source: rtems/c/src/lib/libc/libio.h @ 32f19fb3

4.104.114.84.95
Last change on this file since 32f19fb3 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

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1/*
2 *  System call and file system interface definition
3 *
4 *  General purpose communication channel for RTEMS to allow UNIX/POSIX
5 *  system call behavior under RTEMS.  Initially this supported only
6 *  IO to devices but has since been enhanced to support networking
7 *  and support for mounted file systems.
8 *
9 *  COPYRIGHT (c) 1989-1999.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.OARcorp.com/rtems/license.html.
15 *
16 *  $Id$
17 */
18
19#ifndef _RTEMS_LIBIO_H
20#define _RTEMS_LIBIO_H
21
22#include <rtems.h>
23#include <sys/types.h>
24#include <sys/stat.h>
25
26/*
27 *  Define data types which must be constructed using forward references.
28 */
29
30typedef struct rtems_libio_tt rtems_libio_t;
31
32struct rtems_filesystem_location_info_tt;
33typedef struct rtems_filesystem_location_info_tt
34    rtems_filesystem_location_info_t;
35
36struct rtems_filesystem_mount_table_entry_tt;
37typedef struct rtems_filesystem_mount_table_entry_tt
38    rtems_filesystem_mount_table_entry_t;
39
40/*
41 * Valid RTEMS file types.
42 */
43typedef enum {
44  RTEMS_FILESYSTEM_DIRECTORY,
45  RTEMS_FILESYSTEM_DEVICE,
46  RTEMS_FILESYSTEM_HARD_LINK,
47  RTEMS_FILESYSTEM_SYM_LINK,
48  RTEMS_FILESYSTEM_MEMORY_FILE
49} rtems_filesystem_node_types_t;
50
51/*
52 *  File Handler Operations Table
53 */
54
55typedef int (*rtems_filesystem_open_t)(
56  rtems_libio_t *iop,
57  const char    *pathname,
58  unsigned32     flag,
59  unsigned32     mode
60);
61
62typedef int (*rtems_filesystem_close_t)(
63  rtems_libio_t *iop
64);
65
66typedef int (*rtems_filesystem_read_t)(
67  rtems_libio_t *iop,
68  void          *buffer,
69  unsigned32     count
70);
71
72typedef int (*rtems_filesystem_write_t)(
73  rtems_libio_t *iop,
74  const void    *buffer,
75  unsigned32    count
76);
77
78typedef int (*rtems_filesystem_ioctl_t)(
79  rtems_libio_t *iop,
80  unsigned32     command,
81  void          *buffer
82);
83
84typedef int (*rtems_filesystem_lseek_t)(
85  rtems_libio_t *iop,
86  off_t          length,
87  int            whence
88);
89
90typedef int (*rtems_filesystem_fstat_t)(
91  rtems_filesystem_location_info_t *loc,
92  struct stat                      *buf
93);
94
95typedef int (*rtems_filesystem_fchmod_t)(
96  rtems_filesystem_location_info_t *loc,
97  mode_t                            mode
98);
99
100typedef int (*rtems_filesystem_ftruncate_t)(
101  rtems_libio_t *iop,
102  off_t          length
103);
104
105typedef int (*rtems_filesystem_fpathconf_t)(
106  rtems_libio_t *iop,
107  int name
108);
109
110typedef int (*rtems_filesystem_fsync_t)(
111  rtems_libio_t *iop
112);
113
114typedef int (*rtems_filesystem_fdatasync_t)(
115  rtems_libio_t *iop
116);
117
118typedef int (*rtems_filesystem_fcntl_t)(
119  int            cmd,
120  rtems_libio_t *iop
121);
122
123typedef int (*rtems_filesystem_rmnod_t)(
124 rtems_filesystem_location_info_t      *pathloc       /* IN */
125);
126
127typedef struct {
128    rtems_filesystem_open_t         open;
129    rtems_filesystem_close_t        close;
130    rtems_filesystem_read_t         read;
131    rtems_filesystem_write_t        write;
132    rtems_filesystem_ioctl_t        ioctl;
133    rtems_filesystem_lseek_t        lseek;
134    rtems_filesystem_fstat_t        fstat;
135    rtems_filesystem_fchmod_t       fchmod;
136    rtems_filesystem_ftruncate_t    ftruncate;
137    rtems_filesystem_fpathconf_t    fpathconf;
138    rtems_filesystem_fsync_t        fsync;
139    rtems_filesystem_fdatasync_t    fdatasync;
140    rtems_filesystem_fcntl_t        fcntl;
141    rtems_filesystem_rmnod_t        rmnod;
142} rtems_filesystem_file_handlers_r;
143
144/*
145 *  File System Operations Table
146 */
147
148/*
149 *  XXX
150 *  This routine does not allocate any space and rtems_filesystem_freenode_t
151 *  is not called by the generic after calling this routine.
