#ifndef GNUNET_DISK_LIB_H
#define GNUNET_DISK_LIB_H
+#if WINDOWS
+#define OFF_T uint64_t
+#else
+#define OFF_T off_t
+#endif
+
/**
* Opaque handle used to access files.
*/
{
/**
- * Open the file for reading
+ * Open the file for reading
*/
GNUNET_DISK_OPEN_READ = 1,
/**
- * Open the file for writing
+ * Open the file for writing
*/
GNUNET_DISK_OPEN_WRITE = 2,
/**
- * Open the file for both reading and writing
+ * Open the file for both reading and writing
*/
GNUNET_DISK_OPEN_READWRITE = 3,
/**
- * Fail if file already exists
+ * Fail if file already exists
*/
GNUNET_DISK_OPEN_FAILIFEXISTS = 4,
/**
- * Truncate file if it exists
+ * Truncate file if it exists
*/
GNUNET_DISK_OPEN_TRUNCATE = 8,
/**
- * Create file if it doesn't exist
+ * Create file if it doesn't exist
*/
GNUNET_DISK_OPEN_CREATE = 16,
/**
- * Append to the file
+ * Append to the file
*/
GNUNET_DISK_OPEN_APPEND = 32
};
* @param part a file on the partition to check
* @return -1 on errors, otherwise the number of free blocks
*/
-long GNUNET_DISK_get_blocks_available (const char *part);
+long
+GNUNET_DISK_get_blocks_available (const char *part);
/**
* @param h handle to check
* @return GNUNET_YES if invalid, GNUNET_NO if valid
*/
-int GNUNET_DISK_handle_invalid (const struct GNUNET_DISK_FileHandle *h);
+int
+GNUNET_DISK_handle_invalid (const struct GNUNET_DISK_FileHandle *h);
/**
* @return GNUNET_YES if yes, GNUNET_NO if not a file, GNUNET_SYSERR if something
* else (will print an error message in that case, too).
*/
-int GNUNET_DISK_file_test (const char *fil);
+int
+GNUNET_DISK_file_test (const char *fil);
/**
* @param whence specification to which position the offset parameter relates to
* @return the new position on success, GNUNET_SYSERR otherwise
*/
-off_t
-GNUNET_DISK_file_seek (const struct GNUNET_DISK_FileHandle *h,
- off_t offset, enum GNUNET_DISK_Seek whence);
+OFF_T
+GNUNET_DISK_file_seek (const struct GNUNET_DISK_FileHandle *h, OFF_T offset,
+ enum GNUNET_DISK_Seek whence);
/**
* included?
* @return GNUNET_OK on success, GNUNET_SYSERR on error
*/
-int GNUNET_DISK_file_size (const char *filename,
- uint64_t * size, int includeSymLinks);
+int
+GNUNET_DISK_file_size (const char *filename, uint64_t * size,
+ int includeSymLinks);
/**
* @param ino set to the inode ID
* @return GNUNET_OK on success
*/
-int GNUNET_DISK_file_get_identifiers (const char *filename,
- uint64_t * dev, uint64_t * ino);
+int
+GNUNET_DISK_file_get_identifiers (const char *filename, uint64_t * dev,
+ uint64_t * ino);
/**
* an absolute path, the current 'TMPDIR' will be prepended. In any case,
* 6 random characters will be appended to the name to create a unique
* filename.
- *
+ *
* @param t component to use for the name;
* does NOT contain "XXXXXX" or "/tmp/".
* @return NULL on error, otherwise name of fresh
* file on disk in directory for temporary files
*/
-char *GNUNET_DISK_mktemp (const char *t);
+char *
+GNUNET_DISK_mktemp (const char *t);
/**
* call (because of flags)
* @return IO handle on success, NULL on error
*/
-struct GNUNET_DISK_FileHandle *GNUNET_DISK_file_open (const char *fn,
- enum GNUNET_DISK_OpenFlags
- flags,
- enum
- GNUNET_DISK_AccessPermissions
- perm);
+struct GNUNET_DISK_FileHandle *
+GNUNET_DISK_file_open (const char *fn, enum GNUNET_DISK_OpenFlags flags,
+ enum GNUNET_DISK_AccessPermissions perm);
+
+
+/**
+ * Get the size of an open file.
