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build: Check that mlockall() exists

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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 <devnexen@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200703145614.16684-4-peter.maydell@linaro.org
[PMM: Expanded commit message; rename to HAVE_MLOCKALL]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
David CARLIER 2020-07-13 14:36:09 +01:00 • committed by Peter Maydell
parent c9c8b88f0b
commit 195588ccd5
2 changed files with 19 additions and 0 deletions
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15
configure vendored
View file

@ -2408,6 +2408,18 @@ else
pty_h=no pty_h=no
fi fi
cat > $TMPC <<EOF
#include <sys/mman.h>
int main(int argc, char *argv[]) {
return mlockall(MCL_FUTURE);
}
EOF
if compile_prog "" "" ; then
have_mlockall=yes
else
have_mlockall=no
fi
######################################### #########################################
# vhost interdependencies and host support # vhost interdependencies and host support
@ -7902,6 +7914,9 @@ fi
if test "$pty_h" = "yes" ; then if test "$pty_h" = "yes" ; then
echo "HAVE_PTY_H=y" >> $config_host_mak echo "HAVE_PTY_H=y" >> $config_host_mak
fi fi
if test "$have_mlockall" = "yes" ; then
echo "HAVE_MLOCKALL=y" >> $config_host_mak
fi
if test "$fuzzing" = "yes" ; then if test "$fuzzing" = "yes" ; then
if test "$have_fuzzer" = "yes"; then if test "$have_fuzzer" = "yes"; then
FUZZ_LDFLAGS=" -fsanitize=address,fuzzer" FUZZ_LDFLAGS=" -fsanitize=address,fuzzer"

4
os-posix.c
View file

@ -337,6 +337,7 @@ bool is_daemonized(void)
int os_mlock(void) int os_mlock(void)
{ {
#ifdef HAVE_MLOCKALL
int ret = 0; int ret = 0;
ret = mlockall(MCL_CURRENT | MCL_FUTURE); ret = mlockall(MCL_CURRENT | MCL_FUTURE);
@ -345,4 +346,7 @@ int os_mlock(void)
} }
return ret; return ret;
#else
return -ENOSYS;
#endif
} }