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[FreeRTOS-Plus-FAT Standard API Reference]

int ff_rmdir( const char *pcPath );
  Remove a directory from the embedded FAT file system. A directory can only be removed if it does not contain any files. Parameters:
pcDirectory A pointer to a standard null terminated C string that holds the name of the directory being removed. The string can include a relative path. 
Returns: If the directory was removed successfully then zero is returned. If the directory could not be removed then -1 is returned and the task's errno is set to indicate the reason. A task can obtain its errno value using the stdioGET_ERRNO() API function. Example usage:

void vExampleFunction( void )
/* Create a sub directory called subfolder, and sub directory within
subfolder called sub1. */

ff_mkdir( "subfolder" );
ff_mkdir( "subfolder/sub1" );

/* The directories can be accessed here. */

/* Delete the two sub directories again. */
ff_rmdir( "subfolder/sub1" );
ff_rmdir( "subfolder" );

Example use of the ff_rmdir() API function to delete a directory
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