Date: Wed, 9 Dec 1998 19:48:06 +0100 (CET) From: cejkar@dcse.fee.vutbr.cz To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/9035: Bad __progname content in ELF programs Message-ID: <199812091848.TAA18006@kazi.dcse.fee.vutbr.cz>
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>Number: 9035
>Category: bin
>Synopsis: Bad __progname content in ELF programs
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Dec 9 10:50:00 PST 1998
>Last-Modified:
>Originator: Rudolf Cejka
>Organization:
FEE TU Brno, Czech Republic
>Release: FreeBSD 3.0-CURRENT i386
>Environment:
ELFoized current -current :-) [YY-MM-DD: 98-12-09]
>Description:
For aout programs, __progname variable contains only program name.
For ELF programs, __progname variable contains program name
with full path (i386 & alpha).
(
There must be something wrong. If this difference is right you must
fix at least manpage for err*()/warn*() or err*()/warn*() itself:
... In all cases, the last component of the program name,
a colon character, and a space are output ...
... Which for ELF programs at this time doen't apply.
)
>How-To-Repeat:
Simple program test.c:
#include <stdio.h>
extern char *__progname;
int main(void)
{
printf("%s\n", __progname);
return 0;
}
gives there results:
# gcc -aout -o test test.c
# ./././test
test
# gcc -elf -o test test.c
# ./././test
./././test
>Fix:
Patch is taken from /usr/src/lib/csu/i386/crt0.c. It isn't tested
so you must review my patch!
patch /usr/src/lib/csu/i386-elf/crt1.c:
(You need similar patch for /usr/src/lib/csu/alpha/crt1.c!)
--- crt1.c Wed Sep 9 10:11:21 1998
+++ /tmp/crt1.c.new Wed Dec 9 19:43:17 1998
@@ -72,8 +72,13 @@
argc = * (int *) (argv - 1);
env = argv + argc + 1;
environ = env;
- if(argc > 0)
+ if(argc > 0 && argv[0]) {
+ register char *s;
__progname = argv[0];
+ for (s = __progname; *s != '\0'; s++)
+ if (*s == '/')
+ __progname = s + 1;
+ }
if(&_DYNAMIC != 0)
atexit(rtld_cleanup);
--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--
Rudolf Cejka (cejkar@dcse.fee.vutbr.cz; http://www.fee.vutbr.cz/~cejkar)
Technical University of Brno, Faculty of El. Engineering and Comp. Science
Bozetechova 2, 612 66 Brno, Czech Republic
>Audit-Trail:
>Unformatted:
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