5 Input/Output Interfaces

 

This chapter defines the I/O-related COM interfaces which are defined by header files in the oskit/io directory. Most of these interfaces are fairly generic and can be used in a wide variety of situations. Some of these interfaces, such as the bufio interface, are extensions to other more primitive interfaces, and allow objects to export the same functionality in different forms, permitting clients to select the service that most directly meets their needs thereby reducing interface crossing overhead and increasing overall performance.

• 5.1 oskit_absio: Absolute I/O Interface
  • 5.1.1 read: Read from this object, starting at specified offset
  • 5.1.2 write: Write to this object, starting at specified offset
  • 5.1.3 getsize: Get the size of this object
  • 5.1.4 setsize: Set the size of this object
• 5.2 oskit_asyncio: Asynchronous I/O Interface
• 5.3 oskit_blkio: Block I/O Interface
  • 5.3.1 getblocksize: Return the minimum block size of this block I/O object
  • 5.3.2 read: Read from this object, starting at specified offset
  • 5.3.3 write: Write to this object, starting at specified offset
  • 5.3.4 getsize: Get the size of this object
  • 5.3.5 setsize: Set the size of this object
• 5.4 oskit_bufio: Buffer-based I/O interface
  • 5.4.1 map: Map some or all of this buffer into locally accessible memory
  • 5.4.2 unmap: Release a previously mapped region of this buffer
  • 5.4.3 wire: Wire a region of this buffer into contiguous physical memory
  • 5.4.4 unwire: Unwire a previously wired region of this buffer
  • 5.4.5 copy: Create a copy of the specified portion of this buffer
• 5.5 oskit_netio: Network packet I/O interface
  • 5.5.1 push: Push a packet through to the packet consumer
• 5.6 oskit_posixio: POSIX I/O interface
  • 5.6.1 stat: Get attributes of this object
  • 5.6.2 setstat: Set the attributes of this object
  • 5.6.3 pathconf: Get value of a configuration option variable
• 5.7 oskit_ttystream: Interface to Unix TTY-like streams
  • 5.7.1 getattr: Get the stream's current TTY attributes
  • 5.7.2 setattr: Set the stream's TTY attributes
  • 5.7.3 sendbreak: Send a break signal
  • 5.7.4 drain: Wait until all buffered output has been transmitted
  • 5.7.5 flush: Discared buffered input and/or output data
  • 5.7.6 flow: Suspend or resume data transmission or reception