DF2895 KENV_SET(128-char name) rv=0 errno=0 (Undefined error: 0)
DF2895 KENV_GET(same name)      rv=-1 errno=2 (No such file or directory)
DF2895 KENV_SET(127-char name)  rv=0 errno=0 (control: works)
DF2895 KENV_GET(127-char name)  rv=9 value=df2895ok