Make sure exited preprocessor gets cleaned up when running with PID 1.

* NEWS: Version 1.4.90
* configure.ac: Version 1.4.90
* src/pies.c (main): When running with PID 1, install a minimal
SIGCHLD handler before parsing configuration files.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/pies.c b/src/pies.c
index 75285dc..a8529ac 100644
--- a/src/pies.c
+++ b/src/pies.c
@@ -1885,6 +1885,13 @@ sig_handler (int sig)
     }
 }
 
+RETSIGTYPE
+sigchld_early (int sig)
+{
+  while (waitpid (-1, NULL, WNOHANG) != -1)
+    ;
+}
+
 void
 setsigvhan (RETSIGTYPE (*handler) (int signo), int *sigv, int sigc)
 {
@@ -2284,6 +2291,12 @@ main (int argc, char **argv)
   set_quoting_style (NULL, shell_quoting_style);
 
   init_process = getpid () == 1;
+  if (init_process)
+    {
+      int s[] = { SIGCHLD };
+      setsigvhan (sigchld_early, s, 1);
+    }
+  
   for (i = 1; i < argc; i++)
     {
       if (strcmp (argv[i], "--no-init") == 0)