Definition of _NERROR in errno.h
A. Schabel
anybody knows, why "#define _NERROR 70" is not defined to the maximum
error number plus one?
By the way i doubt the importance of this define statements existence,
since AFAIK it is reference in one file (commands/syslogd/syslogd.c)
only.
As I'm currently about to port Minix to a research processor platform,
some more questions like this may arise in future...
Best regards
Alex
Giovanni
> anybody knows, why "#define _NERROR 70" is not defined to the
> maximum error number plus one?
Because it should be expanded to the maximum number allowed as errno.
It was originally used in the declaration of the array of strings used
in the library function strerror() to avoid accesses out of the array
limits.
In Minix 3.1.2 it is of no use since the library function uses
variable _sys_nerr which is automatically defined as the size of the
array (see the file errlist.c).
> By the way i doubt the importance of this define statements
> existence, since AFAIK it is reference in one file
> (commands/syslogd/syslogd.c) only.
Because it was initially ported to a older version of Minix and
_NERROR was used to make the checks that now are already implemented
in strerror().
> As I'm currently about to port Minix to a research processor
> platform, some more questions like this may arise in future...
Ciao
Giovanni
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