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XIQUERYVERSION(3)					       XIQUERYVERSION(3)

NAME
     XIQueryVersion - announce and query the support XI2 version.

SYNOPSIS
     #include <X11/extensions/XInput2.h>

     Status XIQueryVersion( Display *display,
			    int *major_version_inout,
			    int *minor_version_inout);

     display
	    Specifies the connection to the X server.

     major_version_inout
	    Specifies the client's supported XI2 version, and
	    returns the server's supported version.

     minor_version_inout
	    Specifies the client's supported XI2 version, and
	    returns the server's supported version.

DESCRIPTION
	 XIQueryVersion announces the client's supported XI2 version to
	 the server and returns server's supported X Input version. Clients
	 are required to use XIQueryVersion instead of XGetExtensionVersion
	 if they use XI2 calls. The server may treat a client differently
	 depending on the supported version announced by the client.
	 The major_version_inout must be 2 or greater, otherwise a BadValue
	 error occurs.

	 If the server does not support XI2, XIQueryVersion returns BadRequest
	 to the client. Otherwise, XIQueryVersion returns Success. In both
	 cases major_version_inout and minor_version_inout are set to the
	 server's supported version.

	 If the client has previously called XIQueryVersion, then the result
	 depends on the previously requested version and the currently
	 requested version.

	 If either the previous or current requested versions is less than
	 2.2, or if the requested major version numbers do not match, then
	 consecutive calls to XIQueryVersion by the same client always
	 return the first returned major.minor version. If the client
	 requests a version lower than the first returned major.minor
	 version in a subsequent call, a BadValue error occurs.

	 If all of the requested versions are 2.2 or greater, then
	 consecutive calls to XIQueryVersion by the same client with the
	 same major version will return the requested version, but the server
	 will operate according to the highest requested version number or
	 the highest supported version, whichever is lower.

	 XIQueryVersion can generate a BadValue error.

EXAMPLES
	 int rc;
	 int major = 2;
	 int minor = 0;

	 rc = XIQueryVersion(dpy, &major, &minor);
	 if (rc == Success)
	     printf("XI2 supported. (%d.%d)\n", major, minor);
	 else if (rc == BadRequest)
	     printf("No XI2 support. (%d.%d only)\n", major, minor);
	 else
	     printf("Internal error\n");

DIAGNOSTICS
	 BadValue
		A value is outside of the permitted range.

				   05/18/2026		       XIQUERYVERSION(3)

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