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#include <fcntl.h>#include <stdio.h>#include <stdlib.h>#include <sys/mman.h>#include <sys/stat.h>#include <unistd.h>void bail(const char* message){    printf("%s\n", message);    exit(1);}int detect(unsigned char* fptr, size_t size){    for (size_t i = 0; i < size; ++i)    {        if (fptr[i]) return i;    }    return 0;}int main(int argc, char* argv[]){    struct stat status;    int desc = 0;    void* fptr = NULL;    if ( argc != 2 ) bail("Invalid arguments.");    if ( stat(argv[1], &status) ) bail("stat() failed.");    desc = open(argv[1], O_RDONLY);    if ( desc == -1 ) bail("open() failed.");    fptr = mmap(0, status.st_size, PROT_READ, MAP_SHARED, desc, 0);    if ( fptr == MAP_FAILED ) bail("mmap() failed.");    if ( close(desc) ) bail("close() failed.");    if ( detect(fptr, status.st_size) ) bail("file might be corrupt.");    if ( munmap(fptr, status.st_size) ) bail("munmap() failed.");    return 0;}