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| author | Michael Forney <mforney@mforney.org> | 2021-05-25 20:55:56 -0700 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2021-06-20 16:41:47 +0200 |
| commit | 96ff758c6e9cd5a01443ee15afbd0df4f00c37a8 (patch) | |
| tree | b9a4fa9a9f1bd37872a0c8b8fdee187c9837ee51 /configure | |
| parent | febf6fade63801ebca765797fa2ad9de8d9f2700 (diff) | |
| download | qemu-96ff758c6e9cd5a01443ee15afbd0df4f00c37a8.zip qemu-96ff758c6e9cd5a01443ee15afbd0df4f00c37a8.tar.gz qemu-96ff758c6e9cd5a01443ee15afbd0df4f00c37a8.tar.bz2 | |
linux-user: Use public sigev_notify_thread_id member if available
_sigev_un._tid is an internal glibc field and is not available on
musl libc. The sigevent(7) man page and Linux UAPI headers both use
sigev_notify_thread_id as a public way to access this field.
musl libc supports this field since 1.2.2[0], and glibc plans to
add support as well[1][2].
If sigev_notify_thread_id is not available, fall back to _sigev_un._tid
as before.
[0] http://git.musl-libc.org/cgit/musl/commit/?id=7c71792e87691451f2a6b76348e83ad1889f1dcb
[1] https://www.openwall.com/lists/musl/2019/08/01/5
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=27417
Signed-off-by: Michael Forney <mforney@mforney.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210526035556.7931-1-mforney@mforney.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 16 |
1 files changed, 16 insertions, 0 deletions
@@ -4441,6 +4441,19 @@ if compile_prog "" "" ; then fi ########################################## +# check if we have sigev_notify_thread_id + +sigev_notify_thread_id=no +cat > $TMPC << EOF +#include <stddef.h> +#include <signal.h> +int main(void) { return offsetof(struct sigevent, sigev_notify_thread_id); } +EOF +if compile_prog "" "" ; then + sigev_notify_thread_id=yes +fi + +########################################## # check if trace backend exists $python "$source_path/scripts/tracetool.py" "--backends=$trace_backends" --check-backends > /dev/null 2> /dev/null @@ -5692,6 +5705,9 @@ fi if test "$st_atim" = "yes" ; then echo "HAVE_STRUCT_STAT_ST_ATIM=y" >> $config_host_mak fi +if test "$sigev_notify_thread_id" = "yes" ; then + echo "HAVE_SIGEV_NOTIFY_THREAD_ID=y" >> $config_host_mak +fi if test "$byteswap_h" = "yes" ; then echo "CONFIG_BYTESWAP_H=y" >> $config_host_mak fi |