can "stdio.h" be OS specific at the kernal level or ? i know what I'm
trying to ask here but not sure how to word it :-)
--
Woodzy http://www.rtdos.com/forum 53  4518 
Sorry, could you try to reword your post. I am quite sure many would
like to answer your question.
In comp.lang.c "\(ProteanThrea d\)" <sy***@rtdos.co m> wrote: can "stdio.h" be OS specific at the kernal level or ? i know what I'm
trying to ask here but not sure how to word it :-)
What means "OS specific at the kernal level"? If you have a kernel
header named "stdio.h" it got nothing to do with the file of the
same name used for userland programs. And the userland header also
depends on OS specific properties, the compiler and the libc, so it
won't be identical to a "stdio.h" you get for a different system/
compiler/libc combination.
Regards, Jens
--
\ Jens Thoms Toerring ___ Je***********@p hysik.fu-berlin.de
\______________ ____________ http://www.toerring.de
[posting from comp.lang.c; fups set]
On Tue, 8 Mar 2005, (ProteanThread) wrote:
can "stdio.h" be OS specific at the kernal level or ? i know what I'm
trying to ask here but not sure how to word it :-)
You mean, what's "inside" <stdio.h>? The answer, as far as this
newsgroup is concerned (i.e., as far as the standard C language is
concerned) is: Whatever the implementor feels like. Could be completely
high-level stuff; could be lines and lines of machine-specific assembly
code; could be a bunch of Unix system calls; could be pink elephants
in tutus. We don't know what <stdio.h> "looks" like on your system, and
we don't care. You don't need to care, either, if all you're doing is
writing programs in C.
If your implementation is like many other implementations , you'll
actually have a text file somewhere on your hard disk called "stdio.h".
If you can find it, open it up and take a look. You'll probably find
out that it's full of arcane, basically incomprehensibl e pseudo-C with
lots of underscores in funny places. Don't ask us what it means; we
don't know. (Or rather, some of us probably do know what it all means
on /our/ systems, but may have no idea about yours --- and besides, if
we start explaining implementation internals to you, then we'll have to
explain implementation internals to everyone, and there are /hundreds/
of of implementations out there, all different. And then there wouldn't
be any room here to talk about C anymore.)
Bottom line: The implementation of <stdio.h> contains tygers. This
newsgroup doesn't talk about tygers. But if you have questions about
how to use <stdio.h> or the standard library functions it defines,
this is definitely the place to ask.
HTH,
-Arthur
<Je***********@ physik.fu-berlin.de> wrote in message
news:39******** *****@uni-berlin.de...
What means "OS specific at the kernal level"? If you have a kernel
header named "stdio.h" it got nothing to do with the file of the
same name used for userland programs. And the userland header also
depends on OS specific properties, the compiler and the libc, so it
won't be identical to a "stdio.h" you get for a different system/
compiler/libc combination.
so "stdio.h" is not the same not only from compiler to compiler but also
from OS to OS ?
"Minti" <im*******@gmai l.com> wrote in message
news:11******** **************@ f14g2000cwb.goo glegroups.com.. . Sorry, could you try to reword your post. I am quite sure many would
like to answer your question.
sorry, what I mean is "stdio.h" compiler dependent or OS dependent? or can
I create my own "stdio.h" lib for my own OS ?
"Arthur J. O'Dwyer" <aj*@nospam.and rew.cmu.edu> wrote in message
news:Pi******** *************** ***********@uni x43.andrew.cmu. edu...
You mean, what's "inside" <stdio.h>? The answer, as far as this
newsgroup is concerned (i.e., as far as the standard C language is
concerned) is: Whatever the implementor feels like. Could be completely
high-level stuff; could be lines and lines of machine-specific assembly
code; could be a bunch of Unix system calls; could be pink elephants
in tutus. We don't know what <stdio.h> "looks" like on your system, and
we don't care. You don't need to care, either, if all you're doing is
writing programs in C.
So its more compiler dependent than OS dependent?
If your implementation is like many other implementations , you'll
actually have a text file somewhere on your hard disk called "stdio.h".
If you can find it, open it up and take a look. You'll probably find
out that it's full of arcane, basically incomprehensibl e pseudo-C with
lots of underscores in funny places. Don't ask us what it means; we
don't know. (Or rather, some of us probably do know what it all means
on /our/ systems, but may have no idea about yours --- and besides, if
we start explaining implementation internals to you, then we'll have to
explain implementation internals to everyone, and there are /hundreds/
of of implementations out there, all different. And then there wouldn't
be any room here to talk about C anymore.)
But if i were designing my own OS, can I create my own custom "stdio.h" lib
?
