Fix compilation errors

packet-exchange/src/utilities.c

 #define _GNU_SOURCE
 #include <inttypes.h>
-#include <stdint.h>
 #include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
 #include <time.h>
 #include <unistd.h>
 
 #include "utilities.h"
 
-(void)(*previous_handlers[NSIG])(int);
-static (void)(*sighand)(int);
+void (*previous_handlers[NSIG])(int);
+static void (*sighand)(int);
 
 uint64_t ts_to_uint(struct timespec t) {
   return t.tv_sec * NSEC_PER_SEC + t.tv_nsec;
@@ -36,30 +38,28 @@ uint64_t min(uint64_t a, uint64_t b) { return a < b ? a : b; }
 static void sighand_wrapper(int sig) {
 
   // If we get un unexpected signal, report it, if not print the histogram
-  if(sig == SIGINT || sig == SIGTERM)
+  if (sig == SIGINT || sig == SIGTERM)
     (*sighand)(sig); // Will print the histogram
   else
     printf("Uknown signal interrupt: %s (%d)\n", strsignal(sig), sig);
 
   // Execute the default handler
-  if(previous_handlers[sig] == SIG_DFL) {
+  if (previous_handlers[sig] == SIG_DFL) {
     signal(sig, SIG_DFL);
     raise(sig);
-  }
-  else if(previous_handlers[sig] == SIG_IGN) {
+  } else if (previous_handlers[sig] == SIG_IGN) {
     return;
-  }
-  else {
+  } else {
     (*previous_handlers[sig])(sig);
   }
 }
 
-void init_signals((void)(*_sighand(int)), int enable_histograms) {
+void init_signals(void (*_sighand)(int), int enable_histograms) {
 
   sighand = _sighand;
 
-  if(enable_histograms)
-    for(int i = 0; i < NSIG; i++)
+  if (enable_histograms)
+    for (int i = 0; i < NSIG; i++)
       signal(i, sighand_wrapper);
 }
 

packet-exchange/src/utilities.h

@@ -28,9 +28,9 @@ uint64_t calcdiff_ns(struct timespec t1, struct timespec t2);
 uint64_t max(uint64_t a, uint64_t b);
 uint64_t min(uint64_t a, uint64_t b);
 
-void init_signals((void)(*_sighand(int)), int enable_histograms);
+void init_signals(void (*_sighand)(int), int enable_histograms);
 
-extern (void)(*previous_handlers[NSIG])(int);
+extern void (*previous_handlers[NSIG])(int);
 
 
 #endif