View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000460 | 1003.1(2008)/Issue 7 | System Interfaces | public | 2011-06-07 20:03 | 2013-04-16 13:06 |
| Reporter | eblake | Assigned To | ajosey | ||
| Priority | normal | Severity | Objection | Type | Error |
| Status | Closed | Resolution | Accepted | ||
| Name | Eric Blake | ||||
| Organization | Red Hat | ||||
| User Reference | ebb.getopt | ||||
| Section | getopt | ||||
| Page Number | 1041 | ||||
| Line Number | 34860 | ||||
| Interp Status | Approved | ||||
| Final Accepted Text | See 0000460:0000859 | ||||
| Summary | 0000460: detecting stderr write failures during getopt, wordexp | ||||
| Description | Both the getopt() and wordexp() commands are documented as writing error messages to stderr under certain conditions, yet neither function defines the state of the error flag on the stderr stream or the state of errno after such failures. However, these functions are rather high level, and there are probably existing implementations that do not guarantee that errno is unchanged on success; furthermore, in the wordexp case, the output to stderr is often done by a child process and thus does not reflect a write failure back to the parent process. | ||||
| Desired Action | At line 34860 [XSH getopt ERRORS], change "No errors are defined" to: If the application has not set the variable opterr to 0, the first character of optstring is not a <colon>, and a write error occurs while getopt( ) is printing a diagnostic message to stderr, then the error indicator for stderr shall be set; but getopt( ) shall still succeed and the value of errno after getopt( ) is unspecified. At line 34980 [XSH getopt APPLICATION USAGE], add a new paragraph: While ferror(stderr) may be used to detect failures to write a diagnostic to stderr when getopt( ) returns '?', the value of errno is unspecified in such a condition. Applications desiring more control over handling write failures should set opterr to 0 and independently perform output to stderr, rather than relying on getopt( ) to do the output. At line 71005 [XSH wordexp DESCRIPTION], change: If WRDE_SHOWERR is set, wordexp( ) may write messages to stderr if syntax errors are detected while expanding words. to: If WRDE_SHOWERR is set, wordexp( ) may write messages to stderr if syntax errors are detected while expanding words; however, it is unspecified whether any write errors encountered while outputting such messages will affect the stderr error indicator or the value of errno. At line 71038 [XSH wordexp APPLICATION USAGE], add a paragraph: Even though the WRDE_SHOWERR flag allows the implementation to write messages to stderr during command substitution or syntax errors, the standard does not provide any way to detect write failures during the output of such messages. | ||||
| Tags | tc1-2008 | ||||
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Interpretation response ------------------------ The standard does not speak to this issue, and as such no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor. Rationale: ------------- None Notes to the Editor (not part of this interpretation): ------------------------------------------------------- See Desired Action |
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Interpretation proposed 10 August 2011 for final 30 day review |
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Interpretation approved 12 Sept 2011 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2011-06-07 20:03 | eblake | New Issue | |
| 2011-06-07 20:03 | eblake | Status | New => Under Review |
| 2011-06-07 20:03 | eblake | Assigned To | => ajosey |
| 2011-06-07 20:03 | eblake | Name | => Eric Blake |
| 2011-06-07 20:03 | eblake | Organization | => Red Hat |
| 2011-06-07 20:03 | eblake | User Reference | => ebb.getopt |
| 2011-06-07 20:03 | eblake | Section | => getopt |
| 2011-06-07 20:03 | eblake | Page Number | => 1041 |
| 2011-06-07 20:03 | eblake | Line Number | => 34860 |
| 2011-06-07 20:03 | eblake | Interp Status | => --- |
| 2011-06-16 15:34 | nick | Interp Status | --- => Pending |
| 2011-06-16 15:34 | nick | Note Added: 0000859 | |
| 2011-06-16 15:34 | nick | Status | Under Review => Interpretation Required |
| 2011-06-16 15:34 | nick | Resolution | Open => Accepted |
| 2011-06-16 15:35 | nick | Tag Attached: tc1-2008 | |
| 2011-06-16 15:35 | nick | Final Accepted Text | => See 0000460:0000859 |
| 2011-08-10 15:23 | ajosey | Interp Status | Pending => Proposed |
| 2011-08-10 15:23 | ajosey | Note Added: 0000929 | |
| 2011-09-12 15:22 | ajosey | Interp Status | Proposed => Approved |
| 2011-09-12 15:22 | ajosey | Note Added: 0000961 | |
| 2013-04-16 13:06 | ajosey | Status | Interpretation Required => Closed |
