mbed_retarget.h

00001 /*
00002  * mbed Microcontroller Library
00003  * Copyright (c) 2006-2016 ARM Limited
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  *
00017  */
00018 
00019 #ifndef RETARGET_H
00020 #define RETARGET_H
00021 
00022 #if __cplusplus
00023 #include <cstdio>
00024 #else
00025 #include <stdio.h>
00026 #endif //__cplusplus
00027 #include <stdint.h>
00028 #include <stddef.h>
00029 
00030 /* Include logic for errno so we can get errno defined but not bring in error_t,
00031  * including errno here prevents an include later, which would redefine our
00032  * error codes
00033  */
00034 #ifndef __error_t_defined
00035 #define __error_t_defined 1
00036 #include <errno.h>
00037 #undef __error_t_defined
00038 #else
00039 #include <errno.h>
00040 #endif
00041 
00042 /* We can get the following standard types from sys/types for gcc, but we
00043  * need to define the types ourselves for the other compilers that normally
00044  * target embedded systems */
00045 typedef signed   int  ssize_t;  ///< Signed size type, usually encodes negative errors
00046 typedef signed   long off_t;    ///< Offset in a data stream
00047 typedef unsigned int  nfds_t;   ///< Number of file descriptors
00048 typedef unsigned long long fsblkcnt_t;  ///< Count of file system blocks
00049 #if defined(__ARMCC_VERSION) || !defined(__GNUC__)
00050 typedef unsigned int  mode_t;   ///< Mode for opening files
00051 typedef unsigned int  dev_t;    ///< Device ID type
00052 typedef unsigned long ino_t;    ///< File serial number
00053 typedef unsigned int  nlink_t;  ///< Number of links to a file
00054 typedef unsigned int  uid_t;    ///< User ID
00055 typedef unsigned int  gid_t;    ///< Group ID
00056 #endif
00057 
00058 /* Flags for open() and fcntl(GETFL/SETFL)
00059  * At present, fcntl only supports reading and writing O_NONBLOCK
00060  */
00061 #define O_RDONLY 0        ///< Open for reading
00062 #define O_WRONLY 1        ///< Open for writing
00063 #define O_RDWR   2        ///< Open for reading and writing
00064 #define O_NONBLOCK 0x0004 ///< Non-blocking mode
00065 #define O_APPEND   0x0008 ///< Set file offset to end of file prior to each write
00066 #define O_CREAT    0x0200 ///< Create file if it does not exist
00067 #define O_TRUNC    0x0400 ///< Truncate file to zero length
00068 #define O_EXCL     0x0800 ///< Fail if file exists
00069 #define O_BINARY   0x8000 ///< Open file in binary mode
00070 
00071 #define O_ACCMODE   (O_RDONLY|O_WRONLY|O_RDWR)
00072 
00073 #define NAME_MAX 255    ///< Maximum size of a name in a file path
00074 
00075 #define STDIN_FILENO  0
00076 #define STDOUT_FILENO 1
00077 #define STDERR_FILENO 2
00078 
00079 #include <time.h>
00080 
00081 /** \addtogroup platform */
00082 /** @{*/
00083 /**
00084  * \defgroup platform_retarget Retarget functions
00085  * @{
00086  */
00087 
00088 /* DIR declarations must also be here */
00089 #if __cplusplus
00090 namespace mbed {
00091 
00092 class FileHandle;
00093 class DirHandle;
00094 
00095 /** Targets may implement this to change stdin, stdout, stderr.
00096  *
00097  * If the application hasn't provided mbed_override_console, this is called
00098  * to give the target a chance to specify a FileHandle for the console.
00099  *
00100  * If this is not provided or returns NULL, the console will be:
00101  *   - UARTSerial if configuration option "platform.stdio-buffered-serial" is
00102  *     true and the target has DEVICE_SERIAL;
00103  *   - Raw HAL serial via serial_getc and serial_putc if
00104  *     "platform.stdio-buffered-serial" is false and the target has DEVICE_SERIAL;
00105  *   - stdout/stderr will be a sink and stdin will input a stream of 0s if the
00106  *     target does not have DEVICE_SERIAL.
00107  *
00108  * @param fd file descriptor - STDIN_FILENO, STDOUT_FILENO or STDERR_FILENO
00109  * @return  pointer to FileHandle to override normal stream otherwise NULL
00110  */
00111 FileHandle *mbed_target_override_console(int fd);
00112 
00113 /** Applications may implement this to change stdin, stdout, stderr.
