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>
This commit is contained in:
Marcelo Tosatti 2010-10-11 15:31:15 -03:00 committed by Anthony Liguori
parent 296acb643b
commit dcc38d1cce
4 changed files with 179 additions and 0 deletions

18
configure vendored
View file

@ -1957,6 +1957,21 @@ if compile_prog "" "" ; then
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 > $TMPC << EOF
@ -2559,6 +2574,9 @@ fi
if test "$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