[Qemu-devel] [PATCH 2/3] XXX oslib-posix: Ignore fcntl("/dev/null", F_SETFL, O_NONBLOCK) failure

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Previous to OpenBSD 6.3 [1], fcntl(F_SETFL) is not permitted on memory
devices. Do not assert fcntl failures on OpenBSD.
This fixes:

  $ lm32-softmmu/qemu-system-lm32
  assertion "f != -1" failed: file "util/oslib-posix.c", line 247, function "qemu_set_nonblock"
  Abort trap (core dumped)

[1] The fix seems https://github.com/openbsd/src/commit/c2a35b387f9d3c
  "fcntl(F_SETFL) invokes the FIONBIO and FIOASYNC ioctls internally, so
  the memory devices (/dev/null, /dev/zero, etc) need to permit them."

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 util/oslib-posix.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 4ce1ba9ca4..064c3ae2f7 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -244,7 +244,9 @@ void qemu_set_nonblock(int fd)
     f = fcntl(fd, F_GETFL);
     assert(f != -1);
     f = fcntl(fd, F_SETFL, f | O_NONBLOCK);
+#ifndef __OpenBSD__
     assert(f != -1);
+#endif
 }
 
 int socket_set_fast_reuse(int fd)
-- 
2.20.1