00114  *
00115  * This hook gives the application a chance to specify a custom FileHandle
00116  * for the console.
00117  *
00118  * If this is not provided or returns NULL, the console will be specified
00119  * by mbed_target_override_console, else will default to serial - see
00120  * mbed_target_override_console for more details.
00121  *
00122  * Example:
00123  * @code
00124  * FileHandle* mbed::mbed_override_console(int) {
00125  *     static UARTSerial my_serial(D0, D1);
00126  *     return &my_serial;
00127  * }
00128  * @endcode
00129 
00130  * @param fd file descriptor - STDIN_FILENO, STDOUT_FILENO or STDERR_FILENO
00131  * @return  pointer to FileHandle to override normal stream otherwise NULL
00132  */
00133 FileHandle *mbed_override_console(int fd);
00134 
00135 }
00136 
00137 typedef mbed::DirHandle DIR;
00138 #else
00139 typedef struct Dir DIR;
00140 #endif
00141 
00142 /* The intent of this section is to unify the errno error values to match
00143  * the POSIX definitions for the GCC_ARM, ARMCC and IAR compilers. This is
00144  * necessary because the ARMCC/IAR errno.h, or sys/stat.h are missing some
00145  * symbol definitions used by the POSIX filesystem API to return errno codes.
00146  * Note also that ARMCC errno.h defines some symbol values differently from
00147  * the GCC_ARM/IAR/standard POSIX definitions. The definitions guard against
00148  * this and future changes by changing the symbol definition as shown below.
00149  */
00150 #undef  EPERM
00151 #define EPERM           1       /* Operation not permitted */
00152 #undef  ENOENT
00153 #define ENOENT          2       /* No such file or directory */
00154 #undef  ESRCH
00155 #define ESRCH           3       /* No such process */
00156 #undef  EINTR
00157 #define EINTR           4       /* Interrupted system call */
00158 #undef  EIO
00159 #define EIO             5       /* I/O error */
00160 #undef  ENXIO
00161 #define ENXIO           6       /* No such device or address */
00162 #undef  E2BIG
00163 #define E2BIG           7       /* Argument list too long */
00164 #undef  ENOEXEC
00165 #define ENOEXEC         8       /* Exec format error */
00166 #undef  EBADF
00167 #define EBADF           9       /* Bad file number */
00168 #undef  ECHILD
00169 #define ECHILD          10      /* No child processes */
00170 #undef  EAGAIN
00171 #define EAGAIN          11      /* Try again */
00172 #undef  ENOMEM
00173 #define ENOMEM          12      /* Out of memory */
00174 #undef  EACCES
00175 #define EACCES          13      /* Permission denied */
00176 #undef  EFAULT
00177 #define EFAULT          14      /* Bad address */
00178 #undef  ENOTBLK
00179 #define ENOTBLK         15      /* Block device required */
00180 #undef  EBUSY
00181 #define EBUSY           16      /* Device or resource busy */
00182 #undef  EEXIST
00183 #define EEXIST          17      /* File exists */
00184 #undef  EXDEV
00185 #define EXDEV           18      /* Cross-device link */
00186 #undef  ENODEV
00187 #define ENODEV          19      /* No such device */
00188 #undef  ENOTDIR
00189 #define ENOTDIR         20      /* Not a directory */
00190 #undef  EISDIR
00191 #define EISDIR          21      /* Is a directory */
00192 #undef  EINVAL
00193 #define EINVAL          22      /* Invalid argument */
00194 #undef  ENFILE
00195 #define ENFILE          23      /* File table overflow */
00196 #undef  EMFILE
00197 #define EMFILE          24      /* Too many open files */
00198 #undef  ENOTTY
00199 #define ENOTTY          25      /* Not a typewriter */
00200 #undef  ETXTBSY
00201 #define ETXTBSY         26      /* Text file busy */
00202 #undef  EFBIG
00203 #define EFBIG           27      /* File too large */
00204 #undef  ENOSPC
00205 #define ENOSPC          28      /* No space left on device */
00206 #undef  ESPIPE
00207 #define ESPIPE          29      /* Illegal seek */
00208 #undef  EROFS
00209 #define EROFS           30      /* Read-only file system */
00210 #undef  EMLINK
00211 #define EMLINK          31      /* Too many links */
00212 #undef  EPIPE
00213 #define EPIPE           32      /* Broken pipe */
00214 #undef  EDOM
00215 #define EDOM            33      /* Math argument out of domain of func */
00216 #undef  ERANGE
00217 #define ERANGE          34      /* Math result not representable */
00218 #undef  EDEADLK
00219 #define EDEADLK         35      /* Resource deadlock would occur */
00220 #undef  ENAMETOOLONG
