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From: jk@tools.de (Juergen Keil)
Newsgroups: comp.unix.solaris,comp.unix.bsd.misc
Subject: Re: Solaris 2.6
Date: 29 Nov 1996 14:25:51 GMT
Organization: TooLs GmbH, Bonn, Germany
Lines: 116
Distribution: inet
Message-ID: <JK.96Nov29152551@leo.tools.de>
References: <32986299.AC7@mail.esrin.esa.it> <57djlg$bks@agate.berkeley.edu>
<57dkbq$bsr@panix2.panix.com> <casper.329abb76@mail.fwi.uva.nl>
<57ej3a$7ij@panix2.panix.com> <casper.329ae8f2@mail.fwi.uva.nl>
<57hhcp$kp9@innocence.interface-business.de>
NNTP-Posting-Host: leo.tools.de
In-reply-to: j@ida.interface-business.de's message of 27 Nov 1996 13:57:45 GMT
Xref: euryale.cc.adfa.oz.au comp.unix.solaris:90938 comp.unix.bsd.misc:1631
In article <57hhcp$kp9@innocence.interface-business.de> j@ida.interface-business.de (J Wunsch) writes:
> It's funny that you're arguing a hypothetical case, while people
> who've been gone through all this already tell you _that it simply
> works for us_, ain't it?
>
> Anyway:
>
> j@ida 608% cat foo.c
> #include <unistd.h>
> #include <fcntl.h>
... bogus example deleted ...
Here's a small modification for your program (the _startup_setlocale
is for FreeBSD 2.0's crt0 which references a libc routine that is not
present in the older libc.so.1.1):
1% diff -c foo-orig.c foo.c
*** foo-orig.c Fri Nov 29 14:21:22 1996
--- foo.c Fri Nov 29 14:12:59 1996
***************
*** 14,22 ****
if ((fd = open("foobar", O_RDWR|O_CREAT, 0666)) == -1)
return 1;
write(fd, s, sizeof s - 1);
! lseek(fd, 6, SEEK_SET);
x = read(fd, b, 200);
write(1, b, x);
return 0;
}
--- 14,24 ----
if ((fd = open("foobar", O_RDWR|O_CREAT, 0666)) == -1)
return 1;
write(fd, s, sizeof s - 1);
! lseek(fd, -7, SEEK_END);
x = read(fd, b, 200);
write(1, b, x);
return 0;
}
+
+ _startup_setlocale(){}
2% cat foo.c
#include <unistd.h>
#include <fcntl.h>
char s[] = "Hello\nworld!\n";
int
main(void)
{
int fd;
off_t o;
ssize_t x;
char b[200];
if ((fd = open("foobar", O_RDWR|O_CREAT, 0666)) == -1)
return 1;
write(fd, s, sizeof s - 1);
lseek(fd, -7, SEEK_END);
x = read(fd, b, 200);
write(1, b, x);
return 0;
}
_startup_setlocale(){}
3% cc -c foo.c
4% ld -e start -dc -dp -o foo /usr/lib/crt0.o foo.o -lc /usr/lib/libgcc.a
5% ldd foo
foo:
-lc.2 => /usr/lib/libc.so.2.0 (0x1001a000)
6% rm foobar
7% ./foo
world!
8% ld -e start -dc -dp -o foo /usr/lib/crt0.o foo.o /usr/lib/libc.so.1.1 /usr/lib/libgcc.a
9% ldd foo
foo:
/usr/lib/libc.so.1.1 => /usr/lib/libc.so.1.1 (0x10019000)
10% rm foobar
11% ./foo
12% ktrace ./foo
13% kdump | tail -20
12833 foo CALL open
12833 foo NAMI "foobar"
12833 foo RET open 3
12833 foo CALL write
12833 foo GIO fd 3 wrote 13 bytes
"Hello
world!
"
12833 foo RET write 13/0xd
12833 foo CALL old.lseek
12833 foo RET old.lseek -1 errno 22 Invalid argument
12833 foo CALL read
12833 foo GIO fd 3 read 0 bytes
""
12833 foo RET read 0
12833 foo CALL write
12833 foo GIO fd 1 wrote 0 bytes
""
12833 foo RET write 0
12833 foo CALL exit
14%
> With either the new or the old shared lib, it works.
Your code example worked only by chance.
--
Juergen Keil jk@tools.de ...!{uunet,mcsun}!unido!tools!jk