gethostbyname() 中的资源暂时不可用

Question

I was writing my first client in C when I reached the point where I have to send a socket to the server. When i try to get its address I get a

Resource temporarily unavailable

and I can't find what is causing this problem.

dadesSoftConfig->ipServer has inside localhost

    struct hostent *ent;

    ent = gethostbyname(dadesSoftConfig->ipServidor);
    if (ent == NULL) {
        int errnum = errno;
        fprintf(stderr, "Client finalitzat: %s\n", strerror(errnum));
        exit(EXIT_FAILURE);
    }

I do not send any socket, wait for any data yet when I do this call , this is happening at the very beginning, even before the register phase of my protocol.

As requested, this is a print of the dadesSoftConfig:

DEBUG_INFO:     Nom: SW-01
                Mac: 89F107457A36
                Server: localhost
                Server-port: 2019

And this is how I print it:

void print_software_configuration(TDadesSoftConfig *dades) {
    char *msg;
    msg = (char *) malloc(sizeof(char) * 75);
    if (sprintf(msg, "\tNom: %s \t\tMac: %s \t\tServer: %s \t\tServer-port: %d\n", 
                dades->nom, dades->mac, dades->ipServidor, dades->serverPort) < 0) {
        fprintf(stderr, "No s'ha pogut mostrar el contingut llegit\n");
    } else {
        print_debug_info(msg);
    }
    free(msg);
}

I tried sending "127.0.0.1" to gethostbyname() function and the code perfectly works, even when I store it to my struct. Any idea why it doesn't work when sending "localhost"?

Answer 1

As pointed by my prints, the data structure was correct, but the data it contained was not. Info should be displayed separated by \\t\\t not a \\n\\t\\t.

The problem was solved when setting correctly the delimiters to strtok() function which parses the input.