inetd: small shrink for NOMMU case

function                                             old     new   delta
cat_args                                               -       8      +8
echo_stream                                           64      63      -1
discard_stream                                        64      63      -1
static.args                                           32      12     -20
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/3 up/down: 8/-22)             Total: -14 bytes

1 files changed, 14 insertions, 9 deletions

diff --git a/networking/inetd.c b/networking/inetd.c
index eb19d1630..d71a1159c 100644
--- a/networking/inetd.c
+++ b/networking/inetd.c
@@ -1413,6 +1413,10 @@ int inetd_main(int argc ATTRIBUTE_UNUSED, char **argv)
         } /* for (;;) */
 }
 
+#if !BB_MMU
+static const char *const cat_args[] = { "cat", NULL };
+#endif
+
 /*
  * Internet services provided internally by inetd:
  */
@@ -1430,13 +1434,13 @@ static void echo_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
         }
 #else
         /* We are after vfork here! */
-        static const char *const args[] = { "cat", NULL };
-        /* move network socket to stdin */
+        /* move network socket to stdin/stdout */
         xmove_fd(s, STDIN_FILENO);
         xdup2(STDIN_FILENO, STDOUT_FILENO);
         /* no error messages please... */
-        xmove_fd(xopen("/dev/null", O_WRONLY), STDERR_FILENO);
-        BB_EXECVP("cat", (char**)args);
+        close(STDERR_FILENO);
+        xopen("/dev/null", O_WRONLY);
+        BB_EXECVP("cat", (char**)cat_args);
         /* on failure we return to main, which does exit(1) */
 #endif
 }
@@ -1467,13 +1471,14 @@ static void discard_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
                 continue;
 #else
         /* We are after vfork here! */
-        static const char *const args[] = { "dd", "of=/dev/null", NULL };
         /* move network socket to stdin */
         xmove_fd(s, STDIN_FILENO);
-        xdup2(STDIN_FILENO, STDOUT_FILENO);
-        /* no error messages */
-        xmove_fd(xopen("/dev/null", O_WRONLY), STDERR_FILENO);
-        BB_EXECVP("dd", (char**)args);
+        /* discard output */
+        close(STDOUT_FILENO);
+        xopen("/dev/null", O_WRONLY);
+        /* no error messages please... */
+        xdup2(STDOUT_FILENO, STDERR_FILENO);
+        BB_EXECVP("cat", (char**)cat_args);
         /* on failure we return to main, which does exit(1) */
 #endif
 }