+ *
+ * @param fh open file handle
+ * @param size where to write size of the file
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+int
+GNUNET_DISK_file_handle_size (struct GNUNET_DISK_FileHandle *fh,
+ OFF_T *size);
+
/**
* Creates an interprocess channel
* @param inherit_write 1 to make write handle inheritable, 0 otherwise (NT only)
* @return handle to the new pipe, NULL on error
*/
-struct GNUNET_DISK_PipeHandle *GNUNET_DISK_pipe (int blocking,
- int inherit_read,
- int inherit_write);
+struct GNUNET_DISK_PipeHandle *
+GNUNET_DISK_pipe (int blocking_read, int blocking_write, int inherit_read, int inherit_write);
+/**
+ * Creates a pipe object from a couple of file descriptors.
+ * Useful for wrapping existing pipe FDs.
+ *
+ * @param blocking creates an asynchronous pipe if set to GNUNET_NO
+ * @param fd an array of two fd values. One of them may be -1 for read-only or write-only pipes
+ *
+ * @return handle to the new pipe, NULL on error
+ */
+struct GNUNET_DISK_PipeHandle *
+GNUNET_DISK_pipe_from_fd (int blocking_read, int blocking_write, int fd[2]);
+
/**
* Closes an interprocess channel
* @param p pipe
* @return GNUNET_OK on success, GNUNET_SYSERR otherwise
*/
-int GNUNET_DISK_pipe_close (struct GNUNET_DISK_PipeHandle *p);
+int
+GNUNET_DISK_pipe_close (struct GNUNET_DISK_PipeHandle *p);
/**
* Closes one half of an interprocess channel
* @param h file handle
* @return GNUNET_OK on success, GNUNET_SYSERR otherwise
*/
-int GNUNET_DISK_file_close (struct GNUNET_DISK_FileHandle *h);
+int
+GNUNET_DISK_file_close (struct GNUNET_DISK_FileHandle *h);
/**
* @param n end to access
* @return handle for the respective end
*/
-const struct GNUNET_DISK_FileHandle *GNUNET_DISK_pipe_handle (const struct
- GNUNET_DISK_PipeHandle
- *p,
- enum
- GNUNET_DISK_PipeEnd
- n);
+const struct GNUNET_DISK_FileHandle *
+GNUNET_DISK_pipe_handle (const struct GNUNET_DISK_PipeHandle *p,
+ enum GNUNET_DISK_PipeEnd n);
/**
* Read the contents of a binary file into a buffer.
* @param len the maximum number of bytes to read
* @return the number of bytes read on success, GNUNET_SYSERR on failure
*/
-ssize_t GNUNET_DISK_file_read (const struct GNUNET_DISK_FileHandle *h,
- void *result, size_t len);
+ssize_t
+GNUNET_DISK_file_read (const struct GNUNET_DISK_FileHandle *h, void *result,
+ size_t len);
+/**
+ * Read the contents of a binary file into a buffer.
+ * Guarantees not to block (returns GNUNET_SYSERR and sets errno to EAGAIN
+ * when no data can be read).
+ *
+ * @param h handle to an open file
+ * @param result the buffer to write the result to
+ * @param len the maximum number of bytes to read
+ * @return the number of bytes read on success, GNUNET_SYSERR on failure
+ */
+ssize_t
+GNUNET_DISK_file_read_non_blocking (const struct GNUNET_DISK_FileHandle * h,
+ void *result, size_t len);
/**
* Read the contents of a binary file into a buffer.
* @param len the maximum number of bytes to read
* @return number of bytes read, GNUNET_SYSERR on failure
*/
-ssize_t GNUNET_DISK_fn_read (const char *fn, void *result, size_t len);
+ssize_t
+GNUNET_DISK_fn_read (const char *fn, void *result, size_t len);
/**
* @param n number of bytes to write
* @return number of bytes written on success, GNUNET_SYSERR on error
*/
-ssize_t GNUNET_DISK_file_write (const struct GNUNET_DISK_FileHandle *h,
- const void *buffer, size_t n);
+ssize_t
+GNUNET_DISK_file_write (const struct GNUNET_DISK_FileHandle *h,
+ const void *buffer, size_t n);
+/**
+ * Write a buffer to a file, blocking, if necessary.
