fbio(7I)							  Ioctl Requests							  fbio(7I)

NAME

       fbio - frame buffer control operations

DESCRIPTION

       The frame buffers provided with this release support the same general interface that is defined by <sys/fbio.h>. Each responds to an FBIOG-
       TYPE ioctl(2) request which returns information in a fbtype structure.

       Each device has an FBTYPE which is used by higher-level software to determine how to perform graphics functions. Each  device  is  used	by
       opening	it,  doing an FBIOGTYPE ioctl() to see which frame buffer type is present, and thereby selecting the appropriate device-management
       routines.

       FBIOGINFO returns information specific to the GS accelerator.

       FBIOSVIDEO and FBIOGVIDEO are general-purpose ioctl() requests for controlling possible video features  of  frame  buffers.  These  ioctl()
       requests  either  set  or  return  the  value  of  a  flags  integer. At this point, only the FBVIDEO_ON option is available, controlled by
       FBIOSVIDEO. FBIOGVIDEO returns the current video state.

       The FBIOSATTR and FBIOGATTR ioctl() requests allow access to special features of newer frame buffers. They use  the   fbsattr  and  fbgattr
       structures.

       Some  color  frame  buffers  support  the  FBIOPUTCMAP and FBIOGETCMAP ioctl() requests, which provide access to the colormap. They use the
       fbcmap structure.

       Also, some framebuffers with multiple colormaps will either encode the colormap identifier in the high-order bits of the "index"  field	in
       the fbcmap structure, or use the FBIOPUTCMAPI and FBIOGETCMAPI ioctl() requests.

       FBIOVERTICAL is used to wait for the start of the next vertical retrace period.

       FBIOVRTOFFSET  Returns  the offset to a read-only vertical retrace page for those framebuffers that support it.	This vertical retrace page
       may be mapped into user space with mmap(2). The first word of the vertical retrace page (type unsigned int) is a  counter  that	is  incre-
       mented every time there is a vertical retrace.  The user process can use this counter in a variety of ways.

       FBIOMONINFO returns a mon_info structure which contains information about the monitor attached to the framebuffer, if available.

       FBIOSCURSOR,  FBIOGCURSOR,  FBIOSCURPOS	and FBIOGCURPOS are used to control the hardware cursor for those framebuffers that have this fea-
       ture. FBIOGCURMAX returns the maximum sized cursor supported by the framebuffer.  Attempts to create a cursor larger than this will fail.

       Finally FBIOSDEVINFO and FBIOGDEVINFO are used to transfer variable-length, device-specific information into and out of framebuffers.

SEE ALSO

       ioctl(2), mmap(2), cgsix(7D)

BUGS

       The FBIOSATTR and FBIOGATTR ioctl() requests are only supported by frame buffers which emulate older frame buffer types. If a frame  buffer
       emulates another frame buffer, FBIOGTYPE returns the emulated type. To get the real type, use FBIOGATTR.

       The  FBIOGCURPOS  ioctl	was incorrectly defined in previous operating systems, and older code running in binary compatibility mode may get
       incorrect results.

SunOS 5.10							    12 May 2003 							  fbio(7I)