hurd/hurd.h

   1 /* Copyright (C) 1993,94,95,96,97,98,99,2001 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, 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
  46 _EXTERN_INLINE int
  47 __hurd_fail (error_t err)
  48 {
  49   switch (err)
  50     {
  51     case EMACH_SEND_INVALID_DEST:
  52     case EMIG_SERVER_DIED:
  53       /* The server has disappeared!  */
  54       err = EIEIO;
  55       break;
  56
  57     case KERN_NO_SPACE:
  58       err = ENOMEM;
  59       break;
  60     case KERN_INVALID_ARGUMENT:
  61       err = EINVAL;
  62       break;
  63
  64     case 0:
  65       return 0;
  66     default:
  67     }
  68
  69   errno = err;
  70   return -1;
  71 }
  72 \f
  73 /* Basic ports and info, initialized by startup.  */
  74
  75 extern int _hurd_exec_flags;    /* Flags word passed in exec_startup.  */
  76 extern struct hurd_port *_hurd_ports;
  77 extern unsigned int _hurd_nports;
  78 extern volatile mode_t _hurd_umask;
  79 extern sigset_t _hurdsig_traced;
  80
  81 /* Shorthand macro for internal library code referencing _hurd_ports (see
  82    <hurd/port.h>).  */
  83
  84 #define __USEPORT(which, expr) \
  85   HURD_PORT_USE (&_hurd_ports[INIT_PORT_##which], (expr))
  86
  87 /* Function version of __USEPORT: calls OPERATE with a send right.  */
  88
  89 extern error_t _hurd_ports_use (int which, error_t (*operate) (mach_port_t));
  90
  91
  92 /* Base address and size of the initial stack set up by the exec server.
  93    If using cthreads, this stack is deallocated in startup.
  94    Not locked.  */
  95
  96 extern vm_address_t _hurd_stack_base;
  97 extern vm_size_t _hurd_stack_size;
  98
  99 /* Initial file descriptor table we were passed at startup.  If we are
 100    using a real dtable, these are turned into that and then cleared at
 101    startup.  If not, these are never changed after startup.  Not locked.  */
 102
 103 extern mach_port_t *_hurd_init_dtable;
 104 extern mach_msg_type_number_t _hurd_init_dtablesize;
 105 \f
 106 /* Current process IDs.  */
 107
 108 extern pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
 109 extern int _hurd_orphaned;
 110
 111 /* This variable is incremented every time the process IDs change.  */
 112 extern unsigned int _hurd_pids_changed_stamp;
 113
 114 /* This condition is broadcast every time the process IDs change.  */
 115 extern struct condition _hurd_pids_changed_sync;
 116 \f
 117 /* Unix `data break', for brk and sbrk.
 118    If brk and sbrk are not used, this info will not be initialized or used.  */
 119
 120
 121 /* Data break.  This is what `sbrk (0)' returns.  */
 122
 123 extern vm_address_t _hurd_brk;
 124
 125 /* End of allocated space.  This is generally `round_page (_hurd_brk)'.  */
 126
 127 extern vm_address_t _hurd_data_end;
 128
 129 /* This mutex locks _hurd_brk and _hurd_data_end.  */
 130
 131 extern struct mutex _hurd_brk_lock;
 132
 133 /* Set the data break to NEWBRK; _hurd_brk_lock must
 134    be held, and is released on return.  */
 135
 136 extern int _hurd_set_brk (vm_address_t newbrk);
 137 \f
 138 #define __need_FILE
 139 #include <stdio.h>
 140
 141 /* Calls to get and set basic ports.  */
 142
 143 extern error_t _hurd_ports_get (unsigned int which, mach_port_t *result);
 144 extern error_t _hurd_ports_set (unsigned int which, mach_port_t newport);
 145
 146 extern process_t getproc (void);
 147 extern file_t getcwdir (void), getcrdir (void);
 148 extern auth_t getauth (void);
 149 extern mach_port_t getcttyid (void);
 150 extern int setproc (process_t);
 151 extern int setcwdir (file_t), setcrdir (file_t);
 152 extern int setcttyid (mach_port_t);
 153
 154 /* Does reauth with the proc server and fd io servers.  */
 155 extern int __setauth (auth_t), setauth (auth_t);
 156
 157
 158 /* Modify a port cell by looking up a directory name.
