fork() vs vfork()

fork() vs vfork()

[kjlin]

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Hi all,

How does linux-mips treat the vfork() function?
I can see the fork() implemented in syscall.c as following:

save_static_function(sys_fork);
static_unused int _sys_fork(struct pt_regs regs)
{
        int res;
        res = do_fork(SIGCHLD, regs.regs[29], &regs, 0);
        return res;
}

But i can't see anything about vfork/sys_vfork in mips platform.
However, the vfork() was implemented as sys_vfork in other architecture.
Such as arm platform:
asmlinkage int sys_vfork(struct pt_regs *regs)
{
        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0);
}

Why not do the same "sys_vfork" in linux-mips?
Does it mean that MIPS does not support vfork() or vfork() is equal to fork() in MIPS platform?

Thanks,
KJ



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fork() vs vfork()

[kjlin]

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Hi all,

How does linux-mips treat the vfork() function?
I can see the fork() implemented in syscall.c as following:

save_static_function(sys_fork);
static_unused int _sys_fork(struct pt_regs regs)
{
        int res;
        res = do_fork(SIGCHLD, regs.regs[29], &regs, 0);
        return res;
}

But i can't see anything about vfork/sys_vfork in mips platform.
However, the vfork() was implemented as sys_vfork in other architecture.
Such as arm platform:
asmlinkage int sys_vfork(struct pt_regs *regs)
{
        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0);
}

Why not do the same "sys_vfork" in linux-mips?
Does it mean that MIPS does not support vfork() or vfork() is equal to fork() in MIPS platform?

Thanks,
KJ



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Re: fork() vs vfork()

[Ralf Baechle]

On Thu, Sep 20, 2001 at 02:51:08PM +0800, kjlin wrote:
> From: "kjlin" <kj.lin@viditec-netmedia.com.tw>
> To: <linux-mips@oss.sgi.com>
> Subject: fork() vs vfork()
> Date: Thu, 20 Sep 2001 14:51:08 +0800
> 
> Hi all,
> 
> How does linux-mips treat the vfork() function?
> I can see the fork() implemented in syscall.c as following:
> 
> save_static_function(sys_fork);
> static_unused int _sys_fork(struct pt_regs regs)
> {
>         int res;
>         res = do_fork(SIGCHLD, regs.regs[29], &regs, 0);
>         return res;
> }

> Why not do the same "sys_vfork" in linux-mips?
> Does it mean that MIPS does not support vfork() or vfork() is equal to fork() in MIPS platform?

Hint: save_static_function is a macro.

  Ralf