[PULL 11/25] osdep.h: Always include <sys/signal.h> if it exists

[Peter Maydell <peter.maydell@linaro.org>]

From: David CARLIER <devnexen@gmail.com>

Regularize our handling of <sys/signal.h>: currently we include it in
osdep.h, but only for OpenBSD, and we include it without an ifdef
guard in a couple of C files.  This causes problems for Haiku, which
doesn't have that header.

Instead, check in configure whether sys/signal.h exists, and if it
does then always include it from osdep.h.

Signed-off-by: David Carlier <devnexen@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200703145614.16684-5-peter.maydell@linaro.org
[PMM: Expanded commit message; rename to HAVE_SYS_SIGNAL_H]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 configure                   | 10 ++++++++++
 include/qemu/osdep.h        |  2 +-
 hw/xen/xen-legacy-backend.c |  1 -
 util/oslib-posix.c          |  1 -
 4 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 429c938708e..bc3b9ad9317 100755
--- a/configure
+++ b/configure
@@ -3244,6 +3244,13 @@ if check_include "libdrm/drm.h" ; then
     have_drm_h=yes
 fi
 
+#########################################
+# sys/signal.h check
+have_sys_signal_h=no
+if check_include "sys/signal.h" ; then
+  have_sys_signal_h=yes
+fi
+
 ##########################################
 # VTE probe
 
@@ -7433,6 +7440,9 @@ fi
 if test "$have_openpty" = "yes" ; then
     echo "HAVE_OPENPTY=y" >> $config_host_mak
 fi
+if test "$have_sys_signal_h" = "yes" ; then
+    echo "HAVE_SYS_SIGNAL_H=y" >> $config_host_mak
+fi
 
 # Work around a system header bug with some kernel/XFS header
 # versions where they both try to define 'struct fsxattr':
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 0fc206ae615..14059bce5a7 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -104,7 +104,7 @@ extern int daemon(int, int);
 #include <setjmp.h>
 #include <signal.h>
 
-#ifdef __OpenBSD__
+#ifdef HAVE_SYS_SIGNAL_H
 #include <sys/signal.h>
 #endif
 
diff --git a/hw/xen/xen-legacy-backend.c b/hw/xen/xen-legacy-backend.c
index 083d8dc1b28..b61a4855b7b 100644
--- a/hw/xen/xen-legacy-backend.c
+++ b/hw/xen/xen-legacy-backend.c
@@ -23,7 +23,6 @@
  */
 
 #include "qemu/osdep.h"
-#include <sys/signal.h>
 
 #include "hw/sysbus.h"
 #include "hw/boards.h"
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 39ddc77c85b..7ad9195c445 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -38,7 +38,6 @@
 #include "qemu/sockets.h"
 #include "qemu/thread.h"
 #include <libgen.h>
-#include <sys/signal.h>
 #include "qemu/cutils.h"
 
 #ifdef CONFIG_LINUX
-- 
2.20.1