+ * @param h handle to open file
+ * @param buffer the data to write
+ * @param n number of bytes to write
+ * @return number of bytes written on success, GNUNET_SYSERR on error
+ */
+ssize_t
+GNUNET_DISK_file_write_blocking (const struct GNUNET_DISK_FileHandle * h,
+ const void *buffer, size_t n);
+
/**
* Write a buffer to a file. If the file is longer than
* the given buffer size, it will be truncated.
* @param fn file name
* @param buffer the data to write
* @param n number of bytes to write
- * @param mode file permissions
+ * @param mode file permissions
* @return number of bytes written on success, GNUNET_SYSERR on error
*/
-ssize_t GNUNET_DISK_fn_write (const char *fn,
- const void *buffer,
- size_t n,
- enum GNUNET_DISK_AccessPermissions mode);
+ssize_t
+GNUNET_DISK_fn_write (const char *fn, const void *buffer, size_t n,
+ enum GNUNET_DISK_AccessPermissions mode);
/**
* @param dst destination file name
* @return GNUNET_OK on success, GNUNET_SYSERR on error
*/
-int GNUNET_DISK_file_copy (const char *src, const char *dst);
+int
+GNUNET_DISK_file_copy (const char *src, const char *dst);
/**
* @param callback_cls closure for callback
* @return the number of files found, -1 on error
*/
-int GNUNET_DISK_directory_scan (const char *dirName,
- GNUNET_FileNameCallback callback,
- void *callback_cls);
+int
+GNUNET_DISK_directory_scan (const char *dirName,
+ GNUNET_FileNameCallback callback,
+ void *callback_cls);
/**
* GNUNET_NO if this was the last entry (and iteration is complete),
* GNUNET_SYSERR if "can" was YES
*/
-int GNUNET_DISK_directory_iterator_next (struct GNUNET_DISK_DirectoryIterator
- *iter, int can);
+int
+GNUNET_DISK_directory_iterator_next (struct GNUNET_DISK_DirectoryIterator *iter,
+ int can);
/**
* @param dirName the name of the directory
* @param callback the method to call for each file
* @param callback_cls closure for callback
+ * @return GNUNET_YES if directory is not empty and @callback
+ * will be called later, GNUNET_NO otherwise, GNUNET_SYSERR on error.
*/
-void GNUNET_DISK_directory_iterator_start (enum GNUNET_SCHEDULER_Priority
- prio, const char *dirName,
- GNUNET_DISK_DirectoryIteratorCallback
- callback, void *callback_cls);
+int
+GNUNET_DISK_directory_iterator_start (enum GNUNET_SCHEDULER_Priority prio,
+ const char *dirName,
+ GNUNET_DISK_DirectoryIteratorCallback
+ callback, void *callback_cls);
/**
* @returns GNUNET_OK on success, GNUNET_SYSERR on failure,
* GNUNET_NO if directory exists but is not writeable
*/
-int GNUNET_DISK_directory_create_for_file (const char *filename);
+int
+GNUNET_DISK_directory_create_for_file (const char *filename);
/**
* @return GNUNET_YES if yes, GNUNET_NO if does not exist, GNUNET_SYSERR
* on any error and if exists but not directory
*/
-int GNUNET_DISK_directory_test (const char *fil);
+int
+GNUNET_DISK_directory_test (const char *fil);
/**
* @param fileName the file to remove
* @return GNUNET_OK on success, GNUNET_SYSERR on error
*/
-int GNUNET_DISK_directory_remove (const char *fileName);
+int
+GNUNET_DISK_directory_remove (const char *fileName);
/**
* @param dir the directory to create
* @returns GNUNET_SYSERR on failure, GNUNET_OK otherwise
*/
-int GNUNET_DISK_directory_create (const char *dir);
+int
+GNUNET_DISK_directory_create (const char *dir);
/**
* @return GNUNET_OK on success, GNUNET_SYSERR on error
*/
int
-GNUNET_DISK_file_lock (struct GNUNET_DISK_FileHandle *fh, off_t lockStart,
- off_t lockEnd, int excl);
+GNUNET_DISK_file_lock (struct GNUNET_DISK_FileHandle *fh, OFF_T lockStart,
+ OFF_T lockEnd, int excl);
/**
* @return GNUNET_OK on success, GNUNET_SYSERR on error
*/
int
-GNUNET_DISK_file_unlock (struct GNUNET_DISK_FileHandle *fh,
- off_t unlockStart, off_t unlockEnd);
+GNUNET_DISK_file_unlock (struct GNUNET_DISK_FileHandle *fh, OFF_T unlockStart,
+ OFF_T unlockEnd);
/**
* @brief Removes special characters as ':' from a filename.
