diff options
Diffstat (limited to 'xpa/man/mann/xpaintro.n')
-rw-r--r-- | xpa/man/mann/xpaintro.n | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/xpa/man/mann/xpaintro.n b/xpa/man/mann/xpaintro.n new file mode 100644 index 0000000..2978e6b --- /dev/null +++ b/xpa/man/mann/xpaintro.n @@ -0,0 +1,250 @@ +.\" Automatically generated by Pod::Man 2.22 (Pod::Simple 3.13) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. Capital omega is used to do unbreakable dashes and +.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, +.\" nothing in troff, for use with C<>. +.tr \(*W- +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" Escape single quotes in literal strings from groff's Unicode transform. +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" +.\" If the F register is turned on, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.ie \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.el \{\ +. de IX +.. +.\} +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. No user-serviceable parts. +. \" fudge factors for nroff and troff +.if n \{\ +. ds #H 0 +. ds #V .8m +. ds #F .3m +. ds #[ \f1 +. ds #] \fP +.\} +.if t \{\ +. ds #H ((1u-(\\\\n(.fu%2u))*.13m) +. ds #V .6m +. ds #F 0 +. ds #[ \& +. ds #] \& +.\} +. \" simple accents for nroff and troff +.if n \{\ +. ds ' \& +. ds ` \& +. ds ^ \& +. ds , \& +. ds ~ ~ +. ds / +.\} +.if t \{\ +. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" +. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' +. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' +. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' +. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' +. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' +.\} +. \" troff and (daisy-wheel) nroff accents +.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' +.ds 8 \h'\*(#H'\(*b\h'-\*(#H' +.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] +.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' +.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' +.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] +.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] +.ds ae a\h'-(\w'a'u*4/10)'e +.ds Ae A\h'-(\w'A'u*4/10)'E +. \" corrections for vroff +.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' +.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' +. \" for low resolution devices (crt and lpr) +.if \n(.H>23 .if \n(.V>19 \ +\{\ +. ds : e +. ds 8 ss +. ds o a +. ds d- d\h'-1'\(ga +. ds D- D\h'-1'\(hy +. ds th \o'bp' +. ds Th \o'LP' +. ds ae ae +. ds Ae AE +.\} +.rm #[ #] #H #V #F C +.\" ======================================================================== +.\" +.IX Title "xpaintro n" +.TH xpaintro n "July 23, 2013" "version 2.1.15" "SAORD Documentation" +.\" For nroff, turn off justification. Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +\&\fBXPAIntro: Introduction to the \s-1XPA\s0 Messaging System\fR +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +A brief introduction to the \s-1XPA\s0 messaging system, which provides +seamless communication between all kinds of Unix event-driven +programs, including X programs, Tcl/Tk programs, and Perl programs. +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +The \s-1XPA\s0 messaging system provides seamless communication between all +kinds of Unix programs, including X programs, Tcl/Tk programs, and +Perl programs. It also provides an easy way for users to communicate +with these XPA-enabled programs by executing \s-1XPA\s0 client commands in +the shell or by utilizing such commands in scripts. Because \s-1XPA\s0 works +both at the programming level and the shell level, it is a powerful +tool for unifying any analysis environment: users and programmers have +great flexibility in choosing the best level or levels at which to +access \s-1XPA\s0 services, and client access can be extended or modified +easily at any time. +.PP +A program becomes an XPA-enabled server by defining named points of +public access through which data and commands can be exchanged with +other client programs (and users). Using standard \s-1TCP\s0 sockets as +a transport mechanism, \s-1XPA\s0 supports both single-point and broadcast +messaging to and from these servers. It supports direct communication +between clients and servers, or indirect communication via an +intermediate message bus emulation program. Host-based access control +is implemented, as is as the ability to communicate with \s-1XPA\s0 servers +across a network. +.PP +\&\s-1XPA\s0 implements a layered interface that is designed to be useful both +to software developers and to users. The interface consists of a +library of \s-1XPA\s0 client and server routines for use in programs and a +suite of high-level user programs built on top of these libraries. +Using the \s-1XPA\s0 library, access points can be added to +Tcl/Tk +programs, +Xt +programs, or to Unix programs that use the \s-1XPA\s0 event loop or any +event loop based on \fIselect()\fR. Client access subroutines can be added +to any Tcl/Tk or Unix program. Client access also is supported at the +command line via a suite of high-level programs. +.PP +The major components of the \s-1XPA\s0 layered interface are: +.IP "\(bu" 4 +A set of \s-1XPA\s0 server routines, centered on +\&\fIXPANew()\fR, +which are used by \s-1XPA\s0 server programs to tag public access points with +string identifiers and to register send and receive callbacks for +these access points. +.IP "\(bu" 4 +A set of \s-1XPA\s0 client routines, centered on the +\&\fIXPASet()\fR +and +\&\fIXPAGet()\fR, +which are used by external client applications to exchange data and +commands with an \s-1XPA\s0 server. +.IP "\(bu" 4 +High-level programs, centered on +xpaset +and +xpaget, +which allow data +and information to be exchanged with \s-1XPA\s0 server programs from the +command line and from scripts. These programs have the command syntax: +.Sp +.Vb 2 +\& [data] | xpaset [qualifiers ...] +\& xpaget [qualifiers ...] +.Ve +.IP "\(bu" 4 +An \s-1XPA\s0 name server program, +xpans, +through which \s-1XPA\s0 access point names are +registered by servers and distributed to clients. +.PP +Defining an \s-1XPA\s0 access point is easy: a server application calls +\&\fIXPANew()\fR, +\&\fIXPACmdNew()\fR, +or the experimental +\&\fIXPAInfoNew()\fR +routine to +create a named public access point. An \s-1XPA\s0 service can specify \*(L"send\*(R" +and \*(L"receive\*(R" callback procedures (or an \*(L"info\*(R" procedure in the case +of \fIXPAInfoNew()\fR) to be executed by the program when an external +process either sends data or commands to this access point or requests +data or information from this access point. Either of the callbacks +can be omitted, so that a particular access point can be specified as +read-only, read-write, or write-only. Application-specific client +data can be associated with these callbacks. Having defined one or +more public access points in this way, an \s-1XPA\s0 server program enters +its usual event loop (or uses the standard \s-1XPA\s0 event loop). +.PP +Clients communicate with these \s-1XPA\s0 public access points +using programs such as +xpaget, +xpaset, and +xpainfo +(at the command line), +or routines such as +\&\fIXPAGet()\fR, +\&\fIXPASet()\fR, +and +\&\fIXPAInfo()\fR +within a program. Both methods require specification of the name of +the access point. The xpaget program returns data or other +information from an \s-1XPA\s0 server to its standard output, while the +xpaset program sends data or commands from its standard input to an +\&\s-1XPA\s0 application. The corresponding \s-1API\s0 routines set/get data to/from +memory, returning error messages and other info as needed. If a +template +is used to specify the access point name (e.g., \*(L"ds9*\*(R"), then +communication will take place with all servers matching that template. +.PP +Please note that \s-1XPA\s0 currently is not thread-safe. All \s-1XPA\s0 calls must be +in the same thread. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +See xpa(n) for a list of \s-1XPA\s0 help pages |