io_setcookie(3) Library Functions Manual io_setcookie(3)NAME
io_setcookie - associate cookie with descriptor
SYNTAX
#include <io.h>
void io_setcookie(int64 fd,void* cookie);
DESCRIPTION
io_setcookie associates a cookie (pointer to some anonymous data structure) with this descriptor. Only one cookie can be associated with a
descriptor.
Use io_getcookie(3) to retrieve the cookie for a descriptor (usually after io_canread or io_canwrite brought it to your attention).
Please note that io_close does not deallocate your cookie. You need to do that yourself.
The idea is that you put the state associated with a TCP connection you serve in a common struct. Then you do not need to have your own
data structure to retrieve the state for a connection, you can just use the data structure io_wait already maintains. The lookup works in
constant time and should not cause any cache misses.
SEE ALSO io_wait(3), io_getcookie(3)io_setcookie(3)
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XGetEventData(3) XLIB FUNCTIONS XGetEventData(3)NAME
XGetEventData, XFreeEventData, XGenericEventCookie - retrieve and free additional event data through cookies.
SYNTAX
Bool XGetEventData(Display *display, XGenericEventCookie *cookie);
void XFreeEventData(Display *display, XGenericEventCookie *cookie);
ARGUMENTS
display Specifies the connection to the X server.
cookie Specifies the cookie to free or retrieve the data for.
STRUCTURES
typedef struct {
int type;
unsigned long serial;
Bool send_event;
Display *display;
int extension;
int evtype;
unsigned int cookie;
void *data;
} XGenericEventCookie;
DESCRIPTION
Some extension XGenericEvents require additional memory to store information. For these events, the library returns a XGenericEventCookie
with a token ('cookie') unique to this event. The XGenericEventCookie's data pointer is undefined until XGetEventData is called.
The XGetEventData function retrieves this extra data for the given cookie. No round-trip to the server is required. If the cookie is
invalid or the event is not an event handled by cookie handlers, False is returned. If XGetEventData returns True, the cookie's data
pointer points to the memory containing the event information. A client must call XFreeEventData to free this memory. XGetEventData
returns False for multiple calls for the same event cookie.
The XFreeEventData function frees the data associated with a cookie. A client must call XFreeEventData for each cookie claimed with
XGetEventData.
EXAMPLE CODE
XEvent event;
XGenericEventCookie *cookie = &ev;
XNextEvent(display, &event);
if (XGetEventData(display, cookie)) {
handle_cookie_event(cookie->data);
} else
handle_event(&event);
}
XFreeEventData(display, cookie);
NOTES
A cookie is defined as unclaimed if it has been returned to the client through XNextEvent but its data has not been retrieved via
XGetEventData. Subsequent calls to XNextEvent may free memory associated with unclaimed cookies. Multi-threaded X clients must ensure
that XGetEventData is called before the next call to XNextEvent.
SEE ALSO XNextEvent(3),
Xlib - C Language X Interface
X Version 11 libX11 1.5.0 XGetEventData(3)
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