hurd/hurd.h

   1 /* Copyright (C) 1993-2023 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _HURD_H
  19
  20 #define _HURD_H 1
  21 #include <features.h>
  22
  23
  24 /* Get types, macros, constants and function declarations
  25    for all Mach microkernel interaction.  */
  26 #include <mach.h>
  27 #include <mach/mig_errors.h>
  28
  29 /* Get types and constants necessary for Hurd interfaces.  */
  30 #include <hurd/hurd_types.h>
  31
  32 /* Get MiG stub declarations for commonly used Hurd interfaces.  */
  33 #include <hurd/auth.h>
  34 #include <hurd/process.h>
  35 #include <hurd/fs.h>
  36 #include <hurd/io.h>
  37
  38 /* Get `struct hurd_port' and related definitions implementing lightweight
  39    user references for ports.  These are used pervasively throughout the C
  40    library; this is here to avoid putting it in nearly every source file.  */
  41 #include <hurd/port.h>
  42
  43 #include <errno.h>
  44 #include <bits/types/error_t.h>
  45 #include <bits/types/sigset_t.h>
  46
  47 #ifndef _HURD_H_EXTERN_INLINE
  48 #define _HURD_H_EXTERN_INLINE __extern_inline
  49 #endif
  50
  51 extern int __hurd_fail (error_t err) __COLD;
  52
  53 #ifdef __USE_EXTERN_INLINES
  54 _HURD_H_EXTERN_INLINE int
  55 __hurd_fail (error_t err)
  56 {
  57   switch (err)
  58     {
  59     case EMACH_SEND_INVALID_DEST:
  60     case EMIG_SERVER_DIED:
  61       /* The server has disappeared!  */
  62       err = (error_t) EIEIO;
  63       break;
  64
  65     case KERN_NO_SPACE:
  66       err = (error_t) ENOMEM;
  67       break;
  68
  69     case KERN_INVALID_ADDRESS:
  70     case KERN_INVALID_ARGUMENT:
  71       err = (error_t) EINVAL;
  72       break;
  73
  74     case 0:
  75       return 0;
  76
  77     default:
  78       break;
  79     }
  80
  81   errno = err;
  82   return -1;
  83 }
  84 #endif
  85 \f
  86 /* Basic ports and info, initialized by startup.  */
  87
  88 extern int _hurd_exec_flags;    /* Flags word passed in exec_startup.  */
  89 extern struct hurd_port *_hurd_ports;
  90 extern unsigned int _hurd_nports;
  91 extern mode_t _hurd_umask;
  92 extern sigset_t _hurdsig_traced;
  93
  94 /* Shorthand macro for internal library code referencing _hurd_ports (see
  95    <hurd/port.h>).  */
  96 /* Also see __USEPORT_CANCEL.  */
  97
  98 #define __USEPORT(which, expr) \
  99   HURD_PORT_USE (&_hurd_ports[INIT_PORT_##which], (expr))
 100
 101 /* Function version of __USEPORT: calls OPERATE with a send right.  */
 102
 103 extern error_t _hurd_ports_use (int which, error_t (*operate) (mach_port_t));
 104
 105
 106 /* Base address and size of the initial stack set up by the exec server.
 107    Not locked.  */
 108
 109 extern vm_address_t _hurd_stack_base;
 110 extern vm_size_t _hurd_stack_size;
 111
 112 /* Initial file descriptor table we were passed at startup.  If we are
 113    using a real dtable, these are turned into that and then cleared at
 114    startup.  If not, these are never changed after startup.  Not locked.  */
 115
 116 extern mach_port_t *_hurd_init_dtable;
 117 extern mach_msg_type_number_t _hurd_init_dtablesize;
 118 \f
 119 /* Current process IDs.  */
 120
 121 extern pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
 122 extern int _hurd_orphaned;
 123
 124 /* This variable is incremented every time the process IDs change.  */
 125 extern unsigned int _hurd_pids_changed_stamp;
 126 \f
 127 /* Unix `data break', for brk and sbrk.
