1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 * @brief APR File I/O Handling
26 #include "apr_pools.h"
28 #include "apr_errno.h"
29 #include "apr_file_info.h"
30 #include "apr_inherit.h"
32 #define APR_WANT_STDIO /**< for SEEK_* */
33 #define APR_WANT_IOVEC /**< for apr_file_writev */
38 #endif /* __cplusplus */
41 * @defgroup apr_file_io File I/O Handling Functions
47 * @defgroup apr_file_open_flags File Open Flags/Routines
51 /* Note to implementors: Values in the range 0x00100000--0x80000000
52 are reserved for platform-specific values. */
54 #define APR_FOPEN_READ 0x00001 /**< Open the file for reading */
55 #define APR_FOPEN_WRITE 0x00002 /**< Open the file for writing */
56 #define APR_FOPEN_CREATE 0x00004 /**< Create the file if not there */
57 #define APR_FOPEN_APPEND 0x00008 /**< Append to the end of the file */
58 #define APR_FOPEN_TRUNCATE 0x00010 /**< Open the file and truncate
60 #define APR_FOPEN_BINARY 0x00020 /**< Open the file in binary mode */
61 #define APR_FOPEN_EXCL 0x00040 /**< Open should fail if APR_CREATE
63 #define APR_FOPEN_BUFFERED 0x00080 /**< Open the file for buffered I/O */
64 #define APR_FOPEN_DELONCLOSE 0x00100 /**< Delete the file after close */
65 #define APR_FOPEN_XTHREAD 0x00200 /**< Platform dependent tag to open
66 the file for use across multiple
68 #define APR_FOPEN_SHARELOCK 0x00400 /**< Platform dependent support for
69 higher level locked read/write
70 access to support writes across
72 #define APR_FOPEN_NOCLEANUP 0x00800 /**< Do not register a cleanup
73 when the file is opened */
74 #define APR_FOPEN_SENDFILE_ENABLED 0x01000 /**< Advisory flag that this
76 apr_socket_sendfile operation */
77 #define APR_FOPEN_LARGEFILE 0x04000 /**< Platform dependent flag to enable
78 * large file support, see WARNING below
80 #define APR_FOPEN_SPARSE 0x08000 /**< Platform dependent flag to enable
81 * sparse file support, see WARNING below
85 #define APR_READ APR_FOPEN_READ /**< @deprecated @see APR_FOPEN_READ */
86 #define APR_WRITE APR_FOPEN_WRITE /**< @deprecated @see APR_FOPEN_WRITE */
87 #define APR_CREATE APR_FOPEN_CREATE /**< @deprecated @see APR_FOPEN_CREATE */
88 #define APR_APPEND APR_FOPEN_APPEND /**< @deprecated @see APR_FOPEN_APPEND */
89 #define APR_TRUNCATE APR_FOPEN_TRUNCATE /**< @deprecated @see APR_FOPEN_TRUNCATE */
90 #define APR_BINARY APR_FOPEN_BINARY /**< @deprecated @see APR_FOPEN_BINARY */
91 #define APR_EXCL APR_FOPEN_EXCL /**< @deprecated @see APR_FOPEN_EXCL */
92 #define APR_BUFFERED APR_FOPEN_BUFFERED /**< @deprecated @see APR_FOPEN_BUFFERED */
93 #define APR_DELONCLOSE APR_FOPEN_DELONCLOSE /**< @deprecated @see APR_FOPEN_DELONCLOSE */
94 #define APR_XTHREAD APR_FOPEN_XTHREAD /**< @deprecated @see APR_FOPEN_XTHREAD */
95 #define APR_SHARELOCK APR_FOPEN_SHARELOCK /**< @deprecated @see APR_FOPEN_SHARELOCK */
96 #define APR_FILE_NOCLEANUP APR_FOPEN_NOCLEANUP /**< @deprecated @see APR_FOPEN_NOCLEANUP */
97 #define APR_SENDFILE_ENABLED APR_FOPEN_SENDFILE_ENABLED /**< @deprecated @see APR_FOPEN_SENDFILE_ENABLED */
98 #define APR_LARGEFILE APR_FOPEN_LARGEFILE /**< @deprecated @see APR_FOPEN_LARGEFILE */
100 /** @warning APR_FOPEN_LARGEFILE flag only has effect on some
101 * platforms where sizeof(apr_off_t) == 4. Where implemented, it
102 * allows opening and writing to a file which exceeds the size which
103 * can be represented by apr_off_t (2 gigabytes). When a file's size
104 * does exceed 2Gb, apr_file_info_get() will fail with an error on the
105 * descriptor, likewise apr_stat()/apr_lstat() will fail on the
106 * filename. apr_dir_read() will fail with APR_INCOMPLETE on a
107 * directory entry for a large file depending on the particular
108 * APR_FINFO_* flags. Generally, it is not recommended to use this
111 * @warning APR_FOPEN_SPARSE may, depending on platform, convert a
112 * normal file to a sparse file. Some applications may be unable
113 * to decipher a sparse file, so it's critical that the sparse file
114 * flag should only be used for files accessed only by APR or other
115 * applications known to be able to decipher them. APR does not
116 * guarantee that it will compress the file into sparse segments
117 * if it was previously created and written without the sparse flag.
