hurd/hurd.h

   1 /* Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #ifndef _HURD_H
  20
  21 #define _HURD_H 1
  22 #include <features.h>
  23
  24
  25 /* Get types, macros, constants and function declarations
  26    for all Mach microkernel interaction.  */
  27 #include <mach.h>
  28 #include <mach/mig_errors.h>
  29
  30 /* Get types and constants necessary for Hurd interfaces.  */
  31 #include <hurd/hurd_types.h>
  32
  33 /* Get MiG stub declarations for commonly used Hurd interfaces.  */
  34 #include <hurd/auth.h>
  35 #include <hurd/process.h>
  36 #include <hurd/fs.h>
  37 #include <hurd/io.h>
  38
  39 /* Get `struct hurd_port' and related definitions implementing lightweight
  40    user references for ports.  These are used pervasively throughout the C
  41    library; this is here to avoid putting it in nearly every source file.  */
  42 #include <hurd/port.h>
  43
  44 #include <errno.h>
  45 #define __hurd_fail(err)        (errno = (err), -1)
  46 \f
  47 /* Basic ports and info, initialized by startup.  */
  48
  49 extern int _hurd_exec_flags;    /* Flags word passed in exec_startup.  */
  50 extern struct hurd_port *_hurd_ports;
  51 extern unsigned int _hurd_nports;
  52 extern volatile mode_t _hurd_umask;
  53
  54 /* Shorthand macro for referencing _hurd_ports (see <hurd/port.h>).  */
  55
  56 #define __USEPORT(which, expr) \
  57   HURD_PORT_USE (&_hurd_ports[INIT_PORT_##which], (expr))
  58
  59
  60 /* Base address and size of the initial stack set up by the exec server.
  61    If using cthreads, this stack is deallocated in startup.
  62    Not locked.  */
  63
  64 extern vm_address_t _hurd_stack_base;
  65 extern vm_size_t _hurd_stack_size;
  66
  67 /* Initial file descriptor table we were passed at startup.  If we are
  68    using a real dtable, these are turned into that and then cleared at
  69    startup.  If not, these are never changed after startup.  Not locked.  */
  70
  71 extern mach_port_t *_hurd_init_dtable;
  72 extern mach_msg_type_number_t _hurd_init_dtablesize;
  73 \f
  74 /* Current process IDs.  */
  75
  76 extern pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
  77 extern int _hurd_orphaned;
  78
  79 /* This variable is incremented every time the process IDs change.  */
  80
  81 unsigned int _hurd_pids_changed_stamp;
  82
  83 /* This condition is broadcast every time the process IDs change.  */
  84 struct condition _hurd_pids_changed_sync;
  85 \f
  86 /* Unix `data break', for brk and sbrk.
  87    If brk and sbrk are not used, this info will not be initialized or used.  */
  88
  89
  90 /* Data break.  This is what `sbrk (0)' returns.  */
  91
  92 extern vm_address_t _hurd_brk;
  93
  94 /* End of allocated space.  This is generally `round_page (_hurd_brk)'.  */
  95
  96 extern vm_address_t _hurd_data_end;
  97
  98 /* This mutex locks _hurd_brk and _hurd_data_end.  */
  99
 100 extern struct mutex _hurd_brk_lock;
 101
 102 /* Set the data break to NEWBRK; _hurd_brk_lock must
 103    be held, and is released on return.  */
 104
 105 extern int _hurd_set_brk (vm_address_t newbrk);
 106 \f
 107 #define __need_FILE
 108 #include <stdio.h>
 109
 110 /* Calls to get and set basic ports.  */
 111
 112 extern error_t _hurd_ports_get (int which, mach_port_t *result);
 113 extern error_t _hurd_ports_set (int which, mach_port_t newport);
 114
 115 extern process_t getproc (void);
 116 extern file_t getcwdir (void), getcrdir (void);
 117 extern auth_t getauth (void);
 118 extern mach_port_t getcttyid ();
 119 extern int setproc (process_t);
 120 extern int setcwdir (file_t), setcrdir (file_t);
 121 extern int setcttyid (mach_port_t);
 122
 123 /* Does reauth with the proc server and fd io servers.  */
 124 extern int __setauth (auth_t), setauth (auth_t);
 125
 126
 127 /* Split FILE into a directory and a name within the directory.  Look up a
 128    port for the directory and store it in *DIR; store in *NAME a pointer
 129    into FILE where the name within directory begins.  The directory lookup
 130    uses CRDIR for the root directory and CWDIR for the current directory.
 131    Returns zero on success or an error code.  */
 132
 133 extern error_t __hurd_file_name_split (file_t crdir, file_t cwdir,
 134                                        const char *file,
 135                                        file_t *dir, char **name);
 136 extern error_t hurd_file_name_split (file_t crdir, file_t cwdir,
 137                                      const char *file,
 138                                      file_t *dir, char **name);
 139
 140 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
 141    The file lookup uses CRDIR for the root directory and CWDIR for the
 142    current directory.  If successful, returns zero and store the port
 143    to FILE in *PORT; otherwise returns an error code. */
 144
 145 extern error_t __hurd_file_name_lookup (file_t crdir, file_t cwdir,
 146                                         const char *file,
 147                                         int flags, mode_t mode,
 148                                         file_t *port);
 149 extern error_t hurd_file_name_lookup (file_t crdir, file_t cwdir,
 150                                       const char *filename,
 151                                       int flags, mode_t mode,
 152                                       file_t *port);
 153
 154 /* Process the values returned by `dir_lookup' et al, and loop doing
 155    `dir_lookup' calls until one returns FS_RETRY_NONE.  CRDIR is the
 156    root directory used for things like symlinks to absolute file names; the
 157    other arguments should be those just passed to and/or returned from
 158    `dir_lookup', `fsys_getroot', or `file_invoke_translator'.  This
 159    function consumes the reference in *RESULT even if it returns an error.  */
 160
 161 extern error_t __hurd_file_name_lookup_retry (file_t crdir,
 162                                               enum retry_type doretry,
 163                                               char retryname[1024],
 164                                               int flags, mode_t mode,
 165                                               file_t *result);
 166 extern error_t hurd_file_name_lookup_retry (file_t crdir,
 167                                             enum retry_type doretry,
 168                                             char retryname[1024],
 169                                             int flags, mode_t mode,
 170                                             file_t *result);
 171
 172
 173 /* Split FILE into a directory and a name within the directory.  The
 174    directory lookup uses the current root and working directory.  If
 175    successful, stores in *NAME a pointer into FILE where the name
 176    within directory begins and returns a port to the directory;
 177    otherwise sets `errno' and returns MACH_PORT_NULL.  */
 178
 179 extern file_t __file_name_split (const char *file, char **name);
 180 extern file_t file_name_split (const char *file, char **name);
