exec_vp
extern Boolean exec_vp(char *name, char **argv, char **envp,
(void) exec_vp(argv[1], argv, environ, ignore_error, vroot_path);
static Boolean exec_vp(char *name, char **argv, char **envp, Boolean ignore_error, pathpt vroot_path);
vnode_t *exec_vp, *execdir_vp, *cdir, *rdir;
exec_vp = p->p_exec;
if (exec_vp) {
(void) VOP_CLOSE(exec_vp, FREAD, 1, (offset_t)0, CRED(), NULL);
VN_RELE(exec_vp);
vnode_t *exec_vp = p->p_exec;
VN_RELE(exec_vp);