diff --git a/src/os/unix/ngx_posix_init.c b/src/os/unix/ngx_posix_init.c
index d46a65d..bacd035 100644
--- a/src/os/unix/ngx_posix_init.c
+++ b/src/os/unix/ngx_posix_init.c
@@ -99,8 +99,11 @@
 void ngx_signal_handler(int signo)
 {
     struct timeval   tv;
+    ngx_err_t        err;
     ngx_signal_t    *sig;
 
+    err = ngx_errno;
+
     for (sig = signals; sig->signo != 0; sig++) {
         if (sig->signo == signo) {
             break;
@@ -141,6 +144,8 @@
         ngx_change_binary = 1;
         break;
     }
+
+    ngx_set_errno(err);
 }
 
 
diff --git a/src/os/unix/ngx_process.c b/src/os/unix/ngx_process.c
index f7314a4..e500408 100644
--- a/src/os/unix/ngx_process.c
+++ b/src/os/unix/ngx_process.c
@@ -211,25 +211,6 @@
 }
 
 
-#if 0
-void ngx_sigchld_handler(int signo)
-{
-    int              status;
-    char            *process;
-    ngx_pid_t        pid;
-    ngx_err_t        err;
-    ngx_uint_t       i, one;
-    struct timeval   tv;
-
-    ngx_gettimeofday(&tv);
-    ngx_time_update(tv.tv_sec);
-
-    ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, 0,
-                  "signal #%d (SIGCHLD) received", signo);
-}
-#endif
-
-
 void ngx_process_get_status()
 {
     int              status;