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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#define HUGEPAGE_SIZE (2UL * 1024 * 1024) /* Assuming 2MB hugepage size */
unsigned char *mincore_hugepages(unsigned char *addr, unsigned long bytes)
{
/* hugepage size assumed to be 2MB and */
unsigned long length_of_vector = (bytes / HUGEPAGE_SIZE) + 1;
unsigned char *ptr = NULL; /* initialize to NULL */
/* allocate 'length_of_vector' bytes for mincore page information */
if ((ptr = (unsigned char *)malloc(length_of_vector)) == NULL) {
fprintf(stderr, "Unable to allocate requested memory");
fprintf(stdout, "exiting now...");
exit(1);
}
if ((mincore(addr, bytes, ptr)) == -1) {
fprintf(stderr, "mincore failed with error: %s", strerror(errno));
free(ptr);
exit(1);
}
return ptr;
}
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