https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252551
Bug ID: 252551
Summary: POSIX compliance: writev does not return EINVAL when
iovcnt == 0
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: asom...@freebsd.org
POSIX requires that readv and writev return EINVAL when iovcnt == 0. Our own
man pages document that condition as well.
https://pubs.opengroup.org/onlinepubs/9699919799/functions/writev.html
https://pubs.opengroup.org/onlinepubs/9699919799/functions/readv.html
However, we accept iovcnt == 0, do nothing, and return 0. That's not
inherently unreasonable, but it's not POSIX-compliant. From inspection,
OpenBSD and NetBSD do not have this bug, but DragonflyBSD does.
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