0x7E)
+#define	WIFSTOPPED(status)   (((status) & 0x7F) == 0x7F)
+#define WIFCONTINUED(status) (((status) & 0x7F) == 0x7E)
 
 #define __WGENEXITCODE(ret, sig) (((ret) << 8) | (sig))
+#define __WGENSTOPCODE(sig)      (((sig) << 8) | 0x7F)
+#define __WGENCONTCODE()         (               0x7E)
 
 typedef enum
 {