* @param fn the filename to canonicalize
*/
-void GNUNET_DISK_filename_canonicalize (char *fn);
+void
+GNUNET_DISK_filename_canonicalize (char *fn);
/**
* @param user new owner of the file
* @return GNUNET_OK on success, GNUNET_SYSERR on failure
*/
-int GNUNET_DISK_file_change_owner (const char *filename, const char *user);
+int
+GNUNET_DISK_file_change_owner (const char *filename, const char *user);
/**
* private directory name.
* @return the constructed filename
*/
-char *GNUNET_DISK_get_home_filename (const struct GNUNET_CONFIGURATION_Handle
- *cfg, const char *serviceName, ...);
+char *
+GNUNET_DISK_get_home_filename (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const char *serviceName, ...);
/**
* @param len size of the mapping
* @return pointer to the mapped memory region, NULL on failure
*/
-void *GNUNET_DISK_file_map (const struct GNUNET_DISK_FileHandle *h,
- struct GNUNET_DISK_MapHandle **m,
- enum GNUNET_DISK_MapType access, size_t len);
+void *
+GNUNET_DISK_file_map (const struct GNUNET_DISK_FileHandle *h,
+ struct GNUNET_DISK_MapHandle **m,
+ enum GNUNET_DISK_MapType access, size_t len);
/**
* Unmap a file
* @param h mapping handle
* @return GNUNET_OK on success, GNUNET_SYSERR otherwise
*/
-int GNUNET_DISK_file_unmap (struct GNUNET_DISK_MapHandle *h);
+int
+GNUNET_DISK_file_unmap (struct GNUNET_DISK_MapHandle *h);
/**
* Write file changes to disk
* @param h handle to an open file
* @return GNUNET_OK on success, GNUNET_SYSERR otherwise
*/
-int GNUNET_DISK_file_sync (const struct GNUNET_DISK_FileHandle *h);
+int
+GNUNET_DISK_file_sync (const struct GNUNET_DISK_FileHandle *h);
/**
* Creates a named pipe/FIFO and opens it
* @param perm access permissions
* @return pipe handle on success, NULL on error
*/
-struct GNUNET_DISK_FileHandle *GNUNET_DISK_npipe_create (char **fn,
- enum
- GNUNET_DISK_OpenFlags
- flags,
- enum
- GNUNET_DISK_AccessPermissions
- perm);
+struct GNUNET_DISK_FileHandle *
+GNUNET_DISK_npipe_create (char **fn, enum GNUNET_DISK_OpenFlags flags,
+ enum GNUNET_DISK_AccessPermissions perm);
/**
* Opens already existing named pipe/FIFO
* @param perm access permissions
* @return pipe handle on success, NULL on error
*/
-struct GNUNET_DISK_FileHandle *GNUNET_DISK_npipe_open (const char *fn,
- enum
- GNUNET_DISK_OpenFlags
- flags,
- enum
- GNUNET_DISK_AccessPermissions
- perm);
+struct GNUNET_DISK_FileHandle *
+GNUNET_DISK_npipe_open (const char *fn, enum GNUNET_DISK_OpenFlags flags,
+ enum GNUNET_DISK_AccessPermissions perm);
/**
* Closes a named pipe/FIFO
* @param pipe named pipe
* @return GNUNET_OK on success, GNUNET_SYSERR otherwise
*/
-int GNUNET_DISK_npipe_close (struct GNUNET_DISK_FileHandle *pipe);
+int
+GNUNET_DISK_npipe_close (struct GNUNET_DISK_FileHandle *pipe);
#if 0 /* keep Emacsens' auto-indent happy */
{
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