Re: Bad file descriptor with pipeline

[Hédy GIRAUDEAU]

Le 12/04/2016 04:00, Chet Ramey a écrit :
> On 4/11/16 5:39 PM, Hédy GIRAUDEAU wrote:
>> Hi,
>> If i use : `strace bash -c "echo qsd | cat" 2>&1 | grep "close"`
>> I get systematically :
>>
>> close(3)                                = 0
>> close(3)                                = 0
>> close(3)                                = 0
>> close(3)                                = 0
>> close(3)                                = 0
>> close(3)                                = 0
>> close(3)                                = 0
>> close(3)                                = 0
>> close(4)                                = 0
>> close(4)                                = -1 EBADF (Bad file descriptor)
>> close(3)                                = 0
>> close(3)                                = -1 EBADF (Bad file descriptor)
>>
>>
>> I don't know if it's a bug or not. This error happens everytime a
>> pipeline is used.
> It's not a bug, it's bash making sure pipe file descriptors are closed.
>

Oh ok.
That's a odd way to make sure that a file descriptor is closed but at
least it works.
Sorry for disturbing.