 128    If brk and sbrk are not used, this info will not be initialized or used.  */
 129
 130
 131 /* Data break.  This is what `sbrk (0)' returns.  */
 132
 133 extern vm_address_t _hurd_brk;
 134
 135 /* End of allocated space.  This is generally `round_page (_hurd_brk)'.  */
 136
 137 extern vm_address_t _hurd_data_end;
 138
 139 /* This mutex locks _hurd_brk and _hurd_data_end.  */
 140
 141 extern struct mutex _hurd_brk_lock;
 142
 143 /* Set the data break to NEWBRK; _hurd_brk_lock must
 144    be held, and is released on return.  */
 145
 146 extern int _hurd_set_brk (vm_address_t newbrk);
 147 \f
 148 #include <bits/types/FILE.h>
 149
 150 /* Calls to get and set basic ports.  */
 151
 152 extern error_t _hurd_ports_get (unsigned int which, mach_port_t *result);
 153 extern error_t _hurd_ports_set (unsigned int which, mach_port_t newport);
 154
 155 extern process_t getproc (void);
 156 extern file_t getcwdir (void), getcrdir (void);
 157 extern auth_t getauth (void);
 158 extern mach_port_t getcttyid (void);
 159 extern int setproc (process_t);
 160 extern int setcwdir (file_t), setcrdir (file_t);
 161 extern int setcttyid (mach_port_t);
 162
 163 /* Does reauth with the proc server and fd io servers.  */
 164 extern int __setauth (auth_t), setauth (auth_t);
 165
 166
 167 /* Modify a port cell by looking up a directory name.
 168    This verifies that it is a directory and that we have search permission.  */
 169 extern int _hurd_change_directory_port_from_name (struct hurd_port *portcell,
 170                                                   const char *name);
 171 /* Same thing, but using an open file descriptor.
 172    Also verifies that it is a directory and that we have search permission.  */
 173 extern int _hurd_change_directory_port_from_fd (struct hurd_port *portcell,
 174                                                 int fd);
 175
 176
 177
 178 /* Get and set the effective UID set.  */
 179 extern int geteuids (int __n, uid_t *__uidset);
 180 extern int seteuids (int __n, const uid_t *__uidset);
 181
 182
 183 /* Split FILE into a directory and a name within the directory.  The
 184    directory lookup uses the current root and working directory.  If
 185    successful, stores in *NAME a pointer into FILE where the name
 186    within directory begins and returns a port to the directory;
 187    otherwise sets `errno' and returns MACH_PORT_NULL.  */
 188
 189 extern file_t __file_name_split (const char *file, char **name);
 190 extern file_t file_name_split (const char *file, char **name);
 191
 192 /* Split DIRECTORY into a parent directory and a name within the directory.
 193    This is the same as file_name_split, but ignores trailing slashes.  */
 194
 195 extern file_t __directory_name_split (const char *file, char **name);
 196 extern file_t directory_name_split (const char *file, char **name);
 197
 198 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
 199    The file lookup uses the current root and working directory.
 200    Returns a port to the file if successful; otherwise sets `errno'
 201    and returns MACH_PORT_NULL.  */
 202
 203 extern file_t __file_name_lookup (const char *file, int flags, mode_t mode);
 204 extern file_t file_name_lookup (const char *file, int flags, mode_t mode);
 205
 206 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).  The
 207    file lookup uses the current root directory, but uses STARTDIR as the
 208    "working directory" for file relative names.  Returns a port to the file
 209    if successful; otherwise sets `errno' and returns MACH_PORT_NULL.  */
 210
 211 extern file_t __file_name_lookup_under (file_t startdir, const char *file,
 212                                         int flags, mode_t mode);
 213 extern file_t file_name_lookup_under (file_t startdir, const char *file,
 214                                       int flags, mode_t mode);
 215
 216
 217 /* Lookup FILE_NAME and return the node opened with FLAGS & MODE
 218    (see hurd_file_name_lookup for details), but a simple file name (without
 219    any directory prefixes) will be consecutively prefixed with the pathnames
 220    in the `:' separated list PATH until one succeeds in a successful lookup.
 221    If none succeed, then the first error that wasn't ENOENT is returned, or
 222    ENOENT if no other errors were returned.  If PREFIXED_NAME is non-NULL,
 223    then if the result is looked up directly, *PREFIXED_NAME is set to NULL, and
 224    if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to
 225    malloc'd storage containing the prefixed name.  */
 226 extern file_t file_name_path_lookup (const char *file_name, const char *path,
 227                                      int flags, mode_t mode,
 228                                      char **prefixed_name);
 229
 230
 231
 232 /* Open a file descriptor on a port.  FLAGS are as for `open'; flags
 233    affected by io_set_openmodes are not changed by this.  If successful,
 234    this consumes a user reference for PORT (which will be deallocated on
 235    close).  */
 236
 237 extern int openport (io_t port, int flags);
 238
 239 /* Open a stream on a port.  MODE is as for `fopen'.
