MMAP.cpp

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// checking for mmap() and munmap() in <sys/mman.h>
 
 
#include <sys/mman.h>
#include <sys/types.h>
 
 
void* map_file (int fd)
{
    return mmap (0, 4096, PROT_READ, MAP_PRIVATE, fd, 0);
}
 
 
int main (int argc, char *argv[])
{
    // avoid executing the code except when one or more command
    // line arguments have been specified
    if (argc < 2)
        return 0;
 
    void *p = map_file (argc);
    munmap (p, 0);
 
    return 0;
}