74 lines
2.8 KiB
HTML
74 lines
2.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=iso-8859-1">
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<title>EPICS Base R3.16.0 Release Notes</title>
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</head>
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<body lang="en">
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<h1 align="center">EPICS Base Release 3.16.0</h1>
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<p style="color:red">This version of EPICS Base has not been released yet.</p>
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<h2 align="center">Changes between 3.15.x and 3.16.0</h2>
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<!-- Insert new items immediately below this template ...
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<h3>Title...</h3>
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<p>Description</p>
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-->
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<h3>Generate Version Header</h3>
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<p>A Perl script and Makefile rules have been added to allow modules to generate
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a C header file with a macro defined with an automatically updated identifier.
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This is a VCS revision ID (Darcs, Git, Mercurial Subversion and Bazaar are all
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supported) or the date/time of the build if no VCS system is in use.</p>
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<p>The makeBaseApp example template has been updated with a new device support
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which makes this identifier visible via a lsi (long string input) record.</p>
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<h3>epicsTime API return status</h3>
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<p>The epicsTime routines that used to return epicsTimeERROR now return a specific
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S_time_ status value, allowing the caller to discover the reason for any failure.
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The identifier <tt>epicsTimeERROR</tt> is no longer defined, so any references to
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it in source code will no longer compile. The identifier epicsTimeOK still exists
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and has the value 0 as before, so most code that uses these APIs can be changed in
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a way that is backwards-compatible with the previous return status.</p>
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<p>Time providers that have to return a status value and still need to be built
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with earlier versions of Base can define the necessary status symbols like this:</p>
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<blockquote><pre>
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#include "epicsTime.h"
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#ifndef M_time
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/* S_time_... status values were not provided before Base 3.16 */
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#define S_time_unsynchronized epicsTimeERROR
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#define S_time_...whatever... epicsTimeERROR
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#endif
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</pre></blockquote>
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<h3>Refactoring of epicsReadline</h3>
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<p>The epicsReadline code has been reorganized to allow the commandline history
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editor to be disabled at runtime. The EPICS_COMMANDLINE_LIBRARY build setting
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still selects the preferred editor, but the new <tt>IOCSH_HISTEDIT_DISABLE</tt>
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environment variable can be set at runtime to disable history editing and make
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the IOC or other program use the basic editor instead. This is useful when
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starting and controlling an IOC from another program through its stdin and
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stdout streams since history editors often insert invisible escape codes into
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the stdout stream, making it hard to parse.</p>
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<h3>Callback subsystem API</h3>
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<p>Added a new macro <tt>callbackGetPriority(prio, callback)</tt> to the
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callback.h header and removed the need for dbScan.c to reach into the internals
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of its CALLBACK objects.</p>
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</body>
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</html>
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