hurd/hurd.h

   1 /* Copyright (C) 1993,94,95,96,97,98,99,2001,2002,2007
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _HURD_H
  21
  22 #define _HURD_H 1
  23 #include <features.h>
  24
  25
  26 /* Get types, macros, constants and function declarations
  27    for all Mach microkernel interaction.  */
  28 #include <mach.h>
  29 #include <mach/mig_errors.h>
  30
  31 /* Get types and constants necessary for Hurd interfaces.  */
  32 #include <hurd/hurd_types.h>
  33
  34 /* Get MiG stub declarations for commonly used Hurd interfaces.  */
  35 #include <hurd/auth.h>
  36 #include <hurd/process.h>
  37 #include <hurd/fs.h>
  38 #include <hurd/io.h>
  39
  40 /* Get `struct hurd_port' and related definitions implementing lightweight
  41    user references for ports.  These are used pervasively throughout the C
  42    library; this is here to avoid putting it in nearly every source file.  */
  43 #include <hurd/port.h>
  44
  45 #include <errno.h>
  46
  47 #ifndef _HURD_H_EXTERN_INLINE
  48 #define _HURD_H_EXTERN_INLINE __extern_inline
  49 #endif
  50
  51 _HURD_H_EXTERN_INLINE int
  52 __hurd_fail (error_t err)
  53 {
  54   switch (err)
  55     {
  56     case EMACH_SEND_INVALID_DEST:
  57     case EMIG_SERVER_DIED:
  58       /* The server has disappeared!  */
  59       err = EIEIO;
  60       break;
  61
  62     case KERN_NO_SPACE:
  63       err = ENOMEM;
  64       break;
  65
  66     case KERN_INVALID_ARGUMENT:
  67       err = EINVAL;
  68       break;
  69
  70     case 0:
  71       return 0;
  72
  73     default:
  74       break;
  75     }
  76
  77   errno = err;
  78   return -1;
  79 }
  80 \f
  81 /* Basic ports and info, initialized by startup.  */
  82
  83 extern int _hurd_exec_flags;    /* Flags word passed in exec_startup.  */
  84 extern struct hurd_port *_hurd_ports;
  85 extern unsigned int _hurd_nports;
  86 extern mode_t _hurd_umask;
  87 extern sigset_t _hurdsig_traced;
  88
  89 /* Shorthand macro for internal library code referencing _hurd_ports (see
  90    <hurd/port.h>).  */
  91
  92 #define __USEPORT(which, expr) \
  93   HURD_PORT_USE (&_hurd_ports[INIT_PORT_##which], (expr))
  94
  95 /* Function version of __USEPORT: calls OPERATE with a send right.  */
  96
  97 extern error_t _hurd_ports_use (int which, error_t (*operate) (mach_port_t));
  98
  99
 100 /* Base address and size of the initial stack set up by the exec server.
 101    If using cthreads, this stack is deallocated in startup.
 102    Not locked.  */
 103
 104 extern vm_address_t _hurd_stack_base;
 105 extern vm_size_t _hurd_stack_size;
 106
 107 /* Initial file descriptor table we were passed at startup.  If we are
 108    using a real dtable, these are turned into that and then cleared at
 109    startup.  If not, these are never changed after startup.  Not locked.  */
 110
 111 extern mach_port_t *_hurd_init_dtable;
 112 extern mach_msg_type_number_t _hurd_init_dtablesize;
 113 \f
 114 /* Current process IDs.  */
 115
 116 extern pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
 117 extern int _hurd_orphaned;
 118
 119 /* This variable is incremented every time the process IDs change.  */
 120 extern unsigned int _hurd_pids_changed_stamp;
 121
 122 /* This condition is broadcast every time the process IDs change.  */
 123 extern struct condition _hurd_pids_changed_sync;
 124 \f
 125 /* Unix `data break', for brk and sbrk.
