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author | William Joye <wjoye@cfa.harvard.edu> | 2017-10-26 16:45:12 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2017-10-26 16:45:12 (GMT) |
commit | dd1df8d8538f275b17e0d9d50dca19f4d44595fd (patch) | |
tree | 624bc07023b33668147eaa9097279c6fc92b4e48 /xpa/man/man3/xpainfonew.3 | |
parent | 79d64f400391ce81b4eda73977cb40099256b348 (diff) | |
parent | 6054f36bb658916bd231b9002efb94444e2871c8 (diff) | |
download | blt-dd1df8d8538f275b17e0d9d50dca19f4d44595fd.zip blt-dd1df8d8538f275b17e0d9d50dca19f4d44595fd.tar.gz blt-dd1df8d8538f275b17e0d9d50dca19f4d44595fd.tar.bz2 |
Merge commit '6054f36bb658916bd231b9002efb94444e2871c8' as 'xpa'
Diffstat (limited to 'xpa/man/man3/xpainfonew.3')
-rw-r--r-- | xpa/man/man3/xpainfonew.3 | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/xpa/man/man3/xpainfonew.3 b/xpa/man/man3/xpainfonew.3 new file mode 100644 index 0000000..bab9739 --- /dev/null +++ b/xpa/man/man3/xpainfonew.3 @@ -0,0 +1,195 @@ +.\" 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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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 |