vsock – Linux VSOCK address family Synopsis #include <sys/socket.h> #include <linux/vm_sockets.h> stream_socket = socket(AF_VSOCK, SOCK_STREAM, 0); datagram_socket = socket(AF_VSOCK, SOCK_DGRAM, 0); Description The VSOCK address family facilitates communication between virtual machines and the host they are running on. This address family is used by guest agents and hypervisor services that need a communications channel that…
VSL – Shared Memory Logging Overview This document describes the format and content of all the Varnish shared memory logging tags. These tags are used by the varnishlog(1), varnishtop(1), etc. logging tools supplied with Varnish. VSL tags Backend – Backend selected Logged when a connection is selected for handling a backend request. The format is:…
Varnish VSL Query Expressions – Overview The Varnish VSL Query Expressions extracts transactions from the Varnish shared memory log, and perform queries on the transactions before reporting matches. A transaction is a set of log lines that belongs together, e.g. a client request or a backend request. The API monitors the log, and collects all…
virtual-filesystems – event signalling that virtual filesystems have been mounted Synopsis virtual-filesystems [ENV]… Description The virtual-filesystems event is generated by the mountall(8) daemon after it has mounted all virtual filesystems listed in fstab(5). mountall(8) emits this event as an informational signal, services and tasks started or stopped by this event will do so in parallel…
video_format – Proposal For A Video Format Preference Specification Description A number of different programs that create or work with video material need to know whether to generate their output in NTSC or PAL format. The ones that I’ve seen seem to have a hard-coded preference for one unless the user specifies the other. Overriding…
vgagl – a fast framebuffer-level graphics library based on svgalib Table Of Contents 0. Introduction 1. How to use vgagl 2. Description of vgagl functions 3. Macros defined in vgagl.h 0. Introduction This is a fast framebuffer-level graphics library for linear 1, 2, 3 and 4 byte-per-pixel modes (256-color, hicolor, truecolor). It uses a limited…
vdso – overview of the virtual ELF dynamic shared object Synopsis #include <sys/auxv.h> void *vdso = (uintptr_t)getauxval(AT_SYSINFO_EHDR); Description The "vDSO" (virtual dynamic shared object) is a small shared library that the kernel automatically maps into the address space of all user-space applications. Applications usually do not need to concern themselves with these details as the…
VCL – Varnish Configuration Language Description The VCL language is a small domain-specific language designed to be used to describe request handling and document caching policies for Varnish Cache. When a new configuration is loaded, the varnishd management process translates the VCL code to C and compiles it to a shared object which is then…
varnish-counters – Varnish counter field definitions Counter Levels INFO – Informational counters Counters giving runtime information DIAG – Diagnostic counters Counters giving diagnostic information DEBUG – Debug counters Counters giving Varnish internals debug information Main Counters uptime – Child process uptime (INFO) How long the child process has been running. sess_conn – Sessions accepted (INFO)…
Varnish CLI – Varnish Command Line Interface Description Varnish as a command line interface (CLI) which can control and change most of the operational parameters and the configuration of Varnish, without interrupting the running service. The CLI can be used for the following tasks: configuration You can upload, change and delete VCL files from the…
uts_namespaces – overview of Linux UTS namespaces Description UTS namespaces provide isolation of two system identifiers: the hostname and the NIS domain name. These identifiers are set using sethostname(2) and setdomainname(2), and can be retrieved using uname(2), gethostname(2), and getdomainname(2). Changes made to these identifiers are visible to all other processes in the same UTS…
UTF-8 – an ASCII compatible multibyte Unicode encoding Description The Unicode 3.0 character set occupies a 16-bit code space. The most obvious Unicode encoding (known as UCS-2) consists of a sequence of 16-bit words. Such strings can contain—as part of many 16-bit characters—bytes such as ‘
UTF-8 – an ASCII compatible multibyte Unicode encoding Description The Unicode 3.0 character set occupies a 16-bit code space. The most obvious Unicode encoding (known as UCS-2) consists of a sequence of 16-bit words. Such strings can contain—as part of many 16-bit characters—bytes such as ‘
user-session-keyring – per-user default session keyring Description The user session keyring is a keyring used to anchor keys on behalf of a user. Each UID the kernel deals with has its own user session keyring that is shared by all processes with that UID. The user session keyring has a name (description) of the form…
user-keyring – per-user keyring Description The user keyring is a keyring used to anchor keys on behalf of a user. Each UID the kernel deals with has its own user keyring that is shared by all processes with that UID. The user keyring has a name (description) of the form _uid.<UID> where <UID> is the…
RXVT REFERENCE – FAQ, command sequences and other background information Synopsis # set a new font set printf ‘\33]50;%s’ 9×15,xft:Kochi" Mincho" # change the locale and tell rxvt-unicode about it export LC_CTYPE=ja_JP.EUC-JP; printf "\33]701;$LC_CTYPE" # set window title printf ‘\33]2;%s’ "new window title" Description This document contains the FAQ, the RXVT TECHNICAL REFERENCE documenting all…
RXVT REFERENCE – FAQ, command sequences and other background information Synopsis # set a new font set printf ‘\33]50;%s’ 9×15,xft:Kochi" Mincho" # change the locale and tell rxvt-unicode about it export LC_CTYPE=ja_JP.EUC-JP; printf "\33]701;$LC_CTYPE" # set window title printf ‘\33]2;%s’ "new window title" Description This document contains the FAQ, the RXVT TECHNICAL REFERENCE documenting all…
RXVT REFERENCE – FAQ, command sequences and other background information Synopsis # set a new font set printf ‘\33]50;%s’ 9×15,xft:Kochi" Mincho" # change the locale and tell rxvt-unicode about it export LC_CTYPE=ja_JP.EUC-JP; printf "\33]701;$LC_CTYPE" # set window title printf ‘\33]2;%s’ "new window title" Description This document contains the FAQ, the RXVT TECHNICAL REFERENCE documenting all…
RXVT REFERENCE – FAQ, command sequences and other background information Synopsis # set a new font set printf ‘\33]50;%s’ 9×15,xft:Kochi" Mincho" # change the locale and tell rxvt-unicode about it export LC_CTYPE=ja_JP.EUC-JP; printf "\33]701;$LC_CTYPE" # set window title printf ‘\33]2;%s’ "new window title" Description This document contains the FAQ, the RXVT TECHNICAL REFERENCE documenting all…