Add const.

Author: aaronriekenberg

fdutil.c

@@ -106,7 +106,7 @@ struct ReadFromFDResult readFromFD(
 
 static ssize_t signalSafeWrite(
   int fd,
-  void* buf,
+  const void* buf,
   size_t count)
 {
   bool interrupted;
@@ -123,7 +123,7 @@ static ssize_t signalSafeWrite(
 
 struct WriteToFDResult writeToFD(
   int fd,
-  void* buf,
+  const void* buf,
   size_t bytesToWrite)
 {
   ssize_t writeRetVal;

fdutil.h

@@ -58,7 +58,7 @@ struct WriteToFDResult
 
 struct WriteToFDResult writeToFD(
   int fd,
-  void* buf,
+  const void* buf,
   size_t bytesToWrite);
 
 extern int signalSafeClose(

proxy.c

@@ -1198,9 +1198,9 @@ static void writeAcceptedFDToIOThread(
   const struct ProxySettings* proxySettings,
   const int* ioThreadPipeWriteFDs,
   size_t* nextPipeWriteFDIndex,
-  int acceptedFD)
+  const int acceptedFD)
 {
-  unsigned char* pCharBuffer = (unsigned char*)(&acceptedFD);
+  const unsigned char* pCharBuffer = (const unsigned char*)(&acceptedFD);
   size_t bytesToWrite = sizeof(int);
   size_t totalBytesWritten = 0;