118 * On platforms which do not understand, or on file systems which
119 * cannot handle sparse files, the flag is ignored by apr_file_open().
125 * @defgroup apr_file_seek_flags File Seek Flags
129 /* flags for apr_file_seek */
130 /** Set the file position */
131 #define APR_SET SEEK_SET
133 #define APR_CUR SEEK_CUR
134 /** Go to end of file */
135 #define APR_END SEEK_END
139 * @defgroup apr_file_attrs_set_flags File Attribute Flags
143 /* flags for apr_file_attrs_set */
144 #define APR_FILE_ATTR_READONLY 0x01 /**< File is read-only */
145 #define APR_FILE_ATTR_EXECUTABLE 0x02 /**< File is executable */
146 #define APR_FILE_ATTR_HIDDEN 0x04 /**< File is hidden */
150 * @defgroup apr_file_writev{_full} max iovec size
154 #define APR_MAX_IOVEC_SIZE 1024 /**< System dependent maximum
155 size of an iovec array */
156 #elif defined(IOV_MAX)
157 #define APR_MAX_IOVEC_SIZE IOV_MAX
158 #elif defined(MAX_IOVEC)
159 #define APR_MAX_IOVEC_SIZE MAX_IOVEC
161 #define APR_MAX_IOVEC_SIZE 1024
165 /** File attributes */
166 typedef apr_uint32_t apr_fileattrs_t;
168 /** Type to pass as whence argument to apr_file_seek. */
169 typedef int apr_seek_where_t;
172 * Structure for referencing files.
174 typedef struct apr_file_t apr_file_t;
176 /* File lock types/flags */
178 * @defgroup apr_file_lock_types File Lock Types
182 #define APR_FLOCK_SHARED 1 /**< Shared lock. More than one process
183 or thread can hold a shared lock
184 at any given time. Essentially,
185 this is a "read lock", preventing
186 writers from establishing an
188 #define APR_FLOCK_EXCLUSIVE 2 /**< Exclusive lock. Only one process
189 may hold an exclusive lock at any
190 given time. This is analogous to
193 #define APR_FLOCK_TYPEMASK 0x000F /**< mask to extract lock type */
194 #define APR_FLOCK_NONBLOCK 0x0010 /**< do not block while acquiring the
199 * Open the specified file.
200 * @param newf The opened file descriptor.
201 * @param fname The full path to the file (using / on all systems)
202 * @param flag Or'ed value of:
204 * APR_READ open for reading
205 * APR_WRITE open for writing
206 * APR_CREATE create the file if not there
207 * APR_APPEND file ptr is set to end prior to all writes
208 * APR_TRUNCATE set length to zero if file exists
209 * APR_BINARY not a text file (This flag is ignored on
210 * UNIX because it has no meaning)
211 * APR_BUFFERED buffer the data. Default is non-buffered
212 * APR_EXCL return error if APR_CREATE and file exists
213 * APR_DELONCLOSE delete the file after closing.
214 * APR_XTHREAD Platform dependent tag to open the file
215 * for use across multiple threads
216 * APR_SHARELOCK Platform dependent support for higher
217 * level locked read/write access to support
218 * writes across process/machines
219 * APR_FILE_NOCLEANUP Do not register a cleanup with the pool
220 * passed in on the <EM>pool</EM> argument (see below).
