View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000676 | 1003.1(2013)/Issue7+TC1 | System Interfaces | public | 2013-04-08 04:57 | 2019-06-10 08:55 |
| Reporter | philip-guenther | Assigned To | ajosey | ||
| Priority | normal | Severity | Editorial | Type | Clarification Requested |
| Status | Closed | Resolution | Accepted As Marked | ||
| Name | Philip Guenther | ||||
| Organization | OpenBSD | ||||
| User Reference | |||||
| Section | pread(), pwrite() | ||||
| Page Number | 1754,2288 | ||||
| Line Number | 56422,72479 | ||||
| Interp Status | --- | ||||
| Final Accepted Text | See 0000676:0001543. | ||||
| Summary | 0000676: description of pread()/pwrite() on tty or socket inconsistent | ||||
| Description | The description of pread() says: An attempt to perform a pread() on a file that is incapable of seeking shall result in an error. The ERRORS sections then says this: [ESPIPE] fildes is associated with a pipe or FIFO. ...but no error is given for using pread() on a socket or tty. Testing indicates that Solaris 10 and FreeBSD 8.2 treat using pread() on a tty the same as doing a read() on it. For sockets, Solaris 10 treats pread() like read(), while FreeBSD fails with ESPIPE. Linux 2.6.18 (RHEL 5.8) and OpenBSD 5.3 fail with ESPIPE for both ttys and sockets. While the pwrite() DESCRIPTION doesn't make a statement about failing on unseekable file type, it does fail to describe ESPIPE as applying in the socket and tty cases. The four platforms tested (Solaris, FreeBSD, Linux, and OpenBSD) have the same behavior with pwrite() as they do with pread(). | ||||
| Desired Action | My inclination is that given the description and the underlying reason for using pread(), it should be required to fail with ESPIPE for these, but I can understand a decision to make it a "may fail" instead. If the former, then change: [ESPIPE] fildes is associated with a pipe or FIFO. to [ESPIPE] fildes is associated with a pipe, FIFO, socket, or tty. Otherwise, if the "may fail" route is chosen, then change this: An attempt to perform a pread() on a file that is incapable of seeking shall result in an error. to (something like) this: An attempt to perform a pread() on a pipe or FIFO shall result in an error; an attempt to perform a pread() on other types of files that are incapable of seeking may result in an error. and add to ERRORS: The pread() function may fail, and the file pointer shall remain unchanged, if: [ESPIPE] fildes is associated with a socket or tty. And then, either way, the same changes should be made to the write()/pwrite() page. | ||||
| Tags | tc2-2008 | ||||
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It appears that this largely duplicates bugs 0000215 and 0000218, which were applied in TC1. |
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Yeah, the socket aspects were covered by those bugs; my apologies for the duplication. The tty aspects do still appear to apply, at least in my check of the preview of the 2013 HTML version (yay!) that was just posted. Another tweak to make if the pread/pwrite of tty case is made a "shall fail" error: the [EIO] errors that are specific to a background process accessing its controlling terminal should be moved into the part of the ERRORS section which is specific to the read() or write() function. |
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Change the ESPIPE error condition description for pread() on P1754, L56422 from:The file is a pipe, FIFO, or socket. to: The file is incapable of seeking. Make the same change to the ESPIPE error condition description for pwrite() on P2288, L72479. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-04-08 04:57 | philip-guenther | New Issue | |
| 2013-04-08 04:57 | philip-guenther | Status | New => Under Review |
| 2013-04-08 04:57 | philip-guenther | Assigned To | => ajosey |
| 2013-04-08 04:57 | philip-guenther | Name | => Philip Guenther |
| 2013-04-08 04:57 | philip-guenther | Organization | => OpenBSD |
| 2013-04-08 04:57 | philip-guenther | Section | => pread |
| 2013-04-08 04:57 | philip-guenther | Page Number | => 1739 |
| 2013-04-08 04:57 | philip-guenther | Line Number | => 55479-55480,55525 |
| 2013-04-08 08:48 | geoffclare | Note Added: 0001536 | |
| 2013-04-08 16:23 | philip-guenther | Note Added: 0001537 | |
| 2013-04-18 16:00 | Don Cragun | Project | 1003.1(2008)/Issue 7 => 1003.1(2013)/Issue7+TC1 |
| 2013-04-21 00:23 | Don Cragun | Page Number | 1739 => 1754,2288 |
| 2013-04-21 00:23 | Don Cragun | Line Number | 55479-55480,55525 => 56422,72479 |
| 2013-04-21 00:23 | Don Cragun | Interp Status | => --- |
| 2013-04-21 00:23 | Don Cragun | Note Added: 0001543 | |
| 2013-04-21 00:27 | Don Cragun | Note Edited: 0001543 | |
| 2013-04-21 00:27 | Don Cragun | Section | pread => pread(), pwrite() |
| 2013-04-25 15:51 | Don Cragun | Final Accepted Text | => See 0000676:0001543. |
| 2013-04-25 15:51 | Don Cragun | Status | Under Review => Resolved |
| 2013-04-25 15:51 | Don Cragun | Resolution | Open => Accepted As Marked |
| 2013-04-25 15:52 | Don Cragun | Tag Attached: tc2-2008 | |
| 2019-06-10 08:55 | agadmin | Status | Resolved => Closed |