 126    If brk and sbrk are not used, this info will not be initialized or used.  */
 127
 128
 129 /* Data break.  This is what `sbrk (0)' returns.  */
 130
 131 extern vm_address_t _hurd_brk;
 132
 133 /* End of allocated space.  This is generally `round_page (_hurd_brk)'.  */
 134
 135 extern vm_address_t _hurd_data_end;
 136
 137 /* This mutex locks _hurd_brk and _hurd_data_end.  */
 138
 139 extern struct mutex _hurd_brk_lock;
 140
 141 /* Set the data break to NEWBRK; _hurd_brk_lock must
 142    be held, and is released on return.  */
 143
 144 extern int _hurd_set_brk (vm_address_t newbrk);
 145 \f
 146 #define __need_FILE
 147 #include <stdio.h>
 148
 149 /* Calls to get and set basic ports.  */
 150
 151 extern error_t _hurd_ports_get (unsigned int which, mach_port_t *result);
 152 extern error_t _hurd_ports_set (unsigned int which, mach_port_t newport);
 153
 154 extern process_t getproc (void);
 155 extern file_t getcwdir (void), getcrdir (void);
 156 extern auth_t getauth (void);
 157 extern mach_port_t getcttyid (void);
 158 extern int setproc (process_t);
 159 extern int setcwdir (file_t), setcrdir (file_t);
 160 extern int setcttyid (mach_port_t);
 161
 162 /* Does reauth with the proc server and fd io servers.  */
 163 extern int __setauth (auth_t), setauth (auth_t);
 164
 165
 166 /* Modify a port cell by looking up a directory name.
 167    This verifies that it is a directory and that we have search permission.  */
 168 extern int _hurd_change_directory_port_from_name (struct hurd_port *portcell,
 169                                                   const char *name);
 170 /* Same thing, but using an open file descriptor.
 171    Also verifies that it is a directory and that we have search permission.  */
 172 extern int _hurd_change_directory_port_from_fd (struct hurd_port *portcell,
 173                                                 int fd);
 174
 175
 176
 177 /* Get and set the effective UID set.  */
 178 extern int geteuids (int __n, uid_t *__uidset);
 179 extern int seteuids (int __n, const uid_t *__uidset);
 180
 181
 182 /* Split FILE into a directory and a name within the directory.  The
 183    directory lookup uses the current root and working directory.  If
 184    successful, stores in *NAME a pointer into FILE where the name
 185    within directory begins and returns a port to the directory;
 186    otherwise sets `errno' and returns MACH_PORT_NULL.  */
 187
 188 extern file_t __file_name_split (const char *file, char **name);
 189 extern file_t file_name_split (const char *file, char **name);
 190
 191 /* Split DIRECTORY into a parent directory and a name within the directory.
 192    This is the same as file_name_split, but ignores trailing slashes.  */
 193
 194 extern file_t __directory_name_split (const char *file, char **name);
 195 extern file_t directory_name_split (const char *file, char **name);
 196
 197 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
 198    The file lookup uses the current root and working directory.
 199    Returns a port to the file if successful; otherwise sets `errno'
 200    and returns MACH_PORT_NULL.  */
 201
 202 extern file_t __file_name_lookup (const char *file, int flags, mode_t mode);
 203 extern file_t file_name_lookup (const char *file, int flags, mode_t mode);
 204
 205 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).  The
 206    file lookup uses the current root directory, but uses STARTDIR as the
 207    "working directory" for file relative names.  Returns a port to the file
 208    if successful; otherwise sets `errno' and returns MACH_PORT_NULL.  */
 209
 210 extern file_t __file_name_lookup_under (file_t startdir, const char *file,
 211                                         int flags, mode_t mode);
 212 extern file_t file_name_lookup_under (file_t startdir, const char *file,
 213                                       int flags, mode_t mode);
 214
 215
 216 /* Lookup FILE_NAME and return the node opened with FLAGS & MODE
 217    (see hurd_file_name_lookup for details), but a simple file name (without
 218    any directory prefixes) will be consecutively prefixed with the pathnames
 219    in the `:' separated list PATH until one succeeds in a successful lookup.
 220    If none succeed, then the first error that wasn't ENOENT is returned, or
 221    ENOENT if no other errors were returned.  If PREFIXED_NAME is non-NULL,
 222    then if the result is looked up directly, *PREFIXED_NAME is set to NULL, and
 223    if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to
 224    malloc'd storage containing the prefixed name.  */
 225 extern file_t file_name_path_lookup (const char *file_name, const char *path,
 226                                      int flags, mode_t mode,
 227                                      char **prefixed_name);
 228
 229
 230
 231 /* Open a file descriptor on a port.  FLAGS are as for `open'; flags
 232    affected by io_set_openmodes are not changed by this.  If successful,
 233    this consumes a user reference for PORT (which will be deallocated on
 234    close).  */
 235
 236 extern int openport (io_t port, int flags);
 237
 238 /* Open a stream on a port.  MODE is as for `fopen'.
