hurd/hurd.h

   1 /* Copyright (C) 1993-2020 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);
  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_ARGUMENT:
  70       err = (error_t) EINVAL;
  71       break;
  72
  73     case 0:
  74       return 0;
  75
  76     default:
  77       break;
  78     }
  79
  80   errno = err;
  81   return -1;
  82 }
  83 #endif
  84 \f
  85 /* Basic ports and info, initialized by startup.  */
  86
  87 extern int _hurd_exec_flags;    /* Flags word passed in exec_startup.  */
  88 extern struct hurd_port *_hurd_ports;
  89 extern unsigned int _hurd_nports;
  90 extern mode_t _hurd_umask;
  91 extern sigset_t _hurdsig_traced;
  92
  93 /* Shorthand macro for internal library code referencing _hurd_ports (see
  94    <hurd/port.h>).  */
  95
  96 #define __USEPORT(which, expr) \
  97   HURD_PORT_USE (&_hurd_ports[INIT_PORT_##which], (expr))
  98
  99 /* Function version of __USEPORT: calls OPERATE with a send right.  */
 100
 101 extern error_t _hurd_ports_use (int which, error_t (*operate) (mach_port_t));
 102
 103
 104 /* Base address and size of the initial stack set up by the exec server.
 105    If using cthreads, this stack is deallocated in startup.
 106    Not locked.  */
 107
 108 extern vm_address_t _hurd_stack_base;
 109 extern vm_size_t _hurd_stack_size;
 110
 111 /* Initial file descriptor table we were passed at startup.  If we are
 112    using a real dtable, these are turned into that and then cleared at
 113    startup.  If not, these are never changed after startup.  Not locked.  */
 114
 115 extern mach_port_t *_hurd_init_dtable;
 116 extern mach_msg_type_number_t _hurd_init_dtablesize;
 117 \f
 118 /* Current process IDs.  */
 119
 120 extern pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
 121 extern int _hurd_orphaned;
 122
 123 /* This variable is incremented every time the process IDs change.  */
 124 extern unsigned int _hurd_pids_changed_stamp;
 125
 126 /* This condition is broadcast every time the process IDs change.  */
 127 extern struct condition _hurd_pids_changed_sync;
 128 \f
 129 /* Unix `data break', for brk and sbrk.
 130    If brk and sbrk are not used, this info will not be initialized or used.  */
 131
 132
 133 /* Data break.  This is what `sbrk (0)' returns.  */
 134
 135 extern vm_address_t _hurd_brk;
 136
 137 /* End of allocated space.  This is generally `round_page (_hurd_brk)'.  */
 138
 139 extern vm_address_t _hurd_data_end;
 140
 141 /* This mutex locks _hurd_brk and _hurd_data_end.  */
 142
 143 extern struct mutex _hurd_brk_lock;
 144
 145 /* Set the data break to NEWBRK; _hurd_brk_lock must
 146    be held, and is released on return.  */
 147
 148 extern int _hurd_set_brk (vm_address_t newbrk);
 149 \f
 150 #include <bits/types/FILE.h>
 151
 152 /* Calls to get and set basic ports.  */
 153
 154 extern error_t _hurd_ports_get (unsigned int which, mach_port_t *result);
 155 extern error_t _hurd_ports_set (unsigned int which, mach_port_t newport);
 156
 157 extern process_t getproc (void);
 158 extern file_t getcwdir (void), getcrdir (void);
 159 extern auth_t getauth (void);
 160 extern mach_port_t getcttyid (void);
 161 extern int setproc (process_t);
 162 extern int setcwdir (file_t), setcrdir (file_t);
 163 extern int setcttyid (mach_port_t);
 164
 165 /* Does reauth with the proc server and fd io servers.  */
 166 extern int __setauth (auth_t), setauth (auth_t);
 167
 168
 169 /* Modify a port cell by looking up a directory name.
 170    This verifies that it is a directory and that we have search permission.  */
 171 extern int _hurd_change_directory_port_from_name (struct hurd_port *portcell,
 172                                                   const char *name);
 173 /* Same thing, but using an open file descriptor.
