read_bin_cycle.c

#include <unistd.h>

//...
ssize_t buf_size = ...;
char * buffer = (char *) malloc(buf_size);
//....

ssize_t read_count = 0;
int file_in;
file_in = open(...);

int at_eof = 0;
while (!at_eof) {
    read_count = read(file_in, buffer, buf_size);
    switch(read_count) {
        // eof
        case 00: at_eof = 1; break;
        // read error
        case -1: {
            switch(errno) {
                // no data, retry read
                case EINTR: case EAGAIN:break;
                // fatal errors
                default:
                    perror("read ");
                    abort();
                break;
            }
        }
        break;
        // have some data - process it
        default: {
            // ...
            at_eof = read_count != buf_size;
        }
        break;
    }
}