From: David CARLIER <devne...@gmail.com>
Instead of assuming that all POSIX platforms provide mlockall(),
test for it in configure. If the host doesn't provide this platform
then os_mlock() will fail -ENOSYS, as it does already on Windows.
This is necessary for Haiku, which does not have mlockall().
Signed-off-by: David Carlier <devne...@gmail.com>
[PMM: Expanded commit message]
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
configure | 15 +++++++++++++++
os-posix.c | 4 ++++
2 files changed, 19 insertions(+)
diff --git a/configure b/configure
index 5455ae10d05..ddc53d873ef 100755
--- a/configure
+++ b/configure
@@ -2392,6 +2392,18 @@ else
pty_h=no
fi
+cat > $TMPC <<EOF
+#include <sys/mman.h>
+int main(int argc, char *argv[]) {
+ return mlockall(MCL_FUTURE);
+}
+EOF
+if compile_prog "" "" ; then
+ have_mlockall=yes
+else
+ have_mlockall=no
+fi
+
#########################################
# vhost interdependencies and host support
@@ -7865,6 +7877,9 @@ fi
if test "$pty_h" = "yes" ; then
echo "CONFIG_PTY=y" >> $config_host_mak
fi
+if test "$have_mlockall" = "yes" ; then
+ echo "CONFIG_MLOCKALL=y" >> $config_host_mak
+fi
if test "$fuzzing" = "yes" ; then
if test "$have_fuzzer" = "yes"; then
FUZZ_LDFLAGS=" -fsanitize=address,fuzzer"
diff --git a/os-posix.c b/os-posix.c
index 3cd52e1e700..e02b566940c 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -337,6 +337,7 @@ bool is_daemonized(void)
int os_mlock(void)
{
+#if defined CONFIG_MLOCKALL
int ret = 0;
ret = mlockall(MCL_CURRENT | MCL_FUTURE);
@@ -345,4 +346,7 @@ int os_mlock(void)
}
return ret;
+#else
+ return -ENOSYS;
+#endif
}
--
2.20.1
