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-rw-r--r--include/libbb.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 9e0970095..638c58412 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -544,6 +544,8 @@ void sig_unblock(int sig) FAST_FUNC;
int sigaction_set(int sig, const struct sigaction *act) FAST_FUNC;
/* SIG_BLOCK/SIG_UNBLOCK all signals: */
int sigprocmask_allsigs(int how) FAST_FUNC;
+/* SIG_SETMASK set, and return old set in the same set: */
+int sigprocmask_SIG_SETMASK(sigset_t *set) FAST_FUNC;
/* Standard handler which just records signo */
extern smallint bb_got_signal;
void record_signo(int signo); /* not FAST_FUNC! */