Re: executing gvim from within a C program

Le 13/05/2020 à 22:33, Tony Mechelynck a écrit :
> 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.
>
Thanks a lot, Tony ; that was the solution ; yet gvim is launched (after
6 seconds ???), and parent program waits till gvim is closed.

Just a little thing : this child instance of gvim does not read my
.vimrc unless I ad "-u /myHome/.vimrc"

And if I add "-u /myHome/.vimrc" and do "Edition - startup setting", it
says "new file .vimrc"

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