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| ID | Category | Severity | Type | Date Submitted | Last Update | ||
| 0000370 | [1003.1(2008)/Issue 7] System Interfaces | Objection | Error | 2011-01-13 16:48 | 2020-02-14 15:38 | ||
| Reporter | eblake | View Status | public | ||||
| Assigned To | ajosey | ||||||
| Priority | normal | Resolution | Accepted As Marked | ||||
| Status | Applied | ||||||
| Name | Eric Blake | ||||||
| Organization | Red Hat | ||||||
| User Reference | ebb.posix_spawn | ||||||
| Section | posix_spawn_file_actions_addclose | ||||||
| Page Number | 1430 | ||||||
| Line Number | 46882 | ||||||
| Interp Status | Approved | ||||||
| Final Accepted Text | See Note: 0000718 | ||||||
| Summary | 0000370: addclose should not cause posix_spawn to fail if closing an already closed fd | ||||||
| Description |
Right now, the standard requires posix_spawn to fail if any action registered by posix_spawn_file_actions fails. However, in the case of close() on an already closed file descriptor, this is unintentionally harsh. The problem can be worked around by using adddup2 prior to addclose to ensure that the close will be on a valid file descriptor, but this adds extra work. |
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| Desired Action |
At line 46673 [XSH posix_spawn], change: fails for any of the reasons that would cause close( ), dup2( ), or open( ) to fail, an error value shall be returned to: fails for any of the reasons that would cause close( ), dup2( ), or open( ) to fail, other than attempting a close( ) on a file descriptor that is in range but already closed, an error value shall be returned At line 46880 [XSH posix_spawn_file_actions_add_close], change: The posix_spawn_file_actions_addclose( ) function shall add a close action to the object referenced by file_actions that shall cause the file descriptor fildes to be closed (as if close(fildes) had been called) when a new process is spawned using this file actions object. to: The posix_spawn_file_actions_addclose( ) function shall add a close action to the object referenced by file_actions that shall cause the file descriptor fildes to be closed (as if close(fildes) had been called) when a new process is spawned using this file actions object, except that a nonnegative filedes less than OPEN_MAX that is already closed at the time when the new process is spawned shall be ignored rather than failing with EBADF. |
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| Tags | issue8 | ||||||
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Notes |
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(0000718) Don Cragun (manager) 2011-03-24 15:16 edited on: 2011-04-28 15:34 |
Interpretation response ------------------------ The standard states that posix_spawn() must fail with an EBADF error if a request is made to close a file descriptor that is already closed, and conforming implementations must conform to this. However, concerns have been raised about this which are being referred to the sponsor. Rationale: ------------- There are existing implementations that behave this way and there is no reason why this should be disallowed. Notes to the Editor (not part of this interpretation): ------------------------------------------------------- Make the changes presented in the Desired Action section plus the changes suggested in Note: 0000745. |
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(0000724) ajosey (manager) 2011-03-25 05:51 |
This proposed interpretation is being circulated for a 30 day review |
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(0000745) eblake (manager) 2011-04-20 15:03 |
An additional change is required: At line 123287 [XRAT B.3.3 Examples for Spawn], change: if (close(fd) == -1) to: if (close(fd) == -1 && errno != EBADF) |
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(0000779) ajosey (manager) 2011-05-05 20:09 |
The interpretation is now approved. |
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Issue History |
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| Date Modified | Username | Field | Change |
| 2011-01-13 16:48 | eblake | New Issue | |
| 2011-01-13 16:48 | eblake | Status | New => Under Review |
| 2011-01-13 16:48 | eblake | Assigned To | => ajosey |
| 2011-01-13 16:48 | eblake | Name | => Eric Blake |
| 2011-01-13 16:48 | eblake | Organization | => Red Hat |
| 2011-01-13 16:48 | eblake | User Reference | => ebb.posix_spawn |
| 2011-01-13 16:48 | eblake | Section | => posix_spawn_file_actions_addclose |
| 2011-01-13 16:48 | eblake | Page Number | => 1430 |
| 2011-01-13 16:48 | eblake | Line Number | => 46882 |
| 2011-01-13 16:48 | eblake | Interp Status | => --- |
| 2011-01-13 17:04 | Don Cragun | Status | Under Review => Resolved |
| 2011-01-13 17:04 | Don Cragun | Resolution | Open => Accepted |
| 2011-01-13 17:04 | Don Cragun | Tag Attached: issue8 | |
| 2011-01-13 17:05 | Don Cragun | Relationship added | related to 0000149 |
| 2011-03-24 15:16 | Don Cragun | Interp Status | --- => Pending |
| 2011-03-24 15:16 | Don Cragun | Note Added: 0000718 | |
| 2011-03-24 15:16 | Don Cragun | Status | Resolved => Interpretation Required |
| 2011-03-24 15:17 | Don Cragun | Final Accepted Text | => See Note: 0000718 |
| 2011-03-25 05:51 | ajosey | Interp Status | Pending => Proposed |
| 2011-03-25 05:51 | ajosey | Note Added: 0000724 | |
| 2011-04-20 15:03 | eblake | Note Added: 0000745 | |
| 2011-04-28 15:34 | Don Cragun | Note Edited: 0000718 | |
| 2011-04-28 15:34 | Don Cragun | Resolution | Accepted => Accepted As Marked |
| 2011-05-05 20:09 | ajosey | Interp Status | Proposed => Approved |
| 2011-05-05 20:09 | ajosey | Note Added: 0000779 | |
| 2011-06-02 16:10 | eblake | Relationship added | related to 0000418 |
| 2020-02-14 15:38 | geoffclare | Status | Interpretation Required => Applied |
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