XAddConnectionWatch
NAMESYNTAX
ARGUMENTS
DESCRIPTION
SEE ALSO
NAME
XAddConnectionWatch, XRemoveConnectionWatch, XProcessInternalConnection, XInternalConnectionNumbers − handle Xlib internal connections
SYNTAX
|
typedef void (*XConnectionWatchProc)(Display *display, XPointer client_data, int fd, Bool opening, XPointer *watch_data); | |
|
Status XAddConnectionWatch(Display *display, XWatchProc procedure, XPointer client_data); | |
|
Status XRemoveConnectionWatch(Display *display, XWatchProc procedure, XPointer client_data); | |
|
void XProcessInternalConnection(Display *display, int fd); | |
|
Status XInternalConnectionNumbers(Display *display, int **fd_return, int *count_return); |
ARGUMENTS
client_data
Specifies the additional client data.
count_return
Returns the number of file descriptors.
|
display |
Specifies the connection to the X server. |
|||
|
fd |
Specifies the file descriptor. |
|||
|
fd_return |
Returns the file descriptors. |
|||
|
procedure |
Specifies the procedure to be called. |
DESCRIPTION
The XAddConnectionWatch function registers a procedure to be called each time Xlib opens or closes an internal connection for the specified display. The procedure is passed the display, the specified client_data, the file descriptor for the connection, a Boolean indicating whether the connection is being opened or closed, and a pointer to a location for private watch data. If opening is True, the procedure can store a pointer to private data in the location pointed to by watch_data; when the procedure is later called for this same connection and opening is False, the location pointed to by watch_data will hold this same private data pointer.
This function can be called at any time after a display is opened. If internal connections already exist, the registered procedure will immediately be called for each of them, before XAddConnectionWatch returns. XAddConnectionWatch returns a nonzero status if the procedure is successfully registered; otherwise, it returns zero.
The registered procedure should not call any Xlib functions. If the procedure directly or indirectly causes the state of internal connections or watch procedures to change, the result is not defined. If Xlib has been initialized for threads, the procedure is called with the display locked and the result of a call by the procedure to any Xlib function that locks the display is not defined unless the executing thread has externally locked the display using XLockDisplay.
The XRemoveConnectionWatch function removes a previously registered connection watch procedure. The client_data must match the client_data used when the procedure was initially registered.
The XProcessInternalConnection function processes input available on an internal connection. This function should be called for an internal connection only after an operating system facility (for example, select or poll) has indicated that input is available; otherwise, the effect is not defined.
The XInternalConnectionNumbers function returns a list of the file descriptors for all internal connections currently open for the specified display. When the allocated list is no longer needed, free it by using XFree. This functions returns a nonzero status if the list is successfully allocated; otherwise, it returns zero.
SEE ALSO
Xlib − C Language X Interface
More Linux Commands
manpages/vhangup.8.html
vhangup(8) - Cause a virtually hangup on the specified termi
vhangup simulates a hangup on the specified terminals. Not existing device files or devices will be ignored. EXAMPLES vhangup /dev/tty1 /dev/tty2 /dev/tty3 /dev
manpages/git-stage.1.html
git-stage(1) - Add file contents to the staging area........
This is a synonym for git-add(1). Please refer to the documentation of that command. GIT Part of the git(1) suite git-stage.1 (Commands - Linux manual page)
manpages/Tk_GetAtomName.3.html
Tk_GetAtomName(3) - manage cache of X atoms - Linux man page
These procedures are similar to the Xlib procedures XInternAtom and XGetAtomName. Tk_InternAtom returns the atom identifier associated with string given by name
manpages/gobject-query.1.html
gobject-query(1) - display a tree of types - Linux man page
gobject-query is a small utility that draws a tree of types. gobject-query takes a mandatory argument that specifies whether it should iterate over the fundamen
manpages/XEqualRegion.3.html
XEqualRegion(3) - determine if regions are empty or equal...
The XEmptyRegion function returns True if the region is empty. The XEqualRegion function returns True if the two regions have the same offset, size, and shape.
manpages/more.1.html
more(1) - file perusal filter for crt viewing (Man Page)....
more is a filter for paging through text one screenful at a time. This version is especially primitive. Users should realize that less(1) provides more(1) emula
manpages/audit_get_reply.3.html
audit_get_reply(3) - Get the audit system's reply (ManPage)
This function gets the next data packet sent on the audit netlink socket. This function is usually called after sending a command to the audit system. fd should
manpages/getpid.2.html
getpid(2) - get process identification - Linux manual page
getpid() returns the process ID of the calling process. (This is often used by routines that generate unique temporary filenames.) getppid() returns the process
manpages/SDL_SetPalette.3.html
SDL_SetPalette(3) - Sets the colors in the palette of an 8-b
Sets a portion of the palette for the given 8-bit surface. Palettized (8-bit) screen surfaces with the SDL_HWPALETTE flag have two palettes, a logical palette t
manpages/vcsa.4.html
vcsa(4) - virtual console memory (Special - Linux man page)
/dev/vcs0 is a character device with major number 7 and minor number 0, usually of mode 0644 and owner root.tty. It refers to the memory of the currently displa
manpages/nice.2.html
nice(2) - change process priority - Linux manual page.......
nice() adds inc to the nice value for the calling process. (A higher nice value means a low priority.) Only the superuser may specify a negative increment, or p
manpages/Mail::SPF::Result.3pm.html
Mail::SPF::Result(3pm) - SPF result class - Linux man page
An object of class Mail::SPF::Result represents the result of an SPF request. There is usually no need to construct an SPF result object directly using the new
