open_close.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <ctype.h>

#include <flinklib.h>

#define DEFAULT_DEV "/dev/flink0"

int main(int argc, char* argv[]) {
    flink_dev* dev;
    char* dev_name = DEFAULT_DEV;
    char c;
    
    /* Compute command line arguments */
    while((c = getopt(argc, argv, "d:")) != -1) {
        switch(c) {
            case 'd': // device
                dev_name = optarg;
                break;
            case '?':
                if(optopt == 'd') fprintf(stderr, "Option -%c requires an argument.\n", optopt);
                else if(isprint(optopt)) fprintf (stderr, "Unknown option `-%c'.\n", optopt);
                else fprintf(stderr, "Unknown option character `\\x%x'.\n", optopt);
                return -1;
            default:
                abort();
        }
    }
    
    printf("Opening device %s...\n", dev_name);
    dev = flink_open(dev_name);
    if(dev == NULL) {
        printf("Failed to open device!\n");
        return -1;
    }
    
    printf("Closing device %s...\n", dev_name);
    flink_close(dev);
    
    return EXIT_SUCCESS;
}