Everywhere: void arguments to C functions

Problem:
- C functions with no arguments require a single `void` in the argument list.

Solution:
- Put the `void` in the argument list of functions in C header files.

2 files changed, 4 insertions, 4 deletions

diff --git a/Libraries/LibPthread/pthread.h b/Libraries/LibPthread/pthread.h
index f397367054..fb5c4f2dbf 100644
--- a/Libraries/LibPthread/pthread.h
+++ b/Libraries/LibPthread/pthread.h
@@ -67,7 +67,7 @@ int pthread_attr_setstack(pthread_attr_t* attr, void*, size_t);
 int pthread_attr_getstacksize(const pthread_attr_t*, size_t*);
 int pthread_attr_setstacksize(pthread_attr_t*, size_t);
 
-int pthread_once(pthread_once_t*, void (*)());
+int pthread_once(pthread_once_t*, void (*)(void));
 #define PTHREAD_ONCE_INIT 0
 void* pthread_getspecific(pthread_key_t key);
 int pthread_setspecific(pthread_key_t key, const void* value);
@@ -100,14 +100,14 @@ int pthread_cancel(pthread_t);
 int pthread_cond_destroy(pthread_cond_t*);
 int pthread_cond_timedwait(pthread_cond_t*, pthread_mutex_t*, const struct timespec*);
 
-void pthread_testcancel();
+void pthread_testcancel(void);
 
 int pthread_spin_destroy(pthread_spinlock_t*);
 int pthread_spin_init(pthread_spinlock_t*, int);
 int pthread_spin_lock(pthread_spinlock_t*);
 int pthread_spin_trylock(pthread_spinlock_t*);
 int pthread_spin_unlock(pthread_spinlock_t*);
-pthread_t pthread_self();
+pthread_t pthread_self(void);
 int pthread_detach(pthread_t);
 int pthread_equal(pthread_t, pthread_t);
 int pthread_mutexattr_init(pthread_mutexattr_t*);
diff --git a/Libraries/LibPthread/pthread_once.cpp b/Libraries/LibPthread/pthread_once.cpp
index f46a67e292..141ad4acb7 100644
--- a/Libraries/LibPthread/pthread_once.cpp
+++ b/Libraries/LibPthread/pthread_once.cpp
@@ -37,7 +37,7 @@ enum State : i32 {
     PERFORMING_WITH_WAITERS,
 };
 
-int pthread_once(pthread_once_t* self, void (*callback)())
+int pthread_once(pthread_once_t* self, void (*callback)(void))
 {
     auto& state = reinterpret_cast<Atomic<State>&>(*self);