https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280809
Bug ID: 280809
Summary: jail_attach(2) fails to document reason for EPERM
Product: Documentation
Version: Latest
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: Manual Pages
Assignee: b...@freebsd.org
Reporter: karlo9...@gmail.com
CC: d...@freebsd.org
Created attachment 252746
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=252746&action=edit
Documents this behavior in lib/libc/sys/jail.2
In jail_attach(2) the only reason listed for EPERM is if the user not root
while attempting to attach to a jail.
Running into that errno in my program I was puzzled because uid was 0 - so that
could not have been the problem.
After help from other people I found out that there might be other,
undocumented, reasons for getting that errno.
Specifically, the issue was that the process was holding a directory FD open
while trying to attach, which is prohibited.
A sentence describing this behavior should be added to "[EPERM]" in
jail_attach(2) "ERRORS" section.
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