https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212048
Bug ID: 212048
Summary: waitpid returns uninitialized status when WNOHANG
option is used
Product: Base System
Version: 10.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: caseylu...@gmail.com
When the WNOHANG option is used with waitpid, uninitialized memory is returned
in the 'status' result if no child process is available. This was first
noticed when the return value from Python os.waitpid was trashed / unreliable.
See 'status' variable in kern_exit.c::sys_wait4
Demonstration of problem:
https://gist.github.com/caseylucas/df2eea85741ea892328c3f8c558cfa75
Stackoverflow reference:
http://stackoverflow.com/questions/38984449/is-status-value-from-os-waitpid-unreliable-when-os-wnohang-is-used-under-freebsd
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