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From: nickkral@sextans.EECS.Berkeley.EDU (Nick Kralevich)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: porting Linux apps to BSD !
Date: 23 Aug 1995 20:52:08 GMT
Organization: Electrical Engineering Computer Science Department, University of California at Berkeley
Lines: 43
Message-ID: <41g4do$3cq@agate.berkeley.edu>
References: <aak2.808728796@Ra.MsState.Edu> <41dkk4$fbn@news.rwth-aachen.de> <41epcd$bn4@agate.berkeley.edu> <41fkii$8mo@news.rwth-aachen.de>
NNTP-Posting-Host: sextans.eecs.berkeley.edu
In article <41fkii$8mo@news.rwth-aachen.de>,
Guido Muesch <odiug@gom.informatik.rwth-aachen.de> wrote:
>Under Linux it does nothing.
>(Kernel 1.2.8, a.out binaries, libc 4.5.21 I think).
It could be the library version (which seems sorta old). I've heard
a report that one of the early versions of ELF had a problem with not
unmapping the zero page. But that problem has either been fixed, or is
in the process of being fixed.
Here's the specific test that you ran:
----- Begin -----
caa32:~/tmp> cat foo.c
#include <stdio.h>
#include <string.h>
main() {
char * foo = NULL;
char * bar = NULL;
strcmp (foo, bar);
}
caa32:~/tmp> gcc foo.c -o foo
caa32:~/tmp> uname -a
Linux caa32 1.2.13 #3 Wed Aug 9 11:53:18 PDT 1995 i586
caa32:~/tmp> uptime
1:53pm up 13 days, 20:41, 2 users, load average: 0.00, 0.00, 0.00
caa32:~/tmp> gcc -v
Reading specs from /usr/lib/gcc-lib/i486-linux/2.6.3/specs
gcc version 2.6.3
caa32:~/tmp> ldd ./foo
libc.so.4 (DLL Jump 4.6pl27) => /lib/libc.so.4.6.27
caa32:~/tmp> file ./foo
./foo: Linux/i386 demand-paged executable (QMAGIC) not stripped
caa32:~/tmp> ./foo
Segmentation fault
----- End -----
Take care,
-- Nick Kralevich
nickkral@cory.eecs.berkeley.edu