Bug 619664
| Summary: | [CentOS 5.5] select()'s timeout breaks POSIX spec | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Sam Trenholme <strenholme.usenet> |
| Component: | kernel | Assignee: | Red Hat Kernel Manager <kernel-mgr> |
| Status: | CLOSED WORKSFORME | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 5.5 | ||
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-02-27 11:30:30 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: | |||
Originally submitted at http://bugs.centos.org/view.php?id=4465 and instructed to go upstream. So, here I am. Upstream means going to the linux-kernel mailing list - Red Hat is not upstream for this. Please try the mailing list. For what it is worth, this bug has been fixed in CentOS 5.9. Closing as "works for me" |
Description of problem: The select() system call takes twice as long to timeout as it should. Version-Release number of selected component (if applicable): CentOS 5.5 (regression; CentOS 5.4 is fine) How reproducible: Always reproducible. Steps to Reproduce: 1. cat > select.delay.c << EOF /* Tiny program to show CentOS 5.5 bug. Public domain */ #include <sys/select.h> #include <stdio.h> main() { struct timeval tv; tv.tv_sec = 1; tv.tv_usec = 0; select(0,NULL,NULL,NULL,&tv); return 0; } EOF 2. cc -o select.delay select.delay.c 3. time ./select.delay Actual results: Numbers along these lines: real 0m2.002s user 0m0.000s sys 0m0.005s Expected results: Numbers like this: real 0m1.098s user 0m0.000s sys 0m0.000s Additional info: This is a bug because the POSIX specification for "select()" at http://www.opengroup.org/onlinepubs/000095399/functions/select.html states that "the timeout period is given in seconds and microseconds" and the POSIX specification for "time.h" at http://www.opengroup.org/onlinepubs/009695399/basedefs/time.h.html points out the tv_sec is seconds, e.g. "time_t tv_sec Seconds".