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## Hurd-specific glibc API
These functions have meaning only under Hurd. They are needed to get port names that are used in native Hurd API (the RPC calls to servers). The `.defs` and `.h` files can be found in
`/include/hurd` when all development files are installed (Debian package `hurd-dev`.) Note that `.defs` are not included in C programs - they are used to produce `.h` files.
- file_t
- getcwdir (void);
- Get file_t port name of current working directory. See <hurd/fs.defs> and <hurd/fs.h>.
- int
- setcwdir (file_t);
- Set current working directory.
- file_t
- getcrdir (void);
- Get file_t port name of current root directory.
- int
- setcrdir (file_t);
- Set current root directory.
- file_t
- file_name_lookup (const char *file, int flags, mode_t mode);
- Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>). The file lookup uses the current root and working directory. Returns a port to the file if successful; otherwise sets errno and returns MACH_PORT_NULL.
- file_t
- file_name_lookup_under (file_t startdir, const char *file, int flags, mode_t mode);
- Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>). The file lookup uses the current root directory, but uses STARTDIR as the "working directory" for file relative names. Returns a port to the file if successful; otherwise sets errno and returns MACH_PORT_NULL.
- file_t
- file_name_path_lookup (const char *file_name, const char *path, int flags, mode_t mode, char **prefixed_name);
- Lookup FILE_NAME and return the node opened with FLAGS & MODE (see hurd_file_name_lookup for details), but a simple file name (without any directory prefixes) will be consecutively prefixed with the pathnames in the : separated list PATH until one succeeds in a successful lookup. If none succeed, then the first error that wasn't ENOENT is returned, or ENOENT if no other errors were returned. If PREFIXED_NAME is non-NULL, then if the result is looked up directly, *PREFIXED_NAME is set to NULL, and if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to malloc'd storage containing the prefixed name.
- file_t
- file_name_split (const char file, char **name);
- Split FILE into a directory and a name within the directory. The directory lookup uses the current root and working directory. If successful, stores in *NAME a pointer into FILE where the name within directory begins and returns a port to the directory; otherwise sets errno and returns MACH_PORT_NULL.
- file_t
- directory_name_split (const char *file, char **name);
- Split DIRECTORY into a parent directory and a name within the directory. This is the same as file_name_split, but ignores trailing slashes.
- FILE *
- fopenport (io_t port, const char *mode);
- Open a stream on a port. MODE is as for fopen. If successful, this consumes a user reference for PORT (which will be deallocated on fclose).
- int
- openport (io_t port, int flags);
- Open a file descriptor on a port. FLAGS are as for open; flags affected by io_set_openmodes are not changed by this. If successful, this consumes a user reference for PORT (which will be deallocated on close.) See <hurd/io.defs> and <hurd/io.h>.
- task_t
- pid2task (pid_t pid);
- Return the task control port of process PID. On error, sets errno and returns MACH_PORT_NULL.
- pid_t
- task2pid (task_t task);
- Return the PID of the task whose control port is TASK. On error, sets errno and returns -1.
- int
- geteuids (int n, uid_t *uidset);
- Get the effective UID set.
- int
- seteuids (int n, const uid_t *uidset);
- Set the effective UID set.
- auth_t
- getauth (void);
- Get port name of current authentication server. See <hurd/auth.defs> and <hurd/auth.h>.
- int
- setauth (auth_t);
- Set current authentication server.
- process_t
- getproc (void);
- Get port name of current process server. See <hurd/process.defs> and <hurd/process.h>.
- int
- setproc (process_t);
- Set current process server.
- mach_port_t
- getcttyid (void);
- Get the CTTY port.
- int
- setcttyid (mach_port_t);
- Set the CTTY port.
- kern_return_t
- get_privileged_ports (host_priv_t *host_priv_ptr, device_t *device_master_ptr);
- Fetch the host privileged port and device master port from the process server.
- mode_t
- getumask (void);
- Get the current `umask' value without changing it (this glibc functions is available only under GNU Hurd.)
- int
- vpprintf (io_t port, const char *format, va_list arg);
- Write formatted output to PORT, a Mach port supporting the i/o protocol, according to the format string FORMAT, using the argument list in ARG.
- thread_t
- hurd_thread_self (void);
- Return the current thread's thread port. This is a cheap operation (no system call), but it relies on Hurd signal state being set up.
- error_t
- hurd_thread_cancel (thread_t thread);
- Cancel pending operations on THREAD. If it is doing an interruptible RPC, that RPC will now return EINTR; otherwise, the "cancelled" flag will be set, causing the next hurd_check_cancel call to return nonzero or the next interruptible RPC to return EINTR (whichever is called first).
- int
- hurd_check_cancel (void);
- Test and clear the calling thread's "cancelled" flag.