View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000750 | 1003.1(2013)/Issue7+TC1 | Shell and Utilities | public | 2013-09-17 11:18 | 2019-06-10 08:55 |
| Reporter | geoffclare | Assigned To | |||
| Priority | normal | Severity | Objection | Type | Error |
| Status | Closed | Resolution | Accepted | ||
| Name | Geoff Clare | ||||
| Organization | The Open Group | ||||
| User Reference | |||||
| Section | 2.11 | ||||
| Page Number | 2353 | ||||
| Line Number | 74957 | ||||
| Interp Status | Approved | ||||
| Final Accepted Text | See 0000750:0001858. | ||||
| Summary | 0000750: Async list handling of SIGINT and SIGQUIT depends on job control | ||||
| Description | In XCU6, the first paragraph of section 2.11 was: When a command is in an asynchronous list, the shell shall prevent SIGQUIT and SIGINT signals from the keyboard from interrupting the command. Otherwise, signals shall have the values inherited by the shell from its parent (see also the trap special built-in). This has since become: When a command is in an asynchronous list, it shall inherit from the shell a signal action of ignored (SIG_IGN) for the SIGQUIT and SIGINT signals, and may inherit a signal mask in which SIGQUIT and SIGINT are blocked. Otherwise, the signal actions and signal mask inherited by the command shall be the same as those inherited by the shell from its parent unless a signal action is modified by the trap special built-in (see trap). This new text is incorrect in the case when job control is enabled. With job control enabled, a background job that has been brought into the foreground using fg should respond to SIGINT and SIGQUIT in the same way as if it had been started in the foreground. (And this works in existing shells.) Also, the option to allow shells to block SIGINT and SIGQUIT was presumably included in the new text because this could theoretically be a way that a shell could comply with the XCU6 requirement. However, this seems like an unnecessary complication and I'm not aware of any shell implementations that do it. | ||||
| Desired Action | Change: When a command is in an asynchronous list, it shall inherit from the shell a signal action of ignored (SIG_IGN) for the SIGQUIT and SIGINT signals, and may inherit a signal mask in which SIGQUIT and SIGINT are blocked. Otherwise, the signal actions and signal mask inherited by the command shall be the same as ... to: If job control is disabled (see the description of set -m) when the shell executes an asynchronous list, the commands in the list shall inherit from the shell a signal action of ignored (SIG_IGN) for the SIGINT and SIGQUIT signals. In all other cases, commands executed by the shell shall inherit the same signal actions as ... | ||||
| Tags | tc2-2008 | ||||
| related to | 0000751 | Closed | Using trap to reset SIGINT/QUIT in an asynchronous subshell |
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Interpretation response ------------------------ The standard states that when job control is enabled SIGINT and SIGQUIT signals must be ignored by commnds in an asynchronous list, and conforming implementations must conform to this. However, concerns have been raised about this which are being referred to the sponsor. Rationale: ------------- This is not the expected behavior when job control is enabled in the shell. Notes to the Editor (not part of this interpretation): ------------------------------------------------------- Make the changes suggested in the Desired Action. |
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Interpretation Proposed 21 Feb 2014 |
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Interpretation Approved: 25 March 2014 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-09-17 11:18 | geoffclare | New Issue | |
| 2013-09-17 11:18 | geoffclare | Name | => Geoff Clare |
| 2013-09-17 11:18 | geoffclare | Organization | => The Open Group |
| 2013-09-17 11:18 | geoffclare | Section | => 2.11 |
| 2013-09-17 11:18 | geoffclare | Page Number | => 2353 |
| 2013-09-17 11:18 | geoffclare | Line Number | => 74957 |
| 2013-09-17 11:18 | geoffclare | Interp Status | => --- |
| 2013-09-17 15:11 | geoffclare | Relationship added | related to 0000751 |
| 2013-10-03 16:11 | Don Cragun | Interp Status | --- => Pending |
| 2013-10-03 16:11 | Don Cragun | Note Added: 0001858 | |
| 2013-10-03 16:11 | Don Cragun | Status | New => Interpretation Required |
| 2013-10-03 16:11 | Don Cragun | Resolution | Open => Accepted |
| 2013-10-03 16:12 | Don Cragun | Final Accepted Text | => See 0000750:0001858. |
| 2013-10-03 16:12 | Don Cragun | Tag Attached: tc2-2008 | |
| 2014-02-21 15:40 | ajosey | Interp Status | Pending => Proposed |
| 2014-02-21 15:40 | ajosey | Note Added: 0002157 | |
| 2014-03-25 13:43 | ajosey | Interp Status | Proposed => Approved |
| 2014-03-25 13:43 | ajosey | Note Added: 0002206 | |
| 2019-06-10 08:55 | agadmin | Status | Interpretation Required => Closed |
