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#include <iostream>
#include <fcntl.h>
char buf[4096] __attribute__((aligned (16)));
int main (int argc, char * const argv[]) {
if (argc != 2) {
std::cout << "Incorrect usage\n";
return 0;
}
//align buffer to 4096 boundary. Linker alignment limited this to 128 bytes, so doing it
//brute-force as have tons of memory to waste
char buf[8192];
char* pBuf = (char*)(((unsigned int)&buf / 4096) * 4096 + 4096);
int fHandle;
if (fHandle = open(argv[1], O_RDONLY | O_DIRECT)) {
int bytesRead = read(fHandle, pBuf, 4096);
pBuf[bytesRead] = '\0';
std::cout << pBuf;
} else {
std::cerr << "Failed to open direct access";
}
close(fHandle);
return 0;
}
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