00221 #define ENAMETOOLONG    36      /* File name too long */
00222 #undef  ENOLCK
00223 #define ENOLCK          37      /* No record locks available */
00224 #undef  ENOSYS
00225 #define ENOSYS          38      /* Function not implemented */
00226 #undef  ENOTEMPTY
00227 #define ENOTEMPTY       39      /* Directory not empty */
00228 #undef  ELOOP
00229 #define ELOOP           40      /* Too many symbolic links encountered */
00230 #undef  EWOULDBLOCK
00231 #define EWOULDBLOCK     EAGAIN  /* Operation would block */
00232 #undef  ENOMSG
00233 #define ENOMSG          42      /* No message of desired type */
00234 #undef  EIDRM
00235 #define EIDRM           43      /* Identifier removed */
00236 #undef  ECHRNG
00237 #define ECHRNG          44      /* Channel number out of range */
00238 #undef  EL2NSYNC
00239 #define EL2NSYNC        45      /* Level 2 not synchronized */
00240 #undef  EL3HLT
00241 #define EL3HLT          46      /* Level 3 halted */
00242 #undef  EL3RST
00243 #define EL3RST          47      /* Level 3 reset */
00244 #undef  ELNRNG
00245 #define ELNRNG          48      /* Link number out of range */
00246 #undef  EUNATCH
00247 #define EUNATCH         49      /* Protocol driver not attached */
00248 #undef  ENOCSI
00249 #define ENOCSI          50      /* No CSI structure available */
00250 #undef  EL2HLT
00251 #define EL2HLT          51      /* Level 2 halted */
00252 #undef  EBADE
00253 #define EBADE           52      /* Invalid exchange */
00254 #undef  EBADR
00255 #define EBADR           53      /* Invalid request descriptor */
00256 #undef  EXFULL
00257 #define EXFULL          54      /* Exchange full */
00258 #undef  ENOANO
00259 #define ENOANO          55      /* No anode */
00260 #undef  EBADRQC
00261 #define EBADRQC         56      /* Invalid request code */
00262 #undef  EBADSLT
00263 #define EBADSLT         57      /* Invalid slot */
00264 #undef  EDEADLOCK
00265 #define EDEADLOCK       EDEADLK /* Resource deadlock would occur */
00266 #undef  EBFONT
00267 #define EBFONT          59      /* Bad font file format */
00268 #undef  ENOSTR
00269 #define ENOSTR          60      /* Device not a stream */
00270 #undef  ENODATA
00271 #define ENODATA         61      /* No data available */
00272 #undef  ETIME
00273 #define ETIME           62      /* Timer expired */
00274 #undef  ENOSR
00275 #define ENOSR           63      /* Out of streams resources */
00276 #undef  ENONET
00277 #define ENONET          64      /* Machine is not on the network */
00278 #undef  ENOPKG
00279 #define ENOPKG          65      /* Package not installed */
00280 #undef  EREMOTE
00281 #define EREMOTE         66      /* Object is remote */
00282 #undef  ENOLINK
00283 #define ENOLINK         67      /* Link has been severed */
00284 #undef  EADV
00285 #define EADV            68      /* Advertise error */
00286 #undef  ESRMNT
00287 #define ESRMNT          69      /* Srmount error */
00288 #undef  ECOMM
00289 #define ECOMM           70      /* Communication error on send */
00290 #undef  EPROTO
00291 #define EPROTO          71      /* Protocol error */
00292 #undef  EMULTIHOP
00293 #define EMULTIHOP       72      /* Multihop attempted */
00294 #undef  EDOTDOT
00295 #define EDOTDOT         73      /* RFS specific error */
00296 #undef  EBADMSG
00297 #define EBADMSG         74      /* Not a data message */
00298 #undef  EOVERFLOW
00299 #define EOVERFLOW       75      /* Value too large for defined data type */
00300 #undef  ENOTUNIQ
00301 #define ENOTUNIQ        76      /* Name not unique on network */
00302 #undef  EBADFD
00303 #define EBADFD          77      /* File descriptor in bad state */
00304 #undef  EREMCHG
00305 #define EREMCHG         78      /* Remote address changed */
00306 #undef  ELIBACC
00307 #define ELIBACC         79      /* Can not access a needed shared library */
00308 #undef  ELIBBAD
00309 #define ELIBBAD         80      /* Accessing a corrupted shared library */
00310 #undef  ELIBSCN
00311 #define ELIBSCN         81      /* .lib section in a.out corrupted */
00312 #undef  ELIBMAX
00313 #define ELIBMAX         82      /* Attempting to link in too many shared libraries */
00314 #undef  ELIBEXEC
00315 #define ELIBEXEC        83      /* Cannot exec a shared library directly */
00316 #undef  EILSEQ
00317 #define EILSEQ          84      /* Illegal byte sequence */
00318 #undef  ERESTART
