MUNMAP.cpp

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// checking for munmap() in <sys/mman.h>
 
 
// include <sys/types.h> first in case mman.h depends
// on it (such as the one on Darwin -- see STDCXX-107)
#include <sys/types.h>   // for size_t
#include <sys/mman.h>    // for munmap()
 
extern "C" {
 
typedef int (f_i_vpui)(void*, size_t);
typedef int (f_i_cpui)(char*, size_t);
 
}
 
 
const char* munmap_arg2_type_imp (f_i_vpui*) { return "void*"; }
const char* munmap_arg2_type_imp (f_i_cpui*) { return "char*"; }
 
// determine whether the type of the second argument
// to munmap() is void* or char*
const char* get_munmap_arg2_type ()
{
    return munmap_arg2_type_imp (&munmap);
}
 
 
// include last so as not to pollute the global namespace
// and skew the result of the test
#include <stdio.h>
 
 
int main ()
{
    const char *argtype = get_munmap_arg2_type ();
 
    printf ("#define _RWSTD_MUNMAP_ARG1_T %s\n", argtype);
 
    return 0;
}