environment
envp = environment();
shellexec(argptr, environment(), pathval(), 0, 0);
char **environment(void);
char **environment; /* On some arches, pointer to environment */
environment = &argv[1];
for (env = environment; env[0]; env++) {
static char **environment;
environment = &argv[1];
for (env = environment; env[0]; env++) {
#define __RENAME(x) no renaming in kernel/standalone environment