NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/std/c/122

Text File | 1996-08-06 | 1.2 KB | 39 lines

Path: lyra.csx.cam.ac.uk!nmm1
From: [e-mail] (Nick Maclaren)
Newsgroups: comp.std.c
Subject: Re: atexit() and return from main()
Date: 17 Jan 1996 10:17:52 GMT
Organization: University of Cambridge, England
Message-ID: <4diicg$[e-mail]>
References: <4dhfja$[e-mail]>
NNTP-Posting-Host: ursa.cus.cam.ac.uk

In article <4dhfja$[e-mail]>, [e-mail] (Thomas Koenig) writes:
|> Is the following valid C?  [ NMM is to blame for the style! ]
|>
|> char *a;
|> void printit() { printf("%s",a); }
|>
|> int main() {
|>     char buffer[]="Hello, world!\n";
|>     a = buffer;
|>     atexit(printit);
|>     return 0;
|> }
|>
|> 6.1.2.4 tells me it isn't, but 5.1.2.2.3 tells me that a return
|> from the initial call to main() is equivalent to an exit(), and
|> I don't see a problem when I replace the 'return 0' above with
|> an 'exit(0)'.

I do.  exit() may unwind the stack before calling the atexit()
functions, and that is actually the way that most C run-time
systems implement close down.


Nick Maclaren,
University of Cambridge Computer Laboratory,
New Museums Site, Pembroke Street, Cambridge CB2 3QG, England.
Email:  [e-mail]
Tel.:  [phone]    Fax:  [phone]