Notes

The library pays attention to some envariables:

CORESERVER     -- Name of core server naming point; falls back to /servers/core
COREFILE       -- Name of file to write core dump in; falls back to core
GNUTARGET      -- Passed to core server to specify flavor of core dump format

New functions:

int openport (io_t port);
FILE *fopenport (mach_port_t, const char *mode);
file_t getdport (int fd);

task_t pid2task (pid_t);
pid_t task2pid (task_t);

int fchroot (int fd);
mode_t getumask (void);

int getuids (int n, uid_t *uidset);

error_t hurd_path_lookup (file_t root, file_t cwd,
			  const char *path, int flags, mode_t mode,
			  file_t *port);
error_t hurd_path_split (file_t root, file_t cwd,
			 const char *path,
			 file_t *dir, char **name);
file_t path_lookup (const char *path, int flags, mode_t mode);
file_t path_split (const char *path, char **name);

process_t getproc (void);
int setproc (process_t);
file_t getcrdir (void);
int setcrdir (file_t);
file_t getcwdir (void);
int setcwdir (file_t);
auth_t getauth (void);
int setauth (auth_t);		/* Reauthenticates all library ports.  */