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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [include/] [rtems/] [libio_.h] - Blame information for rev 1026

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1 1026 ivang 
/*
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 *  Libio Internal Information
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  libio_.h,v 1.18 2002/01/04 17:57:27 joel Exp
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 */
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#ifndef __RTEMS_LIBIO_INTERNAL__h
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#define __RTEMS_LIBIO_INTERNAL__h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <rtems.h>
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#include <rtems/libio.h>                /* include before standard IO */
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#include <rtems/assoc.h>                /* assoc.h not included by rtems.h */
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#include <sys/types.h>
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#include <stdio.h>                      /* O_RDONLY, et.al. */
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#include <fcntl.h>                      /* O_RDONLY, et.al. */
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#include <assert.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <errno.h>
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#if ! defined(O_NDELAY)
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# if defined(solaris2)
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#  define O_NDELAY O_NONBLOCK
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# elif defined(RTEMS_NEWLIB)
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#  define O_NDELAY _FNBIO
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# endif
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#endif
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#if !defined(ENOTSUP)
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#define ENOTSUP EOPNOTSUPP
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#endif
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#include <errno.h>
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#include <string.h>                     /* strcmp */
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#include <unistd.h>
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#include <stdlib.h>                     /* calloc() */
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/*
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 *  Semaphore to protect the io table
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 */
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#define RTEMS_LIBIO_SEM         rtems_build_name('L', 'B', 'I', 'O')
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#define RTEMS_LIBIO_IOP_SEM(n)  rtems_build_name('L', 'B', 'I', n)
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extern rtems_id                          rtems_libio_semaphore;
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extern rtems_filesystem_file_handlers_r  rtems_filesystem_null_handlers;
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/*
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 *  File descriptor Table Information
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 */
64 
 
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extern unsigned32      rtems_libio_number_iops;
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extern rtems_libio_t  *rtems_libio_iops;
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extern rtems_libio_t  *rtems_libio_last_iop;
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extern rtems_libio_t *rtems_libio_iop_freelist;
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/*
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 *  set_errno_and_return_minus_one
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 *
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 *  Macro to ease common way to return an error.
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 */
75 
 
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#ifndef set_errno_and_return_minus_one
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#define set_errno_and_return_minus_one( _error ) \
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  do { errno = (_error); return -1; } while(0)
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#endif
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/*
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 *  rtems_libio_iop
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 *
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 *  Macro to return the file descriptor pointer.
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 */
86 
 
87 
#define rtems_libio_iop(_fd) \
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  ((((unsigned32)(_fd)) < rtems_libio_number_iops) ? \
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         &rtems_libio_iops[_fd] : 0)
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91 
/*
92 
 *  rtems_libio_check_is_open
93 
 *
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 *  Macro to check if a file descriptor is actually open.
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 */
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97 
#define rtems_libio_check_is_open(_iop) \
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  do {                                               \
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      if (((_iop)->flags & LIBIO_FLAGS_OPEN) == 0) { \
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          errno = EBADF;                             \
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          return -1;                                 \
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      }                                              \
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  } while (0)
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/*
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 *  rtems_libio_check_fd
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 *
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 *  Macro to check if a file descriptor number is valid.
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 */
110 
 
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#define rtems_libio_check_fd(_fd) \
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  do {                                                     \
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      if ((unsigned32) (_fd) >= rtems_libio_number_iops) { \
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          errno = EBADF;                                   \
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          return -1;                                       \
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      }                                                    \
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  } while (0)
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119 
/*
120 
 *  rtems_libio_check_buffer
121 
 *
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 *  Macro to check if a buffer pointer is valid.
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 */
124 
 
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#define rtems_libio_check_buffer(_buffer) \
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  do {                                    \
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      if ((_buffer) == 0) {               \
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          errno = EINVAL;                 \
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          return -1;                      \
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      }                                   \
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  } while (0)
132 
 
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/*
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 *  rtems_libio_check_count
135 
 *
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 *  Macro to check if a count or length is valid.
137 
 */
138 
 
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#define rtems_libio_check_count(_count) \
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  do {                                  \
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      if ((_count) == 0) {              \
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          return 0;                     \
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      }                                 \
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  } while (0)
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/*
147 
 *  rtems_libio_check_permissions
148 
 *
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 *  Macro to check if a file descriptor is open for this operation.
150 
 */
151 
 
152 
#define rtems_libio_check_permissions(_iop, _flag)    \
153 
  do {                                                \
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      if (((_iop)->flags & (_flag)) == 0) {           \
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            set_errno_and_return_minus_one( EINVAL ); \
156 
            return -1;                                \
157 
      }                                               \
158 
  } while (0)
159 
 
160 
/*
161 
 *  rtems_filesystem_freenode
162 
 *
163 
 *  Macro to free a node.
164 
 */
165 
 
166 
#define rtems_filesystem_freenode( _node ) \
167 
  do { \
168 
    if ( (_node)->ops )\
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      if ( (_node)->ops->freenod_h ) \
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        (*(_node)->ops->freenod_h)( (_node) ); \
171 
  } while (0)
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/*
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 *  rtems_filesystem_is_separator
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 *
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 *  Macro to determine if a character is a path name separator.
177 
 *
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 *  NOTE:  This macro handles MS-DOS and UNIX style names.
179 
 */
180 
 
