From: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>
signal() function is the simpler version of sigaction(). Unlike
sigaction(), which fully controls the `struct sigaction`, the caller
only cares about the sa_handler when calling the signal() function.
signal() internally calls sigaction().
Signed-off-by: Ammar Faizi <ammarfaizi2@xxxxxxxxxxx>
---
tools/include/nolibc/sys.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 7d594155e77f..54e51f154b1f 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -1119,6 +1119,31 @@ int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
return ret;
}
+/*
+ * sighandler_t signal(int signum, sighandler_t handler);
+ */
+
+static __attribute__((unused))
+sighandler_t signal(int signum, sighandler_t handler)
+{
+ const struct sigaction act = {
+ .sa_handler = handler,
+ .sa_flags = SA_RESTORER,
+ .sa_restorer = __restore_rt
+ };
+ sighandler_t old_sah;
+ struct sigaction old;
+ int ret;
+
+ ret = sys_sigaction(signum, &act, &old);
+ if (ret < 0) {
+ SET_ERRNO(-ret);
+ old_sah = SIG_ERR;
+ } else {
+ old_sah = old.sa_handler;
+ }
+ return old_sah;
+}
/*
* int stat(const char *path, struct stat *buf);
--
Ammar Faizi
