commit dcc38d1cce61e7d986e74dcd9bff2a5efc53a87c
author Marcelo Tosatti <mtosatti@redhat.com> Mon Oct 11 15:31:15 2010 -0300
committer Anthony Liguori <aliguori@us.ibm.com> Wed Oct 20 16:15:04 2010 -0500
tree 0dd5b5afae1590c6763858314b91fcf788d11c84
parent 296acb643b0f7ec3ab3d8c4a8fc48039d9269818

signalfd compatibility

Port qemu-kvm's signalfd compat code.

commit 5a7fdd0abd7cd24dac205317a4195446ab8748b5
Author: Anthony Liguori <aliguori@us.ibm.com>
Date:   Wed May 7 11:55:47 2008 -0500

    Use signalfd() in io-thread

    This patch reworks the IO thread to use signalfd() instead of sigtimedwait()
    This will eliminate the need to use SIGIO everywhere.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

configure

diff --git a/configure b/configure
index 5f4d718..9ed05de 100755
--- a/configure
+++ b/configure
@@ -1957,6 +1957,21 @@
   splice=yes
 fi
 
+##########################################
+# signalfd probe
+signalfd="no"
+cat > $TMPC << EOF
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <signal.h>
+int main(void) { return syscall(SYS_signalfd, -1, NULL, _NSIG / 8); }
+EOF
+
+if compile_prog "" "" ; then
+  signalfd=yes
+fi
+
 # check if eventfd is supported
 eventfd=no
 cat > $TMPC << EOF
@@ -2559,6 +2574,9 @@
 if test "$fdt" = "yes" ; then
   echo "CONFIG_FDT=y" >> $config_host_mak
 fi
+if test "$signalfd" = "yes" ; then
+  echo "CONFIG_SIGNALFD=y" >> $config_host_mak
+fi
 if test "$need_offsetof" = "yes" ; then
   echo "CONFIG_NEED_OFFSETOF=y" >> $config_host_mak
 fi