181 
#define rtems_filesystem_is_separator( _ch ) \
182 
   ( ((_ch) == '/') || ((_ch) == '\\') || ((_ch) == '\0'))
183 
 
184 
/*
185 
 *  rtems_filesystem_get_start_loc
186 
 *
187 
 *  Macro to determine if path is absolute or relative.
188 
 */
189 
 
190 
#define rtems_filesystem_get_start_loc( _path, _index, _loc )  \
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  do {                                                         \
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    if ( rtems_filesystem_is_separator( (_path)[ 0 ] ) ) {     \
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      *(_loc) = rtems_filesystem_root;                         \
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      *(_index) = 1;                                           \
195 
    } else {                                                   \
196 
      *(_loc) = rtems_filesystem_current;                      \
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      *(_index) = 0;                                           \
198 
    }                                                          \
199 
  } while (0)
200 
 
201 
#define rtems_filesystem_get_sym_start_loc( _path, _index, _loc )  \
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  do {                                                         \
203 
    if ( rtems_filesystem_is_separator( (_path)[ 0 ] ) ) {     \
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      *(_loc) = rtems_filesystem_root;                         \
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      *(_index) = 1;                                           \
206 
    } else {                                                   \
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      *(_index) = 0;                                           \
208 
    }                                                          \
209 
  } while (0)
210 
 
211 
 
212 
/*
213 
 *  External structures
214 
 */
215 
#if !defined(LOGIN_NAME_MAX)
216 
#if defined(__linux__)
217 
#define LOGIN_NAME_MAX _POSIX_LOGIN_NAME_MAX
218 
#else
219 
#error "don't know how to set LOGIN_NAME_MAX"
220 
#endif
221 
#endif
222 
 
223 
typedef struct {
224 
 rtems_id                         task_id;
225 
 rtems_filesystem_location_info_t current_directory;
226 
 rtems_filesystem_location_info_t root_directory;
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 /* Default mode for all files. */
228 
 mode_t                           umask;
229 
 nlink_t                          link_counts;
230 
 /* _POSIX_types */
231 
 uid_t                            uid;
232 
 gid_t                            gid;
233 
 uid_t                            euid;
234 
 gid_t                            egid;
235 
 char      login_buffer[LOGIN_NAME_MAX];
236 
 
237 
 pid_t                            pgrp; /* process group id */
238 
} rtems_user_env_t;
239 
 
240 
extern rtems_user_env_t * rtems_current_user_env;
241 
extern rtems_user_env_t   rtems_global_user_env;
242 
 
243 
#define rtems_filesystem_current     (rtems_current_user_env->current_directory)
244 
#define rtems_filesystem_root        (rtems_current_user_env->root_directory)
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#define rtems_filesystem_link_counts (rtems_current_user_env->link_counts)
246 
#define rtems_filesystem_umask       (rtems_current_user_env->umask)
247 
 
248 
#define _POSIX_types_Uid             (rtems_current_user_env->uid)
249 
#define _POSIX_types_Gid             (rtems_current_user_env->gid)
250 
#define _POSIX_types_Euid            (rtems_current_user_env->euid)
251 
#define _POSIX_types_Egid            (rtems_current_user_env->egid)
252 
#define _POSIX_types_Getlogin_buffer (rtems_current_user_env->login_buffer)
253 
 
254 
 
255 
/*
256 
 *  Instantiate a private copy of the per user information for the calling task.
257 
 */
258 
 
259 
rtems_status_code rtems_libio_set_private_env(void);
260 
rtems_status_code rtems_libio_share_private_env(rtems_id task_id) ;
261 
 
262 
 
263 
 
264 
/*
265 
 *  File Descriptor Routine Prototypes
266 
 */
267 
 
268 
rtems_libio_t *rtems_libio_allocate(void);
269 
 
270 
unsigned32 rtems_libio_fcntl_flags(
271 
  unsigned32 fcntl_flags
272 
);
273 
 
274 
unsigned32 rtems_libio_to_fcntl_flags(
275 
  unsigned32 flags
276 
);
277 
 
278 
void rtems_libio_free(
279 
  rtems_libio_t *iop
280 
);
281 
 
282 
int rtems_libio_is_open_files_in_fs(
283 
  rtems_filesystem_mount_table_entry_t *mt_entry
284 
);
285 
 
286 
int rtems_libio_is_file_open(
287 
  void  *node_access
288 
);
289 
 
290 
/*
291 
 *  File System Routine Prototypes
292 
 */
293 
 
294 
int rtems_filesystem_evaluate_path(
295 
  const char                        *pathname,
296 
  int                                flags,
297 
  rtems_filesystem_location_info_t  *pathloc,
298 
  int                                follow_link
299 
);
300 
 
301 
void rtems_filesystem_initialize();
302 
 
303 
int init_fs_mount_table();
304 
 
305 
#ifdef __cplusplus
306 
}
307 
#endif
308 
 
309 
#endif
310 
/* end of include file */

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