#include <sys/utsname.h>
#include <unistd.h>

int gethostname(char* name, size_t len) {
    size_t i;
    struct utsname uts;
    if (uname(&uts))
        return -1;
    if (len > sizeof uts.nodename)
        len = sizeof uts.nodename;
    for (i = 0; i < len && (name[i] = uts.nodename[i]); i++)
        ;
    if (i == len)
        name[i - 1] = 0;
    return 0;
}