The default is for
stderr to go to the message file automatically.
The message file is available only as
stderr; you cannot use the
fopen() or
freopen() library
function to open it.
- freopen() with the null string ("") as filename string will fail.
- Record format (RECFM) is always treated as undefined (U). Logical
record length (LRECL) is always treated as 255 (the maximum length
defined by z/OS® Language Environment® message file system write interface).