221 * The apr_os_file_t handle in apr_file_t will not
222 * be closed when the pool is destroyed.
223 * APR_SENDFILE_ENABLED Open with appropriate platform semantics
224 * for sendfile operations. Advisory only,
225 * apr_socket_sendfile does not check this flag.
227 * @param perm Access permissions for file.
228 * @param pool The pool to use.
229 * @remark If perm is APR_OS_DEFAULT and the file is being created,
230 * appropriate default permissions will be used.
231 * @remark By default, the returned file descriptor will not be
232 * inherited by child processes created by apr_proc_create(). This
233 * can be changed using apr_file_inherit_set().
235 APR_DECLARE(apr_status_t) apr_file_open(apr_file_t **newf, const char *fname,
236 apr_int32_t flag, apr_fileperms_t perm,
240 * Close the specified file.
241 * @param file The file descriptor to close.
243 APR_DECLARE(apr_status_t) apr_file_close(apr_file_t *file);
246 * Delete the specified file.
247 * @param path The full path to the file (using / on all systems)
248 * @param pool The pool to use.
249 * @remark If the file is open, it won't be removed until all
250 * instances are closed.
252 APR_DECLARE(apr_status_t) apr_file_remove(const char *path, apr_pool_t *pool);
255 * Rename the specified file.
256 * @param from_path The full path to the original file (using / on all systems)
257 * @param to_path The full path to the new file (using / on all systems)
258 * @param pool The pool to use.
259 * @warning If a file exists at the new location, then it will be
260 * overwritten. Moving files or directories across devices may not be
263 APR_DECLARE(apr_status_t) apr_file_rename(const char *from_path,
268 * Create a hard link to the specified file.
269 * @param from_path The full path to the original file (using / on all systems)
270 * @param to_path The full path to the new file (using / on all systems)
271 * @remark Both files must reside on the same device.
273 APR_DECLARE(apr_status_t) apr_file_link(const char *from_path,
274 const char *to_path);
277 * Copy the specified file to another file.
278 * @param from_path The full path to the original file (using / on all systems)
279 * @param to_path The full path to the new file (using / on all systems)
280 * @param perms Access permissions for the new file if it is created.
281 * In place of the usual or'd combination of file permissions, the
282 * value APR_FILE_SOURCE_PERMS may be given, in which case the source
283 * file's permissions are copied.
284 * @param pool The pool to use.
285 * @remark The new file does not need to exist, it will be created if required.
286 * @warning If the new file already exists, its contents will be overwritten.
288 APR_DECLARE(apr_status_t) apr_file_copy(const char *from_path,
290 apr_fileperms_t perms,
294 * Append the specified file to another file.
295 * @param from_path The full path to the source file (use / on all systems)
296 * @param to_path The full path to the destination file (use / on all systems)
297 * @param perms Access permissions for the destination file if it is created.
298 * In place of the usual or'd combination of file permissions, the
299 * value APR_FILE_SOURCE_PERMS may be given, in which case the source
300 * file's permissions are copied.
301 * @param pool The pool to use.
302 * @remark The new file does not need to exist, it will be created if required.
304 APR_DECLARE(apr_status_t) apr_file_append(const char *from_path,
306 apr_fileperms_t perms,
310 * Are we at the end of the file
311 * @param fptr The apr file we are testing.
312 * @remark Returns APR_EOF if we are at the end of file, APR_SUCCESS otherwise.
314 APR_DECLARE(apr_status_t) apr_file_eof(apr_file_t *fptr);
317 * Open standard error as an apr file pointer.
318 * @param thefile The apr file to use as stderr.
319 * @param pool The pool to allocate the file out of.
321 * @remark The only reason that the apr_file_open_std* functions exist
322 * is that you may not always have a stderr/out/in on Windows. This
323 * is generally a problem with newer versions of Windows and services.
325 * @remark The other problem is that the C library functions generally work
326 * differently on Windows and Unix. So, by using apr_file_open_std*
327 * functions, you can get a handle to an APR struct that works with
328 * the APR functions which are supposed to work identically on all
331 APR_DECLARE(apr_status_t) apr_file_open_stderr(apr_file_t **thefile,
335 * open standard output as an apr file pointer.
336 * @param thefile The apr file to use as stdout.
