More accurate exit code and clearer error messages for s6-svc and s6-svscanctl

1 files changed, 6 insertions, 4 deletions

diff --git a/src/supervision/s6-svscanctl.c b/src/supervision/s6-svscanctl.c
index 2794290..3339c67 100644
--- a/src/supervision/s6-svscanctl.c
+++ b/src/supervision/s6-svscanctl.c
@@ -13,7 +13,6 @@ int main (int argc, char const *const *argv)
 {
   char data[DATASIZE] ;
   unsigned int datalen = 0 ;
-  int r ;
   PROG = "s6-svscanctl" ;
   {
     subgetopt_t l = SUBGETOPT_ZERO ;
@@ -51,8 +50,11 @@ int main (int argc, char const *const *argv)
   }
   if (!argc) dieusage() ;
 
-  r = s6_svc_writectl(argv[0], S6_SVSCAN_CTLDIR, data, datalen) ;
-  if (r < 0) strerr_diefu2sys(111, "control ", argv[0]) ;
-  else if (!r) strerr_diefu3x(100, "control ", argv[0], ": supervisor not listening") ;
+  switch (s6_svc_writectl(argv[0], S6_SVSCAN_CTLDIR, data, datalen))
+  {
+    case -1 : strerr_diefu2sys(111, "control ", argv[0]) ;
+    case -2 : strerr_dief3sys(100, "something is wrong with the ", argv[0], "/" S6_SVSCAN_CTLDIR " directory. errno reported") ;
+    case 0 : strerr_diefu3x(100, "control ", argv[0], ": supervisor not listening") ;
+  }
   return 0 ;
 }