代码

#include <iostream>
#include <sys/mman.h>
#include <sys/stat.h>
int main()
{
    struct stat sb; 
    int fd = fileno(stdin);
    fstat(fd, &sb);
    char *p = (char *)mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
    madvise(p, sb.st_size, MADV_SEQUENTIAL);
    puts(p);
}

评测结果