337 * @param pool The pool to allocate the file out of.
339 * @remark See remarks for apr_file_open_stderr.
341 APR_DECLARE(apr_status_t) apr_file_open_stdout(apr_file_t **thefile,
345 * open standard input as an apr file pointer.
346 * @param thefile The apr file to use as stdin.
347 * @param pool The pool to allocate the file out of.
349 * @remark See remarks for apr_file_open_stderr.
351 APR_DECLARE(apr_status_t) apr_file_open_stdin(apr_file_t **thefile,
355 * open standard error as an apr file pointer, with flags.
356 * @param thefile The apr file to use as stderr.
357 * @param flags The flags to open the file with. Only the APR_EXCL,
358 * APR_BUFFERED, APR_XTHREAD, APR_SHARELOCK,
359 * APR_SENDFILE_ENABLED and APR_LARGEFILE flags should
360 * be used. The APR_WRITE flag will be set unconditionally.
361 * @param pool The pool to allocate the file out of.
363 * @remark See remarks for apr_file_open_stderr.
365 APR_DECLARE(apr_status_t) apr_file_open_flags_stderr(apr_file_t **thefile,
370 * open standard output as an apr file pointer, with flags.
371 * @param thefile The apr file to use as stdout.
372 * @param flags The flags to open the file with. Only the APR_EXCL,
373 * APR_BUFFERED, APR_XTHREAD, APR_SHARELOCK,
374 * APR_SENDFILE_ENABLED and APR_LARGEFILE flags should
375 * be used. The APR_WRITE flag will be set unconditionally.
376 * @param pool The pool to allocate the file out of.
378 * @remark See remarks for apr_file_open_stderr.
380 APR_DECLARE(apr_status_t) apr_file_open_flags_stdout(apr_file_t **thefile,
385 * open standard input as an apr file pointer, with flags.
386 * @param thefile The apr file to use as stdin.
387 * @param flags The flags to open the file with. Only the APR_EXCL,
388 * APR_BUFFERED, APR_XTHREAD, APR_SHARELOCK,
389 * APR_SENDFILE_ENABLED and APR_LARGEFILE flags should
390 * be used. The APR_READ flag will be set unconditionally.
391 * @param pool The pool to allocate the file out of.
393 * @remark See remarks for apr_file_open_stderr.
395 APR_DECLARE(apr_status_t) apr_file_open_flags_stdin(apr_file_t **thefile,
400 * Read data from the specified file.
401 * @param thefile The file descriptor to read from.
402 * @param buf The buffer to store the data to.
403 * @param nbytes On entry, the number of bytes to read; on exit, the number
406 * @remark apr_file_read will read up to the specified number of
407 * bytes, but never more. If there isn't enough data to fill that
408 * number of bytes, all of the available data is read. The third
409 * argument is modified to reflect the number of bytes read. If a
410 * char was put back into the stream via ungetc, it will be the first
411 * character returned.
413 * @remark It is not possible for both bytes to be read and an APR_EOF
414 * or other error to be returned. APR_EINTR is never returned.
416 APR_DECLARE(apr_status_t) apr_file_read(apr_file_t *thefile, void *buf,
420 * Write data to the specified file.
421 * @param thefile The file descriptor to write to.
422 * @param buf The buffer which contains the data.
423 * @param nbytes On entry, the number of bytes to write; on exit, the number
426 * @remark apr_file_write will write up to the specified number of
427 * bytes, but never more. If the OS cannot write that many bytes, it
428 * will write as many as it can. The third argument is modified to
429 * reflect the * number of bytes written.
431 * @remark It is possible for both bytes to be written and an error to
432 * be returned. APR_EINTR is never returned.
434 APR_DECLARE(apr_status_t) apr_file_write(apr_file_t *thefile, const void *buf,
438 * Write data from iovec array to the specified file.
439 * @param thefile The file descriptor to write to.
440 * @param vec The array from which to get the data to write to the file.
441 * @param nvec The number of elements in the struct iovec array. This must
442 * be smaller than APR_MAX_IOVEC_SIZE. If it isn't, the function
443 * will fail with APR_EINVAL.
444 * @param nbytes The number of bytes written.
446 * @remark It is possible for both bytes to be written and an error to
447 * be returned. APR_EINTR is never returned.
