#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) { errno = EINVAL; return -1; } if (uname(&uts) == -1) return -1; if (strlen(uts.nodename)+1 > len) { errno = EINVAL; return -1; } strcpy(name, uts.nodename); return 0; }