A NOTE has been added to this issue. ====================================================================== http://austingroupbugs.net/view.php?id=1211 ====================================================================== Reported By: kre Assigned To: ====================================================================== Project: 1003.1(2016)/Issue7+TC2 Issue ID: 1211 Category: Shell and Utilities Type: Clarification Requested Severity: Objection Priority: normal Status: New Name: Robert Elz Organization: User Reference: Section: XCU 2.14 -- trap special builtin Page Number: 2420 Line Number: 77514 - 77526 Interp Status: --- Final Accepted Text: ====================================================================== Date Submitted: 2018-09-28 02:22 UTC Last Modified: 2019-04-04 16:36 UTC ====================================================================== Summary: "trap" (with no args) specification does not match reality ======================================================================
---------------------------------------------------------------------- (0004355) geoffclare (manager) - 2019-04-04 16:36 http://austingroupbugs.net/view.php?id=1211#c4355 ---------------------------------------------------------------------- Change the sentence starting on line 77514 from:<blockquote>The <i>trap</i> command with no operands shall write to standard output a list of commands associated with each condition.</blockquote>to:<blockquote>The <i>trap</i> command with no operands shall write to standard output a list of commands associated with each condition which is not in its default state.</blockquote> Change the sentence at line 77522 from:<blockquote>The shell shall format the output, including the proper use of quoting, so that it is suitable for reinput to the shell as commands that achieve the same trapping results.</blockquote>to:<blockquote>The shell shall format the output, including the proper use of quoting, so that it is suitable for reinput to the shell as commands that achieve the same trapping results for those traps that had previously been altered.</blockquote> And also change the example at lines 77524-6 from:<blockquote><pre>save_traps=$(trap) ... eval "$save_traps"</pre></blockquote>to:<blockquote><pre>save_traps=$(trap) trap "some command" INT QUIT save_traps="trap - INT QUIT; $save_traps" ... eval "$save_traps"</pre></blockquote> On page 2422 line 77564, change APPLICATION USAGE from:<blockquote>None.</blockquote>to:<blockquote>Since <i>trap</i> with no operands does not output commands to restore traps that are currently set to default, these need to be restored separately. The DESCRIPTION section shows one example, but the method it uses relies on hard-coding the commands to reset the traps that are being set. A more general approach would be:<pre> save_traps=$(trap) ... for sig in EXIT $( kill -l ) do case "$sig" in SIGKILL | KILL | sigkill | kill | SIGSTOP | STOP | sigstop | stop) ;; *) trap - $sig ;; esac done eval "$save_traps"</pre> However, this has a race condition since it first sets all traps (that can be set) to default and then restores those that were not previously set to default.</blockquote> On page 2423, line 77606 (FUTURE DIRECTIONS) change:<blockquote>None.</blockquote>to:<blockquote>A future version of this standard may define a mechanism to obtain the current setting of all traps (including those in their default state).</blockquote> Issue History Date Modified Username Field Change ====================================================================== 2018-09-28 02:22 kre New Issue 2018-09-28 02:22 kre Name => Robert Elz 2018-09-28 02:22 kre Section => XCU 2.14 -- trap special builtin 2018-09-28 02:22 kre Page Number => 2420 2018-09-28 02:22 kre Line Number => 77514 - 77526 2018-09-28 03:20 kre Tag Attached: tc3-2008 2018-09-28 03:20 kre Tag Attached: issue8 2018-09-28 03:20 kre Tag Detached: tc3-2008 2018-09-28 03:21 kre Tag Detached: issue8 2018-09-28 03:23 kre Note Added: 0004132 2018-09-28 08:44 geoffclare Note Added: 0004133 2018-09-28 08:53 geoffclare Note Added: 0004134 2018-09-28 09:04 geoffclare Note Edited: 0004133 2018-09-28 09:05 geoffclare Note Deleted: 0004134 2018-09-28 10:25 kre Note Added: 0004135 2018-09-28 10:40 kre Note Added: 0004136 2019-04-04 16:36 geoffclare Note Added: 0004355 ======================================================================
