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diff --git a/include/apr_file_io.h b/include/apr_file_io.h new file mode 100644 index 0000000..af93193 --- /dev/null +++ b/include/apr_file_io.h @@ -0,0 +1,1005 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef APR_FILE_IO_H +#define APR_FILE_IO_H + +/** + * @file apr_file_io.h + * @brief APR File I/O Handling + */ + +#include "apr.h" +#include "apr_pools.h" +#include "apr_time.h" +#include "apr_errno.h" +#include "apr_file_info.h" +#include "apr_inherit.h" + +#define APR_WANT_STDIO /**< for SEEK_* */ +#define APR_WANT_IOVEC /**< for apr_file_writev */ +#include "apr_want.h" + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +/** + * @defgroup apr_file_io File I/O Handling Functions + * @ingroup APR + * @{ + */ + +/** + * @defgroup apr_file_open_flags File Open Flags/Routines + * @{ + */ + +/* Note to implementors: Values in the range 0x00100000--0x80000000 + are reserved for platform-specific values. */ + +#define APR_FOPEN_READ 0x00001 /**< Open the file for reading */ +#define APR_FOPEN_WRITE 0x00002 /**< Open the file for writing */ +#define APR_FOPEN_CREATE 0x00004 /**< Create the file if not there */ +#define APR_FOPEN_APPEND 0x00008 /**< Append to the end of the file */ +#define APR_FOPEN_TRUNCATE 0x00010 /**< Open the file and truncate + to 0 length */ +#define APR_FOPEN_BINARY 0x00020 /**< Open the file in binary mode + (This flag is ignored on UNIX + because it has no meaning)*/ +#define APR_FOPEN_EXCL 0x00040 /**< Open should fail if #APR_FOPEN_CREATE + and file exists. */ +#define APR_FOPEN_BUFFERED 0x00080 /**< Open the file for buffered I/O */ +#define APR_FOPEN_DELONCLOSE 0x00100 /**< Delete the file after close */ +#define APR_FOPEN_XTHREAD 0x00200 /**< Platform dependent tag to open + the file for use across multiple + threads */ +#define APR_FOPEN_SHARELOCK 0x00400 /**< Platform dependent support for + higher level locked read/write + access to support writes across + process/machines */ +#define APR_FOPEN_NOCLEANUP 0x00800 /**< Do not register a cleanup + when the file is opened. The + apr_os_file_t handle in apr_file_t + will not be closed when the pool + is destroyed. */ +#define APR_FOPEN_SENDFILE_ENABLED 0x01000 /**< Advisory flag that this + file should support + apr_socket_sendfile operation */ +#define APR_FOPEN_LARGEFILE 0x04000 /**< Platform dependent flag to enable + * large file support, see WARNING below + */ +#define APR_FOPEN_SPARSE 0x08000 /**< Platform dependent flag to enable + * sparse file support, see WARNING below + */ +#define APR_FOPEN_NONBLOCK 0x40000 /**< Platform dependent flag to enable + * non blocking file io */ + + +/* backcompat */ +#define APR_READ APR_FOPEN_READ /**< @deprecated @see APR_FOPEN_READ */ +#define APR_WRITE APR_FOPEN_WRITE /**< @deprecated @see APR_FOPEN_WRITE */ +#define APR_CREATE APR_FOPEN_CREATE /**< @deprecated @see APR_FOPEN_CREATE */ +#define APR_APPEND APR_FOPEN_APPEND /**< @deprecated @see APR_FOPEN_APPEND */ +#define APR_TRUNCATE APR_FOPEN_TRUNCATE /**< @deprecated @see APR_FOPEN_TRUNCATE */ +#define APR_BINARY APR_FOPEN_BINARY /**< @deprecated @see APR_FOPEN_BINARY */ +#define APR_EXCL APR_FOPEN_EXCL /**< @deprecated @see APR_FOPEN_EXCL */ +#define APR_BUFFERED APR_FOPEN_BUFFERED /**< @deprecated @see APR_FOPEN_BUFFERED */ +#define APR_DELONCLOSE APR_FOPEN_DELONCLOSE /**< @deprecated @see APR_FOPEN_DELONCLOSE */ +#define APR_XTHREAD APR_FOPEN_XTHREAD /**< @deprecated @see APR_FOPEN_XTHREAD */ +#define APR_SHARELOCK APR_FOPEN_SHARELOCK /**< @deprecated @see APR_FOPEN_SHARELOCK */ +#define APR_FILE_NOCLEANUP APR_FOPEN_NOCLEANUP /**< @deprecated @see APR_FOPEN_NOCLEANUP */ +#define APR_SENDFILE_ENABLED APR_FOPEN_SENDFILE_ENABLED /**< @deprecated @see APR_FOPEN_SENDFILE_ENABLED */ +#define APR_LARGEFILE APR_FOPEN_LARGEFILE /**< @deprecated @see APR_FOPEN_LARGEFILE */ + +/** @def APR_FOPEN_LARGEFILE + * @warning APR_FOPEN_LARGEFILE flag only has effect on some + * platforms where sizeof(apr_off_t) == 4. Where implemented, it + * allows opening and writing to a file which exceeds the size which + * can be represented by apr_off_t (2 gigabytes). When a file's size + * does exceed 2Gb, apr_file_info_get() will fail with an error on the + * descriptor, likewise apr_stat()/apr_lstat() will fail on the + * filename. apr_dir_read() will fail with #APR_INCOMPLETE on a + * directory entry for a large file depending on the particular + * APR_FINFO_* flags. Generally, it is not recommended to use this + * flag. + * + * @def APR_FOPEN_SPARSE + * @warning APR_FOPEN_SPARSE may, depending on platform, convert a + * normal file to a sparse file. Some applications may be unable + * to