 239    If successful, this consumes a user reference for PORT
 240    (which will be deallocated on fclose).  */
 241
 242 extern FILE *fopenport (io_t port, const char *mode);
 243 extern FILE *__fopenport (io_t port, const char *mode);
 244
 245
 246 /* Execute a file, replacing TASK's current program image.  */
 247
 248 extern error_t _hurd_exec (task_t task,
 249                            file_t file,
 250                            char *const argv[],
 251                            char *const envp[]);
 252
 253
 254 /* Inform the proc server we have exited with STATUS, and kill the
 255    task thoroughly.  This function never returns, no matter what.  */
 256
 257 extern void _hurd_exit (int status) __attribute__ ((noreturn));
 258
 259
 260 /* Initialize the library data structures from the
 261    ints and ports passed to us by the exec server.
 262    Then vm_deallocate PORTARRAY and INTARRAY.  */
 263
 264 extern void _hurd_init (int flags, char **argv,
 265                         mach_port_t *portarray, size_t portarraysize,
 266                         int *intarray, size_t intarraysize);
 267
 268 /* Do startup handshaking with the proc server, and initialize library data
 269    structures that require proc server interaction.  This includes
 270    initializing signals; see _hurdsig_init in <hurd/signal.h>.  */
 271
 272 extern void _hurd_proc_init (char **argv,
 273                              const int *intarray, size_t intarraysize);
 274
 275
 276 /* Return the socket server for sockaddr domain DOMAIN.  If DEAD is
 277    nonzero, remove the old cached port and always do a fresh lookup.
 278
 279    It is assumed that a socket server will stay alive during a complex socket
 280    operation involving several RPCs.  But a socket server may die during
 281    long idle periods between socket operations.  Callers should first pass
 282    zero for DEAD; if the first socket RPC tried on the returned port fails
 283    with MACH_SEND_INVALID_DEST or MIG_SERVER_DIED (indicating the server
 284    went away), the caller should call _hurd_socket_server again with DEAD
 285    nonzero and retry the RPC on the new socket server port.  */
 286
 287 extern socket_t _hurd_socket_server (int domain, int dead);
 288
 289 /* Send a `sig_post' RPC to process number PID.  If PID is zero,
 290    send the message to all processes in the current process's process group.
 291    If PID is < -1, send SIG to all processes in process group - PID.
 292    SIG and REFPORT are passed along in the request message.  */
 293
 294 extern error_t _hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 295 extern error_t hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 296
 297 /* Fetch the host privileged port and device master port from the proc
 298    server.  They are fetched only once and then cached in the
 299    variables below.  A special program that gets them from somewhere
 300    other than the proc server (such as a bootstrap filesystem) can set
 301    these variables to install the ports.  */
 302
 303 extern kern_return_t __get_privileged_ports (mach_port_t *host_priv_ptr,
 304                                              device_t *device_master_ptr);
 305 extern kern_return_t get_privileged_ports (mach_port_t *host_priv_ptr,
 306                                            device_t *device_master_ptr);
 307 extern mach_port_t _hurd_host_priv, _hurd_device_master;
 308
 309 /* Return the PID of the task whose control port is TASK.
 310    On error, sets `errno' and returns -1.  */
 311
 312 extern pid_t __task2pid (task_t task), task2pid (task_t task);
 313
 314 /* Return the task control port of process PID.
 315    On error, sets `errno' and returns MACH_PORT_NULL.  */
 316
 317 extern task_t __pid2task (pid_t pid), pid2task (pid_t pid);
 318
 319 /* Return the current thread's thread port.  This is a cheap operation (no
 320    system call), but it relies on Hurd signal state being set up.  */
 321 extern thread_t hurd_thread_self (void);
 322
 323
 324 /* Cancel pending operations on THREAD.  If it is doing an interruptible RPC,
 325    that RPC will now return EINTR; otherwise, the "cancelled" flag will be
 326    set, causing the next `hurd_check_cancel' call to return nonzero or the
 327    next interruptible RPC to return EINTR (whichever is called first).  */
 328 extern error_t hurd_thread_cancel (thread_t thread);
 329
 330 /* Test and clear the calling thread's "cancelled" flag.  */
 331 extern int hurd_check_cancel (void);
 332
 333
 334 /* Return the io server port for file descriptor FD.
 335    This adds a Mach user reference to the returned port.
 336    On error, sets `errno' and returns MACH_PORT_NULL.  */
 337
 338 extern io_t __getdport (int fd), getdport (int fd);
 339
 340
 341 #include <stdarg.h>
 342
 343 /* Write formatted output to PORT, a Mach port supporting the i/o protocol,
 344    according to the format string FORMAT, using the argument list in ARG.  */
 345 int vpprintf (io_t port, const char *format, va_list arg);
 346
 347
 348 #endif  /* hurd.h */