Add execv() and execl(); Move lm3s header files for compatibility

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5492 42af7a65-404d-4744-a932-0658087f49c3

nuttx/include/nuttx/binfmt/binfmt.h

@@ -228,7 +228,8 @@ int exec_module(FAR const struct binary_s *bin, int priority);
  *
  * Description:
  *   This is a convenience function that wraps load_ and exec_module into
- *   one call.
+ *   one call.  The priority of the executed program is set to be the
+ *   same as the priority of the calling thread.
  *
  * Input Parameter:
  *   filename - Fulll path to the binary to be loaded

nuttx/include/unistd.h

@@ -160,6 +160,13 @@ EXTERN FAR char *getcwd(FAR char *buf, size_t size);
 EXTERN int     unlink(FAR const char *pathname);
 EXTERN int     rmdir(FAR const char *pathname);
 
+/* Execution of programs from files */
+
+#ifdef CONFIG_LIBC_EXECFUNCS
+EXTERN int     execl(FAR const char *path, ...);
+EXTERN int     execv(FAR const char *path, FAR char *const argv[]);
+#endif
+
 /* Other */
 
 EXTERN int     getopt(int argc, FAR char *const argv[], FAR const char *optstring);