 174    Also verifies that it is a directory and that we have search permission.  */
 175 extern int _hurd_change_directory_port_from_fd (struct hurd_port *portcell,
 176                                                 int fd);
 177
 178
 179
 180 /* Get and set the effective UID set.  */
 181 extern int geteuids (int __n, uid_t *__uidset);
 182 extern int seteuids (int __n, const uid_t *__uidset);
 183
 184
 185 /* Split FILE into a directory and a name within the directory.  The
 186    directory lookup uses the current root and working directory.  If
 187    successful, stores in *NAME a pointer into FILE where the name
 188    within directory begins and returns a port to the directory;
 189    otherwise sets `errno' and returns MACH_PORT_NULL.  */
 190
 191 extern file_t __file_name_split (const char *file, char **name);
 192 extern file_t file_name_split (const char *file, char **name);
 193
 194 /* Split DIRECTORY into a parent directory and a name within the directory.
 195    This is the same as file_name_split, but ignores trailing slashes.  */
 196
 197 extern file_t __directory_name_split (const char *file, char **name);
 198 extern file_t directory_name_split (const char *file, char **name);
 199
 200 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
 201    The file lookup uses the current root and working directory.
 202    Returns a port to the file if successful; otherwise sets `errno'
 203    and returns MACH_PORT_NULL.  */
 204
 205 extern file_t __file_name_lookup (const char *file, int flags, mode_t mode);
 206 extern file_t file_name_lookup (const char *file, int flags, mode_t mode);
 207
 208 /* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).  The
 209    file lookup uses the current root directory, but uses STARTDIR as the
 210    "working directory" for file relative names.  Returns a port to the file
 211    if successful; otherwise sets `errno' and returns MACH_PORT_NULL.  */
 212
 213 extern file_t __file_name_lookup_under (file_t startdir, const char *file,
 214                                         int flags, mode_t mode);
 215 extern file_t file_name_lookup_under (file_t startdir, const char *file,
 216                                       int flags, mode_t mode);
 217
 218
 219 /* Lookup FILE_NAME and return the node opened with FLAGS & MODE
 220    (see hurd_file_name_lookup for details), but a simple file name (without
 221    any directory prefixes) will be consecutively prefixed with the pathnames
 222    in the `:' separated list PATH until one succeeds in a successful lookup.
 223    If none succeed, then the first error that wasn't ENOENT is returned, or
 224    ENOENT if no other errors were returned.  If PREFIXED_NAME is non-NULL,
 225    then if the result is looked up directly, *PREFIXED_NAME is set to NULL, and
 226    if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to
 227    malloc'd storage containing the prefixed name.  */
 228 extern file_t file_name_path_lookup (const char *file_name, const char *path,
 229                                      int flags, mode_t mode,
 230                                      char **prefixed_name);
 231
 232
 233
 234 /* Open a file descriptor on a port.  FLAGS are as for `open'; flags
 235    affected by io_set_openmodes are not changed by this.  If successful,
 236    this consumes a user reference for PORT (which will be deallocated on
 237    close).  */
 238
 239 extern int openport (io_t port, int flags);
 240
 241 /* Open a stream on a port.  MODE is as for `fopen'.
 242    If successful, this consumes a user reference for PORT
 243    (which will be deallocated on fclose).  */
 244
 245 extern FILE *fopenport (io_t port, const char *mode);
 246 extern FILE *__fopenport (io_t port, const char *mode);
 247
 248
 249 /* Deprecated: use _hurd_exec_paths instead.  */
 250
 251 extern error_t _hurd_exec (task_t task,
 252                            file_t file,
 253                            char *const argv[],
 254                            char *const envp[]) __attribute_deprecated__;
 255
 256 /* Execute a file, replacing TASK's current program image.  */
 257
 258 extern error_t _hurd_exec_paths (task_t task,
 259                                  file_t file,
 260                                  const char *path,
 261                                  const char *abspath,
 262                                  char *const argv[],
 263                                  char *const envp[]);
 264
 265
 266 /* Inform the proc server we have exited with STATUS, and kill the
 267    task thoroughly.  This function never returns, no matter what.  */
 268
 269 extern void _hurd_exit (int status) __attribute__ ((noreturn));
 270
 271
 272 /* Initialize the library data structures from the
 273    ints and ports passed to us by the exec server.
