osdep.h: Always include <sys/signal.h> if it exists

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>

1 files changed, 10 insertions, 0 deletions

diff --git a/configure b/configure
index 429c938708..bc3b9ad931 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':