Environment variables WIP, fix waiting scheduling issues + CE cancel proc

ce/Makefile

@@ -8,6 +8,7 @@ $(eval $(call add_lib,libioutil))
 $(eval $(call add_lib,libterminal))
 $(eval $(call add_lib,libfat))
 $(eval $(call add_lib,libmalloc))
+$(eval $(call add_lib,libdebugconsole))
 $(eval $(call add_include,libkb))
 
 cflags += -DPRINTF_INCLUDE_CONFIG_H=1

ce/interp.c

@@ -5,6 +5,7 @@
 #include "mprintf.h"
 #include "parser.h"
 #include "self.h"
+#include <debugconsole.h>
 #include <desc.h>
 #include <filereader.h>
 #include <filewriter.h>
@@ -339,15 +340,12 @@ static void help (struct context* context) {
 }
 
 static void cmd_cancel_proc (void* arg) {
-  int pid = *(int*)arg;
+  int pid = (int)arg;
 
   char ch = 0;
-  for (;;) {
+  do {
     mail_receive (&ch, 1);
-
-    if (ch == KB_CTRL ('C'))
-      break;
-  }
+  } while (ch != KB_CTRL ('C'));
 
   kill (pid);
 }
@@ -407,12 +405,12 @@ static void execute_cmd (struct ast_cmd* cmd, struct context* context) {
       return;
     }
 
-    struct process_data* cancel_pdata = process_spawn (&cmd_cancel_proc, &pid);
+    struct process_data* cancel_pdata = process_spawn (&cmd_cancel_proc, (void*)pid);
 
     wait_for_pid (pid);
 
-    if (kill (cancel_pdata->pid) < 0)
-      free (cancel_pdata);
+    kill (cancel_pdata->pid);
+    process_data_free (cancel_pdata);
   }
 }