Bug 507054
| Summary: | fsetpos/fseek broken for wide-oriented streams | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Watanabe, Yuki <magicant.starmen> | ||||
| Component: | glibc | Assignee: | Andreas Schwab <schwab> | ||||
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | low | ||||||
| Version: | 11 | CC: | drepper, jakub, pmuller, schwab | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2009-09-07 13:36:49 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 516995 | ||||||
| Attachments: |
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The bug seems to be connected with this old change, but reverting it breaks other tests. 2002-11-04 Ulrich Drepper <drepper> * libio/wfileops.c (_IO_wfile_seekoff): Don't modify _offset and _wide_data->_IO_read_end if adjustment can be made in the current buffer. Looks like the equivalent of this change has never been applied to wfileops.c:
2004-12-06 Ulrich Drepper <drepper>
* libio/fileops.c (_IO_new_file_seekoff): Fix optimization of in-buffer
seek. Remove dead code.
Fixed in 2.10.90-20. |
Created attachment 348738 [details] a test case Description of problem: The fsetpos and fseek functions does not work for wide-oriented streams. They leave the file position at the wrong place or cause a segfault. Version-Release number of selected component (if applicable): glibc-2.10.1-2 (i686) How reproducible: Sometimes. Steps to Reproduce: Compile and run the attached test case. Actual output of the test case: 1 2 1 1 Expected output of the test case: 1 2 1 3 Additional info: The fflush function seems to affect the behaviour fsetpos. Doing fflush just before fsetpos sometimes makes fsetpos work correctly, but it does not always help.