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#include <string.h>
#include <unistd.h>
#include <sys/utsname.h>
#include <errno.h>
 
int
gethostname(char *name, size_t len)
{
  struct utsname uts;
 
  if (name == NULL) {
    __set_errno(EINVAL);
    return -1;
  }
 
  if (uname(&uts) == -1) return -1;
 
  if (strlen(uts.nodename)+1 > len) {
    __set_errno(EINVAL);
    return -1;
  }
  strcpy(name, uts.nodename);
  return 0;
}