 240    If successful, this consumes a user reference for PORT
 241    (which will be deallocated on fclose).  */
 242
 243 extern FILE *fopenport (io_t port, const char *mode);
 244 extern FILE *__fopenport (io_t port, const char *mode);
 245
 246
 247 /* Deprecated: use _hurd_exec_paths instead.  */
 248
 249 extern error_t _hurd_exec (task_t task,
 250                            file_t file,
 251                            char *const argv[],
 252                            char *const envp[]) __attribute_deprecated__;
 253
 254 /* Execute a file, replacing TASK's current program image.  */
 255
 256 extern error_t _hurd_exec_paths (task_t task,
 257                                  file_t file,
 258                                  const char *path,
 259                                  const char *abspath,
 260                                  char *const argv[],
 261                                  char *const envp[]);
 262
 263
 264 /* Inform the proc server we have exited with STATUS, and kill the
 265    task thoroughly.  This function never returns, no matter what.  */
 266
 267 extern void _hurd_exit (int status) __attribute__ ((noreturn));
 268
 269
 270 /* Initialize the library data structures from the
 271    ints and ports passed to us by the exec server.
 272    Then vm_deallocate PORTARRAY and INTARRAY.  */
 273
 274 extern void _hurd_init (int flags, char **argv,
 275                         mach_port_t *portarray, size_t portarraysize,
 276                         int *intarray, size_t intarraysize);
 277
 278 /* Register the process to the proc server.  */
 279 extern void _hurd_libc_proc_init (char **argv);
 280
 281 /* Do startup handshaking with the proc server, and initialize library data
 282    structures that require proc server interaction.  This includes
 283    initializing signals; see _hurdsig_init in <hurd/signal.h>.  */
 284
 285 extern void _hurd_proc_init (char **argv,
 286                              const int *intarray, size_t intarraysize);
 287
 288
 289 /* Return the socket server for sockaddr domain DOMAIN.  If DEAD is
 290    nonzero, remove the old cached port and always do a fresh lookup.
 291
 292    It is assumed that a socket server will stay alive during a complex socket
 293    operation involving several RPCs.  But a socket server may die during
 294    long idle periods between socket operations.  Callers should first pass
 295    zero for DEAD; if the first socket RPC tried on the returned port fails
 296    with MACH_SEND_INVALID_DEST or MIG_SERVER_DIED (indicating the server
 297    went away), the caller should call _hurd_socket_server again with DEAD
 298    nonzero and retry the RPC on the new socket server port.  */
 299
 300 extern socket_t _hurd_socket_server (int domain, int dead);
 301
 302 /* Send a `sig_post' RPC to process number PID.  If PID is zero,
 303    send the message to all processes in the current process's process group.
 304    If PID is < -1, send SIG to all processes in process group - PID.
 305    SIG and REFPORT are passed along in the request message.  */
 306
 307 extern error_t _hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 308 extern error_t hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 309
 310 /* Fetch the host privileged port and device master port from the proc
 311    server.  They are fetched only once and then cached in the
 312    variables below.  A special program that gets them from somewhere
 313    other than the proc server (such as a bootstrap filesystem) can set
 314    these variables to install the ports.  */
 315
 316 extern kern_return_t __get_privileged_ports (mach_port_t *host_priv_ptr,
 317                                              device_t *device_master_ptr);
 318 extern kern_return_t get_privileged_ports (mach_port_t *host_priv_ptr,
 319                                            device_t *device_master_ptr);
 320 extern mach_port_t _hurd_host_priv, _hurd_device_master;
 321
 322 /* Return the PID of the task whose control port is TASK.
 323    On error, sets `errno' and returns -1.  */
 324
 325 extern pid_t __task2pid (task_t task), task2pid (task_t task);
 326
 327 /* Return the task control port of process PID.
 328    On error, sets `errno' and returns MACH_PORT_NULL.  */
 329
 330 extern task_t __pid2task (pid_t pid), pid2task (pid_t pid);
 331
 332 /* Return the current thread's thread port.  This is a cheap operation (no
 333    system call), but it relies on Hurd signal state being set up.  */
 334 extern thread_t hurd_thread_self (void);
 335
 336
 337 /* Cancel pending operations on THREAD.  If it is doing an interruptible RPC,
 338    that RPC will now return EINTR; otherwise, the "cancelled" flag will be
 339    set, causing the next `hurd_check_cancel' call to return nonzero or the
 340    next interruptible RPC to return EINTR (whichever is called first).  */
 341 extern error_t hurd_thread_cancel (thread_t thread);
 342
 343 /* Test and clear the calling thread's "cancelled" flag.  */
 344 extern int hurd_check_cancel (void);
 345
 346
 347 /* Return the io server port for file descriptor FD.
 348    This adds a Mach user reference to the returned port.
 349    On error, sets `errno' and returns MACH_PORT_NULL.  */
 350
 351 extern io_t __getdport (int fd), getdport (int fd);
 352
 353
 354 #include <stdarg.h>
 355
 356 /* Write formatted output to PORT, a Mach port supporting the i/o protocol,
 357    according to the format string FORMAT, using the argument list in ARG.  */
 358 int vpprintf (io_t port, const char *format, va_list arg);
 359
 360
 361 #endif  /* hurd.h */