Kernel/LibC: Add SYS_KILL/kill()

kernel/include/kernel/Process.h

@@ -101,7 +101,7 @@ namespace Kernel
 		BAN::ErrorOr<long> sys_free(void*);
 
 		BAN::ErrorOr<long> sys_signal(int, void (*)(int));
-		BAN::ErrorOr<long> sys_kill(pid_t pid, int signal);
+		BAN::ErrorOr<long> sys_kill(pid_t pid, int signal, uintptr_t& return_rsp, uintptr_t& return_rip);
 		BAN::ErrorOr<long> sys_raise(int signal, uintptr_t& return_rsp, uintptr_t& return_rip);
 
 		BAN::ErrorOr<long> sys_termid(char*) const;

kernel/kernel/Process.cpp

@@ -789,6 +789,31 @@ namespace Kernel
 		return 0;
 	}
 
+	BAN::ErrorOr<long> Process::sys_kill(pid_t pid, int signal, uintptr_t& return_rsp, uintptr_t& return_rip)
+	{
+		if (pid <= 0)
+			return BAN::Error::from_errno(ENOTSUP);
+		if (signal != 0 && (signal < _SIGMIN || signal > _SIGMAX))
+			return BAN::Error::from_errno(EINVAL);
+
+		if (pid == this->pid())
+			return sys_raise(signal, return_rsp, return_rip);
+
+		LockGuard process_guard(s_process_lock);
+		CriticalScope _;
+		for (auto* process : s_processes)
+		{
+			if (process->pid() == pid)
+			{
+				if (signal)
+					process->m_threads.front()->m_signal_queue.push(signal);
+				return 0;
+			}
+		}
+
+		return BAN::Error::from_errno(ESRCH);
+	}
+
 	BAN::ErrorOr<long> Process::sys_raise(int signal, uintptr_t& return_rsp, uintptr_t& return_rip)
 	{
 		if (signal < _SIGMIN || signal > _SIGMAX)

kernel/kernel/Syscall.cpp

@@ -143,6 +143,9 @@ namespace Kernel
 		case SYS_RAISE:
 			ret = Process::current().sys_raise((int)arg1, interrupt_stack.rsp, interrupt_stack.rip);
 			break;
+		case SYS_KILL:
+			ret = Process::current().sys_kill((pid_t)arg1, (int)arg2, interrupt_stack.rsp, interrupt_stack.rip);
+			break;
 		default:
 			dwarnln("Unknown syscall {}", syscall);
 			break;

libc/include/sys/syscall.h

@@ -42,6 +42,7 @@ __BEGIN_DECLS
 #define SYS_PIPE 35
 #define SYS_DUP2 36
 #define SYS_RAISE 37
+#define SYS_KILL 38
 
 __END_DECLS
 

libc/signal.cpp

@@ -6,3 +6,8 @@ int raise(int sig)
 {
 	return syscall(SYS_RAISE, sig);
 }
+
+int kill(pid_t pid, int sig)
+{
+	return syscall(SYS_KILL, pid, sig);
+}

libc/unistd.cpp

@@ -272,6 +272,13 @@ long syscall(long syscall, ...)
 			ret = Kernel::syscall(SYS_RAISE, signal);
 			break;
 		}
+		case SYS_KILL:
+		{
+			pid_t pid = va_arg(args, pid_t);
+			int signal = va_arg(args, int);
+			ret = Kernel::syscall(SYS_KILL, pid, signal);
+			break;
+		}
 		default:
 			puts("LibC: Unhandeled syscall");
 			ret = -ENOSYS;

userspace/Shell/main.cpp

@@ -260,9 +260,26 @@ int execute_command(BAN::Vector<BAN::String>& args)
 		while (*current)
 			printf("%s\n", *current++);
 	}
-	else if (args.front() == "raise"sv)
+	else if (args.front() == "kill-test"sv)
 	{
-		raise(SIGSEGV);
+		pid_t pid = fork();
+		if (pid == 0)
+		{
+			printf("child\n");
+			for (;;);
+		}
+		if (pid == -1)
+		{
+			perror("fork");
+			return 1;
+		}
+
+		sleep(1);
+		if (kill(pid, SIGSEGV) == -1)
+		{
+			perror("kill");
+			return 1;
+		}
 	}
 	else if (args.front() == "cd"sv)
 	{