Date: Mon, 23 Feb 1998 04:12:05 +0700 (ICT) From: Sunthiti Patchararungruang <stt@TCP> To: hackers@FreeBSD.ORG Subject: Re: Signal 11 problem Message-ID: <Pine.BSF.3.96.980223040539.19496C-100000@pluto.cpe.ku.ac.th> In-Reply-To: <199802221942.LAA08014@dingo.cdrom.com>
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On Sun, 22 Feb 1998, Mike Smith wrote:
> > Dear Everybody,
>
>
> > I have written a C program which has a function that need 10
> > arguments. I cannot run this program because the signal-11 occured when I
> > call this function. However, when I reduce the number of arguments the
> > program can be executed without error. I tried to change eliminated
> > arguments to check which one causes the error but the program still
> > completely operate. Therefore, I conclude that the problem come from stack
> > management in FreeBSD. What should I do?
>
> Debug your program. Oddly enough, there are lots of people using
> FreeBSD, and innumerable functions taking more than 10 arguments.
>
> Your conclusion is bogus; did you really believe that in all these
> years, nobody had ever tried this before?
>
> You should start by applying the debugger (gdb) to your program and the
> core file produced when it crashes. If you build your program with the
> '-g' flag you will be able to determine the source line on which the
> fault occurs. (This may not be the location of the bug itself, of
> course.)
>
Sorry about my useless example. Here is the real problem. I cut it
from wu-ftpd 2.4. All variables are proved to be correct. I use
FreeBSD2.2.5.
sprintf(msg, "%.24s %d %s %d %s %c %s %c %c %s ftp %d %s\n",
ctime(&curtime),
xfertime,
remotehost,
byte_count,
namebuf,
(type == TYPE_A) ? 'a' : 'b',
opt_string(options),
'o',
anonymous ? 'a' : 'r',
anonymous ? guestpw : pw->pw_name,
authenticated,
authenticated ? authuser : "*"
);
However, if I rewrite it as the following, the program now
operates correctly.
sprintf(tmsg, "%.24s %d %s %d\n",
ctime(&curtime),
xfertime,
remotehost,
byte_count
);
strcat (tmsg, namebuf);
sprintf(msg, "%s %c %s %c %c %s ftp %d %s\n",
tmsg,
(type == TYPE_A) ? 'a' : 'b',
opt_string(options),
'o',
anonymous ? 'a' : 'r',
anonymous ? guestpw : pw->pw_name,
authenticated,
authenticated ? authuser : "*"
);
Best Regards,
Sunthiti Patchararungruang
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