The chdir call is compatible with SVr4, SVID, POSIX, X/OPEN, 4.4BSD. SVr4
documents additional EINTR, ENOLINK, and EMULTIHOP error conditions but has no
ENOMEM. POSIX.1 does not have ENOMEM or ELOOP error conditions. X/OPEN does
not have EFAULT, ENOMEM or EIO error conditions.
The fchdir call is compatible with SVr4, 4.4BSD and X/OPEN. SVr4
documents additional EIO, EINTR, and ENOLINK error conditions. X/OPEN
documents additional EINTR and EIO error conditions.