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x11vnc keeps a copy of the X server's frame buffer in RAM.The X11 programming interface XShmGetImage is used to retrieve the frame buffer pixel data. x11vnc compares the X server's frame buffer against its copy to see which pixel regions have changed (and hence need to be sent to the VNC viewers.)
In Unix and other POSIX-compatible systems, the parent process can retrieve the exit status of a child process using the wait() family of system calls defined in wait.h. [10] Of these, the waitid() [11] call retrieves the full exit status, but the older wait() and waitpid() [12] calls retrieve only the least significant 8 bits of the exit status.
The VNC server is the program on the machine that shares some screen (and may not be related to a physical display: the server can be "headless"), and allows the client to share control of it. The VNC client (or viewer) is the program that represents the screen data originating from the server, receives updates from it, and presumably controls ...
RealVNC is a company that provides remote access software. Their VNC Connect software consists of a server (VNC Server) and client (VNC Viewer) application, which exchange data over the RFB protocol to allow the Viewer to control the Server's screen remotely.
TightVNC is a free and open-source remote desktop software server and client application for Linux and Windows.A server for macOS is available under a commercial source code license only, without SDK or binary version provided. [3]
When the child process terminates ("dies"), either normally by calling exit, or abnormally due to a fatal exception or signal (e.g., SIGTERM, SIGINT, SIGKILL), an exit status is returned to the operating system and a SIGCHLD signal is sent to the parent process. The exit status can then be retrieved by the parent process via the wait system call.
File status okay; about to open data connection. 200 Series: The requested action has been successfully completed. 202: Command not implemented, superfluous at this site. 211: System status, or system help reply. 212: Directory status. 213: File status. 214: Help message. Explains how to use the server or the meaning of a particular non ...
The server site does not have to configure its firewall/NAT to allow access on a defined port; the onus is on the viewer, which is useful if the server site has no computer expertise, while the viewer user would be expected to be more knowledgeable.