Hi,
On 2025. 06. 14. 18:09, Nadav Tasher wrote:
This commit adds the reset_all_signals() function,
which resets all custom signal handlers to the default
signal handler (SIG_DFL).
Signed-off-by: Nadav Tasher <[email protected]>
---
include/libbb.h | 2 ++
libbb/signals.c | 26 ++++++++++++++++++++++++++
2 files changed, 28 insertions(+)
diff --git a/include/libbb.h b/include/libbb.h
index ed2af5af2..11d2c27ec 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -649,6 +649,8 @@ int sigprocmask2(int how, sigset_t *set) FAST_FUNC;
/* Standard handler which just records signo */
extern smallint bb_got_signal;
void record_signo(int signo); /* not FAST_FUNC! */
+/* Resets all signal handlers just like exec() does */
+void reset_all_signals(void) FAST_FUNC;
void xsetgid(gid_t gid) FAST_FUNC;
diff --git a/libbb/signals.c b/libbb/signals.c
index 0bebc847d..2211a8bac 100644
--- a/libbb/signals.c
+++ b/libbb/signals.c
@@ -128,3 +128,29 @@ void FAST_FUNC signal_no_SA_RESTART_empty_mask(int sig,
void (*handler)(int))
sa.sa_handler = handler;
sigaction_set(sig, &sa);
}
+
+void FAST_FUNC reset_all_signals(void)
+{
+ struct sigaction sa;
spaces -> tabs
+ memset(&sa, 0, sizeof(sa));
+
+ /* used as the default sigaction */
+ sa.sa_handler = SIG_DFL;
+
+ for (int sig = 1; sig < NSIG; ++sig) {
+ struct sigaction old;
+
+ /* returns 0 on success*/
+ if (sigaction(sig, NULL, &old) != 0)
+ continue;
+
+ if (old.sa_handler == SIG_IGN)
+ continue;
+
+ if (old.sa_handler == SIG_DFL)
+ continue;
+
+ /* change signal handler to default */
+ sigaction(sig, &sa, NULL);
+ }
+}
\ No newline at end of file
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