!4917 rapid agent close + disable ssh control master.

Merge pull request !4917 from 吴岳川/probackup

src/bin/pg_probackup/file.cpp

@@ -472,8 +472,10 @@ fio_disconnect(void)
         Assert(hdr.cop == FIO_DISCONNECTED);
         SYS_CHECK(close(fio_stdin));
         SYS_CHECK(close(fio_stdout));
+        SYS_CHECK(close(fio_stderr));
         fio_stdin = 0;
         fio_stdout = 0;
+        fio_stderr = 0;
         wait_ssh();
     }
 }
@@ -2454,7 +2456,8 @@ void fio_communicate(int in, int out)
             case FIO_DISCONNECT:
                 hdr.cop = FIO_DISCONNECTED;
                 IO_CHECK(fio_write_all(out, &hdr, sizeof(hdr)), sizeof(hdr));
-                break;
+                free(buf);
+                return;
             default:
                 Assert(false);
         }

src/bin/pg_probackup/remote.cpp

@@ -150,6 +150,9 @@ bool launch_agent(void)
     ssh_argv[ssh_argc++] = (char *)"-o";
     ssh_argv[ssh_argc++] = (char *)"Compression=no";
 
+    ssh_argv[ssh_argc++] = (char *)"-o";
+    ssh_argv[ssh_argc++] = (char *)"ControlMaster=no";
+
     ssh_argv[ssh_argc++] = (char *)"-o";
     ssh_argv[ssh_argc++] = (char *)"LogLevel=error";