 159    This verifies that it is a directory and that we have search permission.  */
 160 extern int _hurd_change_directory_port_from_name (struct hurd_port *portcell,
 161                                                   const char *name);
 162 /* Same thing, but using an open file descriptor.
 163    Also verifies that it is a directory and that we have search permission.  */
 164 extern int _hurd_change_directory_port_from_fd (struct hurd_port *portcell,
 165                                                 int fd);
 166
 167
 168
 169 /* Get and set the effective UID set.  */
 170 extern int geteuids (int __n, uid_t *__uidset);
 171 extern int seteuids (int __n, const uid_t *__uidset);
 172
 173
 174 /* Split FILE into a directory and a name within the directory.  The
 175    directory lookup uses the current root and working directory.  If
 176    successful, stores in *NAME a pointer into FILE where the name
 177    within directory begins and returns a port to the directory;
 178    otherwise sets `errno' and returns MACH_PORT_NULL.  */
 179
 180 extern file_t __file_name_split (const char *file, char **name);
 181 extern file_t file_name_split (const char *file, char **name);
 182
 183 /* Split DIRECTORY into a parent directory and a name within the directory.
 184    This is the same as file_name_split, but ignores trailing slashes.  */
 185
 186 extern file_t __directory_name_split (const char *file, char **name);
 187 extern file_t directory_name_split (const char *file, char **name);
 188
 189 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
 190    The file lookup uses the current root and working directory.
 191    Returns a port to the file if successful; otherwise sets `errno'
 192    and returns MACH_PORT_NULL.  */
 193
 194 extern file_t __file_name_lookup (const char *file, int flags, mode_t mode);
 195 extern file_t file_name_lookup (const char *file, int flags, mode_t mode);
 196
 197 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).  The
 198    file lookup uses the current root directory, but uses STARTDIR as the
 199    "working directory" for file relative names.  Returns a port to the file
 200    if successful; otherwise sets `errno' and returns MACH_PORT_NULL.  */
 201
 202 extern file_t __file_name_lookup_under (file_t startdir, const char *file,
 203                                         int flags, mode_t mode);
 204 extern file_t file_name_lookup_under (file_t startdir, const char *file,
 205                                       int flags, mode_t mode);
 206
 207
 208 /* Lookup FILE_NAME and return the node opened with FLAGS & MODE
 209    (see hurd_file_name_lookup for details), but a simple file name (without
 210    any directory prefixes) will be consecutively prefixed with the pathnames
 211    in the `:' separated list PATH until one succeeds in a successful lookup.
 212    If none succeed, then the first error that wasn't ENOENT is returned, or
 213    ENOENT if no other errors were returned.  If PREFIXED_NAME is non-NULL,
 214    then if the result is looked up directly, *PREFIXED_NAME is set to NULL, and
 215    if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to
 216    malloc'd storage containing the prefixed name.  */
 217 extern file_t file_name_path_lookup (const char *file_name, const char *path,
 218                                      int flags, mode_t mode,
 219                                      char **prefixed_name);
 220
 221
 222
 223 /* Open a file descriptor on a port.  FLAGS are as for `open'; flags
 224    affected by io_set_openmodes are not changed by this.  If successful,
 225    this consumes a user reference for PORT (which will be deallocated on
 226    close).  */
 227
 228 extern int openport (io_t port, int flags);
 229
 230 /* Open a stream on a port.  MODE is as for `fopen'.
 231    If successful, this consumes a user reference for PORT
 232    (which will be deallocated on fclose).  */
 233
 234 extern FILE *fopenport (io_t port, const char *mode);
 235 extern FILE *__fopenport (io_t port, const char *mode);
 236
 237
 238 /* Execute a file, replacing TASK's current program image.  */
 239
 240 extern error_t _hurd_exec (task_t task,
 241                            file_t file,
 242                            char *const argv[],
 243                            char *const envp[]);
 244
 245
 246 /* Inform the proc server we have exited with STATUS, and kill the
 247    task thoroughly.  This function never returns, no matter what.  */
 248
 249 extern void _hurd_exit (int status) __attribute__ ((noreturn));
 250
 251
 252 /* Initialize the library data structures from the
 253    ints and ports passed to us by the exec server.