152 *  ie. node_access does not have to contain valid data when the
153 *      routine returns.
154 */
155
156typedef int (*rtems_filesystem_mknod_t)(
157   const char                        *path,       /* IN */
158   mode_t                             mode,       /* IN */
159   dev_t                              dev,        /* IN */
160   rtems_filesystem_location_info_t  *pathloc     /* IN/OUT */
161);
162
163/*
164 *  rtems_filesystem_freenode_t must be called by the generic after
165 *  calling this routine
166 */
167
168typedef int (*rtems_filesystem_evalpath_t)(
169  const char                        *pathname,      /* IN     */
170  int                                flags,         /* IN     */
171  rtems_filesystem_location_info_t  *pathloc        /* IN/OUT */
172);
173
174typedef int (*rtems_filesystem_evalmake_t)(
175   const char                       *path,       /* IN */
176   rtems_filesystem_location_info_t *pathloc,    /* IN/OUT */
177   const char                      **name        /* OUT    */
178);
179
180typedef int (*rtems_filesystem_link_t)(
181 rtems_filesystem_location_info_t  *to_loc,      /* IN */
182 rtems_filesystem_location_info_t  *parent_loc,  /* IN */
183 const char                        *name         /* IN */
184);
185
186typedef int (*rtems_filesystem_unlink_t)(
187 rtems_filesystem_location_info_t  *pathloc       /* IN */
188);
189
190typedef int (*rtems_filesystem_chown_t)(
191 rtems_filesystem_location_info_t  *pathloc,       /* IN */
192 uid_t                              owner,         /* IN */
193 gid_t                              group          /* IN */
194);
195
196typedef int (*rtems_filesystem_freenode_t)(
197 rtems_filesystem_location_info_t      *pathloc       /* IN */
198);
199
200typedef int (* rtems_filesystem_mount_t ) (
201   rtems_filesystem_mount_table_entry_t *mt_entry     /* in */
202);
203
204typedef int (* rtems_filesystem_fsmount_me_t )(
205   rtems_filesystem_mount_table_entry_t *mt_entry
206);
207
208typedef int (* rtems_filesystem_unmount_t ) (
209   rtems_filesystem_mount_table_entry_t *mt_entry     /* in */
210);
211
212typedef int (* rtems_filesystem_fsunmount_me_t ) (
213   rtems_filesystem_mount_table_entry_t *mt_entry    /* in */
214);
215
216typedef rtems_filesystem_node_types_t (* rtems_filesystem_node_type_t) (
217  rtems_filesystem_location_info_t    *pathloc      /* in */
218);
219
220typedef int (* rtems_filesystem_utime_t)(
221  rtems_filesystem_location_info_t  *pathloc,       /* IN */
222  time_t                             actime,        /* IN */
223  time_t                             modtime        /* IN */
224);
225
226typedef int (*rtems_filesystem_evaluate_link_t)(
227  rtems_filesystem_location_info_t *pathloc,     /* IN/OUT */
228  int                               flags        /* IN     */
229);
230
231typedef int (*rtems_filesystem_symlink_t)(
232 rtems_filesystem_location_info_t  *loc,         /* IN */
233 const char                        *link_name,   /* IN */
234 const char                        *node_name
235);
236
237typedef int (*rtems_filesystem_readlink_t)(
238 rtems_filesystem_location_info_t  *loc,     /* IN  */       
239 char                              *buf,     /* OUT */       
240 size_t                            bufsize   
241);
242
243/*
244 * operations table that must be defined for every file system.
245 */
246
247/*
248 * File system types
249 */
250typedef struct {
251    rtems_filesystem_evalpath_t      evalpath;
252    rtems_filesystem_evalmake_t      evalformake;
253    rtems_filesystem_link_t          link;
254    rtems_filesystem_unlink_t        unlink;
255    rtems_filesystem_node_type_t     node_type;
256    rtems_filesystem_mknod_t         mknod;
257    rtems_filesystem_chown_t         chown;
258    rtems_filesystem_freenode_t      freenod;
259    rtems_filesystem_mount_t         mount;
260    rtems_filesystem_fsmount_me_t    fsmount_me;
261    rtems_filesystem_unmount_t       unmount;
262    rtems_filesystem_fsunmount_me_t  fsunmount_me;
263    rtems_filesystem_utime_t         utime;
264    rtems_filesystem_evaluate_link_t eval_link;
265    rtems_filesystem_symlink_t       symlink;
266    rtems_filesystem_readlink_t      readlink;
267} rtems_filesystem_operations_table;
268
269#define IMFS_FILE_SYSTEM IMFS_ops
270extern rtems_filesystem_operations_table  IMFS_ops;
271
272
273/*
274 * Structure used to determine a location/filesystem in the tree.
