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|ID||Category||Severity||Type||Date Submitted||Last Update|
|0001159||[1003.1(2016)/Issue7+TC2] Shell and Utilities||Editorial||Clarification Requested||2017-08-16 16:20||2019-04-17 09:39|
|Priority||normal||Resolution||Accepted As Marked|
|Final Accepted Text||See Note: 0004216|
|Summary||0001159: Is termination after receipt of SIGINT in dd(1) an error?|
When dd(1) receives SIGINT it shall "interrupt its current processing, write status information to standard error, and exit as though terminated by SIGINT."
Does "exit as though terminated by SIGINT" imply effecting the default behavior as described in §2.4.3, i.e. restoring the default behavior for SIGINT and resignaling itself? Or will any nonzero status code suffice? Or is it not an error case at all, i.e. it should provide status 0 upon exit?
|Desired Action||Clarify whether receipt of SIGINT in dd(1) is an error, and if so whether or not it should exit with the same status it would under the default signal handler.|
edited on: 2019-01-21 16:59
The standard clearly states that dd shall terminate abnormally as if by SIGINT, and conforming implementations must conform to this.
Being able to use a 'trap' handler to cater to an abnormal termination of dd in a long-running script is a useful behavior. Additionally, the standard should allow for existing practice of some implementations providing a way to get ongoing status reports from dd without terminating the process.
Notes to the Editor (not part of this interpretation):
At line 86094 (ASYNCHRONOUS EVENTS), change:
For SIGINT, the dd utility shall interrupt its current processing, write status information to standard error, and exit as though terminated by SIGINT. It shall take the standard action for all other signals; see the ASYNCHRONOUS EVENTS section in Section 1.4 (on page 2336).to:
For SIGINT, the dd utility shall interrupt its current processing, write status information to standard error, and terminate abnormally as if by the default action for SIGINT. One or more implementation defined non-job-control signals other than SIGABRT, SIGHUP, and SIGTERM may write status information to standard error and continue processing. All other signals (including job control signals, SIGABRT, SIGHUP, and SIGTERM) shall take their default action; see the ASYNCHRONOUS EVENTS section in Section 1.4 (on page 2336).
At line 86205 FUTURE DIRECTIONS, change:
A future version of this standard may introduce the SIGINFO signal; on platforms where such a signal is available, it is recommended that this signal be used for reporting status without terminating the process.
|Looks like the Interp Status field was mistakenly set to "Proposed" when this bug was resolved. Setting it to "Pending".|
|2017-08-16 16:20||scottcheloha||New Issue|
|2017-08-16 16:20||scottcheloha||Status||New => Under Review|
|2017-08-16 16:20||scottcheloha||Assigned To||=> ajosey|
|2017-08-16 16:20||scottcheloha||Name||=> Scott Cheloha|
|2017-08-16 16:20||scottcheloha||Section||=> dd(1)|
|2017-08-16 16:20||scottcheloha||Page Number||=> --|
|2017-08-16 16:20||scottcheloha||Line Number||=> --|
|2017-08-16 16:21||scottcheloha||Summary||Is termination after receipt of SIGINT an error? => Is termination after receipt of SIGINT in dd(1) an error?|
|2019-01-14 15:42||nick||Page Number||-- => 2646|
|2019-01-14 15:42||nick||Line Number||-- => 86094-86096|
|2019-01-14 15:42||nick||Interp Status||=> ---|
|2019-01-17 15:55||geoffclare||Project||1003.1(2008)/Issue 7 => 1003.1(2016)/Issue7+TC2|
|2019-01-21 16:51||eblake||Note Added: 0004216|
|2019-01-21 16:52||eblake||Interp Status||--- => Proposed|
|2019-01-21 16:52||eblake||Final Accepted Text||=> See bugnote#4216|
|2019-01-21 16:52||eblake||Status||Under Review => Interpretation Required|
|2019-01-21 16:52||eblake||Resolution||Open => Accepted As Marked|
|2019-01-21 16:53||eblake||Final Accepted Text||See bugnote#4216 => See Note: 0004216|
|2019-01-21 16:59||Don Cragun||Note Edited: 0004216|
|2019-01-21 17:05||Don Cragun||Tag Attached: tc3-2008|
|2019-04-17 09:39||geoffclare||Interp Status||Proposed => Pending|
|2019-04-17 09:39||geoffclare||Note Added: 0004365|
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