From Lorenz Meier: The implementation of access() as vararg macro has the issue that any function call with the same name (even in a C++ class) will match with it and result in a compile error. I have replaced it with a small function, and tried to have decent documentation as well. This resolves the compile issue, and shouldn’t have negative side effects for users of the function.

include/unistd.h

@@ -167,8 +167,9 @@ FAR char *getcwd(FAR char *buf, size_t size);
 
 /* File path operations */
 
-int     unlink(FAR const char *pathname);
+int     access(FAR const char *path, int amode);
 int     rmdir(FAR const char *pathname);
+int     unlink(FAR const char *pathname);
 
 /* Execution of programs from files */
 
@@ -190,8 +191,6 @@ FAR char **getoptargp(void); /* Optional argument following option */
 int       *getoptindp(void); /* Index into argv */
 int       *getoptoptp(void); /* unrecognized option character */
 
-#define access(...) (0)
-
 #undef EXTERN
 #if defined(__cplusplus)
 }

libc/unistd/Make.defs

@@ -35,7 +35,8 @@
 
 # Add the unistd C files to the build
 
-CSRCS += lib_getopt.c lib_getoptargp.c lib_getoptindp.c lib_getoptoptp.c
+CSRCS += lib_access.c lib_getopt.c lib_getoptargp.c lib_getoptindp.c
+CSRCS += lib_getoptoptp.c
 
 ifneq ($(CONFIG_NFILE_DESCRIPTORS),0)
 ifneq ($(CONFIG_DISABLE_ENVIRON),y)

libc/unistd/lib_access.c

@@ -0,0 +1,92 @@
+/****************************************************************************
+ * lib/unistd/lib_access.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <unistd.h>
+
+/****************************************************************************
+ * Preprocessor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: access
+ *
+ * Description:
+ *   The access() function shall check the file named by the pathname pointed
+ *   to by the path argument for accessibility according to the bit pattern
+ *   contained in amode, using the real user ID in place of the effective user
+ *   ID and the real group ID in place of the effective group ID.
+ *   As there are no users in NuttX, the function always succeeds.
+ *
+ * Parameters:
+ *   path - a pointer to the path
+ *   amode - the access mode
+ *
+ * Returned Value:
+ *   Always OK (zero)
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int access(FAR const char *path, int amode)
+{
+  return 0;
+}