https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196666
Bug ID: 196666
Summary: write(2) maximum I/O size too small / inadequately
documented in man page
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: ema...@freebsd.org
write(2) claims at most INT_MAX bytes may be written at once, and EINVAL is
returned upon an attempt to exceed this:
[EINVAL] The value nbytes is greater than INT_MAX.
The limit depends on the debug.iosize_max_clamp:
joule% sysctl -d debug.iosize_max_clamp
debug.iosize_max_clamp: Clamp max i/o size to INT_MAX
in 11-CURRENT this defaults to 0 so the limit is actually SSIZE_MAX, as POSIX
wants, and the man page is correct
in 10-STABLE it defaults to 1 so the man page is correct but the limit is too
small
See also https://sourceforge.net/p/elftoolchain/tickets/478/ for the sort of
issue probably caused by this
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