 181
 182 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
 183    The file lookup uses the current root and working directory.
 184    Returns a port to the file if successful; otherwise sets `errno'
 185    and returns MACH_PORT_NULL.  */
 186
 187 extern file_t __file_name_lookup (const char *file, int flags, mode_t mode);
 188 extern file_t file_name_lookup (const char *file, int flags, mode_t mode);
 189
 190 /* Invoke any translator set on the node FILE represents, and return in
 191    *TRANSLATED a port to the translated node.  FLAGS are as for
 192    `dir_lookup' et al, but the returned port will not necessarily have
 193    any more access rights than FILE does.  */
 194
 195 extern error_t __hurd_invoke_translator (file_t file, int flags,
 196                                          file_t *translated);
 197 extern error_t hurd_invoke_translator (file_t file, int flags,
 198                                        file_t *translated);
 199
 200
 201 /* Open a file descriptor on a port.  FLAGS are as for `open'; flags
 202    affected by io_set_openmodes are not changed by this.  If successful,
 203    this consumes a user reference for PORT (which will be deallocated on
 204    close).  */
 205
 206 extern int openport (io_t port, int flags);
 207
 208 /* Open a stream on a port.  MODE is as for `fopen'.
 209    If successful, this consumes a user reference for PORT
 210    (which will be deallocated on fclose).  */
 211
 212 extern FILE *fopenport (io_t port, const char *mode);
 213 extern FILE *__fopenport (io_t port, const char *mode);
 214
 215
 216 /* Execute a file, replacing TASK's current program image.  */
 217
 218 extern error_t _hurd_exec (task_t task,
 219                            file_t file,
 220                            char *const argv[],
 221                            char *const envp[]);
 222
 223
 224 /* Inform the proc server we have exitted with STATUS, and kill the
 225    task thoroughly.  This function never returns, no matter what.  */
 226
 227 extern void _hurd_exit (int status) __attribute__ ((noreturn));
 228
 229
 230 /* Initialize the library data structures from the
 231    ints and ports passed to us by the exec server.
 232    Then vm_deallocate PORTARRAY and INTARRAY.  */
 233
 234 extern void _hurd_init (int flags, char **argv,
 235                         mach_port_t *portarray, size_t portarraysize,
 236                         int *intarray, size_t intarraysize);
 237
 238 /* Do startup handshaking with the proc server.  */
 239
 240 extern void _hurd_proc_init (char **argv);
 241
 242
 243 /* Return the socket server for sockaddr domain DOMAIN.  If DEAD is
 244    nonzero, remove the old cached port and always do a fresh lookup.
 245
 246    It is assumed that a socket server will stay alive during a complex socket
 247    operation involving several RPCs.  But a socket server may die during
 248    long idle periods between socket operations.  Callers should first pass
 249    zero for DEAD; if the first socket RPC tried on the returned port fails
 250    with MACH_SEND_INVALID_DEST or MIG_SERVER_DIED (indicating the server
 251    went away), the caller should call _hurd_socket_server again with DEAD
 252    nonzero and retry the RPC on the new socket server port.  */
 253
 254 extern socket_t _hurd_socket_server (int domain, int dead);
 255
 256 /* Send a `sig_post' RPC to process number PID.  If PID is zero,
 257    send the message to all processes in the current process's process group.
 258    If PID is < -1, send SIG to all processes in process group - PID.
 259    SIG and REFPORT are passed along in the request message.  */
 260
 261 extern error_t _hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 262 extern error_t hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 263
 264 /* Fetch the host privileged port and device master port from the proc
 265    server.  They are fetched only once and then cached in the
 266    variables below.  A special program that gets them from somewhere
 267    other than the proc server (such as a bootstrap filesystem) can set
 268    these variables to install the ports.  */
 269
 270 extern kern_return_t get_privileged_ports (host_priv_t *host_priv_ptr,
 271                                            device_t *device_master_ptr);
 272 extern mach_port_t _hurd_host_priv, _hurd_device_master;
 273
 274 /* Return the PID of the task whose control port is TASK.
 275    On error, sets `errno' and returns -1.  */
 276
 277 extern pid_t __task2pid (task_t task), task2pid (task_t task);
 278
 279 /* Return the task control port of process PID.
 280    On error, sets `errno' and returns MACH_PORT_NULL.  */
 281
 282 extern task_t __pid2task (pid_t pid), pid2task (pid_t pid);
 283
 284
 285 /* Return the io server port for file descriptor FD.
 286    This adds a Mach user reference to the returned port.
 287    On error, sets `errno' and returns MACH_PORT_NULL.  */
 288
 289 extern io_t __getdport (int fd), getdport (int fd);
 290
 291
 292 #endif  /* hurd.h */