Return -2 if a subprocess was spun off to do the real work, -1
(setting errno) if unsuccessful, 0 if successful. */
int savewd_chdir (struct savewd *wd, char const *dir, int options,
Return -2 if a subprocess was spun off to do the real work, -1
(setting errno) if unsuccessful, 0 if successful. */
int savewd_chdir (struct savewd *wd, char const *dir, int options,