free glibc resources before analyzing leaks

src/heapusage

@@ -46,7 +46,7 @@ showusage()
 
 showversion()
 {
-  echo "heapusage v2.02"
+  echo "heapusage v2.03"
   echo ""
   echo "Copyright (C) 2017-2021 Kristofer Berggren"
   echo ""

src/heapusage.1

@@ -1,5 +1,5 @@
 .\" DO NOT MODIFY THIS FILE!  It was generated by help2man.
-.TH HEAPUSAGE "1" "December 2021" "heapusage v2.02" "User Commands"
+.TH HEAPUSAGE "1" "January 2022" "heapusage v2.03" "User Commands"
 .SH NAME
 heapusage \- find memory leaks in applications
 .SH SYNOPSIS

src/humain.cpp

@@ -11,6 +11,7 @@
 /* ----------- Includes ------------------------------------------ */
 #include <atomic>
 #include <cstdio>
+#include <cstdlib>
 #include <cstring>
 
 #include <limits.h>
@@ -51,6 +52,14 @@ static pthread_mutex_t hu_recursive_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_N
 #warning "unsupported platform"
 #endif
 
+#if defined(__GLIBC__)
+extern "C" void __libc_freeres();
+namespace __gnu_cxx
+{
+  void __freeres();
+}
+#endif
+
 
 /* ----------- Local Functions ----------------------------------- */
 class hu_recursion_checker
@@ -118,6 +127,12 @@ void __attribute__ ((constructor)) hu_init(void)
 extern "C"
 void __attribute__ ((destructor)) hu_fini(void)
 {
+#if defined(__GLIBC__)
+  /* Free libc resources */
+  __libc_freeres();
+  __gnu_cxx::__freeres();
+#endif
+
   /* Disable logging */
   log_enable(0);
 

src/humalloc.cpp

@@ -117,7 +117,7 @@ static int hu_mprotect(void* addr, size_t len, int prot)
     if (callcount > (max_map_count / 2))
     {
       fprintf(stderr,
-              "max_map_count=%ld mprotect_count=%ld, try increasing max_map_count, ex::\n",
+              "max_map_count=%ld mprotect_count=%ld, try increasing max_map_count, ex:\n",
               max_map_count, callcount);
       fprintf(stderr, "sudo sh -c \"echo %ld > /proc/sys/vm/max_map_count\"\n",
               (2 * max_map_count));