feature: added an FFI API for setting the SA_RESTART flag on given

signals.

Author: thibaultcha

src/ngx_http_lua_worker.c

@@ -190,4 +190,46 @@ ngx_http_lua_ffi_process_signal_graceful_exit(void)
 {
     ngx_quit = 1;
 }
+
+
+int
+ngx_http_lua_ffi_enable_sa_restart(int signum, int enabled, u_char *err,
+    size_t *errlen)
+{
+#if !(NGX_WIN32)
+    struct sigaction        act;
+
+    if (ngx_process != NGX_PROCESS_WORKER
+        && ngx_process != NGX_PROCESS_SINGLE)
+    {
+        *errlen = ngx_snprintf(err, *errlen, "must be called from worker"
+                               " process")
+                  - err;
+        return NGX_ERROR;
+    }
+
+    if (sigaction(signum, NULL, &act) != 0) {
+        *errlen = ngx_snprintf(err, *errlen, "failed to get sigaction for "
+                               " signal %d (%s)", strerror(errno))
+                  - err;
+        return NGX_ERROR;
+    }
+
+    if (enabled) {
+        act.sa_flags |= SA_RESTART;
+
+    } else {
+        act.sa_flags &= ~SA_RESTART;
+    }
+
+    if (sigaction(signum, &act, NULL) != 0) {
+        *errlen = ngx_snprintf(err, *errlen, "failed to set SA_RESTART for "
+                               " signal %d (%s)", strerror(errno))
+                  - err;
+        return NGX_ERROR;
+    }
+#endif
+
+    return NGX_OK;
+}
 #endif