Re: executing gvim from within a C program

On Wed, May 13, 2020 at 10:28 PM Lucien Gentis <lucien.gentis@waika9.com> wrote:
>
> Hello,
>
> Distro : Debian 10 - 64bits
>
> I think it's the right list ; if not, please redirect me.

It is.
>
> In order to launch a command from within the C programme in attachment, I use "fork - execve - wait" trio so that parent program waits until command has finished
>
> Building the program : cc execve.c -o execve
>
> Program syntax : ./execve <command full path>
>
> Example : ./execve /usr/bin/gvim
>
> The problem :
>
> --- if I execute "./execve /usr/bin/gvim", gvim starts after a few seconds but without executing .vimrc, and parent program doesn't wait for gvim to end.
>
> Output of "ps -auwx --forest" during the few wait seconds :
>
> lgentis 5216 0.0 0.0 7124 3812 pts/0 Ss 14:47 0:00 \_ bash
> lgentis 9368 0.0 0.0 2144 752 pts/0 S+ 16:44 0:00 | \_ ./execve /usr/bin/gvim
> lgentis 9369 2.0 0.2 68916 16452 pts/0 S+ 16:44 0:00 | \_ gvim
> lgentis 9392 2.5 0.3 71620 22444 ? Ss 16:44 0:00 | \_ gvim
>
> Output of "ps -auwx --forest" once gvim started :
>
> lgentis 5212 0.1 0.7 426212 43880 ? Rl 14:47 0:07 xfce4-terminal
> lgentis 5216 0.0 0.0 7124 3812 pts/0 Ss+ 14:47 0:00 \_ bash
> lgentis 9093 1.3 0.4 75804 26700 ? Ss 16:36 0:00 gvim
>
> We can see that gvim is not a child process of the parent program (which has ended)

see :help -f

>
> --- if I execute "./execve /usr/bin/vim.gtk", vim starts in text mode in the console ; however, parent program waits till vim is closed.
>
> Output of "ps -auwx --forest" :
>
> lgentis 5212 0.0 0.7 426212 43880 ? Rl 14:47 0:06 xfce4-terminal
> lgentis 5216 0.0 0.0 7124 3812 pts/0 Ss 14:47 0:00 \_ bash
> lgentis 9011 0.0 0.0 2144 748 pts/0 S+ 16:34 0:00 | \_ ./execve /usr/bin/vim.gtk
> lgentis 9012 0.8 0.2 68932 17232 pts/0 S+ 16:34 0:00 | \_ vim.gtk
>
> We can see that vim.gtk is a child process of the parent program
>
> --- I did the same test with gedit and audacious, and all works fine : child program is executed and parent program waits as expected.
>
> Output of "ps -auwx --forest" :
>
> lgentis 5212 0.0 0.7 425664 43548 ? Sl 14:47 0:05 xfce4-terminal
> lgentis 5216 0.0 0.0 7124 3812 pts/0 Ss 14:47 0:00 \_ bash
> lgentis 8910 0.0 0.0 2144 748 pts/0 S+ 16:30 0:00 | \_ ./execve /usr/bin/gedit
> lgentis 8911 4.2 0.7 477720 47812 pts/0 Sl+ 16:30 0:00 | \_ gedit
>
> We can see that gedit is a child process of the parent program



Best regards,
Tony.

--
--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php

---
You received this message because you are subscribed to the Google Groups "vim_use" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vim_use+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/vim_use/CAJkCKXt4s3BQ60Rj0byX8OpSEMVKm-d6r8Be0wGKmGzcP%2BKn7A%40mail.gmail.com.