From 7d517413cbe2ff0af2024443cf0d649ce4d564cc Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Wed, 20 Jul 2016 10:46:05 -0600
Subject: [PATCH] Things that use mkfifo() and pipe() depend on CONFIG_PIPES

---
 examples/README.txt     | 2 +-
 examples/cpuhog/Kconfig | 9 +++++----
 examples/pipe/Kconfig   | 1 +
 examples/poll/Kconfig   | 2 +-
 nshlib/Kconfig          | 1 +
 nshlib/README.txt       | 2 +-
 nshlib/nsh.h            | 2 +-
 nshlib/nsh_command.c    | 2 +-
 nshlib/nsh_fscmds.c     | 2 +-
 9 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/examples/README.txt b/examples/README.txt
index c79fb01d2..3331fe2e9 100644
--- a/examples/README.txt
+++ b/examples/README.txt
@@ -1489,7 +1489,7 @@ examples/pca9635
 examples/pipe
 ^^^^^^^^^^^^^
 
-  A test of the mkfifo() and pipe() APIs.
+  A test of the mkfifo() and pipe() APIs.  Requires CONFIG_PIPES
 
  * CONFIG_EXAMPLES_PIPE_STACKSIZE
      Sets the size of the stack to use when creating the child tasks.
diff --git a/examples/cpuhog/Kconfig b/examples/cpuhog/Kconfig
index f68d4b37b..47a5b3702 100644
--- a/examples/cpuhog/Kconfig
+++ b/examples/cpuhog/Kconfig
@@ -4,10 +4,11 @@
 #
 
 config EXAMPLES_CPUHOG
-    bool "CPU hog"
-    default n
-    ---help---
-        Enable the cpuhog example
+	bool "CPU hog"
+	default n
+	depends on PIPES
+	---help---
+		Enable the cpuhog example
 
 if EXAMPLES_CPUHOG
 
diff --git a/examples/pipe/Kconfig b/examples/pipe/Kconfig
index 48142315d..d6ca33bc8 100644
--- a/examples/pipe/Kconfig
+++ b/examples/pipe/Kconfig
@@ -6,6 +6,7 @@
 config EXAMPLES_PIPE
 	bool "Pipe example"
 	default n
+	depends on PIPES
 	---help---
 		Enable the pipe example
 
diff --git a/examples/poll/Kconfig b/examples/poll/Kconfig
index 5d26f9bb6..f07412fa3 100644
--- a/examples/poll/Kconfig
+++ b/examples/poll/Kconfig
@@ -6,7 +6,7 @@
 config EXAMPLES_POLL
 	bool "Poll example"
 	default n
-	depends on !NSH_BUILTIN_APPS
+	depends on !NSH_BUILTIN_APPS && PIPES
 	---help---
 		Enable the poll example
 
diff --git a/nshlib/Kconfig b/nshlib/Kconfig
index adce702a2..60e6d4e25 100644
--- a/nshlib/Kconfig
+++ b/nshlib/Kconfig
@@ -344,6 +344,7 @@ config NSH_DISABLE_MKFIFO
 	bool "Disable mkfifo"
 	default y if DEFAULT_SMALL
 	default n if !DEFAULT_SMALL
+	depends on PIPES
 
 config NSH_DISABLE_MKRD
 	bool "Disable mkrd"
diff --git a/nshlib/README.txt b/nshlib/README.txt
index c315ecfc5..a5e3c3003 100644
--- a/nshlib/README.txt
+++ b/nshlib/README.txt
@@ -1201,7 +1201,7 @@ Command Dependencies on Configuration Settings
   mb,mh,mw   ---
   mkdir      (((!CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_WRITABLE) || !CONFIG_DISABLE_PSEUDOFS_OPERATIONS) && CONFIG_NFILE_DESCRIPTORS > 0)
   mkfatfs    !CONFIG_DISABLE_MOUNTPOINT && CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_FS_FAT
-  mkfifo     CONFIG_NFILE_DESCRIPTORS > 0
+  mkfifo     CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_PIPES
   mkrd       !CONFIG_DISABLE_MOUNTPOINT && CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_FS_WRITABLE (see note 4)
   mount      !CONFIG_DISABLE_MOUNTPOINT && CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_FS_READABLE (see note 3)
   mv         (((!CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_WRITABLE) || !CONFIG_DISABLE_PSEUDOFS_OPERATIONS) && CONFIG_NFILE_DESCRIPTORS > 0) (see note 4)
diff --git a/nshlib/nsh.h b/nshlib/nsh.h
index 9883c6ce4..3f6f57414 100644
--- a/nshlib/nsh.h
+++ b/nshlib/nsh.h
@@ -1039,7 +1039,7 @@ int cmd_lsmod(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
 #   if defined(CONFIG_SMART_DEV_LOOP) && !defined(CONFIG_NSH_DISABLE_LOSMART)
        int cmd_losmart(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
 #   endif
-#   ifndef CONFIG_NSH_DISABLE_MKFIFO
+#   if defined(CONFIG_PIPES) && !defined(CONFIG_NSH_DISABLE_MKFIFO)
        int cmd_mkfifo(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
 #   endif
 #   ifdef CONFIG_FS_READABLE
diff --git a/nshlib/nsh_command.c b/nshlib/nsh_command.c
index ee820bb93..7aa6b1ad3 100644
--- a/nshlib/nsh_command.c
+++ b/nshlib/nsh_command.c
@@ -297,7 +297,7 @@ static const struct cmdmap_s g_cmdmap[] =
 #endif
 
 #if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
-# ifndef CONFIG_NSH_DISABLE_MKFIFO
+# if defined(CONFIG_PIPES) && !defined(CONFIG_NSH_DISABLE_MKFIFO)
   { "mkfifo",   cmd_mkfifo,   2, 2, "<path>" },
 # endif
 #endif
diff --git a/nshlib/nsh_fscmds.c b/nshlib/nsh_fscmds.c
index 00fd8431b..7dccf1e76 100644
--- a/nshlib/nsh_fscmds.c
+++ b/nshlib/nsh_fscmds.c
@@ -1181,7 +1181,7 @@ int cmd_mkfatfs(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
  ****************************************************************************/
 
 #if CONFIG_NFILE_DESCRIPTORS > 0
-#ifndef CONFIG_NSH_DISABLE_MKFIFO
+#if defined(CONFIG_PIPES) && !defined(CONFIG_NSH_DISABLE_MKFIFO)
 int cmd_mkfifo(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
 {
   char *fullpath = nsh_getfullpath(vtbl, argv[1]);