Hey Thomas!

Thanks a lot for your input! You are totally right, I could have checked this myself. Works like a charm with screen. So I suppose I'll go with that solution - fantastic - also your script is very helpful! Kudos!

Cheers
Jan


Am 2019-04-25 15:41, schrieb Thomas Brand:

On 2019-04-25 12:39, jack@microfx.de wrote:

Hey Thomas,

systemctl --version
systemd 232
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP
+LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS
+KMOD +IDN

From that issue thread I see it's only in 240 - so this is not the
problem I suppose.

Cheers
Jan


Am 2019-04-25 12:33, schrieb Thomas Brand:

On 2019-04-25 11:35, jack@microfx.de wrote:

Hey!

I have a hard time setting up a tmux session started with systemd on
raspbian (patchbox OS, realtime kernel) to behaves like as if I
started my script manually.

Cannot use real-time scheduling (RR/70)(1: Operation not permitted)
JackClient::AcquireSelfRealTime error

It's yet unclear to me if this is related to jack at all.. Can you
test this without jack? Basically leaving everything out except a
script started by systemd that tries to lock memory or calls ulimit.

Similar to your tmux approach, with screen, here's a building block:

#!/bin/bash

start_in_detached_screen()
{
        #$1: username
        #$2: screen name
        #$3: command string (without ^M)

        su ${1} -c "screen -d -m -S \"$2\""
        su ${1} -c "screen -S \"$2\" -p 0 -X stuff \"$3\"^M"
}

start_in_detached_screen john_doe "my test" "cd /tmp && ls -ltra"

-> as root: start screen as given user and feed command to screen session.
It should work to start jackd as a specific user early in the boot
process and see what happened by attaching the screen later on.

Greetings
Thomas

If it is a Users permission issue, you could do it with systemd by using the XDG_RUNTIME_DIR var.

ExecStart=/home/patch/jack-capture-tmux.sh

were you need to set your username and id (id -u $(logname))

this will start the script with the permissions set for the user.