Date: Thu, 18 Jan 2001 13:32:37 -0800 (PST) From: =?ISO-8859-1?Q?Mikko_Ty=F6l=E4j=E4rvi?= <mikko@dynas.se> To: Michal Zapasnik <bigstar@astercity.net> Cc: freebsd-questions@freebsd.org Subject: Re: System functions in BSD and others *nix systems. Message-ID: <Pine.BSF.4.21.0101181326190.40739-100000@explorer.rsa.com> In-Reply-To: <Pine.BSF.4.21.0101182219430.1262-100000@BS.home.astercity.net>
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On Thu, 18 Jan 2001, Michal Zapasnik wrote:
> On Thu, 18 Jan 2001, Mikko Tyolajarvi wrote:
>
[...]
> > You don't check the return values of any of the msg* function calls,
> > which may have failed for various reasons. If you do that, you may be
> > able to find out what is going wrong.
> >
> I do as you say ,
> [...]
> if (msgrcv(q, &msg, sizeof(msg), 0, 0) == -1)
> {
> perror("msgrcv");
> exit(0);
> }
>
> And i have
> msgrcv: Invalid argument
>
> I check in manual that is the flag [EINVAL]
> 'msqid is not a valid message queue identifier.'
>
> But if why it work on other OS and on FBSD not?, and what is vaild
> in my queue identifer.
Which obviously then caused you to check the return value of msgget(),
right? :-) Do it.
The problem could be any one of the stupid limits associated with
System V IPCs (a really tragic piece of engineering...), or, more
likelty as you are using ftok(), the path to the file in ftok() is
wrong. Or maybe you are running with a kernel without SysV IPCs.
Just for the hell of it, I compiled your code and ran it. Works as
expected (bunch of fives). This is on FreeBSD 4.2. But I did change
the pathname used with ftok() first...
/Mikko
Mikko Työläjärvi_______________________________________mikko@rsasecurity.com
RSA Security
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