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author | William Joye <wjoye@cfa.harvard.edu> | 2016-10-17 15:27:21 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2016-10-17 15:27:21 (GMT) |
commit | 912e82088edadbdbf95d594f93ddc9dd99a305f8 (patch) | |
tree | 9153dcd3bcf256fb26ebdcbfd8a1a7d9132430f1 /xpa/man/man3/xpaget.3 | |
parent | fecf4a80a5080aa65e7c2d717f96e86ad04ca46c (diff) | |
parent | d604b7940b14efb191a38ef22c3a38fa3adba4d0 (diff) | |
download | blt-912e82088edadbdbf95d594f93ddc9dd99a305f8.zip blt-912e82088edadbdbf95d594f93ddc9dd99a305f8.tar.gz blt-912e82088edadbdbf95d594f93ddc9dd99a305f8.tar.bz2 |
Merge commit 'd604b7940b14efb191a38ef22c3a38fa3adba4d0' as 'xpa'
Diffstat (limited to 'xpa/man/man3/xpaget.3')
-rw-r--r-- | xpa/man/man3/xpaget.3 | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/xpa/man/man3/xpaget.3 b/xpa/man/man3/xpaget.3 new file mode 100644 index 0000000..4f03cf6 --- /dev/null +++ b/xpa/man/man3/xpaget.3 @@ -0,0 +1,244 @@ +.\" 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. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +\&\fBXPAGet: retrieve data from one or more \s-1XPA\s0 servers\fR +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <xpa.h> +\& +\& int XPAGet(XPA xpa, +\& char *template, char *paramlist, char *mode, +\& char **bufs, size_t *lens, char **names, char **messages, +\& int n); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +Retrieve data from one or more \s-1XPA\s0 servers whose class:name identifier +matches the specified template. +.PP +A +template +of the form \*(L"class1:name1\*(R" is sent to the +\&\s-1XPA\s0 name server, which returns a list of at most n matching \s-1XPA\s0 +servers. A connection is established with each of these servers and +the paramlist string is passed to the server as the data transfer +request is initiated. If an \s-1XPA\s0 struct is passed to the call, then the +persistent connections are updated as described above. Otherwise, +temporary connections are made to the servers (which will be closed +when the call completes). +.PP +The \fIXPAGet()\fR routine then retrieves data from at most n \s-1XPA\s0 servers, +places these data into n allocated buffers and places the buffer +pointers in the bufs array. The length of each buffer is stored in the +lens array. A string containing the class:name and ip:port is stored +in the name array. If a given server returned an error or the server +callback sends a message back to the client, then the message will be +stored in the associated element of the messages array. \s-1NB:\s0 if +specified, the name and messages arrays must be of size n or greater. +.PP +The returned message string will be of the form: +.PP +.Vb 1 +\& XPA$ERROR error\-message (class:name ip:port) +.Ve +.PP +or +.PP +.Vb 1 +\& XPA$MESSAGE message (class:name ip:port) +.Ve +.PP +Note that when there is an error stored in an messages entry, the +corresponding bufs and lens entry may or may not be \s-1NULL\s0 and 0 +(respectively), depending on the particularities of the server. +.PP +The return value will contain the actual number of servers that were +processed. This value thus will hold the number of valid entries in +the bufs, lens, names, and messages arrays, and can be used to loop +through these arrays. In names and/or messages is \s-1NULL\s0, no information is +passed back in that array. +.PP +The bufs, names, and messages arrays should be freed upon completion (if +they are not \s-1NULL\s0); +.PP +The mode string is of the form: \*(L"key1=value1,key2=value2,...\*(R" +The following keywords are recognized: +.PP +.Vb 4 +\& key value default explanation +\& \-\-\-\-\-\- \-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\- +\& ack true/false true if false, don\*(Aqt wait for ack from server (after callback completes) +\& doxpa true/false true client processes xpa requests +.Ve +.PP +The ack keyword is not very useful, since the server completes the callback +in order to return the data anyway. It is here for completion (and perhaps +for future usefulness). +.PP +Normally, an \s-1XPA\s0 client will process incoming \s-1XPA\s0 server requests +while awaiting the completion of the client request. Setting this +variable to \*(L"false\*(R" will prevent \s-1XPA\s0 server requests from being +processed by the client. +.PP +\&\fBExample:\fR +.PP +.Vb 1 +\& #include <xpa.h> +\& +\& #define NXPA 10 +\& int i, got; +\& size_t lens[NXPA]; +\& char *bufs[NXPA]; +\& char *names[NXPA]; +\& char *messages[NXPA]; +\& got = XPAGet(NULL, "ds9", "file", NULL, bufs, lens, names, messages, +\& NXPA); +\& for(i=0; i<got; i++){ +\& if( messages[i] == NULL ){ +\& /* process buf contents */ +\& ProcessImage(bufs[i], ...); +\& free(bufs[i]); +\& } +\& else{ +\& /* error processing */ +\& fprintf(stderr, "ERROR: %s (%s)\en", messages[i], names[i]); +\& } +\& if( names[i] ) +\& free(names[i]); +\& if( messages[i] ) +\& free(messages[i]); +\& } +.Ve +.SH "SEE ALSO" +.IX Header "SEE ALSO" +See xpa(n) for a list of \s-1XPA\s0 help pages |