add a bit more error checking

1 files changed, 10 insertions, 3 deletions

diff --git a/libdaemon/dfork.c b/libdaemon/dfork.c
index 464af49..be57c09 100644
--- a/libdaemon/dfork.c
+++ b/libdaemon/dfork.c
@@ -131,14 +131,21 @@ pid_t daemon_fork(void) {
     sa_new.sa_handler = sigchld;
     sa_new.sa_flags = SA_RESTART;
 
+    if (sigemptyset(&ss_new) < 0) {
+        daemon_log(LOG_ERR, "sigemptyset() failed: %s", strerror(errno));
+        return (pid_t) -1;
+    }
+
+    if (sigaddset(&ss_new, SIGCHLD) < 0) {
+        daemon_log(LOG_ERR, "sigaddset() failed: %s", strerror(errno));
+        return (pid_t) -1;
+    }
+
     if (sigaction(SIGCHLD, &sa_new, &sa_old) < 0) {
         daemon_log(LOG_ERR, "sigaction() failed: %s", strerror(errno));
         return (pid_t) -1;
     }
 
-    sigemptyset(&ss_new);
-    sigaddset(&ss_new, SIGCHLD);
-
     if (sigprocmask(SIG_UNBLOCK, &ss_new, &ss_old) < 0) {
         daemon_log(LOG_ERR, "sigprocmask() failed: %s", strerror(errno));