00319 #define ERESTART        85      /* Interrupted system call should be restarted */
00320 #undef  ESTRPIPE
00321 #define ESTRPIPE        86      /* Streams pipe error */
00322 #undef  EUSERS
00323 #define EUSERS          87      /* Too many users */
00324 #undef  ENOTSOCK
00325 #define ENOTSOCK        88      /* Socket operation on non-socket */
00326 #undef  EDESTADDRREQ
00327 #define EDESTADDRREQ    89      /* Destination address required */
00328 #undef  EMSGSIZE
00329 #define EMSGSIZE        90      /* Message too long */
00330 #undef  EPROTOTYPE
00331 #define EPROTOTYPE      91      /* Protocol wrong type for socket */
00332 #undef  ENOPROTOOPT
00333 #define ENOPROTOOPT     92      /* Protocol not available */
00334 #undef  EPROTONOSUPPORT
00335 #define EPROTONOSUPPORT 93      /* Protocol not supported */
00336 #undef  ESOCKTNOSUPPORT
00337 #define ESOCKTNOSUPPORT 94      /* Socket type not supported */
00338 #undef  EOPNOTSUPP
00339 #define EOPNOTSUPP      95      /* Operation not supported on transport endpoint */
00340 #undef  EPFNOSUPPORT
00341 #define EPFNOSUPPORT    96      /* Protocol family not supported */
00342 #undef  EAFNOSUPPORT
00343 #define EAFNOSUPPORT    97      /* Address family not supported by protocol */
00344 #undef  EADDRINUSE
00345 #define EADDRINUSE      98      /* Address already in use */
00346 #undef  EADDRNOTAVAIL
00347 #define EADDRNOTAVAIL   99      /* Cannot assign requested address */
00348 #undef  ENETDOWN
00349 #define ENETDOWN        100     /* Network is down */
00350 #undef  ENETUNREACH
00351 #define ENETUNREACH     101     /* Network is unreachable */
00352 #undef  ENETRESET
00353 #define ENETRESET       102     /* Network dropped connection because of reset */
00354 #undef  ECONNABORTED
00355 #define ECONNABORTED    103     /* Software caused connection abort */
00356 #undef  ECONNRESET
00357 #define ECONNRESET      104     /* Connection reset by peer */
00358 #undef  ENOBUFS
00359 #define ENOBUFS         105     /* No buffer space available */
00360 #undef  EISCONN
00361 #define EISCONN         106     /* Transport endpoint is already connected */
00362 #undef  ENOTCONN
00363 #define ENOTCONN        107     /* Transport endpoint is not connected */
00364 #undef  ESHUTDOWN
00365 #define ESHUTDOWN       108     /* Cannot send after transport endpoint shutdown */
00366 #undef  ETOOMANYREFS
00367 #define ETOOMANYREFS    109     /* Too many references: cannot splice */
00368 #undef  ETIMEDOUT
00369 #define ETIMEDOUT       110     /* Connection timed out */
00370 #undef  ECONNREFUSED
00371 #define ECONNREFUSED    111     /* Connection refused */
00372 #undef  EHOSTDOWN
00373 #define EHOSTDOWN       112     /* Host is down */
00374 #undef  EHOSTUNREACH
00375 #define EHOSTUNREACH    113     /* No route to host */
00376 #undef  EALREADY
00377 #define EALREADY        114     /* Operation already in progress */
00378 #undef  EINPROGRESS
00379 #define EINPROGRESS     115     /* Operation now in progress */
00380 #undef  ESTALE
00381 #define ESTALE          116     /* Stale NFS file handle */
00382 #undef  EUCLEAN
00383 #define EUCLEAN         117     /* Structure needs cleaning */
00384 #undef  ENOTNAM
00385 #define ENOTNAM         118     /* Not a XENIX named type file */
00386 #undef  ENAVAIL
00387 #define ENAVAIL         119     /* No XENIX semaphores available */
00388 #undef  EISNAM
00389 #define EISNAM          120     /* Is a named type file */
00390 #undef  EREMOTEIO
00391 #define EREMOTEIO       121     /* Remote I/O error */
00392 #undef  EDQUOT
00393 #define EDQUOT          122     /* Quota exceeded */
00394 #undef  ENOMEDIUM
00395 #define ENOMEDIUM       123     /* No medium found */
00396 #undef  EMEDIUMTYPE
00397 #define EMEDIUMTYPE     124     /* Wrong medium type */
00398 #undef  ECANCELED
00399 #define ECANCELED       125     /* Operation Canceled */
00400 #undef  ENOKEY
00401 #define ENOKEY          126     /* Required key not available */
00402 #undef  EKEYEXPIRED
00403 #define EKEYEXPIRED     127     /* Key has expired */
00404 #undef  EKEYREVOKED
00405 #define EKEYREVOKED     128     /* Key has been revoked */
00406 #undef  EKEYREJECTED
00407 #define EKEYREJECTED    129     /* Key was rejected by service */
00408 #undef  EOWNERDEAD
00409 #define EOWNERDEAD      130     /* Owner died */
00410 #undef  ENOTRECOVERABLE
00411 #define ENOTRECOVERABLE 131     /* State not recoverable */
00412 
00413 /* Missing stat.h defines.