449 * @remark apr_file_writev is available even if the underlying
450 * operating system doesn't provide writev().
452 APR_DECLARE(apr_status_t) apr_file_writev(apr_file_t *thefile,
453 const struct iovec *vec,
454 apr_size_t nvec, apr_size_t *nbytes);
457 * Read data from the specified file, ensuring that the buffer is filled
459 * @param thefile The file descriptor to read from.
460 * @param buf The buffer to store the data to.
461 * @param nbytes The number of bytes to read.
462 * @param bytes_read If non-NULL, this will contain the number of bytes read.
464 * @remark apr_file_read will read up to the specified number of
465 * bytes, but never more. If there isn't enough data to fill that
466 * number of bytes, then the process/thread will block until it is
467 * available or EOF is reached. If a char was put back into the
468 * stream via ungetc, it will be the first character returned.
470 * @remark It is possible for both bytes to be read and an error to be
471 * returned. And if *bytes_read is less than nbytes, an accompanying
472 * error is _always_ returned.
474 * @remark APR_EINTR is never returned.
476 APR_DECLARE(apr_status_t) apr_file_read_full(apr_file_t *thefile, void *buf,
478 apr_size_t *bytes_read);
481 * Write data to the specified file, ensuring that all of the data is
482 * written before returning.
483 * @param thefile The file descriptor to write to.
484 * @param buf The buffer which contains the data.
485 * @param nbytes The number of bytes to write.
486 * @param bytes_written If non-NULL, set to the number of bytes written.
488 * @remark apr_file_write will write up to the specified number of
489 * bytes, but never more. If the OS cannot write that many bytes, the
490 * process/thread will block until they can be written. Exceptional
491 * error such as "out of space" or "pipe closed" will terminate with
494 * @remark It is possible for both bytes to be written and an error to
495 * be returned. And if *bytes_written is less than nbytes, an
496 * accompanying error is _always_ returned.
498 * @remark APR_EINTR is never returned.
500 APR_DECLARE(apr_status_t) apr_file_write_full(apr_file_t *thefile,
503 apr_size_t *bytes_written);
507 * Write data from iovec array to the specified file, ensuring that all of the
508 * data is written before returning.
509 * @param thefile The file descriptor to write to.
510 * @param vec The array from which to get the data to write to the file.
511 * @param nvec The number of elements in the struct iovec array. This must
512 * be smaller than APR_MAX_IOVEC_SIZE. If it isn't, the function
513 * will fail with APR_EINVAL.
514 * @param nbytes The number of bytes written.
516 * @remark apr_file_writev_full is available even if the underlying
517 * operating system doesn't provide writev().
519 APR_DECLARE(apr_status_t) apr_file_writev_full(apr_file_t *thefile,
520 const struct iovec *vec,
524 * Write a character into the specified file.
525 * @param ch The character to write.
526 * @param thefile The file descriptor to write to
528 APR_DECLARE(apr_status_t) apr_file_putc(char ch, apr_file_t *thefile);
531 * Read a character from the specified file.
532 * @param ch The character to read into
533 * @param thefile The file descriptor to read from
535 APR_DECLARE(apr_status_t) apr_file_getc(char *ch, apr_file_t *thefile);
538 * Put a character back onto a specified stream.
539 * @param ch The character to write.
540 * @param thefile The file descriptor to write to
542 APR_DECLARE(apr_status_t) apr_file_ungetc(char ch, apr_file_t *thefile);
545 * Read a line from the specified file
546 * @param str The buffer to store the string in.
547 * @param len The length of the string
548 * @param thefile The file descriptor to read from
549 * @remark The buffer will be NUL-terminated if any characters are stored.
550 * The newline at the end of the line will not be stripped.
552 APR_DECLARE(apr_status_t) apr_file_gets(char *str, int len,
553 apr_file_t *thefile);
556 * Write the string into the specified file.
557 * @param str The string to write.
558 * @param thefile The file descriptor to write to
560 APR_DECLARE(apr_status_t) apr_file_puts(const char *str, apr_file_t *thefile);
563 * Flush the file's buffer.
564 * @param thefile The file descriptor to flush
566 APR_DECLARE(apr_status_t) apr_file_flush(apr_file_t *thefile);
569 * Transfer all file modified data and metadata to disk.
