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FILE* fp;
int fd;
off_t file_size;
char *buffer;
struct stat st;
  
fd = open("foo.bin", O_RDONLY);
if (fd == -1) {
  /* Handle Error */
}

fp = fdopen(fd, "r");
if (fp == NULL) {
  /* Handle Error */
}


/* Ensure that the file is a regular file */
if ((fstat(fd, &st) != 0) || (!S_ISREG(st.st_mode))) {
  /* Handle Error */
}
 
if (fseeko(fp, 0 , SEEK_END) != 0) {
  /* Handle Error */
}
  
file_size = ftello(fp);
if (file_size == -1) {
  /* Handle Error */
}
 
buffer = (char*)malloc(file_size);
if (buffer == NULL) {
  /* Handle Error */
}

/* ... */ 

int fd;
long file_size;
char *buffer;

_sopen_s(&fd, "foo.bin", _O_RDONLY, _SH_DENYRW, _S_IREAD);
if (fd == -1) {
  /* Handle Error */
}

file_size = _filelength(fd);
if (file_size == -1) {
  /* Handle Error */
}

buffer = (char*)malloc(file_size);
if (buffer == NULL) {
  /* Handle Error */
}

/* ... */