decipher a sparse file, so it's critical that the sparse file + * flag should only be used for files accessed only by APR or other + * applications known to be able to decipher them. APR does not + * guarantee that it will compress the file into sparse segments + * if it was previously created and written without the sparse flag. + * On platforms which do not understand, or on file systems which + * cannot handle sparse files, the flag is ignored by apr_file_open(). + * + * @def APR_FOPEN_NONBLOCK + * @warning APR_FOPEN_NONBLOCK is not implemented on all platforms. + * Callers should be prepared for it to fail with #APR_ENOTIMPL. + */ + +/** @} */ + +/** + * @defgroup apr_file_seek_flags File Seek Flags + * @{ + */ + +/* flags for apr_file_seek */ +/** Set the file position */ +#define APR_SET SEEK_SET +/** Current */ +#define APR_CUR SEEK_CUR +/** Go to end of file */ +#define APR_END SEEK_END +/** @} */ + +/** + * @defgroup apr_file_attrs_set_flags File Attribute Flags + * @{ + */ + +/* flags for apr_file_attrs_set */ +#define APR_FILE_ATTR_READONLY 0x01 /**< File is read-only */ +#define APR_FILE_ATTR_EXECUTABLE 0x02 /**< File is executable */ +#define APR_FILE_ATTR_HIDDEN 0x04 /**< File is hidden */ +/** @} */ + +/** + * @defgroup apr_file_writev{_full} max iovec size + * @{ + */ +#if defined(DOXYGEN) +#define APR_MAX_IOVEC_SIZE 1024 /**< System dependent maximum + size of an iovec array */ +#elif defined(IOV_MAX) +#define APR_MAX_IOVEC_SIZE IOV_MAX +#elif defined(MAX_IOVEC) +#define APR_MAX_IOVEC_SIZE MAX_IOVEC +#else +#define APR_MAX_IOVEC_SIZE 1024 +#endif +/** @} */ + +/** File attributes */ +typedef apr_uint32_t apr_fileattrs_t; + +/** Type to pass as whence argument to apr_file_seek. */ +typedef int apr_seek_where_t; + +/** + * Structure for referencing files. + */ +typedef struct apr_file_t apr_file_t; + +/* File lock types/flags */ +/** + * @defgroup apr_file_lock_types File Lock Types + * @{ + */ + +#define APR_FLOCK_SHARED 1 /**< Shared lock. More than one process + or thread can hold a shared lock + at any given time. Essentially, + this is a "read lock", preventing + writers from establishing an + exclusive lock. */ +#define APR_FLOCK_EXCLUSIVE 2 /**< Exclusive lock. Only one process + may hold an exclusive lock at any + given time. This is analogous to + a "write lock". */ + +#define APR_FLOCK_TYPEMASK 0x000F /**< mask to extract lock type */ +#define APR_FLOCK_NONBLOCK 0x0010 /**< do not block while acquiring the + file lock */ +/** @} */ + +/** + * Open the specified file. + * @param newf The opened file descriptor. + * @param fname The full path to the file (using / on all systems) + * @param flag Or'ed value of: + * @li #APR_FOPEN_READ open for reading + * @li #APR_FOPEN_WRITE open for writing + * @li #APR_FOPEN_CREATE create the file if not there + * @li #APR_FOPEN_APPEND file ptr is set to end prior to all writes + * @li #APR_FOPEN_TRUNCATE set length to zero if file exists + * @li #APR_FOPEN_BINARY not a text file + * @li #APR_FOPEN_BUFFERED buffer the data. Default is non-buffered + * @li #APR_FOPEN_EXCL return error if #APR_FOPEN_CREATE and file exists + * @li #APR_FOPEN_DELONCLOSE delete the file after closing + * @li #APR_FOPEN_XTHREAD Platform dependent tag to open the file + * for use across multiple threads + * @li #APR_FOPEN_SHARELOCK Platform dependent support for higher + * level locked read/write access to support + * writes across process/machines + * @li #APR_FOPEN_NOCLEANUP Do not register a cleanup with the pool + * passed in on the @a pool argument (see below) + * @li #APR_FOPEN_SENDFILE_ENABLED Open with appropriate platform semantics + * for sendfile operations. Advisory only, + * apr_socket_sendfile does not check this flag + * @li #APR_FOPEN_LARGEFILE Platform dependent flag to enable large file + * support, see WARNING below + * @li #APR_FOPEN_SPARSE Platform dependent flag to enable sparse file + * support, see WARNING below + * @li #APR_FOPEN_NONBLOCK Platform dependent flag to enable + * non blocking file io + * @param perm Access permissions for file. + * @param pool The pool to use. + * @remark If perm is #APR_FPROT_OS_DEFAULT and the file is being created, + * appropriate default permissions will be used. + * @remark By default, the returned file descriptor will not be + * inherited by child processes created by apr_proc_create(). This + * can be changed using apr_file_inherit_set(). + */ +APR_DECLARE(apr_status_t) apr_file_open(apr_file_t **newf, const char *fname, + apr_int32_t flag, apr_fileperms_t perm, + apr_pool_t *pool); + +/** + * Close the specified file. + * @param file The file descriptor to close. + */ +APR_DECLARE(apr_status_t) apr_file_close(apr_file_t *file); + +/** + * Delete the specified file. + * @param path The full path to the file (using / on all systems) + * @param pool The pool to use. + * @remark If the file is open, it won't be removed until all + * instances are closed. + */ +APR_DECLARE(apr_status_t) apr_file_remove(const char *path, apr_pool_t *pool); + +/** + * Rename the specified file. + * @param from_path The full path to the original file (using / on all systems) + * @param to_path The full path to the new file (using / on all systems) + * @param pool The pool to use. + * @warning If a file exists at the new location, then it will be + * overwritten. Moving files or directories across devices may not be + * possible. + */ +APR_DECLARE(apr_status_t) apr_file_rename(const char *from_path, + const char *to_path, + apr_pool_t *pool); + +/** + * Create a hard link to the specified file. + * @param from_path The full path to the original file (using / on all systems) + * @param to_path The full path to the new file (using / on all systems) + * @remark Both files must reside on the same device. + */ +APR_DECLARE(apr_status_t) apr_file_link(const char *from_path, + const char *to_path); + +/** + * Copy the specified file to another file. + * @param from_path The full path to the original file (using / on all systems) + * @param to_path The full path to the new file (using / on all systems) + * @param perms Access permissions for the new file if it is created. + * In place of the usual or'd combination of file permissions, the + * value #APR_FPROT_FILE_SOURCE_PERMS may be given, in which case the source + * file's permissions are copied. + * @param pool The pool to use. + * @remark The new file does not need to exist, it will be created if required. + * @warning If the new file already exists, its contents will be overwritten. + */ +APR_DECLARE(apr_status_t) apr_file_copy(const char *from_path, + const char *to_path, + apr_fileperms_t perms, + apr_pool_t *pool); + +/** + * Append the specified file to another file. + * @param from_path The full path to the source file (use / on all systems) + * @param to_path The full path to the destination file (use / on all systems) + * @param perms Access permissions for the destination file if it is created. + * In place of the usual or'd combination of file permissions, the + * value #APR_FPROT_FILE_SOURCE_PERMS may be given, in which case the source + * file's permissions are copied. + * @param pool The pool to use. + * @remark The new file does not need to exist, it will be created if required. + * @remark Note that advanced filesystem permissions such as ACLs are not + * duplicated by this API. The target permissions (including duplicating the + * source file permissions) are assigned only when the target file does not yet + * exist. + */ +APR_DECLARE(apr_status_t) apr_file_append(const char *from_path, + const char *to_path, + apr_fileperms_t perms, + apr_pool_t *pool); + +/** + * Are we at the end of the file + * @param fptr The apr file we are testing. + * @remark Returns #APR_EOF if we are at the end of file, #APR_SUCCESS otherwise. + */ +APR_DECLARE(apr_status_t) apr_file_eof(apr_file_t *fptr); + +/** + * Open standard error as an apr file pointer. + * @param thefile The apr file to use as stderr. + * @param pool The pool to allocate the file out of. + * + * @remark The only reason that the apr_file_open_std* functions exist + * is that you may not always have a stderr/out/in on Windows. This + * is generally a problem with newer versions of Windows and services. + * + * @remark The other problem is that the C library functions generally work + * differently on Windows and Unix. So, by using apr_file_open_std* + * functions, you can get a handle to an APR struct that works with + * the APR functions which are supposed to work identically on all + * platforms. + */ +APR_DECLARE(apr_status_t) apr_file_open_stderr(apr_file_t **thefile, + apr_pool_t *pool); + +/** + * open standard output as an apr file pointer. + * @param thefile The apr file to use as stdout. + * @param pool The pool to allocate the file out of. + * + * @remark See remarks for apr_file_open_stderr(). + */ +APR_DECLARE(apr_status_t) apr_file_open_stdout(apr_file_t **thefile, + apr_pool_t *pool); + +/** + * open standard input as an apr file pointer. + * @param thefile The apr file to use as stdin. + * @param pool The pool to allocate the file out of. + * + * @remark See remarks for apr_file_open_stderr(). + */ +APR_DECLARE(apr_status_t) apr_file_open_stdin(apr_file_t **thefile, + apr_pool_t *pool); + +/** + * open standard error as an apr file pointer, with flags. + * @param thefile The apr file to use as