Enhance/fix VMS exit code handling.

* commands.c, function.c, hash.c, job.c, main.c, output.c:
use MAKE exit codes.
* makeint.h: encode make exit codes so that they are VMS compatible.
* job.c: check child exit code for VMS style exit codes.
* vmsjobs.c: save and return VMS style exit code.

commands.c

@@ -585,7 +585,7 @@ fatal_error_signal (int sig)
   if (sig == SIGQUIT)
     /* We don't want to send ourselves SIGQUIT, because it will
        cause a core dump.  Just exit instead.  */
-    exit (EXIT_FAILURE);
+    exit (MAKE_TROUBLE);
 #endif
 
 #ifdef WINDOWS32

function.c

@@ -1610,7 +1610,7 @@ char *
 func_shell_base (char *o, char **argv, int trim_newlines)
 {
   fprintf (stderr, "This platform does not support shell\n");
-  die (EXIT_FAILURE);
+  die (MAKE_TROUBLE);
   return NULL;
 }
 

hash.c

@@ -48,7 +48,7 @@ hash_init (struct hash_table *ht, unsigned long size,
     {
       fprintf (stderr, _("can't allocate %lu bytes for hash table: memory exhausted"),
 	       ht->ht_size * (unsigned long) sizeof (struct token *));
-      exit (1);
+      exit (MAKE_TROUBLE);
     }
 
   ht->ht_capacity = ht->ht_size - (ht->ht_size / 16); /* 93.75% loading factor */

job.c

@@ -510,9 +510,14 @@ child_error (struct child *child,
       OUTPUT_UNSET ();
       return;
     }
-
-  error (NILF, l + INTSTR_LENGTH,
-         _("%s[%s] Error 0x%x%s"), pre, f->name, exit_code, post);
+  /* Check for a Posix compatible VMS style exit code:
+     decode and print the Posix exit code */
+  if ((exit_code & 0x35a000) == 0x35a000)
+    error(NILF, l + INTSTR_LENGTH, _("%s[%s] Error %d%s"), pre, f->name,
+        ((exit_code & 0x7f8) >> 3), post);
+  else
+    error(NILF, l + INTSTR_LENGTH, _("%s[%s] Error 0x%x%s"), pre, f->name,
+        exit_code, post);
 #else
   if (exit_sig == 0)
     error (NILF, l + INTSTR_LENGTH,
@@ -982,7 +987,7 @@ reap_children (int block, int err)
       if (!err && child_failed && !dontcare && !keep_going_flag &&
           /* fatal_error_signal will die with the right signal.  */
           !handling_fatal_signal)
-        die (2);
+        die (MAKE_FAILURE);
 
       /* Only block for one child.  */
       block = 0;

main.c

@@ -1434,7 +1434,7 @@ main (int argc, char **argv, char **envp)
   if (print_version_flag)
     {
       print_version ();
-      die (0);
+      die (MAKE_SUCCESS);
     }
 
   if (ISDB (DB_BASIC))
@@ -2254,7 +2254,7 @@ main (int argc, char **argv, char **envp)
             if (any_remade)
               goto re_exec;
             if (any_failed)
-              die (2);
+              die (MAKE_FAILURE);
             break;
           }
 
@@ -2529,7 +2529,7 @@ main (int argc, char **argv, char **envp)
   }
 
   /* NOTREACHED */
-  exit (0);
+  exit (MAKE_SUCCESS);
 }
 
 /* Parsing of arguments, decoding of switches.  */
@@ -2894,7 +2894,7 @@ decode_switches (int argc, const char **argv, int env)
   if (!env && (bad || print_usage_flag))
     {
       print_usage (bad);
-      die (bad ? 2 : 0);
+      die (bad ? MAKE_FAILURE : MAKE_SUCCESS);
     }
 
   /* If there are any options that need to be decoded do it now.  */

makeint.h

@@ -630,10 +630,14 @@ extern int handling_fatal_signal;
 #define MAX(_a,_b) ((_a)>(_b)?(_a):(_b))
 #endif
 
+
 #ifdef VMS
-#  define MAKE_SUCCESS 1
-#  define MAKE_TROUBLE 2
-#  define MAKE_FAILURE 3
+/* These are the VMS __posix_exit compliant exit codes, constructed out of
+   STS$M_INHIB_MSG, C facility code, a POSIX condition code mask, MAKE_NNN<<3 and
+   the coresponding VMS severity, here STS$K_SUCCESS and STS$K_ERROR. */
+#  define MAKE_SUCCESS 0x1035a001
+#  define MAKE_TROUBLE 0x1035a00a
+#  define MAKE_FAILURE 0x1035a012
 #else
 #  define MAKE_SUCCESS 0
 #  define MAKE_TROUBLE 1

output.c

@@ -495,7 +495,7 @@ close_stdout (void)
         perror_with_name (_("write error: stdout"), "");
       else
         O (error, NILF, _("write error: stdout"));
-      exit (EXIT_FAILURE);
+      exit (MAKE_TROUBLE);
     }
 }
 
@@ -699,7 +699,7 @@ fatal (const gmk_floc *flocp, size_t len, const char *fmt, ...)
   assert (fmtbuf.buffer[len-1] == '\0');
   outputs (1, fmtbuf.buffer);
 
-  die (2);
+  die (MAKE_FAILURE);
 }
 
 /* Print an error message from errno.  */

vmsjobs.c

@@ -114,7 +114,7 @@ static int ctrlYPressed= 0;
 int
 vmsHandleChildTerm(struct child *child)
 {
-  int status;
+  int exit_code;
   register struct child *lastc, *c;
   int child_failed;
 
@@ -130,7 +130,9 @@ vmsHandleChildTerm(struct child *child)
 
   (void) sigblock (fatal_signal_mask);
 
-  child_failed = !(child->cstatus & 1 || ((child->cstatus & 7) == 0));
+  child_failed = !(child->cstatus & 1);
+  if (child_failed)
+    exit_code = child->cstatus;
 
   /* Search for a child matching the deceased one.  */
   lastc = 0;
@@ -202,7 +204,7 @@ vmsHandleChildTerm(struct child *child)
 
   /* If the job failed, and the -k flag was not given, die.  */
   if (child_failed && !keep_going_flag)
-    die (EXIT_FAILURE);
+    die (exit_code);
 
   (void) sigsetmask (sigblock (0) & ~(fatal_signal_mask));