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package main
import "C"
import (
"errors"
"unsafe"
)
//#include <stdlib.h>
//#include <xcb/xcb.h>
//#cgo linux LDFLAGS: -lxcb
import "C"
const (
xcbHostModeInsert = C.XCB_HOST_MODE_INSERT
xcbHostModeDelete = C.XCB_HOST_MODE_DELETE
xcbFamilyInternet = C.XCB_FAMILY_INTERNET
xcbFamilyDecnet = C.XCB_FAMILY_DECNET
xcbFamilyChaos = C.XCB_FAMILY_CHAOS
xcbFamilyServerInterpreted = C.XCB_FAMILY_SERVER_INTERPRETED
xcbFamilyInternet6 = C.XCB_FAMILY_INTERNET_6
)
func changeHosts(mode, family C.uint8_t, address string) error {
var c *C.xcb_connection_t
c = C.xcb_connect(nil, nil)
defer C.xcb_disconnect(c)
if err := xcbHandleConnectionError(c); err != nil {
return err
}
addr := C.CString(address)
cookie := C.xcb_change_hosts_checked(c, mode, family, C.ushort(len(address)), (*C.uchar)(unsafe.Pointer(addr)))
C.free(unsafe.Pointer(addr))
if err := xcbHandleConnectionError(c); err != nil {
return err
}
e := C.xcb_request_check(c, cookie)
if e != nil {
defer C.free(unsafe.Pointer(e))
return errors.New("xcb_change_hosts() failed")
}
return nil
}
func xcbHandleConnectionError(c *C.xcb_connection_t) error {
if errno := C.xcb_connection_has_error(c); errno != 0 {
switch errno {
case C.XCB_CONN_ERROR:
return errors.New("connection error")
case C.XCB_CONN_CLOSED_EXT_NOTSUPPORTED:
return errors.New("extension not supported")
case C.XCB_CONN_CLOSED_MEM_INSUFFICIENT:
return errors.New("memory not available")
case C.XCB_CONN_CLOSED_REQ_LEN_EXCEED:
return errors.New("request length exceeded")
case C.XCB_CONN_CLOSED_PARSE_ERR:
return errors.New("invalid display string")
case C.XCB_CONN_CLOSED_INVALID_SCREEN:
return errors.New("server has no screen matching display")
default:
return errors.New("generic X11 failure")
}
} else {
return nil
}
}
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