570 * @param thefile The file descriptor to sync
572 APR_DECLARE(apr_status_t) apr_file_sync(apr_file_t *thefile);
575 * Transfer all file modified data to disk.
576 * @param thefile The file descriptor to sync
578 APR_DECLARE(apr_status_t) apr_file_datasync(apr_file_t *thefile);
581 * Duplicate the specified file descriptor.
582 * @param new_file The structure to duplicate into.
583 * @param old_file The file to duplicate.
584 * @param p The pool to use for the new file.
585 * @remark *new_file must point to a valid apr_file_t, or point to NULL.
587 APR_DECLARE(apr_status_t) apr_file_dup(apr_file_t **new_file,
588 apr_file_t *old_file,
592 * Duplicate the specified file descriptor and close the original
593 * @param new_file The old file that is to be closed and reused
594 * @param old_file The file to duplicate
595 * @param p The pool to use for the new file
597 * @remark new_file MUST point at a valid apr_file_t. It cannot be NULL.
599 APR_DECLARE(apr_status_t) apr_file_dup2(apr_file_t *new_file,
600 apr_file_t *old_file,
604 * Move the specified file descriptor to a new pool
605 * @param new_file Pointer in which to return the new apr_file_t
606 * @param old_file The file to move
607 * @param p The pool to which the descriptor is to be moved
608 * @remark Unlike apr_file_dup2(), this function doesn't do an
609 * OS dup() operation on the underlying descriptor; it just
610 * moves the descriptor's apr_file_t wrapper to a new pool.
611 * @remark The new pool need not be an ancestor of old_file's pool.
612 * @remark After calling this function, old_file may not be used
614 APR_DECLARE(apr_status_t) apr_file_setaside(apr_file_t **new_file,
615 apr_file_t *old_file,
619 * Give the specified apr file handle a new buffer
620 * @param thefile The file handle that is to be modified
621 * @param buffer The buffer
622 * @param bufsize The size of the buffer
623 * @remark It is possible to add a buffer to previously unbuffered
624 * file handles, the APR_BUFFERED flag will be added to
625 * the file handle's flags. Likewise, with buffer=NULL and
626 * bufsize=0 arguments it is possible to make a previously
627 * buffered file handle unbuffered.
629 APR_DECLARE(apr_status_t) apr_file_buffer_set(apr_file_t *thefile,
634 * Get the size of any buffer for the specified apr file handle
635 * @param thefile The file handle
637 APR_DECLARE(apr_size_t) apr_file_buffer_size_get(apr_file_t *thefile);
640 * Move the read/write file offset to a specified byte within a file.
641 * @param thefile The file descriptor
642 * @param where How to move the pointer, one of:
644 * APR_SET -- set the offset to offset
645 * APR_CUR -- add the offset to the current position
646 * APR_END -- add the offset to the current file size
648 * @param offset The offset to move the pointer to.
649 * @remark The third argument is modified to be the offset the pointer
650 was actually moved to.
652 APR_DECLARE(apr_status_t) apr_file_seek(apr_file_t *thefile,
653 apr_seek_where_t where,
657 * Create an anonymous pipe.
658 * @param in The newly created pipe's file for reading.
659 * @param out The newly created pipe's file for writing.
660 * @param pool The pool to operate on.
661 * @remark By default, the returned file descriptors will be inherited
662 * by child processes created using apr_proc_create(). This can be
663 * changed using apr_file_inherit_unset().
664 * @bug Some platforms cannot toggle between blocking and nonblocking,
665 * and when passing a pipe as a standard handle to an application which
666 * does not expect it, a non-blocking stream will fluxor the client app.
667 * @deprecated @see apr_file_pipe_create_ex
669 APR_DECLARE(apr_status_t) apr_file_pipe_create(apr_file_t **in,
674 * Create an anonymous pipe which portably supports async timeout options.
675 * @param in The newly created pipe's file for reading.
676 * @param out The newly created pipe's file for writing.
677 * @param blocking one of these values defined in apr_thread_proc.h;
678 * @param pool The pool to operate on.
685 * @remark By default, the returned file descriptors will be inherited
686 * by child processes created using apr_proc_create(). This can be
687 * changed using apr_file_inherit_unset().
