Added Channel.signal function for sending signals to an open channel.

* Added CI tests for sending signals to channel.
* Resolves #221 (#227)

Author: pkittenis

ci/integration_tests/test_channel.py

@@ -2,6 +2,7 @@
 import socket
 from subprocess import check_output
 from unittest import skipUnless
+from signal import Signals
 
 
 from ssh2.session import Session
@@ -214,3 +215,16 @@ def test_execute_with_session_compression(self):
         size, data = chan.read()
         lines = [line.decode('utf-8') for line in data.splitlines()]
         self.assertTrue(lines, [self.resp])
+
+    def test_channel_signal(self):
+        self.assertEqual(self._auth(), 0)
+        my_sig = Signals.SIGTERM
+        chan = self.session.open_session()
+        chan.execute('sleep 10 && exit 2')
+        self.assertTrue(chan.signal(my_sig.name[3:]) == 0)
+        chan.send_eof()
+        chan.wait_eof()
+        chan.close()
+        chan.wait_closed()
+        exit_code = chan.get_exit_status()
+        self.assertNotEqual(exit_code, 2)

ssh2/c_ssh2.pxd

@@ -337,6 +337,7 @@ cdef extern from "libssh2.h" nogil:
     int libssh2_channel_close(LIBSSH2_CHANNEL *channel)
     int libssh2_channel_wait_closed(LIBSSH2_CHANNEL *channel)
     int libssh2_channel_free(LIBSSH2_CHANNEL *channel)
+    int libssh2_channel_signal_ex(LIBSSH2_CHANNEL *channel, const char *signame, size_t signame_len)
 
     # libssh2_scp_recv is DEPRECATED, do not use!
     LIBSSH2_CHANNEL *libssh2_scp_recv(LIBSSH2_SESSION *session,