Kernel/LibC: Implement pthread_self

kernel/include/kernel/Process.h

@@ -184,6 +184,7 @@ namespace Kernel
 
 		BAN::ErrorOr<long> sys_pthread_create(const pthread_attr_t* __restrict attr, void (*entry)(void*), void* arg);
 		BAN::ErrorOr<long> sys_pthread_exit(void* value);
+		BAN::ErrorOr<long> sys_pthread_self();
 
 		BAN::ErrorOr<long> sys_tcgetpgrp(int fd);
 		BAN::ErrorOr<long> sys_tcsetpgrp(int fd, pid_t pgid);

kernel/kernel/Process.cpp

@@ -2121,6 +2121,11 @@ namespace Kernel
 		ASSERT_NOT_REACHED();
 	}
 
+	BAN::ErrorOr<long> Process::sys_pthread_self()
+	{
+		return Thread::current().tid();
+	}
+
 	BAN::ErrorOr<long> Process::sys_tcgetpgrp(int fd)
 	{
 		LockGuard _(m_process_lock);