Re: [libmicrohttpd] MHD_create_response_from_fd using a pipe

[Denis Dowling]

Hi Christian,

The manual page for popen is fairly explicit that pclose() must be used to 
close the FILE returned from popen(). The pclose() call does some extra process 
cleanup steps. I cannot see another way of doing this except using a hybrid of 
MHD_create_response_from_callback and MHD_create_reponse_from_fd().

Regards,
Denis

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Christian Grothoff
Sent: Wednesday, 3 June 2015 3:58 PM
To: address@hidden
Subject: Re: [libmicrohttpd] MHD_create_response_from_fd using a pipe



On 06/03/2015 03:44 AM, Denis Dowling wrote:
> Then in my code when I want to return data from a process I do
> something like
>
>     FILE *pf = popen(cmd, "r");
>     int fd = fileno(pf);
>
>     response = MHD_create_response_from_callback_fd(-1, 4096,
> &popen_reader,  pf, &popen_free, fd);

Just do

int fd = dup (fileno (pf));
fclose (pf);
response = MHD_create_response_from_callback_fd(-1, 4096, &popen_reader,  pf, 
&popen_free, fd);

and you can avoid the awkward popen_free().

Happy hacking!

-Christian


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