688 * @remark Some platforms cannot toggle between blocking and nonblocking,
689 * and when passing a pipe as a standard handle to an application which
690 * does not expect it, a non-blocking stream will fluxor the client app.
691 * Use this function rather than apr_file_pipe_create to create pipes
692 * where one or both ends require non-blocking semantics.
694 APR_DECLARE(apr_status_t) apr_file_pipe_create_ex(apr_file_t **in,
696 apr_int32_t blocking,
700 * Create a named pipe.
701 * @param filename The filename of the named pipe
702 * @param perm The permissions for the newly created pipe.
703 * @param pool The pool to operate on.
705 APR_DECLARE(apr_status_t) apr_file_namedpipe_create(const char *filename,
706 apr_fileperms_t perm,
710 * Get the timeout value for a pipe or manipulate the blocking state.
711 * @param thepipe The pipe we are getting a timeout for.
712 * @param timeout The current timeout value in microseconds.
714 APR_DECLARE(apr_status_t) apr_file_pipe_timeout_get(apr_file_t *thepipe,
715 apr_interval_time_t *timeout);
718 * Set the timeout value for a pipe or manipulate the blocking state.
719 * @param thepipe The pipe we are setting a timeout on.
720 * @param timeout The timeout value in microseconds. Values < 0 mean wait
721 * forever, 0 means do not wait at all.
723 APR_DECLARE(apr_status_t) apr_file_pipe_timeout_set(apr_file_t *thepipe,
724 apr_interval_time_t timeout);
726 /** file (un)locking functions. */
729 * Establish a lock on the specified, open file. The lock may be advisory
730 * or mandatory, at the discretion of the platform. The lock applies to
731 * the file as a whole, rather than a specific range. Locks are established
732 * on a per-thread/process basis; a second lock by the same thread will not
734 * @param thefile The file to lock.
735 * @param type The type of lock to establish on the file.
737 APR_DECLARE(apr_status_t) apr_file_lock(apr_file_t *thefile, int type);
740 * Remove any outstanding locks on the file.
741 * @param thefile The file to unlock.
743 APR_DECLARE(apr_status_t) apr_file_unlock(apr_file_t *thefile);
745 /**accessor and general file_io functions. */
748 * return the file name of the current file.
749 * @param new_path The path of the file.
750 * @param thefile The currently open file.
752 APR_DECLARE(apr_status_t) apr_file_name_get(const char **new_path,
753 apr_file_t *thefile);
756 * Return the data associated with the current file.
757 * @param data The user data associated with the file.
758 * @param key The key to use for retrieving data associated with this file.
759 * @param file The currently open file.
761 APR_DECLARE(apr_status_t) apr_file_data_get(void **data, const char *key,
765 * Set the data associated with the current file.
766 * @param file The currently open file.
767 * @param data The user data to associate with the file.
768 * @param key The key to use for associating data with the file.
769 * @param cleanup The cleanup routine to use when the file is destroyed.
771 APR_DECLARE(apr_status_t) apr_file_data_set(apr_file_t *file, void *data,
773 apr_status_t (*cleanup)(void *));
776 * Write a string to a file using a printf format.
777 * @param fptr The file to write to.
778 * @param format The format string
779 * @param ... The values to substitute in the format string
780 * @return The number of bytes written
782 APR_DECLARE_NONSTD(int) apr_file_printf(apr_file_t *fptr,
783 const char *format, ...)
784 __attribute__((format(printf,2,3)));
787 * set the specified file's permission bits.
788 * @param fname The file (name) to apply the permissions to.
789 * @param perms The permission bits to apply to the file.
791 * @warning Some platforms may not be able to apply all of the
792 * available permission bits; APR_INCOMPLETE will be returned if some
793 * permissions are specified which could not be set.
795 * @warning Platforms which do not implement this feature will return
798 APR_DECLARE(apr_status_t) apr_file_perms_set(const char *fname,
799 apr_fileperms_t perms);
802 * Set attributes of the specified file.
803 * @param fname The full path to the file (using / on all systems)
804 * @param attributes Or'd combination of
806 * APR_FILE_ATTR_READONLY - make the file readonly
807 * APR_FILE_ATTR_EXECUTABLE - make the file executable
808 * APR_FILE_ATTR_HIDDEN - make the file hidden
810 * @param attr_mask Mask of valid bits in attributes.
