_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 <mfor...@mforney.org> --- configure | 16 ++++++++++++++++ linux-user/syscall.c | 6 +++++- 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/configure b/configure index 676239c697..fa39b0a727 100755 --- a/configure +++ b/configure @@ -4462,6 +4462,19 @@ if compile_prog "" "" ; then st_atim=yes fi +########################################## +# check if we have sigev_notify_thread_id + +sigev_notify_thread_id=no +cat > $TMPC << EOF +#include <stddef.h> +#include <signal.h> +int main(void) { return offsetof(struct sigevent, sigev_notify_thread_id); } +EOF +if compile_prog "" "" ; then + sigev_notify_thread_id=yes +fi + ########################################## # check if trace backend exists @@ -5718,6 +5731,9 @@ fi if test "$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 diff --git a/linux-user/syscall.c b/linux-user/syscall.c index c9f812091c..63464f9a96 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -7393,6 +7393,10 @@ static inline abi_long host_to_target_timex64(abi_long target_addr, } #endif +#ifndef HAVE_SIGEV_NOTIFY_THREAD_ID +#define sigev_notify_thread_id _sigev_un._tid +#endif + static inline abi_long target_to_host_sigevent(struct sigevent *host_sevp, abi_ulong target_addr) { @@ -7413,7 +7417,7 @@ static inline abi_long target_to_host_sigevent(struct sigevent *host_sevp, host_sevp->sigev_signo = target_to_host_signal(tswap32(target_sevp->sigev_signo)); host_sevp->sigev_notify = tswap32(target_sevp->sigev_notify); - host_sevp->_sigev_un._tid = tswap32(target_sevp->_sigev_un._tid); + host_sevp->sigev_notify_thread_id = tswap32(target_sevp->_sigev_un._tid); unlock_user_struct(target_sevp, target_addr, 1); return 0; -- 2.31.1
