diff --git a/testgres/operations/remote_ops.py b/testgres/operations/remote_ops.py
index 15d78b1..9805c9d 100644
--- a/testgres/operations/remote_ops.py
+++ b/testgres/operations/remote_ops.py
@@ -681,22 +681,31 @@ def get_process_children(self, pid):
def is_port_free(self, number: int) -> bool:
assert type(number) == int # noqa: E721
- cmd = ["nc", "-w", "5", "-z", "-v", "localhost", str(number)]
+ # grep -q returns 0 if a listening socket on that port is found
+ port_hex = format(number, '04X')
- exit_status, output, error = self.exec_command(cmd=cmd, encoding=get_default_encoding(), ignore_errors=True, verbose=True)
+ # Search /proc/net/tcp and tcp6 for any entry with this port
+ cmd = ['/bin/bash', '-lc',
+ f"grep -q ':{port_hex} ' /proc/net/tcp /proc/net/tcp6"]
- assert type(output) == str # noqa: E721
- assert type(error) == str # noqa: E721
+ exit_status, output, error = self.exec_command(
+ cmd=cmd,
+ encoding=get_default_encoding(),
+ ignore_errors=True,
+ verbose=True
+ )
+ # grep exit 0 -> port is busy
if exit_status == 0:
- return __class__._is_port_free__process_0(error)
+ return False
+ # grep exit 1 -> port is free
if exit_status == 1:
- return __class__._is_port_free__process_1(error)
-
- errMsg = "nc returns an unknown result code: {0}".format(exit_status)
+ return True
- RaiseError.CommandExecutionError(
+ # any other code is an unexpected error
+ errMsg = f"grep returned unexpected exit code: {exit_status}"
+ raise RaiseError.CommandExecutionError(
cmd=cmd,
exit_code=exit_status,
message=errMsg,
@@ -746,12 +755,7 @@ def _is_port_free__process_0(error: str) -> bool:
@staticmethod
def _is_port_free__process_1(error: str) -> bool:
assert type(error) == str # noqa: E721
- #
- # Example of error text:
- # "nc: connect to localhost (127.0.0.1) port 1024 (tcp) failed: Connection refused\n"
- #
# May be here is needed to check error message?
- #
return True
@staticmethod
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