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Diffstat (limited to 'xpa/man/man3/xpagetfd.3')
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diff --git a/xpa/man/man3/xpagetfd.3 b/xpa/man/man3/xpagetfd.3 new file mode 100644 index 0000000..1899880 --- /dev/null +++ b/xpa/man/man3/xpagetfd.3 @@ -0,0 +1,235 @@ +.\" 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++. 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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" +\&\fBXPAGetFd: retrieve data from one or more \s-1XPA\s0 servers and write to files\fR +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <xpa.h> +\& +\& int XPAGetFd(XPA xpa, +\& char *template, char *paramlist, char *mode, +\& int *fds, 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 +and write it to files associated with +one or more standard I/O fds (i.e, handles returned by \fIopen()\fR). +.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 \s-1ABS\s0(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 \fIXPAGetFd()\fR routine then retrieves data from the \s-1XPA\s0 servers, +and write these data to the fds associated with one or more fds +(i.e., results from open). Is n is positive, then there will be n fds +and the data from each server will be sent to a separate fd. If n is +negative, then there is only 1 fd and all data is sent to this single +fd. (The latter is how xpaget is implemented.) +.PP +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 mode string is of the form: \*(L"key1=value1,key2=value2,...\*(R" +The following keywords are recognized: +.PP +.Vb 3 +\& key value default explanation +\& \-\-\-\-\-\- \-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\- +\& ack true/false true if false, don\*(Aqt wait for ack from server (after callback completes) +.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 +\&\fBExample:\fR +.PP +.Vb 10 +\& #include <xpa.h> +\& #define NXPA 10 +\& int i, got; +\& int fds[NXPA]; +\& char *names[NXPA]; +\& char *messages[NXPA]; +\& for(i=0; i<NXPA; i++) +\& fds[i] = open(...); +\& got = XPAGetFd(NULL, "ds9", "file", NULL, fds, names, messages, NXPA); +\& for(i=0; i<got; i++){ +\& if( messages[i] != NULL ){ +\& /* 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 |