00414  * The following are sys/stat.h definitions not currently present in the ARMCC
00415  * errno.h. Note, ARMCC errno.h defines some symbol values differing from
00416  * GCC_ARM/IAR/standard POSIX definitions. Guard against this and future
00417  * changes by changing the symbol definition for filesystem use.
00418  */
00419 #define     _IFMT   0170000 //< type of file
00420 #define     _IFSOCK 0140000 //< socket
00421 #define     _IFLNK  0120000 //< symbolic link
00422 #define     _IFREG  0100000 //< regular
00423 #define     _IFBLK  0060000 //< block special
00424 #define     _IFDIR  0040000 //< directory
00425 #define     _IFCHR  0020000 //< character special
00426 #define     _IFIFO  0010000 //< fifo special
00427 
00428 #define S_IFMT      _IFMT   //< type of file
00429 #define S_IFSOCK    _IFSOCK //< socket
00430 #define S_IFLNK     _IFLNK  //< symbolic link
00431 #define S_IFREG     _IFREG  //< regular
00432 #define S_IFBLK     _IFBLK  //< block special
00433 #define S_IFDIR     _IFDIR  //< directory
00434 #define S_IFCHR     _IFCHR  //< character special
00435 #define S_IFIFO     _IFIFO  //< fifo special
00436 
00437 #define S_IRWXU     (S_IRUSR | S_IWUSR | S_IXUSR)
00438 #define     S_IRUSR 0000400 ///< read permission, owner
00439 #define     S_IWUSR 0000200 ///< write permission, owner
00440 #define     S_IXUSR 0000100 ///< execute/search permission, owner
00441 #define S_IRWXG     (S_IRGRP | S_IWGRP | S_IXGRP)
00442 #define     S_IRGRP 0000040 ///< read permission, group
00443 #define     S_IWGRP 0000020 ///< write permission, group
00444 #define     S_IXGRP 0000010 ///< execute/search permission, group
00445 #define S_IRWXO     (S_IROTH | S_IWOTH | S_IXOTH)
00446 #define     S_IROTH 0000004 ///< read permission, other
00447 #define     S_IWOTH 0000002 ///< write permission, other
00448 #define     S_IXOTH 0000001 ///< execute/search permission, other
00449 
00450 /* Refer to sys/stat standard
00451  * Note: Not all fields may be supported by the underlying filesystem
00452  */
00453 struct stat {
00454     dev_t     st_dev;     ///< Device ID containing file
00455     ino_t     st_ino;     ///< File serial number
00456     mode_t    st_mode;    ///< Mode of file
00457     nlink_t   st_nlink;   ///< Number of links to file
00458 
00459     uid_t     st_uid;     ///< User ID
00460     gid_t     st_gid;     ///< Group ID
00461 
00462     off_t     st_size;    ///< Size of file in bytes
00463 
00464     time_t    st_atime;   ///< Time of last access
00465     time_t    st_mtime;   ///< Time of last data modification
00466     time_t    st_ctime;   ///< Time of last status change
00467 };
00468 
00469 struct statvfs {
00470     unsigned long  f_bsize;    ///< Filesystem block size
00471     unsigned long  f_frsize;   ///< Fragment size (block size)
00472 
00473     fsblkcnt_t     f_blocks;   ///< Number of blocks
00474     fsblkcnt_t     f_bfree;    ///< Number of free blocks
00475     fsblkcnt_t     f_bavail;   ///< Number of free blocks for unprivileged users
00476 
00477     unsigned long  f_fsid;     ///< Filesystem ID
00478 
00479     unsigned long  f_namemax;  ///< Maximum filename length
00480 };
00481 
00482 /* The following are dirent.h definitions are declared here to guarantee
00483  * consistency where structure may be different with different toolchains
00484  */
00485 struct dirent {
00486     char d_name[NAME_MAX + 1]; ///< Name of file
00487     uint8_t d_type;          ///< Type of file
00488 };
