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Date: Tue, 23 Sep 2014 16:52:57 -0300
Message-ID: <CAHAq8pEWtSZ8F7bF=4-r2YSQmYnnYL0tcFuMp7gOW-va2g4=mg@mail.gmail.com>
Subject: Re: problem with dlsym to fetch address of some functions
From: =?UTF-8?Q?Paulo_C=C3=A9sar_Pereira_de_Andrade?= <paulo DOT cesar DOT pereira DOT de DOT andrade AT gmail DOT com>
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2014-09-23 16:40 GMT-03:00 Marco Atzeri <marco DOT atzeri AT gmail DOT com>:
> On 23/09/2014 20:43, Paulo César Pereira de Andrade wrote:
>>
>>    Hi,
>>
>>    Forgive me if this is expected. I am probably abusing dlsym
>> behavior on other systems.
>
>
> It will be much more clear if you

  Sorry for not clear initial problem description.

> 1) produce a simple small complete test case,

$ cat x.c
extern int sprintf(char*,char*, ...);
extern int puts(char*);
extern void *dlsym(void*, char*);
char buff[128];
int main(void) {
int (*fn)(char*,char*,...);
sprintf(buff, "%.1f", 1.0);
puts(buff);
fn = dlsym((void*)0, "sprintf");
(*fn)(buff, "%.1f", 1.0);
puts(buff);
return 0;
}

$ gcc -O0 -g3 x.c

> 2) explain the outcome you obtain (or not)

$ ./a.exe
1.0
f

> 3) explain the result you are expecting.

The expected result would be:

$ ./a.exe
1.0
1.0

> I had difficulties to understand what you are asking us.
>
> Marco

Thanks,
Paulo

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