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-.\" ========================================================================
-.\"
-.IX Title "xpainfonew 3"
-.TH xpainfonew 3 "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"
-\&\fBXPAInfoNew: define an \s-1XPA\s0 info public access point\fR
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-.Vb 1
-\& #include <xpa.h>
-\&
-\& XPA XPAInfoNew(char *class, char *name,
-\& int (*info_callback)(),
-\& void *info_data, char *info_mode);
-.Ve
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-[\s-1NB:\s0 this is an experimental interface, new to \s-1XPA\s0 2.0, whose value
-and best use is evolving.]
-.PP
-A program can register interest in receiving a short message about a
-particular topic from any other process that cares to send such a
-message. Neither has to be an \s-1XPA\s0 server. For example, if a user
-starts to work with a new image file called new.fits, she might
-wish to alert interested programs about this new file by sending a
-short message using xpainfo:
-.PP
-.Vb 1
-\& xpainfo IMAGEFILE /data/new.fits
-.Ve
-.PP
-In this example, each process that has used the \fIXPAInfoNew()\fR call to
-register interest in messages associated with the identifier \s-1IMAGEFILE\s0
-will have its \fIinfo_callback()\fR executed with the following calling
-sequence:
-.PP
-.Vb 4
-\& int info_cb(void *info_data, void *call_data, char *paramlist)
-\& {
-\& XPA xpa = (XPA)call_data;
-\& }
-.Ve
-.PP
-The arguments passed to this routine are equivalent to those sent in
-the \fIsend_callback()\fR routine. The main difference is that there is no
-buf sent to the info callback: this mechanism is meant for short
-announcement of messages of interest to many clients.
-.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
-\& \-\-\-\-\-\- \-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\- \-\-\-\-\-\-\-\-\-\-\-
-\& acl true/false true enable access control
-.Ve
-.PP
-Because no buf is passed to this callback, the usual buf-related keywords
-are not applicable here.
-.PP
-The information sent in the parameter list is arbitrary. However, we
-envision sending information such as file names or \s-1XPA\s0 access points
-from which to collect more data. Note that the xpainfo program and
-the \fIXPAInfo()\fR routine that cause the info_callback to execute do not
-wait for the callback to complete before returning.
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-See xpa(n) for a list of \s-1XPA\s0 help pages
generated by cgit v0.12 at 2024-07-08 06:44:12 (GMT)