svn commit: r297297 - head/sys/compat/linux

[Dmitry Chagin]

Author: dchagin
Date: Sat Mar 26 19:16:53 2016
New Revision: 297297
URL: https://svnweb.freebsd.org/changeset/base/297297

Log:
  When write(2) on eventfd object fails with the error EAGAIN do not return
  the number of bytes written.
  
  MFC after:	1 week

Modified:
  head/sys/compat/linux/linux_event.c

Modified: head/sys/compat/linux/linux_event.c
==============================================================================
--- head/sys/compat/linux/linux_event.c	Sat Mar 26 19:15:23 2016	(r297296)
+++ head/sys/compat/linux/linux_event.c	Sat Mar 26 19:16:53 2016	(r297297)
@@ -751,6 +751,8 @@ retry:
 	if (UINT64_MAX - efd->efd_count <= count) {
 		if ((efd->efd_flags & LINUX_O_NONBLOCK) != 0) {
 			mtx_unlock(&efd->efd_lock);
+			/* Do not not return the number of bytes written */
+			uio->uio_resid += sizeof(eventfd_t);
 			return (EAGAIN);
 		}
 		error = mtx_sleep(&efd->efd_count, &efd->efd_lock,