Date: Wed, 07 Jan 2026 20:10:08 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 292255] pdgetpid wrongly succeeds for processes that have already been waited Message-ID: <bug-292255-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292255 Bug ID: 292255 Summary: pdgetpid wrongly succeeds for processes that have already been waited Product: Base System Version: 16.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org pdgetpid(2) can lookup the pid corresponding to a particular process descriptor. A common use case is to wait on a child, since there is no such thing as pdwait4(). When using a function like waitpid(pid, ..., WEXITED), it is very important not to call it twice for the same pid. Doing so could lead to inadvertently waiting on an unrelated process after the desired process has exited. In its current form, pdgetpid() will still return the original pid, even after the child has died and been waited upon. That's a bug, IMHO, because it can lead to users calling waitpid() on the same pid twice. IMHO, pdgetpid should return ESRCH in this case. See the attached file for an ATF test case that demonstrates the problem. -- You are receiving this mail because: You are the assignee for the bug.home | help
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