stderr. + * @param flags The flags to open the file with. Only the + * @li #APR_FOPEN_EXCL + * @li #APR_FOPEN_BUFFERED + * @li #APR_FOPEN_XTHREAD + * @li #APR_FOPEN_SHARELOCK + * @li #APR_FOPEN_SENDFILE_ENABLED + * @li #APR_FOPEN_LARGEFILE + * + * flags should be used. The #APR_FOPEN_WRITE flag will + * be set unconditionally. + * @param pool The pool to allocate the file out of. + * + * @remark See remarks for apr_file_open_stderr(). + */ +APR_DECLARE(apr_status_t) apr_file_open_flags_stderr(apr_file_t **thefile, + apr_int32_t flags, + apr_pool_t *pool); + +/** + * open standard output as an apr file pointer, with flags. + * @param thefile The apr file to use as stdout. + * @param flags The flags to open the file with. Only the + * @li #APR_FOPEN_EXCL + * @li #APR_FOPEN_BUFFERED + * @li #APR_FOPEN_XTHREAD + * @li #APR_FOPEN_SHARELOCK + * @li #APR_FOPEN_SENDFILE_ENABLED + * @li #APR_FOPEN_LARGEFILE + * + * flags should be used. The #APR_FOPEN_WRITE flag will + * be set unconditionally. + * @param pool The pool to allocate the file out of. + * + * @remark See remarks for apr_file_open_stderr(). + */ +APR_DECLARE(apr_status_t) apr_file_open_flags_stdout(apr_file_t **thefile, + apr_int32_t flags, + apr_pool_t *pool); + +/** + * open standard input as an apr file pointer, with flags. + * @param thefile The apr file to use as stdin. + * @param flags The flags to open the file with. Only the + * @li #APR_FOPEN_EXCL + * @li #APR_FOPEN_BUFFERED + * @li #APR_FOPEN_XTHREAD + * @li #APR_FOPEN_SHARELOCK + * @li #APR_FOPEN_SENDFILE_ENABLED + * @li #APR_FOPEN_LARGEFILE + * + * flags should be used. The #APR_FOPEN_WRITE flag will + * be set unconditionally. + * @param pool The pool to allocate the file out of. + * + * @remark See remarks for apr_file_open_stderr(). + */ +APR_DECLARE(apr_status_t) apr_file_open_flags_stdin(apr_file_t **thefile, + apr_int32_t flags, + apr_pool_t *pool); + +/** + * Read data from the specified file. + * @param thefile The file descriptor to read from. + * @param buf The buffer to store the data to. + * @param nbytes On entry, the number of bytes to read; on exit, the number + * of bytes read. + * + * @remark apr_file_read() will read up to the specified number of + * bytes, but never more. If there isn't enough data to fill that + * number of bytes, all of the available data is read. The third + * argument is modified to reflect the number of bytes read. If a + * char was put back into the stream via ungetc, it will be the first + * character returned. + * + * @remark It is not possible for both bytes to be read and an #APR_EOF + * or other error to be returned. #APR_EINTR is never returned. + */ +APR_DECLARE(apr_status_t) apr_file_read(apr_file_t *thefile, void *buf, + apr_size_t *nbytes); + +/** + * Write data to the specified file. + * @param thefile The file descriptor to write to. + * @param buf The buffer which contains the data. + * @param nbytes On entry, the number of bytes to write; on exit, the number + * of bytes written. + * + * @remark apr_file_write() will write up to the specified number of + * bytes, but never more. If the OS cannot write that many bytes, it + * will write as many as it can. The third argument is modified to + * reflect the * number of bytes written. + * + * @remark It is possible for both bytes to be written and an error to + * be returned. #APR_EINTR is never returned. + */ +APR_DECLARE(apr_status_t) apr_file_write(apr_file_t *thefile, const void *buf, + apr_size_t *nbytes); + +/** + * Write data from iovec array to the specified file. + * @param thefile The file descriptor to write to. + * @param vec The array from which to get the data to write to the file. + * @param nvec The number of elements in the struct iovec array. This must + * be smaller than #APR_MAX_IOVEC_SIZE. If it isn't, the function + * will fail with #APR_EINVAL. + * @param nbytes The number of bytes written. + * + * @remark It is possible for both bytes to be written and an error to + * be returned. #APR_EINTR is never returned. + * + * @remark apr_file_writev() is available even if the underlying + * operating system doesn't provide writev(). + */ +APR_DECLARE(apr_status_t) apr_file_writev(apr_file_t *thefile, + const struct iovec *vec, + apr_size_t nvec, apr_size_t *nbytes); + +/** + * Read data from the specified file, ensuring that the buffer is filled + * before returning. + * @param thefile The file descriptor to read from. + * @param buf The buffer to store the data to. + * @param nbytes The number of bytes to read. + * @param bytes_read If non-NULL, this will contain the number of bytes read. + * + * @remark apr_file_read_full() will read up to the specified number of + * bytes, but never more. If there isn't enough data to fill that + * number of bytes, then the process/thread will block until it is + * available or EOF is reached. If a char was put back into the + * stream via ungetc, it will be the first character returned. + * + * @remark It is possible for both bytes to be read and an error to be + * returned. And if *bytes_read is less than nbytes, an accompanying + * error is _always_ returned. + * + * @remark #APR_EINTR is never returned. + */ +APR_DECLARE(apr_status_t) apr_file_read_full(apr_file_t *thefile, void *buf, + apr_size_t nbytes, + apr_size_t *bytes_read); + +/** + * Write data to the specified file, ensuring that all of the data is + * written before returning. + * @param thefile The file descriptor to write to. + * @param buf The buffer which contains the data. + * @param nbytes The number of bytes to write. + * @param bytes_written If non-NULL, set to the number of bytes written. + * + * @remark apr_file_write_full() will write up to the specified number of + * bytes, but never more. If the OS cannot write that many bytes, the + * process/thread will block until they can be written. Exceptional + * error such as "out of space" or "pipe closed" will terminate with + * an error. + * + * @remark It is possible for both bytes to be written and an error to + * be returned. And if *bytes_written is less than nbytes, an + * accompanying error is _always_ returned. + * + * @remark #APR_EINTR is never returned. + */ +APR_DECLARE(apr_status_t) apr_file_write_full(apr_file_t *thefile, + const void *buf, + apr_size_t nbytes, + apr_size_t *bytes_written); + + +/** + * Write data from iovec array to the specified file, ensuring that all of the + * data is written before returning. + * @param thefile The file descriptor to write to. + * @param vec The array from which to get the data to write to the file. + * @param nvec The number of elements in the struct iovec array. This must + * be smaller than #APR_MAX_IOVEC_SIZE. If it isn't, the function + * will fail with #APR_EINVAL. + * @param nbytes The number of bytes written. + * + * @remark apr_file_writev_full() is available even if the underlying + * operating system doesn't provide writev(). + */ +APR_DECLARE(apr_status_t) apr_file_writev_full(apr_file_t *thefile, + const struct iovec *vec, + apr_size_t nvec, + apr_size_t *nbytes); +/** + * Write a character into the specified file. + * @param ch The character to write. + * @param thefile The file descriptor to write to + */ +APR_DECLARE(apr_status_t) apr_file_putc(char ch, apr_file_t *thefile); + +/** + * Read a character from the specified file. + * @param ch The character to read into + * @param thefile The file descriptor to read from + */ +APR_DECLARE(apr_status_t) apr_file_getc(char *ch, apr_file_t *thefile); + +/** + * Put a character back onto a specified stream. + * @param ch The character to write. + * @param thefile The file descriptor to write to + */ +APR_DECLARE(apr_status_t) apr_file_ungetc(char ch, apr_file_t *thefile); + +/** + * Read a line from the specified file + * @param str The buffer to store the string in. + * @param len The length of the string + * @param thefile The file descriptor to read from + * @remark The buffer will be NUL-terminated if any characters are stored. + * The newline at the end of the line will not be stripped. + */ +APR_DECLARE(apr_status_t) apr_file_gets(char *str, int len, + apr_file_t *thefile); + +/** + * Write the string into the specified file. + * @param str The string to write. + * @param thefile The file descriptor to write to + */ +APR_DECLARE(apr_status_t) apr_file_puts(const char *str, apr_file_t *thefile); + +/** + * Flush the file's buffer. + * @param thefile The file descriptor to flush + */ +APR_DECLARE(apr_status_t) apr_file_flush(apr_file_t *thefile); + +/** + * Transfer all file modified data and metadata to disk. + * @param thefile The file descriptor to sync + */ +APR_DECLARE(apr_status_t) apr_file_sync(apr_file_t *thefile); + +/** + * Transfer all file modified data to disk. + * @param thefile The file descriptor to sync + */ +APR_DECLARE(apr_status_t) apr_file_datasync(apr_file_t *thefile); + +/** + * Duplicate the specified file descriptor. + * @param new_file The structure to duplicate into. + * @param old_file The file to duplicate. + * @param p The pool to use for the new file. + * @remark *new_file must point to a valid apr_file_t, or point to NULL. + */ +APR_DECLARE(apr_status_t) apr_file_dup(apr_file_t **new_file, + apr_file_t *old_file, + apr_pool_t *p); + +/** + * Duplicate the specified file descriptor and close the original + * @param new_file The old file that is to be closed and