Is XVFB(X window system virtual frame buffer ) open source

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Operating Systems AIX Is XVFB(X window system virtual frame buffer ) open source
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Old 07-16-2014
Is XVFB(X window system virtual frame buffer ) open source

I would like to know XVFB is open source or not.
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XVFB(1) 						      General Commands Manual							   XVFB(1)

Xvfb - virtual framebuffer X server for X Version 11 SYNOPSIS
Xvfb [ option ] ... DESCRIPTION
Xvfb is an X server that can run on machines with no display hardware and no physical input devices. It emulates a dumb framebuffer using virtual memory. The primary use of this server was intended to be server testing. The fb code for any depth can be exercised with this server without the need for real hardware that supports the desired depths. The X community has found many other novel uses for Xvfb, including testing clients against unusual depths and screen configurations, doing batch processing with Xvfb as a background rendering engine, load testing, as an aid to porting the X server to a new platform, and providing an unobtrusive way to run applications that don't really need an X server but insist on having one anyway. OPTIONS
In addition to the normal server options described in the Xserver(1) manual page, Xvfb accepts the following command line switches: -screen screennum WxHxD This option creates screen screennum and sets its width, height, and depth to W, H, and D respectively. By default, only screen 0 exists and has the dimensions 1280x1024x8. -pixdepths list-of-depths This option specifies a list of pixmap depths that the server should support in addition to the depths implied by the supported screens. list-of-depths is a space-separated list of integers that can have values from 1 to 32. -fbdir framebuffer-directory This option specifies the directory in which the memory mapped files containing the framebuffer memory should be created. See FILES. This option only exists on machines that have the mmap and msync system calls. -shmem This option specifies that the framebuffer should be put in shared memory. The shared memory ID for each screen will be printed by the server. The shared memory is in xwd format. This option only exists on machines that support the System V shared memory interface. If neither -shmem nor -fbdir is specified, the framebuffer memory will be allocated with malloc(). -linebias n This option specifies how to adjust the pixelization of thin lines. The value n is a bitmask of octants in which to prefer an axial step when the Bresenham error term is exactly zero. See the file Xserver/mi/miline.h for more information. This option is probably only useful to server developers to experiment with the range of line pixelization possible with the fb code. -blackpixel pixel-value, -whitepixel pixel-value These options specify the black and white pixel values the server should use. FILES
The following files are created if the -fbdir option is given. framebuffer-directory/Xvfb_screen<n> Memory mapped file containing screen n's framebuffer memory, one file per screen. The file is in xwd format. Thus, taking a full- screen snapshot can be done with a file copy command, and the resulting snapshot will even contain the cursor image. EXAMPLES
Xvfb :1 -screen 0 1600x1200x32 The server will listen for connections as server number 1, and screen 0 will be depth 32 1600x1200. Xvfb :1 -screen 1 1600x1200x16 The server will listen for connections as server number 1, will have the default screen configuration (one screen, 1280x1024x8), and screen 1 will be depth 16 1600x1200. Xvfb -pixdepths 3 27 -fbdir /var/tmp The server will listen for connections as server number 0, will have the default screen configuration (one screen, 1280x1024x8), will also support pixmap depths of 3 and 27, and will use memory mapped files in /var/tmp for the framebuffer. xwud -in /var/tmp/Xvfb_screen0 Displays screen 0 of the server started by the preceding example. SEE ALSO
X(7), Xserver(1), xwd(1), xwud(1), XWDFile.h AUTHORS
David P. Wiggins, The Open Group, Inc. X Version 11 xorg-server 1.12.4 XVFB(1)

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