08-17-2012
You're asking like UNIX is a kind of computer; it isn't.
UNIX can run on many kinds of processors and memories, on scales from embedded microcomputer(things like wireless routers) all the way up to distributed clusters and supercomputers.
There's also many kinds of kernels of several kinds you mention; there's real-tasking UNIXes(QNX), monolithic(Linux, though that's technically UNIX-like), and more.
How is this possible?
Easy -- they're not all the same thing. UNIX is a design plan, not an operating system. As long as your OS is certified as providing the right set of features, it can be considered a UNIX, no matter how it's built internally. Lots of different individuals and software companies have built a UNIX to their own design or need.
So, it's very difficult to be anything but vague about "what is UNIX" with respect to those particular questions. You need to be more specific about which UNIX.
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LEARN ABOUT REDHAT
wctype
WCTYPE(3) Linux Programmer's Manual WCTYPE(3)
NAME
wctype - wide character classification
SYNOPSIS
#include <wctype.h>
wctype_t wctype(const char *name);
DESCRIPTION
The wctype_t type represents a property which a wide character may or may not have. In other words, it represents a class of wide charac-
ters. This type's nature is implementation dependent, but the special value (wctype_t)0 denotes an invalid property. Nonzero wctype_t val-
ues can be passed to the iswctype function to actually test whether a given wide character has the property.
The wctype function returns a property, given by its name. The set of valid names depends on the LC_CTYPE category of the current locale,
but the following names are valid in all locales.
"alnum" - realizes the isalnum classification function
"alpha" - realizes the isalpha classification function
"blank" - realizes the isblank classification function
"cntrl" - realizes the iscntrl classification function
"digit" - realizes the isdigit classification function
"graph" - realizes the isgraph classification function
"lower" - realizes the islower classification function
"print" - realizes the isprint classification function
"punct" - realizes the ispunct classification function
"space" - realizes the isspace classification function
"upper" - realizes the isupper classification function
"xdigit" - realizes the isxdigit classification function
RETURN VALUE
The wctype function returns a property descriptor if the name is valid. Otherwise it returns (wctype_t)0.
CONFORMING TO
ISO/ANSI C, UNIX98
SEE ALSO
iswctype(3)
NOTES
The behaviour of wctype depends on the LC_CTYPE category of the current locale.
GNU
1999-07-25 WCTYPE(3)