FSTruncateFile

Syntax

#include <cafe/fs.h>

FSStatus FSTruncateFile(
                FSClient                        *client,
                FSCmdBlock                      *block,
                FSFileHandle                    fileHandle,
                FSRetFlag                       errHandling
                );
FSStatus FSTruncateFileAsync(
                FSClient                        *client,
                FSCmdBlock                      *block,
                FSFileHandle                    fileHandle,
                FSRetFlag                       errHandling,
                const FSAsyncParams             *asyncParams
                );

Parameters

client Pointer to the client buffer.
block Command block.
fileHandle Handle of the file.
errHandling Auto error handling flag. Only indicated errors are returned.
asyncParams (Async API only) Notification parameters for an asynchronous call.

Return Values

Sync API : Return values / Async API: Callback return values

FS_STATUS_OK Successfully completed.
FS_STATUS_CANCELED The command was canceled.
FS_STATUS_ACCESS_ERROR Access mode is invalid (e.g. Opened file is not writable mode).
FS_STATUS_UNSUPPORTED_CMD Associated file system does not support this function.
FS_STATUS_STORAGE_FULL Data space cannot be allocated.
FS_STATUS_JOURNAL_FULL Journaling space is full and new journaling block cannot be allocated.
FS_STATUS_MEDIA_NOT_READY (Only for manually mounted devices) Media is not present.
FS_STATUS_MEDIA_ERROR (Only for manually mounted devices) Media is in some inaccessible condition.
FS_STATUS_DATA_CORRUPTED (Only for manually mounted devices) The data is corrupted beyond repair. The volume needs format.

Async API: Immediate return values

FS_STATUS_OK Successfully issued request.
FS_STATUS_FATAL_ERROR The argument is invalid.

Description

Truncates file designated by fileHandle with current file position.

Both a sync and async style API are provided. To use the async API, set the user callback and parameters in asyncParams. For more information, see FSAsyncParams.

Do Not Call From

FSTruncateFile

Thread that displays graphics Do not call this function from a thread that displays graphics. This function may block indefinitely in error cases and the application must be able to display appropriate messages.
Thread that handles system messages Do not call this function from a thread that handles system messages. This function may block indefinitely in error cases and the application must be able to handle system events such as shutdown.
Callbacks Do not call this function from any callback function.
Interrupt handler Do not call this function from any interrupt handler.
Exception handler Do not call this function from any exception handler.

FSTruncateFileAsync

None.

See Also

File/Directory operations
FSOpenFile
FSGetPosFile
FSSetPosFile
FSCloseFile

Revision History

2014/09/16 Added "Thread that displays graphics" and "Thread that handles system messages" to "Do not call from".
2013/12/10 Added FS_STATUS_UNSUPPORTED_CMD to return values.
2013/06/28 Removed FS_STATUS_TOO_BIG from return values.
2013/05/23 Added FS_STATUS_DATA_CORRUPTED to return values.
2013/05/08 Automated cleanup pass.
2013/01/10 Added "Callback" to "Do not call from".
2012/07/20 Readability and correctness cleanup.
2011/02/20 Initial version.


CONFIDENTIAL