[Nut-upsdev] Tiny suggestion for upslog.c

[Andy Juniper]

Hi

Thanks for a very nice piece of software.

I have a tiny suggestion for upslog.c.

It adds a signal handler for the USR1 signal, which simply triggers it 
to abort the current sleep and log the requested now.

I find it useful because my upssched-cmd can then killall -USR1 upslog 
to ensure that there is an entry in the log for brief power dropouts 
which would otherwise be unrecorded (because the power is only off for a 
few seconds).

I think that the patch is still valid against the latest source in GIT 
but was originally coded against 2.2.x.


thanks
Andy

--- nut-2.6.5/clients/upslog.c    2014-12-08 23:23:33.274059582 +0000
+++ nut-2.6.5/clients/upslog.c    2014-12-08 23:24:02.906586228 +0000
@@ -76,6 +76,11 @@
      exit_flag = sig;
  }

+static void set_print_now_flag(int sig)
+{
+    /* no need to do anything, the signal will cause sleep to be 
interrupted */
+}
+
  /* handlers: reload on HUP, exit on INT/QUIT/TERM */
  static void setup_signals(void)
  {
@@ -96,6 +101,11 @@
          fatal_with_errno(EXIT_FAILURE, "Can't install SIGQUIT handler");
      if (sigaction(SIGTERM, &sa, NULL) < 0)
          fatal_with_errno(EXIT_FAILURE, "Can't install SIGTERM handler");
+
+    sa.sa_handler = set_print_now_flag;
+    if (sigaction(SIGUSR1, &sa, NULL) < 0)
+        fatal_with_errno(EXIT_FAILURE, "Can't install SIGTERM handler");
+
  }

  static void help(const char *prog)