 274    Then vm_deallocate PORTARRAY and INTARRAY.  */
 275
 276 extern void _hurd_init (int flags, char **argv,
 277                         mach_port_t *portarray, size_t portarraysize,
 278                         int *intarray, size_t intarraysize);
 279
 280 /* Do startup handshaking with the proc server, and initialize library data
 281    structures that require proc server interaction.  This includes
 282    initializing signals; see _hurdsig_init in <hurd/signal.h>.  */
 283
 284 extern void _hurd_proc_init (char **argv,
 285                              const int *intarray, size_t intarraysize);
 286
 287
 288 /* Return the socket server for sockaddr domain DOMAIN.  If DEAD is
 289    nonzero, remove the old cached port and always do a fresh lookup.
 290
 291    It is assumed that a socket server will stay alive during a complex socket
 292    operation involving several RPCs.  But a socket server may die during
 293    long idle periods between socket operations.  Callers should first pass
 294    zero for DEAD; if the first socket RPC tried on the returned port fails
 295    with MACH_SEND_INVALID_DEST or MIG_SERVER_DIED (indicating the server
 296    went away), the caller should call _hurd_socket_server again with DEAD
 297    nonzero and retry the RPC on the new socket server port.  */
 298
 299 extern socket_t _hurd_socket_server (int domain, int dead);
 300
 301 /* Send a `sig_post' RPC to process number PID.  If PID is zero,
 302    send the message to all processes in the current process's process group.
 303    If PID is < -1, send SIG to all processes in process group - PID.
 304    SIG and REFPORT are passed along in the request message.  */
 305
 306 extern error_t _hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 307 extern error_t hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
 308
 309 /* Fetch the host privileged port and device master port from the proc
 310    server.  They are fetched only once and then cached in the
 311    variables below.  A special program that gets them from somewhere
 312    other than the proc server (such as a bootstrap filesystem) can set
 313    these variables to install the ports.  */
 314
 315 extern kern_return_t __get_privileged_ports (mach_port_t *host_priv_ptr,
 316                                              device_t *device_master_ptr);
 317 extern kern_return_t get_privileged_ports (mach_port_t *host_priv_ptr,
 318                                            device_t *device_master_ptr);
 319 extern mach_port_t _hurd_host_priv, _hurd_device_master;
 320
 321 /* Return the PID of the task whose control port is TASK.
 322    On error, sets `errno' and returns -1.  */
 323
 324 extern pid_t __task2pid (task_t task), task2pid (task_t task);
 325
 326 /* Return the task control port of process PID.
 327    On error, sets `errno' and returns MACH_PORT_NULL.  */
 328
 329 extern task_t __pid2task (pid_t pid), pid2task (pid_t pid);
 330
 331 /* Return the current thread's thread port.  This is a cheap operation (no
 332    system call), but it relies on Hurd signal state being set up.  */
 333 extern thread_t hurd_thread_self (void);
 334
 335
 336 /* Cancel pending operations on THREAD.  If it is doing an interruptible RPC,
 337    that RPC will now return EINTR; otherwise, the "cancelled" flag will be
 338    set, causing the next `hurd_check_cancel' call to return nonzero or the
 339    next interruptible RPC to return EINTR (whichever is called first).  */
 340 extern error_t hurd_thread_cancel (thread_t thread);
 341
 342 /* Test and clear the calling thread's "cancelled" flag.  */
 343 extern int hurd_check_cancel (void);
 344
 345
 346 /* Return the io server port for file descriptor FD.
 347    This adds a Mach user reference to the returned port.
 348    On error, sets `errno' and returns MACH_PORT_NULL.  */
 349
 350 extern io_t __getdport (int fd), getdport (int fd);
 351
 352
 353 #include <stdarg.h>
 354
 355 /* Write formatted output to PORT, a Mach port supporting the i/o protocol,
 356    according to the format string FORMAT, using the argument list in ARG.  */
 357 int vpprintf (io_t port, const char *format, va_list arg);
 358
 359
 360 #endif  /* hurd.h */