patch 8.0.1761: job in terminal window with no output channel is killed

Problem:    Job in terminal window with no output channel is killed.
Solution:   Keep the job running when the input is a tty. (Ozaki Kiichi,
            closes #2734)

Author: brammool

src/channel.c

@@ -344,6 +344,15 @@ channel_still_useful(channel_T *channel)
 		    && has_err_msg);
 }
 
+/*
+ * Return TRUE if "channel" is closeable (i.e. all readable fds are closed).
+ */
+    static int
+channel_can_close(channel_T *channel)
+{
+    return channel->ch_to_be_closed == 0;
+}
+
 /*
  * Close a channel and free all its resources.
  */
@@ -892,7 +901,7 @@ channel_open(
     channel->ch_nb_close_cb = nb_close_cb;
     channel->ch_hostname = (char *)vim_strsave((char_u *)hostname);
     channel->ch_port = port_in;
-    channel->ch_to_be_closed |= (1 << PART_SOCK);
+    channel->ch_to_be_closed |= (1U << PART_SOCK);
 
 #ifdef FEAT_GUI
     channel_gui_register_one(channel, PART_SOCK);
@@ -988,7 +997,8 @@ ch_close_part(channel_T *channel, ch_part_T part)
 	}
 	*fd = INVALID_FD;
 
-	channel->ch_to_be_closed &= ~(1 << part);
+	/* channel is closed, may want to end the job if it was the last */
+	channel->ch_to_be_closed &= ~(1U << part);
     }
 }
 
@@ -999,6 +1009,12 @@ channel_set_pipes(channel_T *channel, sock_T in, sock_T out, sock_T err)
     {
 	ch_close_part(channel, PART_IN);
 	channel->CH_IN_FD = in;
+# if defined(UNIX)
+	/* Do not end the job when all output channels are closed, wait until
+	 * the job ended. */
+	if (isatty(in))
+	    channel->ch_to_be_closed |= (1U << PART_IN);
+# endif
     }
     if (out != INVALID_FD)
     {
@@ -1007,7 +1023,7 @@ channel_set_pipes(channel_T *channel, sock_T in, sock_T out, sock_T err)
 # endif
 	ch_close_part(channel, PART_OUT);
 	channel->CH_OUT_FD = out;
-	channel->ch_to_be_closed |= (1 << PART_OUT);
+	channel->ch_to_be_closed |= (1U << PART_OUT);
 # if defined(FEAT_GUI)
 	channel_gui_register_one(channel, PART_OUT);
 # endif
@@ -1019,7 +1035,7 @@ channel_set_pipes(channel_T *channel, sock_T in, sock_T out, sock_T err)
 # endif
 	ch_close_part(channel, PART_ERR);
 	channel->CH_ERR_FD = err;
-	channel->ch_to_be_closed |= (1 << PART_ERR);
+	channel->ch_to_be_closed |= (1U << PART_ERR);
 # if defined(FEAT_GUI)
 	channel_gui_register_one(channel, PART_ERR);
 # endif
@@ -4200,9 +4216,9 @@ channel_parse_messages(void)
     }
     while (channel != NULL)
     {
-	if (channel->ch_to_be_closed == 0)
+	if (channel_can_close(channel))
 	{
-	    channel->ch_to_be_closed = (1 << PART_COUNT);
+	    channel->ch_to_be_closed = (1U << PART_COUNT);
 	    channel_close_now(channel);
 	    /* channel may have been freed, start over */
 	    channel = first_channel;
@@ -5079,6 +5095,15 @@ job_channel_still_useful(job_T *job)
     return job->jv_channel != NULL && channel_still_useful(job->jv_channel);
 }
 
+/*
+ * Return TRUE if the channel of "job" is closeable.
+ */
+    static int
+job_channel_can_close(job_T *job)
+{
+    return job->jv_channel != NULL && channel_can_close(job->jv_channel);
+}
+
 /*
  * Return TRUE if the job should not be freed yet.  Do not free the job when
  * it has not ended yet and there is a "stoponexit" flag, an exit callback
@@ -5209,6 +5234,10 @@ job_cleanup(job_T *job)
     /* Ready to cleanup the job. */
     job->jv_status = JOB_FINISHED;
 
+    /* When only channel-in is kept open, close explicitly. */
+    if (job->jv_channel != NULL)
+	ch_close_part(job->jv_channel, PART_IN);
+
     if (job->jv_exit_cb != NULL)
     {
 	typval_T	argv[3];
@@ -5413,8 +5442,9 @@ has_pending_job(void)
     for (job = first_job; job != NULL; job = job->jv_next)
 	/* Only should check if the channel has been closed, if the channel is
 	 * open the job won't exit. */
-	if (job->jv_status == JOB_STARTED && job->jv_exit_cb != NULL
-					    && !job_channel_still_useful(job))
+	if ((job->jv_status == JOB_STARTED && !job_channel_still_useful(job))
+		    || (job->jv_status == JOB_FINISHED
+					      && job_channel_can_close(job)))
 	    return TRUE;
     return FALSE;
 }

src/os_unix.c

@@ -5638,13 +5638,14 @@ mch_job_start(char **argv, job_T *job, jobopt_T *options)
 	close(fd_err[1]);
     if (channel != NULL)
     {
-	channel_set_pipes(channel,
-		use_file_for_in || use_null_for_in
-			? INVALID_FD : fd_in[1] < 0 ? pty_master_fd : fd_in[1],
-		use_file_for_out || use_null_for_out
-		      ? INVALID_FD : fd_out[0] < 0 ? pty_master_fd : fd_out[0],
-		use_out_for_err || use_file_for_err || use_null_for_err
-		     ? INVALID_FD : fd_err[0] < 0 ? pty_master_fd : fd_err[0]);
+	int in_fd = use_file_for_in || use_null_for_in
+			? INVALID_FD : fd_in[1] < 0 ? pty_master_fd : fd_in[1];
+	int out_fd = use_file_for_out || use_null_for_out
+		      ? INVALID_FD : fd_out[0] < 0 ? pty_master_fd : fd_out[0];
+	int err_fd = use_out_for_err || use_file_for_err || use_null_for_err
+		      ? INVALID_FD : fd_err[0] < 0 ? pty_master_fd : fd_err[0];
+
+	channel_set_pipes(channel, in_fd, out_fd, err_fd);
 	channel_set_job(channel, job, options);
     }
     else

src/testdir/test_channel.vim

@@ -1848,3 +1848,14 @@ func Test_zz_ch_log()
   call assert_match("%s%s", text[2])
   call delete('Xlog')
 endfunc
+
+func Test_keep_pty_open()
+  if !has('unix')
+    return
+  endif
+
+  let job = job_start(s:python . ' -c "import time;time.sleep(0.2)"', {'out_io': 'null', 'err_io': 'null', 'pty': 1})
+  let elapsed = WaitFor({-> job_status(job) ==# 'dead'})
+  call assert_inrange(200, 1000, elapsed)
+  call job_stop(job)
+endfunc

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1761,
 /**/
     1760,
 /**/