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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [libio_.h] - Blame information for rev 846

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/*
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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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 *  $Id: libio_.h,v 1.2 2001-09-27 12:01:15 chris Exp $
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 */
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#ifndef __LIBIO__h
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#define __LIBIO__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 <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 <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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 */
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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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 *  Default mode for all files.
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 */
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extern mode_t    rtems_filesystem_umask;
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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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 */
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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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 */
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#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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/*
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 *  rtems_libio_check_is_open
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 *
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 *  Macro to check if a file descriptor is actually open.
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 */
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#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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 */
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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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/*
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 *  rtems_libio_check_buffer
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 *
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 *  Macro to check if a buffer pointer is valid.
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 */
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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)
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/*
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 *  rtems_libio_check_count
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 *
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 *  Macro to check if a count or length is valid.
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 */
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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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/*
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 *  rtems_libio_check_permissions
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 *
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 *  Macro to check if a file descriptor is open for this operation.
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 */
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#define rtems_libio_check_permissions(_iop, _flag)    \
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  do {                                                \
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      if (((_iop)->flags & (_flag)) == 0) {           \
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            set_errno_and_return_minus_one( EINVAL ); \
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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_filesystem_freenode
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 *
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 *  Macro to free a node.
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 */
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#define rtems_filesystem_freenode( _node ) \
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  do { \
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    if ( (_node)->ops->freenod ) \
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      (*(_node)->ops->freenod)( (_node) ); \
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  } 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.
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 *
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 *  NOTE:  This macro handles MS-DOS and UNIX style names.
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 */
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#define rtems_filesystem_is_separator( _ch ) \
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   ( ((_ch) == '/') || ((_ch) == '\\') || ((_ch) == '\0'))
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/*
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 *  rtems_filesystem_get_start_loc
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 *
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 *  Macro to determine if path is absolute or relative.
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 */
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#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;                                           \
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    } else {                                                   \
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      *(_loc) = rtems_filesystem_current;                      \
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      *(_index) = 0;                                           \
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    }                                                          \
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  } while (0)
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#define rtems_filesystem_get_sym_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;                                           \
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    } else {                                                   \
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      *(_index) = 0;                                           \
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    }                                                          \
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  } while (0)
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/*
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 *  External structures
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 */
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extern rtems_filesystem_location_info_t rtems_filesystem_current;
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extern rtems_filesystem_location_info_t rtems_filesystem_root;
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extern nlink_t                          rtems_filesystem_link_counts;
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222
 
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/*
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 *  File Descriptor Routine Prototypes
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 */
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rtems_libio_t *rtems_libio_allocate(void);
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229
unsigned32 rtems_libio_fcntl_flags(
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  unsigned32 fcntl_flags
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);
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unsigned32 rtems_libio_to_fcntl_flags(
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  unsigned32 flags
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);
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void rtems_libio_free(
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  rtems_libio_t *iop
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);
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int rtems_libio_is_open_files_in_fs(
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  rtems_filesystem_mount_table_entry_t *mt_entry
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);
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245
int rtems_libio_is_file_open(
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  void  *node_access
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);
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/*
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 *  File System Routine Prototypes
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 */
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253
int rtems_filesystem_evaluate_path(
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  const char                        *pathname,
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  int                                flags,
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  rtems_filesystem_location_info_t  *pathloc,
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  int                                follow_link
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);
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260
void rtems_filesystem_initialize();
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262
int init_fs_mount_table();
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#ifdef __cplusplus
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}
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#endif
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#endif
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/* end of include file */
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