reused + * @param old_file The file to duplicate + * @param p The pool to use for the new file + * + * @remark new_file MUST point at a valid apr_file_t. It cannot be NULL. + */ +APR_DECLARE(apr_status_t) apr_file_dup2(apr_file_t *new_file, + apr_file_t *old_file, + apr_pool_t *p); + +/** + * Move the specified file descriptor to a new pool + * @param new_file Pointer in which to return the new apr_file_t + * @param old_file The file to move + * @param p The pool to which the descriptor is to be moved + * @remark Unlike apr_file_dup2(), this function doesn't do an + * OS dup() operation on the underlying descriptor; it just + * moves the descriptor's apr_file_t wrapper to a new pool. + * @remark The new pool need not be an ancestor of old_file's pool. + * @remark After calling this function, old_file may not be used + */ +APR_DECLARE(apr_status_t) apr_file_setaside(apr_file_t **new_file, + apr_file_t *old_file, + apr_pool_t *p); + +/** + * Give the specified apr file handle a new buffer + * @param thefile The file handle that is to be modified + * @param buffer The buffer + * @param bufsize The size of the buffer + * @remark It is possible to add a buffer to previously unbuffered + * file handles, the #APR_FOPEN_BUFFERED flag will be added to + * the file handle's flags. Likewise, with buffer=NULL and + * bufsize=0 arguments it is possible to make a previously + * buffered file handle unbuffered. + */ +APR_DECLARE(apr_status_t) apr_file_buffer_set(apr_file_t *thefile, + char * buffer, + apr_size_t bufsize); + +/** + * Get the size of any buffer for the specified apr file handle + * @param thefile The file handle + */ +APR_DECLARE(apr_size_t) apr_file_buffer_size_get(apr_file_t *thefile); + +/** + * Move the read/write file offset to a specified byte within a file. + * @param thefile The file descriptor + * @param where How to move the pointer, one of: + * @li #APR_SET -- set the offset to offset + * @li #APR_CUR -- add the offset to the current position + * @li #APR_END -- add the offset to the current file size + * @param offset The offset to move the pointer to. + * @remark The third argument is modified to be the offset the pointer + was actually moved to. + */ +APR_DECLARE(apr_status_t) apr_file_seek(apr_file_t *thefile, + apr_seek_where_t where, + apr_off_t *offset); + +/** + * Create an anonymous pipe. + * @param in The newly created pipe's file for reading. + * @param out The newly created pipe's file for writing. + * @param pool The pool to operate on. + * @remark By default, the returned file descriptors will be inherited + * by child processes created using apr_proc_create(). This can be + * changed using apr_file_inherit_unset(). + * @bug Some platforms cannot toggle between blocking and nonblocking, + * and when passing a pipe as a standard handle to an application which + * does not expect it, a non-blocking stream will fluxor the client app. + * @deprecated @see apr_file_pipe_create_pools() + */ +APR_DECLARE(apr_status_t) apr_file_pipe_create(apr_file_t **in, + apr_file_t **out, + apr_pool_t *pool); + +/** + * Create an anonymous pipe which portably supports async timeout options. + * @param in The newly created pipe's file for reading. + * @param out The newly created pipe's file for writing. + * @param blocking one of these values defined in apr_thread_proc.h; + * @li #APR_FULL_BLOCK + * @li #APR_READ_BLOCK + * @li #APR_WRITE_BLOCK + * @li #APR_FULL_NONBLOCK + * @param pool The pool to operate on. + * @remark By default, the returned file descriptors will be inherited + * by child processes created using apr_proc_create(). This can be + * changed using apr_file_inherit_unset(). + * @remark Some platforms cannot toggle between blocking and nonblocking, + * and when passing a pipe as a standard handle to an application which + * does not expect it, a non-blocking stream will fluxor the client app. + * Use this function rather than apr_file_pipe_create() to create pipes + * where one or both ends require non-blocking semantics. + * @deprecated @see apr_file_pipe_create_pools() + */ +APR_DECLARE(apr_status_t) apr_file_pipe_create_ex(apr_file_t **in, + apr_file_t **out, + apr_int32_t blocking, + apr_pool_t *pool); + +/** + * Create an anonymous pipe which portably supports async timeout options, + * placing each side of the pipe in a different pool. + * @param in The newly created pipe's file for reading. + * @param out The newly created pipe's file for writing. + * @param blocking one of these values defined in apr_thread_proc.h; + * @li #APR_FULL_BLOCK + * @li #APR_READ_BLOCK + * @li #APR_WRITE_BLOCK + * @li #APR_FULL_NONBLOCK + * @param pool_in The pool for the reading pipe. + * @param