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How to prevent a C++ program reading a file that is still being written to.?
Post 302907145 by chris01010 on Thursday 26th of June 2014 07:53:15 AM
06-26-2014
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LEARN ABOUT ULTRIX
xvqueryadaptors
XvQueryAdaptors(3) libXv Functions XvQueryAdaptors(3) NAME
XvQueryAdaptors - return adaptor information for a screen SYNOPSIS
#include <X11/extensions/Xvlib.h> int XvQueryAdaptors(Display *dpy, Window window, unsigned int *p_num_adaptors, XvAdaptorInfo **pp_adaptor_info); ARGUMENTS
dpy Specifies the connection to the X server. window Specifies a window of the screen for which the adaptor information is desired. p_num_adaptors A pointer to where the number of adaptors for the specified screen is returned. pp_adaptor_info A pointer to where the list of returned adaptor information is returned. DESCRIPTION
XvQueryAdaptors(3) returns an video adaptor information for the screen of the specified drawable. The XvAdaptorInfo structure has the following organiza- tion: typedef struct { XvPortID base_id; unsigned long num_ports; char type; char *name; unsigned long num_formats; XvFormat *formats; unsigned long num_adaptors; } XvAdaptorInfo; base_id The resource ID of the first adaptor port. num_ports The number of ports supported by the adaptor. type A bit mask with the value XvInputMask asserted if the adaptor supports video input, and value XvOutputMask asserted if the adaptor supports video output. In Xv protocol 2.2 and later, there are 3 new bits defined - XvVideoMask, XvStillMask and XvImageMask indi- cating that the adaptor is capable of video, still or image primitives respectively. name A vendor specific name that identifies the adaptor. num_formats The number of depth/visual id formats supported by the adaptor. formats A pointer to an array of XvFormat structures. The XvFormat structure has the following organization: typedef struct { char depth; unsigned long visual_id; } XvFormat; depth A drawable depth supported by the adaptor. visual_id A visual-id supported for the given depth by the adaptor. RETURN VALUES
[Success] Returned if XvQueryAdaptors(3) completed successfully. [XvBadExtension] Returned if the Xv extension is unavailable. [XvBadAlloc] Returned if XvQueryAdaptors(3) failed to allocate memory to process the request. DIAGNOSTICS
[Drawable] Returned if the requested drawable does not exist. SEE ALSO
XvFreeAdaptorInfo(3) X Version 11 libXv 1.0.7 XvQueryAdaptors(3)