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RemoteOperations::is_port_free is updated (comment) #37

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Merged
dmitry-lipetsk merged 1 commit into from
May 26, 2026
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RemoteOperations::is_port_free is updated (comment) #37

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3 changes: 2 additions & 1 deletion src/remote_ops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -690,13 +690,14 @@ def is_port_free(self, number: int) -> bool:
assert number >= 0
assert number <= 65535 # OK?

# grep -q returns 0 if a listening socket on that port is found
port_hex = format(number, '04X')

# sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt ...
# 137: 0A01A8C0:EC08 1DA2A959:01BB 01 00000000:00000000 02:00000000 00000000 ...
C_REGEXP = r"^\s*[0-9]+:\s*[0-9a-fA-F]{8}:" + re.escape(port_hex) + r"\s+[0-9a-fA-F]{8}:[0-9a-fA-F]{4}\s+"

# grep -q returns 0 if a listening socket on that port is found

# Search /proc/net/tcp for any entry with this port
# NOTE: grep requires quote string with regular expression
# TODO: added a support for tcp/ip v6
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