00489 
00490 enum {
00491     DT_UNKNOWN, ///< The file type could not be determined.
00492     DT_FIFO,    ///< This is a named pipe (FIFO).
00493     DT_CHR,     ///< This is a character device.
00494     DT_DIR,     ///< This is a directory.
00495     DT_BLK,     ///< This is a block device.
00496     DT_REG,     ///< This is a regular file.
00497     DT_LNK,     ///< This is a symbolic link.
00498     DT_SOCK,    ///< This is a UNIX domain socket.
00499 };
00500 
00501 /* fcntl.h defines */
00502 #define F_GETFL 3
00503 #define F_SETFL 4
00504 
00505 struct pollfd {
00506     int fd;
00507     short events;
00508     short revents;
00509 };
00510 
00511 /* POSIX-compatible I/O functions */
00512 #if __cplusplus
00513 extern "C" {
00514 #endif
00515     int open(const char *path, int oflag, ...);
00516 #ifndef __IAR_SYSTEMS_ICC__ /* IAR provides fdopen itself */
00517 #if __cplusplus
00518     std::FILE *fdopen(int fildes, const char *mode);
00519 #else
00520     FILE *fdopen(int fildes, const char *mode);
00521 #endif
00522 #endif
00523     ssize_t write(int fildes, const void *buf, size_t nbyte);
00524     ssize_t read(int fildes, void *buf, size_t nbyte);
00525     off_t lseek(int fildes, off_t offset, int whence);
00526     int isatty(int fildes);
00527     int fsync(int fildes);
00528     int fstat(int fildes, struct stat *st);
00529     int fcntl(int fildes, int cmd, ...);
00530     int poll(struct pollfd fds[], nfds_t nfds, int timeout);
00531     int close(int fildes);
00532     int stat(const char *path, struct stat *st);
00533     int statvfs(const char *path, struct statvfs *buf);
00534     DIR *opendir(const char *);
00535     struct dirent *readdir(DIR *);
00536     int closedir(DIR *);
00537     void rewinddir(DIR *);
00538     long telldir(DIR *);
00539     void seekdir(DIR *, long);
00540     int mkdir(const char *name, mode_t n);
00541 #if __cplusplus
00542 }; // extern "C"
00543 
00544 namespace mbed {
00545 
00546 /** This call is an analogue to POSIX fdopen().
00547  *
00548  *  It associates a C stream to an already-opened FileHandle, to allow you to
00549  *  use C printf/scanf/fwrite etc. The provided FileHandle must remain open -
00550  *  it will be closed by the C library when fclose(FILE) is called.
00551  *
00552  *  The net effect is fdopen(bind_to_fd(fh), mode), with error handling.
00553  *
00554  *  @param fh       a pointer to an opened FileHandle
00555  *  @param mode     operation upon the file descriptor, e.g., "w+"
00556  *
00557  *  @returns        a pointer to FILE
00558  */
00559 std::FILE *fdopen(mbed::FileHandle *fh, const char *mode);
00560 
00561 /** Bind an mbed FileHandle to a POSIX file descriptor
00562  *
00563  * This is similar to fdopen, but only operating at the POSIX layer - it
00564  * associates a POSIX integer file descriptor with a FileHandle, to allow you
00565  * to use POSIX read/write calls etc. The provided FileHandle must remain open -
00566  * it will be closed when close(int) is called.
00567  *
00568  *  @param fh       a pointer to an opened FileHandle
00569  *
00570  *  @return         an integer file descriptor, or negative if no descriptors available
00571  */
00572 int bind_to_fd(mbed::FileHandle *fh);
00573 
00574 } // namespace mbed
00575 
00576 #endif // __cplusplus
00577 
00578 /**@}*/
00579 
00580 /**@}*/
00581 
00582 #endif /* RETARGET_H */