looks like OpenBSD is missing this patch from FreeBSD? llvm libc++ hit
this (a test worked on other OSes, including FreeBSD-based macOS) but
failed on OpenBSD-based Android.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=127335 was the
original FreeBSD bug report. POSIX seems to explicitly require this
behavior
(https://pubs.opengroup.org/onlinepubs/9699919799/functions/fwrite.html:
"The fwrite() function shall return the number of elements
successfully written, which may be less than nitems if a write error
is encountered. If size or nitems is 0, fwrite() shall return 0 and
the state of the stream remains unchanged. Otherwise, if a write error
occurs, the error indicator for the stream shall be set, and errno
shall be set to indicate the error.").
i'm assuming, given that there's already a patch in FreeBSD and it
would make more sense to reference that, that there's no point in me
sending a "new" patch :-)
~/freebsd$ git show 0cab1fd2369c9
commit 0cab1fd2369c938361ed93befa9191632ef91e2d
Author: David Schultz <d...@freebsd.org>
Date: Thu Jan 8 06:38:06 2009 +0000
Set the error indicator on an attempt to write to a read-only stream.
PR: 127335
MFC after: 2 weeks
diff --git a/lib/libc/stdio/wsetup.c b/lib/libc/stdio/wsetup.c
index a5da23f003ec..37bfc58bc360 100644
--- a/lib/libc/stdio/wsetup.c
+++ b/lib/libc/stdio/wsetup.c
@@ -60,6 +60,7 @@ __swsetup(fp)
if ((fp->_flags & __SWR) == 0) {
if ((fp->_flags & __SRW) == 0) {
errno = EBADF;
+ fp->_flags |= __SERR;
return (EOF);
}
if (fp->_flags & __SRD) {
~/freebsd$
