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Fix stdout buffering: use PYTHONUNBUFFERED for grgsm_scanner

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grgsm_scanner is a Python/GNU Radio script, so stdbuf has no effect.
Setting PYTHONUNBUFFERED=1 in the subprocess env forces Python to
flush stdout on every write, enabling real-time scan output.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-08 16:36:13 +00:00
parent 3f254b1e41
commit 884f768f2a
1 changed files with 4 additions and 4 deletions
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routes/gsm_spy.py
+4 -4
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@@ -373,9 +373,7 @@ def start_scanner():
return jsonify({'error': 'grgsm_scanner not found. Please install gr-gsm.'}), 500 return jsonify({'error': 'grgsm_scanner not found. Please install gr-gsm.'}), 500
try: try:
# Use stdbuf to force line-buffered stdout - grgsm_scanner cmd = ['grgsm_scanner']
# fully buffers stdout when piped, preventing real-time output
cmd = ['stdbuf', '-oL', 'grgsm_scanner']
# Add device argument (--args for RTL-SDR device selection) # Add device argument (--args for RTL-SDR device selection)
cmd.extend(['--args', f'rtl={device_index}']) cmd.extend(['--args', f'rtl={device_index}'])
@@ -1235,7 +1233,9 @@ def scanner_thread(cmd, device_index):
# Start scanner process # Start scanner process
# Set OSMO_FSM_DUP_CHECK_DISABLED to prevent libosmocore # Set OSMO_FSM_DUP_CHECK_DISABLED to prevent libosmocore
# abort on duplicate FSM registration (common with apt gr-gsm) # abort on duplicate FSM registration (common with apt gr-gsm)
env = dict(os.environ, OSMO_FSM_DUP_CHECK_DISABLED='1') env = dict(os.environ,
OSMO_FSM_DUP_CHECK_DISABLED='1',
PYTHONUNBUFFERED='1')
process = subprocess.Popen( process = subprocess.Popen(
cmd, cmd,
stdout=subprocess.PIPE, stdout=subprocess.PIPE,