From mboxrd@z Thu Jan  1 00:00:00 1970
From: mulyadi.santosa@gmail.com (Mulyadi Santosa)
Date: Sun, 15 Jul 2012 12:49:25 +0700
Subject: [RFC]confusion about syscall
In-Reply-To: <CAJrRU3WEitdr+376gsT=JP_BOpQvv_+JoUAS8Lxd6J1gG9-p0g@mail.gmail.com>
References: <CAJrRU3WEitdr+376gsT=JP_BOpQvv_+JoUAS8Lxd6J1gG9-p0g@mail.gmail.com>
Message-ID: <CAGdaadZoeYT_oK2nRXzpAbV8GD38z7Q9N-8toRHVSm8ejbXCqQ@mail.gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi...

On Sun, Jul 15, 2012 at 9:28 AM, ?? <wangzhe5004@gmail.com> wrote:
> and the second program:
>
> #include <stdio.h>
> #include <unistd.h>
>
> int main(void)
> {
>     unsigned long value = 0;
>     value = getpid();
>     return 0;
> }
>
> and disassembling it:( objdump -d a.out)
> ...
> 08048300 <getpid@plt>:
>  8048300:    ff 25 00 a0 04 08        jmp    *0x804a000
>  8048306:    68 00 00 00 00           push   $0x0
>  804830b:    e9 e0 ff ff ff           jmp    80482f0 <_init+0x3c>

Looks like jumping into vsyscall page to me...

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
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