Public bug reported:
lsdvb crashes if the device is in use (for example by tvheadend).
Problem is the file mode. `O_RDWR` is not needed, `O_RDONLY` is enough.
Original output (actual):
```
$ lsdvb
lsdvb: Simple utility to list PCI/PCIe DVB devices
Version: 0.0.4
Copyright (C) Manu Abraham
em28xx (632515409:0 0:1) on PCI Domain:31888 Bus:-818575984 Device:31888
Function:-818390219
DEVICE:0 ADAPTER:0 ERROR: Open frontend0 failed
```
Expected output (with patch):
```
$ lsdvb
lsdvb: Simple utility to list PCI/PCIe DVB devices
Version: 0.0.4
Copyright (C) Manu Abraham
em28xx (-633244093:0 0:1) on PCI Domain:32354 Bus:-2121079408 Device:32354
Function:-2120893643
DEVICE:0 ADAPTER:0 FRONTEND:0 (Silicon Labs Si2168)
FE_QAM Fmin=48MHz Fmax=870MHz
DEVICE:0 ADAPTER:1 FRONTEND:0 (Silicon Labs Si2168)
FE_QAM Fmin=48MHz Fmax=870MHz
```
patch:
```
--- linuxtv-dvb-apps-1.1.1+rev1500/util/lsdvb/lsdvb.c_orig 2025-11-08
23:01:10.000484848 +0000
+++ linuxtv-dvb-apps-1.1.1+rev1500/util/lsdvb/lsdvb.c 2025-11-08
23:04:33.941737821 +0000
@@ -290,7 +290,7 @@
get_frontend_info(adapter, frontend);
sprintf(fedev, "%s/adapter%d/%s", DVB_DIR, adapter, frontend);
- fd = open(fedev, O_RDWR | O_NONBLOCK);
+ fd = open(fedev, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
fprintf(stderr, "ERROR: Open %s failed\n", frontend);
return -1;
```
Ubuntu 24.04,
Package: dvb-apps
Architecture: amd64
Version: 1.1.1+rev1500-1.4build3
** Affects: linuxtv-dvb-apps (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2130961
Title:
lsdvb crashes if device is in use
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