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
  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
  80 /* Shorthand macro for internal library code referencing _hurd_ports (see
  81    <hurd/port.h>).  */
  82
  83 #define __USEPORT(which, expr) \
  84   HURD_PORT_USE (&_hurd_ports[INIT_PORT_##which], (expr))
  85
  86 /* Function version of __USEPORT: calls OPERATE with a send right.  */
  87
  88 extern error_t _hurd_ports_use (int which, error_t (*operate) (mach_port_t));
  89
  90
  91 /* Base address and size of the initial stack set up by the exec server.
  92    If using cthreads, this stack is deallocated in startup.
  93    Not locked.  */
  94
  95 extern vm_address_t _hurd_stack_base;
  96 extern vm_size_t _hurd_stack_size;
  97
  98 /* Initial file descriptor table we were passed at startup.  If we are
  99    using a real dtable, these are turned into that and then cleared at
 100    startup.  If not, these are never changed after startup.  Not locked.  */
 101
 102 extern mach_port_t *_hurd_init_dtable;
 103 extern mach_msg_type_number_t _hurd_init_dtablesize;
 104 \f
 105 /* Current process IDs.  */
 106
 107 extern pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
 108 extern int _hurd_orphaned;
 109
 110 /* This variable is incremented every time the process IDs change.  */
 111
 112 unsigned int _hurd_pids_changed_stamp;
 113
 114 /* This condition is broadcast every time the process IDs change.  */
 115 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 ();
 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 /* Split FILE into a directory and a name within the directory.  The
 159    directory lookup uses the current root and working directory.  If
 160    successful, stores in *NAME a pointer into FILE where the name
 161    within directory begins and returns a port to the directory;
 162    otherwise sets `errno' and returns MACH_PORT_NULL.  */
 163
 164 extern file_t __file_name_split (const char *file, char **name);
 165 extern file_t file_name_split (const char *file, char **name);
 166
 167 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
 168    The file lookup uses the current root and working directory.
 169    Returns a port to the file if successful; otherwise sets `errno'
 170    and returns MACH_PORT_NULL.  */
 171
 172 extern file_t __file_name_lookup (const char *file, int flags, mode_t mode);
 173 extern file_t file_name_lookup (const char *file, int flags, mode_t mode);
 174
 175 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).  The
 176    file lookup uses the current root directory, but uses STARTDIR as the
 177    "working directory" for file relative names.  Returns a port to the file
 178    if successful; otherwise sets `errno' and returns MACH_PORT_NULL.  */
 179
 180 extern file_t __file_name_lookup_under (file_t startdir, const char *file,
 181                                         int flags, mode_t mode);
 182 extern file_t file_name_lookup_under (file_t startdir, const char *file,
 183                                       int flags, mode_t mode);
 184
 185
 186 /* Open a file descriptor on a port.  FLAGS are as for `open'; flags
 187    affected by io_set_openmodes are not changed by this.  If successful,
 188    this consumes a user reference for PORT (which will be deallocated on
 189    close).  */
 190
 191 extern int openport (io_t port, int flags);
 192
 193 /* Open a stream on a port.  MODE is as for `fopen'.
 194    If successful, this consumes a user reference for PORT
 195    (which will be deallocated on fclose).  */
 196
 197 extern FILE *fopenport (io_t port, const char *mode);
 198 extern FILE *__fopenport (io_t port, const char *mode);
 199
 200
 201 /* Execute a file, replacing TASK's current program image.  */
 202
 203 extern error_t _hurd_exec (task_t task,
 204                            file_t file,
 205                            char *const argv[],
 206                            char *const envp[]);
 207
 208
 209 /* Inform the proc server we have exitted with STATUS, and kill the
 210    task thoroughly.  This function never returns, no matter what.  */
 211
 212 extern void _hurd_exit (int status) __attribute__ ((noreturn));
 213
 214
 215 /* Initialize the library data structures from the
 216    ints and ports passed to us by the exec server.
 217    Then vm_deallocate PORTARRAY and INTARRAY.  */
 218
 219 extern void _hurd_init (int flags, char **argv,
 220                         mach_port_t *portarray, size_t portarraysize,
 221                         int *intarray, size_t intarraysize);
 222
 223 /* Do startup handshaking with the proc server.  */
 224
 225 extern void _hurd_proc_init (char **argv);
 226
 227
 228 /* Return the socket server for sockaddr domain DOMAIN.  If DEAD is
 229    nonzero, remove the old cached port and always do a fresh lookup.
 230
 231    It is assumed that a socket server will stay alive during a complex socket
 232    operation involving several RPCs.  But a socket server may die during
 233    long idle periods between socket operations.  Callers should first pass
 234    zero for DEAD; if the first socket RPC tried on the returned port fails
 235    with MACH_SEND_INVALID_DEST or MIG_SERVER_DIED (indicating the server
 236    went away), the caller should call _hurd_socket_server again with DEAD
 237    nonzero and retry the RPC on the new socket server port.  */
 238
 239 extern socket_t _hurd_socket_server (int domain, int dead);
 240
 241 /* Send a `sig_post' RPC to process number PID.  If PID is zero,
 242    send the message to all processes in the current process's process group.
 243    If PID is < -1, send SIG to all processes in process group - PID.
 244    SIG and REFPORT are passed along in the request message.  */
 245
 246 extern error_t _hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 247 extern error_t hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 248
 249 /* Fetch the host privileged port and device master port from the proc
 250    server.  They are fetched only once and then cached in the
 251    variables below.  A special program that gets them from somewhere
 252    other than the proc server (such as a bootstrap filesystem) can set
 253    these variables to install the ports.  */
 254
 255 extern kern_return_t get_privileged_ports (host_priv_t *host_priv_ptr,
 256                                            device_t *device_master_ptr);
 257 extern mach_port_t _hurd_host_priv, _hurd_device_master;
 258
 259 /* Return the PID of the task whose control port is TASK.
 260    On error, sets `errno' and returns -1.  */
 261
 262 extern pid_t __task2pid (task_t task), task2pid (task_t task);
 263
 264 /* Return the task control port of process PID.
 265    On error, sets `errno' and returns MACH_PORT_NULL.  */
 266
 267 extern task_t __pid2task (pid_t pid), pid2task (pid_t pid);
 268
 269 /* Return the current thread's thread port.  This is a cheap operation (no
 270    system call), but it relies on Hurd signal state being set up.  */
 271 extern thread_t hurd_thread_self (void);
 272
 273
 274 /* Cancel pending operations on THREAD.  If it is doing an interruptible RPC,
 275    that RPC will now return EINTR; otherwise, the "cancelled" flag will be
 276    set, causing the next `hurd_check_cancel' call to return nonzero or the
 277    next interruptible RPC to return EINTR (whichever is called first).  */
 278 extern error_t hurd_thread_cancel (thread_t thread);
 279
 280 /* Test and clear the calling thread's "cancelled" flag.  */
 281 extern int hurd_check_cancel (void);
 282
 283
 284 /* Return the io server port for file descriptor FD.
 285    This adds a Mach user reference to the returned port.
 286    On error, sets `errno' and returns MACH_PORT_NULL.  */
 287
 288 extern io_t __getdport (int fd), getdport (int fd);
 289
 290
 291 #endif  /* hurd.h */