Add shared memory initializatin logic

include/sys/ipc.h

@@ -89,10 +89,12 @@ extern "C"
 
 struct ipc_perm
 {
+#if 0 /* User and group IDs not yet supported by NuttX */
   uid_t  uid;    /* Owner's user ID */
   gid_t  gid;    /* Owner's group ID */
   uid_t  cuid;   /* Creator's user ID */
   gid_t  cgid;   /* Creator's group ID */
+#endif
   mode_t mode;   /* Read/write permission */
 };
 

include/sys/shm.h

@@ -49,6 +49,7 @@
 /****************************************************************************
  * Pre-Processor Definitions
  ****************************************************************************/
+/* Definitions required by POSIX */
 
 #define SHM_RDONLY 0x01 /* Attach read-only (else read-write) */
 #define SHM_RND    0x02 /* Round attach address to SHMLBA */