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Storage Manager `storage_mgr.c`

#include <stdio.h>

Use fopen() to open the file.

FILE *fp;
fp = fopen(fileName, "rb+");
if (!fp) { return FAILED; }

Use fseeko() and ftello() to get filesize.

fseeko(fp, 0, SEEK_END);
off_t size = ftello(fp);
fseeko(fp, 0, SEEK_SET);

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

Use open() to open the file.

int fd;
fd = open(fileName, O_RDWR);
if (-1 == fd) { return FAILED; }

Get filesize.

struct stat buf;
fstat(fd, &buf);
int size = buf.st_size;

If a FILE pointer is needed, use fdopen() to open that file.

FILE *fp;
fp = fdopen(fd, "rb+");