275 */
276
277struct rtems_filesystem_location_info_tt
278{
279  void                                   *node_access;
280  rtems_filesystem_file_handlers_r       *handlers;
281  rtems_filesystem_operations_table      *ops;
282  rtems_filesystem_mount_table_entry_t   *mt_entry;
283};
284
285/*
286 *  Structure used to contain file system specific information which
287 *  is required to support fpathconf().
288 */
289
290typedef struct {
291  int    link_max;
292  int    max_canon;
293  int    max_input;
294  int    name_max;
295  int    path_max;
296  int    pipe_buf;
297  int    posix_async_io;
298  int    posix_chown_restrictions;
299  int    posix_no_trunc;
300  int    posix_prio_io;
301  int    posix_sync_io;
302  int    posix_vdisable;
303} rtems_filesystem_limits_and_options_t;
304
305/*
306 * Structure for a mount table entry.
307 */
308
309struct rtems_filesystem_mount_table_entry_tt {
310  Chain_Node                             Node;
311  rtems_filesystem_location_info_t       mt_point_node;
312  rtems_filesystem_location_info_t       mt_fs_root;
313  int                                    options;
314  void                                  *fs_info;
315
316  rtems_filesystem_limits_and_options_t  pathconf_limits_and_options;
317
318  /*
319   *  When someone adds a mounted filesystem on a real device,
320   *  this will need to be used.
321   *
322   *  The best option long term for this is probably an open file descriptor.
323   */
324  char                                  *dev;
325};
326
327/*
328 *  Valid RTEMS file systems options
329 */
330
331typedef enum
332{
333  RTEMS_FILESYSTEM_READ_ONLY,
334  RTEMS_FILESYSTEM_READ_WRITE,
335  RTEMS_FILESYSTEM_BAD_OPTIONS
336} rtems_filesystem_options_t;
337
338
339/*
340 *  An open file data structure, indexed by 'fd'
341 *  TODO:
342 *     should really have a separate per/file data structure that this
343 *     points to (eg: size, offset, driver, pathname should be in that)
344 */
345
346struct rtems_libio_tt {
347    rtems_driver_name_t              *driver;
348    off_t                             size;      /* size of file */
349    off_t                             offset;    /* current offset into file */
350    unsigned32                        flags;
351    rtems_filesystem_location_info_t  pathinfo;
352    Objects_Id                        sem;     
353    unsigned32                        data0;     /* private to "driver" */
354    void                             *data1;     /* ... */
355    void                             *file_info; /* used by file handlers */
356    rtems_filesystem_file_handlers_r *handlers;  /* type specific handlers */
357};
358
359/*
360 *  param block for read/write
361 *  Note: it must include 'offset' instead of using iop's offset since
362 *        we can have multiple outstanding i/o's on a device.
363 */
364
365typedef struct {
366    rtems_libio_t          *iop;
367    off_t                   offset;
368    unsigned8              *buffer;
369    unsigned32              count;
370    unsigned32              flags;
371    unsigned32              bytes_moved;
372} rtems_libio_rw_args_t;
373
374/*
375 *  param block for open/close
376 */
377
378typedef struct {
379    rtems_libio_t          *iop;
380    unsigned32              flags;
381    unsigned32              mode;
382} rtems_libio_open_close_args_t;
383
384/*
385 *  param block for ioctl
386 */
387
388typedef struct {
389    rtems_libio_t          *iop;
390    unsigned32              command;
391    void                   *buffer;
392    unsigned32              ioctl_return;
393} rtems_libio_ioctl_args_t;
394
395/*
396 *  Values for 'flag'
397 */
398
399#define LIBIO_FLAGS_NO_DELAY      0x0001  /* return immediately if no data */
400#define LIBIO_FLAGS_READ          0x0002  /* reading */
401#define LIBIO_FLAGS_WRITE         0x0004  /* writing */
402#define LIBIO_FLAGS_OPEN          0x0100  /* device is open */
403#define LIBIO_FLAGS_APPEND        0x0200  /* all writes append */
404#define LIBIO_FLAGS_CREATE        0x0400  /* create file */
405#define LIBIO_FLAGS_CLOSE_ON_EXEC 0x0800  /* close on process exec() */
406#define LIBIO_FLAGS_READ_WRITE    (LIBIO_FLAGS_READ | LIBIO_FLAGS_WRITE)
407
408void rtems_libio_init(void);
409
410/*
411 *  External I/O handlers
412 */
413
414typedef int (*rtems_libio_open_t)(
415  const char  *pathname,
416  unsigned32  flag,
417  unsigned32  mode
418);
419
420typedef int (*rtems_libio_close_t)(
421  int  fd
422);
423
424typedef int (*rtems_libio_read_t)(
425  int         fd,
426  void       *buffer,
427  unsigned32  count
428);
429
430typedef int (*rtems_libio_write_t)(
431  int         fd,
432  const void *buffer,
433  unsigned32  count
434);
435
436typedef int (*rtems_libio_ioctl_t)(
437  int         fd,
438  unsigned32  command,
439  void       *buffer
440);
441
442typedef int (*rtems_libio_lseek_t)(
443  int    fd,
444  off_t  offset,
445  int    whence
446);
447
448/*
449 *  IOCTL values
450 */
451
452#define       RTEMS_IO_GET_ATTRIBUTES 1
453#define       RTEMS_IO_SET_ATTRIBUTES 2
454#define       RTEMS_IO_TCDRAIN        3
455
456/*
457 *  The following macros are used to build up the permissions sets
458 *  used to check permissions.  These are similar in style to the
459 *  mode_t bits and should stay compatible with them.
