在 2017/11/22 22:19, Michael Kerrisk (man-pages) 写道:
Hello QingFeng,
+.SH RETURN VALUE
+On success, the return value of
+.BR s390_sthyi ()
+matches the condition code of the STHYI instructions, which is a value
+between 0-3 (that is: emulation succeeded).
+Return value of 0 indicates that CPU capacity information is stored to
+.I buffer.
+Return value of 3 indicates "unsupported function code" and buffer's
+content is unchanged.
Another question. What about the return values 1 and 2? Can they
occur? If yes, we should explain them. If they are reserved for future
use, we should say that.
Return values 1 and 2 are reserved currently, I'll add that like "Return
value of 1
and 2 are reserved." Thanks!
Cheers,
Michael
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Regards
QingFeng Hao
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