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clytle374
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Joined: 01 Aug 2006
Posts: 226
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 Posted: Fri May 09, 2025 9:43 pm Post subject: Issue with permissions to /dev/ttyUSB0, yes I'm in the group |
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Problem only exists when not logged in as root. I'm trying to run a program called uTmax that interfaces with a curve tracer board for vacuum tubes called a utracer.
I've had such problems before with not being in the correct group. Or a driver issue which being root doesn't fix. Any suggestions?
| Code: | ls -la /dev/ttyU*
crw-rw----+ 1 root plugdev 188, 0 May 9 17:07 /dev/ttyUSB0 |
| Code: | cory@workbench ~ $ groups
wheel audio video docker usb portage plugdev vboxusers cory |
I'm using a USB to RS232 converter I've used a lot on other devices, it's not a cheap clone.
| Code: | Bus 002 Device 003: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
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The program does rely on the package dev-qt/qtserialport-6.8.3 if that matters. Lots of references to rfcomm which I can't find data on.
Here is the output of the program
| Code: | Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
qt.core.qmetaobject.connectslotsbyname: QMetaObject::connectSlotsByName: No matching signal for on_TLsort_changed()
SerialPortDiscovery: comport= "rfcomm0" available= "ttyUSB0"
SerialPortDiscovery: comport= "rfcomm0" available= "ttyS0"
SerialPortDiscovery: comport= "rfcomm0" available= "ttyS1"
SerialPortDiscovery: comport= "rfcomm0" available= "ttyS2"
SerialPortDiscovery: comport= "rfcomm0" available= "ttyS3"
setting serPortInfo, comport: "ttyUSB0" "rfcomm0"
setting serPortInfo, comport: "ttyS0" "rfcomm0"
setting serPortInfo, comport: "ttyS1" "rfcomm0"
setting serPortInfo, comport: "ttyS2" "rfcomm0"
setting serPortInfo, comport: "ttyS3" "rfcomm0"
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When ran as root, I get the same thing that ends with connected.
| Code: | Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
qt.core.qmetaobject.connectslotsbyname: QMetaObject::connectSlotsByName: No matching signal for on_TLsort_changed()
QIODevice::write (QFile, "/root/uTmax_files/cal.txt"): device not open
SerialPortDiscovery: comport= "" available= "ttyUSB0"
SerialPortDiscovery: comport= "" available= "ttyS0"
SerialPortDiscovery: comport= "" available= "ttyS1"
SerialPortDiscovery: comport= "" available= "ttyS2"
SerialPortDiscovery: comport= "" available= "ttyS3"
setting serPortInfo, comport: "ttyUSB0" ""
setting serPortInfo, comport: "ttyS0" ""
setting serPortInfo, comport: "ttyS1" ""
setting serPortInfo, comport: "ttyS2" ""
setting serPortInfo, comport: "ttyS3" ""
Open "ttyUSB0"
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bstaletic
Guru
Joined: 05 Apr 2014
Posts: 506
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| Posted: Sat May 10, 2025 11:12 am Post subject: |
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Were you in the plugdev group before you logged into your computer?
If not, you'll have to log out everywhere and log in again, or restart. |
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GDH-gentoo
Veteran
Joined: 20 Jul 2019
Posts: 1875
Location: South America
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| Posted: Sat May 10, 2025 11:35 am Post subject: Re: Issue with permissions to /dev/ttyUSB0 |
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| clytle374 wrote: | | Code: | ls -la /dev/ttyU*
crw-rw----+ 1 root plugdev 188, 0 May 9 17:07 /dev/ttyUSB0 |
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Note that there is a "+" in the output. There's probably an access control list (ACL), so ls is not telling the full story. Post the output of getfacl /dev/ttyUSB0.
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| Ionen wrote: | | As a packager I just don't want things to get messier with weird build systems and multiple toolchains requirements though |
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clytle374
Apprentice
Joined: 01 Aug 2006
Posts: 226
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| Posted: Sat May 10, 2025 1:46 pm Post subject: Re: Issue with permissions to /dev/ttyUSB0 |
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| bstaletic wrote: | Were you in the plugdev group before you logged into your computer?
If not, you'll have to log out everywhere and log in again, or restart. |
Yes, I even rebooted to be sure.
| GDH-gentoo wrote: | | clytle374 wrote: | | Code: | ls -la /dev/ttyU*
crw-rw----+ 1 root plugdev 188, 0 May 9 17:07 /dev/ttyUSB0 |
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Note that there is a "+" in the output. There's probably an access control list (ACL), so ls is not telling the full story. Post the output of getfacl /dev/ttyUSB0. |
Interesting, that's new territory to me. Here's the output
| Code: | getfacl /dev/ttyUSB0
getfacl: Removing leading '/' from absolute path names
# file: dev/ttyUSB0
# owner: root
# group: plugdev
user::rw-
user:cory:rw-
group::rw-
mask::rw-
other::---
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 23405
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| Posted: Sat May 10, 2025 2:21 pm Post subject: |
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| What does strace report to be failing? If we knew specifically which system call fails for your user, we might better understand what to fix. |
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clytle374
Apprentice
Joined: 01 Aug 2006
Posts: 226
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| Posted: Sat May 10, 2025 2:53 pm Post subject: |
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| Hu wrote: | | What does strace report to be failing? If we knew specifically which system call fails for your user, we might better understand what to fix. |
I'm not knowledgeable in the use of strace. It completely overruns the 10000 lines in the buffer in seconds. After a quick search I tried the following options without effect.
| Code: | | strace ./do_not_run_uTmax -e trace=/dev/ttyUSB0 |
| Code: | | strace ./do_not_run_uTmax -P /dev/ttyUSB0 |
Obviously I don't know what I'm doing there.
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bstaletic
Guru
Joined: 05 Apr 2014
Posts: 506
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| Posted: Sat May 10, 2025 3:03 pm Post subject: |
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Try | Code: | | strace -o output.log ./do_not_run_uTmax -e trace=/dev/ttyUSB0 |
and then upload the output.log somewhere for us. |
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clytle374
Apprentice
Joined: 01 Aug 2006
Posts: 226
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| Posted: Sat May 10, 2025 3:37 pm Post subject: |
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| bstaletic wrote: | Try | Code: | | strace -o output.log ./do_not_run_uTmax -e trace=/dev/ttyUSB0 |
and then upload the output.log somewhere for us. |
https://drive.google.com/file/d/1ZzCn73UhwnaW5NDTB64RGrpIeWdpcHxb/view?usp=sharing
I might really have a problem here. I didn't realize that using the do_not_run was skipping setting a path to local libs. It will not run using them at all. I found the source code to the program and will try that later if all else fails
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