460 */
461
462#define RTEMS_LIBIO_PERMS_READ   S_IROTH
463#define RTEMS_LIBIO_PERMS_WRITE  S_IWOTH
464#define RTEMS_LIBIO_PERMS_RDWR   (S_IROTH|S_IWOTH)
465#define RTEMS_LIBIO_PERMS_EXEC   S_IXOTH
466#define RTEMS_LIBIO_PERMS_SEARCH RTEMS_LIBIO_PERMS_EXEC
467#define RTEMS_LIBIO_PERMS_RWX    S_IRWXO
468
469/*
470 *  Macros
471 */
472
473#define rtems_filesystem_make_dev_t( _major, _minor ) \
474  ((((dev_t)(_major)) << 32) | (dev_t)(_minor))
475
476#define rtems_filesystem_split_dev_t( _dev, _major, _minor ) \
477  do { \
478    (_major) = (rtems_device_major_number) ((_dev) >> 32); \
479    (_minor) = (rtems_device_minor_number) ((_dev) & 0xFFFFFFFF); \
480  } while(0)
481
482/*
483 * Verifies that the permission flag is valid.
484 */
485#define rtems_libio_is_valid_perms( _perm )     \
486 (~ ((~RTEMS_LIBIO_PERMS_RWX) & _perm ))
487
488
489/*
490 *  Prototypes for filesystem
491 */
492
493void rtems_filesystem_initialize( void );
494
495
496/*
497 * Callbacks from TERMIOS routines to device-dependent code
498 */
499
500#include <termios.h>
501
502typedef struct rtems_termios_callbacks {
503  int    (*firstOpen)(int major, int minor, void *arg);
504  int    (*lastClose)(int major, int minor, void *arg);
505  int    (*pollRead)(int minor);
506  int    (*write)(int minor, const char *buf, int len);
507  int    (*setAttributes)(int minor, const struct termios *t);
508  int    (*stopRemoteTx)(int minor);
509  int    (*startRemoteTx)(int minor);
510  int    outputUsesInterrupts;
511} rtems_termios_callbacks;
512
513/*
514 *  Device-independent TERMIOS routines
515 */
516
517void rtems_termios_initialize (void);
518
519rtems_status_code rtems_termios_open (
520  rtems_device_major_number      major,
521  rtems_device_minor_number      minor,
522  void                          *arg,
523  const rtems_termios_callbacks *callbacks
524);
525
526rtems_status_code rtems_termios_close(
527  void *arg
528);
529
530rtems_status_code rtems_termios_read(
531  void *arg
532);
533
534rtems_status_code rtems_termios_write(
535  void *arg
536);
537
538rtems_status_code rtems_termios_ioctl(
539  void *arg
540);
541
542int rtems_termios_enqueue_raw_characters(
543  void *ttyp,
544  char *buf,
545  int   len
546);
547
548int rtems_termios_dequeue_characters(
549  void *ttyp,
550  int   len
551);
552
553void rtems_termios_reserve_resources(
554  rtems_configuration_table *configuration,
555  rtems_unsigned32           number_of_devices
556);
557
558int unmount(
559  const char *mount_path
560);
561
562int mount(
563  rtems_filesystem_mount_table_entry_t **mt_entry,
564  rtems_filesystem_operations_table    *fs_ops,
565  rtems_filesystem_options_t            fsoptions,
566  char                                 *device,
567  char                                 *mount_point
568);
569
570/*
571 *  Boot Time Mount Table Structure
572 */
573
574typedef struct {
575  rtems_filesystem_operations_table     *fs_ops;
576  rtems_filesystem_options_t             fsoptions;
577  char                                  *device;
578  char                                  *mount_point;
579} rtems_filesystem_mount_table_t;
580
581extern rtems_filesystem_mount_table_t *rtems_filesystem_mount_table;
582extern int                             rtems_filesystem_mount_table_size;
583
584#endif /* _RTEMS_LIBIO_H */
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