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Date: Fri, 14 May 2010 16:54:36 +0800
Message-ID: <AANLkTikoAoUAarNLwuIHe6GypKg62rjKR1VPyQYygT17@mail.gmail.com>
Subject: Re: vfork always fail problem
From: Huang Bambo <bambo DOT huang AT gmail DOT com>
To: cygwin AT cygwin DOT com
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I's the problem of the fork() pass a wrong program path to CreateProcessW.

It shoud pass a GBK code pathname to CreateProcessW but if I set
 LANG=3Den_US.UTF-8, the pathname passed to CreateProcessW is UTF-8, so
CreateProcessW report file not found.


2010/5/14 Matthias Andree <matthias DOT andree AT gmx DOT de>:
> Am 14.05.2010, 06:29 Uhr, schrieb Huang Bambo:
>
>> [Bambo AT bambo-notebook 4.4.4]$ cat tvfork.c
>> #include <sys/types.h>
>> #include <unistd.h>
>> #include <stdio.h>
>>
>> int main(void)
>> {
>> =A0 =A0 =A0 =A0pid_t pid =3D vfork();
>> =A0 =A0 =A0 =A0if ( pid > 0 )
>> =A0 =A0 =A0 =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("I'm chield.\n");
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0_exit(0);
>> =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0else if ( pid =3D=3D 0 )
>> =A0 =A0 =A0 =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("I'm parent");
>> =A0 =A0 =A0 =A0}
>
> You've got these swapped. pid =3D=3D 0 means child, > 0 means parent (so =
that it
> directly has the PID of its child and can later call waitpid()).
>
> You later wrote you've issues with the path; does the same happen if you =
use
> "fork" rather than "vfork"? =A0vfork()ed child processes must not do anyt=
hing
> but modify a variable of type pid_t, call _exit() or exec*().
>
> --
> Matthias Andree
>
> --
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