merge r3473, r3474, r3385, r3386, r3537:

signal processing stability:

*) use sys_errlist[] in signal handler instead
   of non Async-Signal-Safe strerror_r()
*) do not update time in the timer signal handler,
   since localtime_r() is not Async-Signal-Safe function
*) use previously cached GMT offset value to update time from a signal handler
*) change ngx_time_update() interface since there are no notification methods
   those return time
*) introduce ngx_time_sigsafe_update() to update the error log time only
*) change ngx_time_update() interface

1 files changed, 7 insertions, 6 deletions

diff --git a/src/os/unix/ngx_process.c b/src/os/unix/ngx_process.c
index 21a92f178..5e230f5bb 100644
--- a/src/os/unix/ngx_process.c
+++ b/src/os/unix/ngx_process.c
@@ -315,7 +315,7 @@ ngx_signal_handler(int signo)
         }
     }
 
-    ngx_time_update(0, 0);
+    ngx_time_sigsafe_update();
 
     action = "";
 
@@ -476,16 +476,17 @@ ngx_process_get_status(void)
              */
 
             if (err == NGX_ECHILD) {
-                ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, errno,
-                              "waitpid() failed");
+                ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, 0,
+                              "waitpid() failed (%d: %s)",
+                              err, ngx_sigsafe_strerror(err));
                 return;
             }
 
 #endif
 
-            ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, errno,
-                          "waitpid() failed");
-
+            ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
+                          "waitpid() failed (%d: %s)",
+                          err, ngx_sigsafe_strerror(err));
             return;
         }