Edit File: apr_file_io.h
/* 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. */ 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_ex() */ 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. */ 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 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 */
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