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[PATCH 3/9] Checking mlockall symbol presence
From: |
David CARLIER |
Subject: |
[PATCH 3/9] Checking mlockall symbol presence |
Date: |
Mon, 29 Jun 2020 22:48:16 +0100 |
>From ac450c4abe03e0e461fede18727500e616d9f7e2 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Mon, 29 Jun 2020 22:15:21 +0000
Subject: [PATCH 3/9] Checking mlockall symbol presence.
Signed-off-by: David Carlier <devnexen@gmail.com>
---
configure | 15 +++++++++++++++
os-posix.c | 4 ++++
2 files changed, 19 insertions(+)
diff --git a/configure b/configure
index 50b559238f..0b278f1646 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 3cd52e1e70..e02b566940 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
}
--
2.26.0
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