1: The library pays attention to some envariables:
    2: 
    3: CORESERVER     -- Name of core server naming point; falls back to /servers/core
    4: COREFILE       -- Name of file to write core dump in; falls back to core
    5: GNUTARGET      -- Passed to core server to specify flavor of core dump format
    6: 
    7: New functions:
    8: 
    9: int openport (io_t port);
   10: FILE *fopenport (mach_port_t, const char *mode);
   11: file_t getdport (int fd);
   12: 
   13: task_t pid2task (pid_t);
   14: pid_t task2pid (task_t);
   15: 
   16: int fchroot (int fd);
   17: mode_t getumask (void);
   18: 
   19: int getuids (int n, uid_t *uidset);
   20: 
   21: error_t hurd_path_lookup (file_t root, file_t cwd,
   22:                           const char *path, int flags, mode_t mode,
   23:                           file_t *port);
   24: error_t hurd_path_split (file_t root, file_t cwd,
   25:                          const char *path,
   26:                          file_t *dir, char **name);
   27: file_t path_lookup (const char *path, int flags, mode_t mode);
   28: file_t path_split (const char *path, char **name);
   29: 
   30: process_t getproc (void);
   31: int setproc (process_t);
   32: file_t getcrdir (void);
   33: int setcrdir (file_t);
   34: file_t getcwdir (void);
   35: int setcwdir (file_t);
   36: auth_t getauth (void);
   37: int setauth (auth_t);           /* Reauthenticates all library ports.  */