 254    Then vm_deallocate PORTARRAY and INTARRAY.  */
 255
 256 extern void _hurd_init (int flags, char **argv,
 257                         mach_port_t *portarray, size_t portarraysize,
 258                         int *intarray, size_t intarraysize);
 259
 260 /* Do startup handshaking with the proc server, and initialize library data
 261    structures that require proc server interaction.  This includes
 262    initializing signals; see _hurdsig_init in <hurd/signal.h>.  */
 263
 264 extern void _hurd_proc_init (char **argv,
 265                              const int *intarray, size_t intarraysize);
 266
 267
 268 /* Return the socket server for sockaddr domain DOMAIN.  If DEAD is
 269    nonzero, remove the old cached port and always do a fresh lookup.
 270
 271    It is assumed that a socket server will stay alive during a complex socket
 272    operation involving several RPCs.  But a socket server may die during
 273    long idle periods between socket operations.  Callers should first pass
 274    zero for DEAD; if the first socket RPC tried on the returned port fails
 275    with MACH_SEND_INVALID_DEST or MIG_SERVER_DIED (indicating the server
 276    went away), the caller should call _hurd_socket_server again with DEAD
 277    nonzero and retry the RPC on the new socket server port.  */
 278
 279 extern socket_t _hurd_socket_server (int domain, int dead);
 280
 281 /* Send a `sig_post' RPC to process number PID.  If PID is zero,
 282    send the message to all processes in the current process's process group.
 283    If PID is < -1, send SIG to all processes in process group - PID.
 284    SIG and REFPORT are passed along in the request message.  */
 285
 286 extern error_t _hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 287 extern error_t hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 288
 289 /* Fetch the host privileged port and device master port from the proc
 290    server.  They are fetched only once and then cached in the
 291    variables below.  A special program that gets them from somewhere
 292    other than the proc server (such as a bootstrap filesystem) can set
 293    these variables to install the ports.  */
 294
 295 extern kern_return_t __get_privileged_ports (host_priv_t *host_priv_ptr,
 296                                              device_t *device_master_ptr);
 297 extern kern_return_t get_privileged_ports (host_priv_t *host_priv_ptr,
 298                                            device_t *device_master_ptr);
 299 extern mach_port_t _hurd_host_priv, _hurd_device_master;
 300
 301 /* Return the PID of the task whose control port is TASK.
 302    On error, sets `errno' and returns -1.  */
 303
 304 extern pid_t __task2pid (task_t task), task2pid (task_t task);
 305
 306 /* Return the task control port of process PID.
 307    On error, sets `errno' and returns MACH_PORT_NULL.  */
 308
 309 extern task_t __pid2task (pid_t pid), pid2task (pid_t pid);
 310
 311 /* Return the current thread's thread port.  This is a cheap operation (no
 312    system call), but it relies on Hurd signal state being set up.  */
 313 extern thread_t hurd_thread_self (void);
 314
 315
 316 /* Cancel pending operations on THREAD.  If it is doing an interruptible RPC,
 317    that RPC will now return EINTR; otherwise, the "cancelled" flag will be
 318    set, causing the next `hurd_check_cancel' call to return nonzero or the
 319    next interruptible RPC to return EINTR (whichever is called first).  */
 320 extern error_t hurd_thread_cancel (thread_t thread);
 321
 322 /* Test and clear the calling thread's "cancelled" flag.  */
 323 extern int hurd_check_cancel (void);
 324
 325
 326 /* Return the io server port for file descriptor FD.
 327    This adds a Mach user reference to the returned port.
 328    On error, sets `errno' and returns MACH_PORT_NULL.  */
 329
 330 extern io_t __getdport (int fd), getdport (int fd);
 331
 332
 333 #include <stdarg.h>
 334
 335 /* Write formatted output to PORT, a Mach port supporting the i/o protocol,
 336    according to the format string FORMAT, using the argument list in ARG.  */
 337 int vpprintf (io_t port, const char *format, va_list arg);
 338
 339
 340 #endif  /* hurd.h */