Bottom line: The implementation of <stdio.h> contains tygers. This
newsgroup doesn't talk about tygers. But if you have questions about
how to use <stdio.h> or the standard library functions it defines,
this is definitely the place to ask.
ok, few more questions:
1. what's a tyger?
2. can the standard library be redefined? (i.e. create my own standard
library?)
3. is "stdio.h" always necessary in plain C?
I'm probably going to be sticking my foot in my mouth with the next
question, but -
Can I create my own subset of the C language with custom library functions?
(ProteanThread) wrote: "Arthur J. O'Dwyer" <aj*@nospam.and rew.cmu.edu> wrote in message
news:Pi******** *************** ***********@uni x43.andrew.cmu. edu...
You mean, what's "inside" <stdio.h>? The answer, as far as this
newsgroup is concerned (i.e., as far as the standard C language is
concerned) is: Whatever the implementor feels like. Could be completely
high-level stuff; could be lines and lines of machine-specific assembly
code; could be a bunch of Unix system calls; could be pink elephants
in tutus. We don't know what <stdio.h> "looks" like on your system, and
we don't care. You don't need to care, either, if all you're doing is
writing programs in C.
So its more compiler dependent than OS dependent?
Both. You have to differentiate between the
interface (standard) and the implementation (by
essence not standard). The interface is specified
by the C standard and the implementation is
specified by the compiler.
There are many scenarios but here`s one: the OS
implements low-level functions. You have a C
compiler targeted for your system and it comes
with a standard library. What 'targeted' means is
that its C library makes system calls to your
kernel's low-level functions. Porting that
library to another platform will probably not
work, because it is inherently platform-specific,
as the compiler is.
If your implementation is like many other implementations , you'll
actually have a text file somewhere on your hard disk called "stdio.h".
If you can find it, open it up and take a look. You'll probably find
out that it's full of arcane, basically incomprehensibl e pseudo-C with
lots of underscores in funny places. Don't ask us what it means; we
don't know. (Or rather, some of us probably do know what it all means
on /our/ systems, but may have no idea about yours --- and besides, if
we start explaining implementation internals to you, then we'll have to
explain implementation internals to everyone, and there are /hundreds/
of of implementations out there, all different. And then there wouldn't
be any room here to talk about C anymore.)
But if i were designing my own OS, can I create my own custom "stdio.h" lib
?
The header should be about the same in all
libraries, because it specifies the interface.
Bottom line: The implementation of <stdio.h> contains tygers. This
newsgroup doesn't talk about tygers. But if you have questions about
how to use <stdio.h> or the standard library functions it defines,
this is definitely the place to ask.
ok, few more questions:
1. what's a tyger?
Dunno.
2. can the standard library be redefined? (i.e. create my own standard
library?)
The standard library *must* be implemented for
your platform! It is mandatory for you to
re-implement a working library or to start one
from scratch.
3. is "stdio.h" always necessary in plain C?
What do you mean exactly? It is necessary if the
program uses declarations from that header.
I'm probably going to be sticking my foot in my mouth with the next
question, but -
Can I create my own subset of the C language with custom library functions?
Yes. For example, Visual C++ adds many extensions
to the C++ language. Just make sure you specify
somewhere what is standard and what is not (and
make sure your standard library's implementation
does not use non-standard feature, as Visual C++
does).
By the way, you should remove comp.lang.c from the
crosspost list since your questions have nothing
to do with it (read its charter).
Jonathan
In article <1110314052.a01 71dc3b7d8af5190 5c6a79ed1062c0@ teranews>,
\(ProteanThread \) <sy***@rtdos.co m> wrote:
:sorry, what I mean is "stdio.h" compiler dependent or OS dependent?
Both. In fact, it need not even be text, according to the C89 standard.
:or can
:I create my own "stdio.h" lib for my own OS ?
You could, but don't expect the result to be portable.
Within the last couple of weeks, there was a thread here in comp.lang.c
to the effect that users are "prohibitte d from trying" to redefine
any routine in the standard library. I was the lone holdout for
the interpretation that the standard didn't actually prohibit you
from trying: it just couldn't promise that anything would work
properly if you did.
--
I was very young in those days, but I was also rather dim.
-- Christopher Priest
In article <Xn************ *********@wagne r.videotron.net >,
Jonathan Mcdougall <jo************ ***@DELyahoo.ca > wrote:
:By the way, you should remove comp.lang.c from the
:crosspost list since your questions have nothing
:to do with it (read its charter).
And where exactly can that charter be found?
comp.lang.c is a rename of a news.* group. It effectively
predates charters. The corresponding news.* group did have a statement
of purpose, but you will, sad to say, get royally roasted if you
post according to that news.* statement of purpose. :(
--
Oh, to be a Blobel!
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