811 * @param pool the pool to use.
812 * @remark This function should be used in preference to explicit manipulation
813 * of the file permissions, because the operations to provide these
814 * attributes are platform specific and may involve more than simply
815 * setting permission bits.
816 * @warning Platforms which do not implement this feature will return
819 APR_DECLARE(apr_status_t) apr_file_attrs_set(const char *fname,
820 apr_fileattrs_t attributes,
821 apr_fileattrs_t attr_mask,
825 * Set the mtime of the specified file.
826 * @param fname The full path to the file (using / on all systems)
827 * @param mtime The mtime to apply to the file.
828 * @param pool The pool to use.
829 * @warning Platforms which do not implement this feature will return
832 APR_DECLARE(apr_status_t) apr_file_mtime_set(const char *fname,
837 * Create a new directory on the file system.
838 * @param path the path for the directory to be created. (use / on all systems)
839 * @param perm Permissions for the new directory.
840 * @param pool the pool to use.
842 APR_DECLARE(apr_status_t) apr_dir_make(const char *path, apr_fileperms_t perm,
845 /** Creates a new directory on the file system, but behaves like
846 * 'mkdir -p'. Creates intermediate directories as required. No error
847 * will be reported if PATH already exists.
848 * @param path the path for the directory to be created. (use / on all systems)
849 * @param perm Permissions for the new directory.
850 * @param pool the pool to use.
852 APR_DECLARE(apr_status_t) apr_dir_make_recursive(const char *path,
853 apr_fileperms_t perm,
857 * Remove directory from the file system.
858 * @param path the path for the directory to be removed. (use / on all systems)
859 * @param pool the pool to use.
860 * @remark Removing a directory which is in-use (e.g., the current working
861 * directory, or during apr_dir_read, or with an open file) is not portable.
863 APR_DECLARE(apr_status_t) apr_dir_remove(const char *path, apr_pool_t *pool);
866 * get the specified file's stats.
867 * @param finfo Where to store the information about the file.
868 * @param wanted The desired apr_finfo_t fields, as a bit flag of APR_FINFO_ values
869 * @param thefile The file to get information about.
871 APR_DECLARE(apr_status_t) apr_file_info_get(apr_finfo_t *finfo,
873 apr_file_t *thefile);
877 * Truncate the file's length to the specified offset
878 * @param fp The file to truncate
879 * @param offset The offset to truncate to.
880 * @remark The read/write file offset is repositioned to offset.
882 APR_DECLARE(apr_status_t) apr_file_trunc(apr_file_t *fp, apr_off_t offset);
885 * Retrieve the flags that were passed into apr_file_open()
886 * when the file was opened.
887 * @return apr_int32_t the flags
889 APR_DECLARE(apr_int32_t) apr_file_flags_get(apr_file_t *f);
892 * Get the pool used by the file.
894 APR_POOL_DECLARE_ACCESSOR(file);
897 * Set a file to be inherited by child processes.
900 APR_DECLARE_INHERIT_SET(file);
903 * Unset a file from being inherited by child processes.
905 APR_DECLARE_INHERIT_UNSET(file);
908 * Open a temporary file
909 * @param fp The apr file to use as a temporary file.
910 * @param templ The template to use when creating a temp file.
911 * @param flags The flags to open the file with. If this is zero,
912 * the file is opened with
913 * APR_CREATE | APR_READ | APR_WRITE | APR_EXCL | APR_DELONCLOSE
914 * @param p The pool to allocate the file out of.
916 * This function generates a unique temporary file name from template.
917 * The last six characters of template must be XXXXXX and these are replaced
918 * with a string that makes the filename unique. Since it will be modified,
919 * template must not be a string constant, but should be declared as a character
923 APR_DECLARE(apr_status_t) apr_file_mktemp(apr_file_t **fp, char *templ,
924 apr_int32_t flags, apr_pool_t *p);
928 * Find an existing directory suitable as a temporary storage location.
929 * @param temp_dir The temp directory.
930 * @param p The pool to use for any necessary allocations.
932 * This function uses an algorithm to search for a directory that an
933 * an application can use for temporary storage.
936 APR_DECLARE(apr_status_t) apr_temp_dir_get(const char **temp_dir,
945 #endif /* ! APR_FILE_IO_H */