pool_out The pool for the writing pipe. + * @remark By default, the returned file descriptors will be inherited + * by child processes created using apr_proc_create(). This can be + * changed using apr_file_inherit_unset(). + * @remark Some platforms cannot toggle between blocking and nonblocking, + * and when passing a pipe as a standard handle to an application which + * does not expect it, a non-blocking stream will fluxor the client app. + * Use this function rather than apr_file_pipe_create() to create pipes + * where one or both ends require non-blocking semantics. + */ +APR_DECLARE(apr_status_t) apr_file_pipe_create_pools(apr_file_t **in, + apr_file_t **out, + apr_int32_t blocking, + apr_pool_t *pool_in, + apr_pool_t *pool_out); + +/** + * Create a named pipe. + * @param filename The filename of the named pipe + * @param perm The permissions for the newly created pipe. + * @param pool The pool to operate on. + */ +APR_DECLARE(apr_status_t) apr_file_namedpipe_create(const char *filename, + apr_fileperms_t perm, + apr_pool_t *pool); + +/** + * Get the timeout value for a pipe or manipulate the blocking state. + * @param thepipe The pipe we are getting a timeout for. + * @param timeout The current timeout value in microseconds. + */ +APR_DECLARE(apr_status_t) apr_file_pipe_timeout_get(apr_file_t *thepipe, + apr_interval_time_t *timeout); + +/** + * Set the timeout value for a pipe or manipulate the blocking state. + * @param thepipe The pipe we are setting a timeout on. + * @param timeout The timeout value in microseconds. Values < 0 mean wait + * forever, 0 means do not wait at all. + */ +APR_DECLARE(apr_status_t) apr_file_pipe_timeout_set(apr_file_t *thepipe, + apr_interval_time_t timeout); + +/** file (un)locking functions. */ + +/** + * Establish a lock on the specified, open file. The lock may be advisory + * or mandatory, at the discretion of the platform. The lock applies to + * the file as a whole, rather than a specific range. Locks are established + * on a per-thread/process basis; a second lock by the same thread will not + * block. + * @param thefile The file to lock. + * @param type The type of lock to establish on the file. + */ +APR_DECLARE(apr_status_t) apr_file_lock(apr_file_t *thefile, int type); + +/** + * Remove any outstanding locks on the file. + * @param thefile The file to unlock. + */ +APR_DECLARE(apr_status_t) apr_file_unlock(apr_file_t *thefile); + +/**accessor and general file_io functions. */ + +/** + * return the file name of the current file. + * @param new_path The path of the file. + * @param thefile The currently open file. + */ +APR_DECLARE(apr_status_t) apr_file_name_get(const char **new_path, + apr_file_t *thefile); + +/** + * Return the data associated with the current file. + * @param data The user data associated with the file. + * @param key The key to use for retrieving data associated with this file. + * @param file The currently open file. + */ +APR_DECLARE(apr_status_t) apr_file_data_get(void **data, const char *key, + apr_file_t *file); + +/** + * Set the data associated with the current file. + * @param file The currently open file. + * @param data The user data to associate with the file. + * @param key The key to use for associating data with the file. + * @param cleanup The cleanup routine to use when the file is destroyed. + */ +APR_DECLARE(apr_status_t) apr_file_data_set(apr_file_t *file, void *data, + const char *key, + apr_status_t (*cleanup)(void *)); + +/** + * Write a string to a file using a printf format. + * @param fptr The file to write to. + * @param format The format string + * @param ... The values to substitute in the format string + * @return The number of bytes written + */ +APR_DECLARE_NONSTD(int) apr_file_printf(apr_file_t *fptr, + const char *format, ...) + __attribute__((format(printf,2,3))); + +/** + * set the specified file's permission bits. + * @param fname The file (name) to apply the permissions to. + * @param perms The permission bits to apply to the file. + * + * @warning Some platforms may not be able to apply all of the + * available permission bits; #APR_INCOMPLETE will be returned if some + * permissions are specified which could not be set. + * + * @warning Platforms which do not implement this feature will return + * #APR_ENOTIMPL. + */ +APR_DECLARE(apr_status_t) apr_file_perms_set(const char *fname, + apr_fileperms_t perms); + +/** + * Set attributes of the specified file. + * @param fname The full path to the file (using / on all systems) + * @param attributes Or'd combination of + * @li #APR_FILE_ATTR_READONLY - make the file readonly + * @li #APR_FILE_ATTR_EXECUTABLE - make the file executable + * @li #APR_FILE_ATTR_HIDDEN - make the file hidden + * @param attr_mask Mask of valid bits in attributes. + * @param pool the pool to use. + * @remark This function should be used in preference to explicit manipulation + * of the file permissions, because the operations to provide these + * attributes are platform specific and may involve more than simply + * setting permission bits. + * @warning Platforms which do not implement this feature will return + * #APR_ENOTIMPL. + */ +APR_DECLARE(apr_status_t) apr_file_attrs_set(const char *fname, + apr_fileattrs_t attributes, + apr_fileattrs_t attr_mask, + apr_pool_t *pool); + +/** + * Set the mtime of the specified file. + * @param fname The full path to the file (using / on all systems) + * @param mtime The mtime to apply to the file. + * @param pool The pool to use. + * @warning Platforms which do not implement this feature will return + * #APR_ENOTIMPL. + */ +APR_DECLARE(apr_status_t) apr_file_mtime_set(const char *fname, + apr_time_t mtime, + apr_pool_t *pool); + +/** + * Create a new directory on the file system. + * @param path the path for the directory to be created. (use / on all systems) + * @param perm Permissions for the new directory. + * @param pool the pool to use. + */ +APR_DECLARE(apr_status_t) apr_dir_make(const char *path, apr_fileperms_t perm, + apr_pool_t *pool); + +/** Creates a new directory on the file system, but behaves like + * 'mkdir -p'. Creates intermediate directories as required. No error + * will be reported if PATH already exists. + * @param path the path for the directory to be created. (use / on all systems) + * @param perm Permissions for the new directory. + * @param pool the pool to use. + */ +APR_DECLARE(apr_status_t) apr_dir_make_recursive(const char *path, + apr_fileperms_t perm, + apr_pool_t *pool); + +/** + * Remove directory from the file system. + * @param path the path for the directory to be removed. (use / on all systems) + * @param pool the pool to use. + * @remark Removing a directory which is in-use (e.g., the current working + * directory, or during apr_dir_read, or with an open file) is not portable. + */ +APR_DECLARE(apr_status_t) apr_dir_remove(const char *path, apr_pool_t *pool); + +/** + * get the specified file's stats. + * @param finfo Where to store the information about the file. + * @param wanted The desired apr_finfo_t fields, as a bit flag of APR_FINFO_* values + * @param thefile The file to get information about. + */ +APR_DECLARE(apr_status_t) apr_file_info_get(apr_finfo_t *finfo, + apr_int32_t wanted, + apr_file_t *thefile); + + +/** + * Truncate the file's length to the specified offset + * @param fp The file to truncate + * @param offset The offset to truncate to. + * @remark The read/write file offset is repositioned to offset. + */ +APR_DECLARE(apr_status_t) apr_file_trunc(apr_file_t *fp, apr_off_t offset); + +/** + * Retrieve the flags that were passed into apr_file_open() + * when the file was opened. + * @return apr_int32_t the flags + */ +APR_DECLARE(apr_int32_t) apr_file_flags_get(apr_file_t *f); + +/** + * Get the pool used by the file. + */ +APR_POOL_DECLARE_ACCESSOR(file); + +/** + * Set a file to be inherited by child processes. + * + */ +APR_DECLARE_INHERIT_SET(file); + +/** + * Unset a file from being inherited by child processes. + */ +APR_DECLARE_INHERIT_UNSET(file); + +/** + * Open a temporary file + * @param fp The apr file to use as a temporary file. + * @param templ The template to use when creating a temp file. + * @param flags The flags to open the file with. If this is zero, + * the file is opened with + * #APR_FOPEN_CREATE | #APR_FOPEN_READ | #APR_FOPEN_WRITE | + * #APR_FOPEN_EXCL | #APR_FOPEN_DELONCLOSE + * @param p The pool to allocate the file out of. + * @remark + * This function generates a unique temporary file name from template. + * The last six characters of template must be XXXXXX and these are replaced + * with a string that makes the filename unique. Since it will be modified, + * template must not be a string constant, but should be declared as a character + * array. + * + */ +APR_DECLARE(apr_status_t) apr_file_mktemp(apr_file_t **fp, char *templ, + apr_int32_t flags, apr_pool_t *p); + + +/** + * Find an existing directory suitable as a temporary storage location. + * @param temp_dir The temp directory. + * @param p The pool to use for any necessary allocations. + * @remark + * This function uses an algorithm to search for a directory that an + * an application can use for temporary storage. + * + */ +APR_DECLARE(apr_status_t) apr_temp_dir_get(const char **temp_dir, + apr_pool_t *p); + +/** @} */ + +#ifdef __cplusplus +} +#endif + +#endif /* ! APR_FILE_IO_H */ |