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/* some device used for both input and output */
const 
char const *filename = "/dev/device2";

FILE *file = fopen(filename, "rb+");
if (file == NULL) {
  /* handle error */
}

/* write to file stream */
/* read response from file stream */
fclose(file);

/* some device used for both input and output */
const 
char const *filename = "/dev/device2";

FILE *file = fopen(filename, "rb+");
if (file == NULL) {
  /* handle error */
]

/* write to file stream */
fflush(file);
/* read response from file stream */
fclose(file);