[minicom-Bugs][312517] scripts never exit -- minicom hangs

[minicom-bugs at alioth.debian.org]

Bugs item #312517, was changed at 2010-05-27 20:05 by Chris Simmonds
You can respond by visiting: 
https://alioth.debian.org/tracker/?func=detail&atid=100031&aid=312517&group_id=30018

Status: Open
Priority: 3
Submitted By: Jesse Gilles (gillesj-guest)
Assigned to: Nobody (None)
Summary: scripts never exit -- minicom hangs 
Category: None
Group: None
Resolution: None


Initial Comment:
If you run a script from within minicom while attached to a serial port, the script doesn't exit when finished. Minicom hangs indefinitely, until the user hits CTRL-C. Then the script exits and control is returned to minicom as normal. Also, any output from the commands executed by the script are only printed after the user presses CTRL-C. Adding an expiclit "exit 0" command to the script makes no difference.

This seems to be a new bug in minicom 2.4 -- I had no problems running scripts with minicom 2.3.

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Comment By: Chris Simmonds (chrissimmonds-guest)
Date: 2010-05-30 09:06

Message:
<PRE>
Hmm.. the last post doesn't look pretty. Here it is again, hopefully readable this time.


The problem is in the handling of the call to poll in updown.c. The patch below fixes it.

Bye for now
Chris.

--- minicom-2.4/src/updown.c	2010-05-30 09:55:26.754320642 +0100
+++ minicom-2.4-devel/src/updown.c	2010-05-30 09:58:35.014335459 +0100
@@ -665,7 +649,11 @@
   fds[1].fd     = STDIN_FILENO; /* stdin */
   fds[1].events = POLLIN;
   script_running = 1;
-  while (script_running && poll(fds, 2, -1) > 0)
+  while (script_running && poll(fds, 2, -1) > 0) {
+    /* Bail on events other than POLLIN from pipefd.
+       Fixes bug #312517. Chris Simmonds,  chris at 2net.co.uk */
+    if ((fds[0].revents & (POLLERR | POLLHUP | POLLNVAL)))
+	break;
     for (i = 0; i < 2; i++)
       if ((fds[i].revents & POLLIN)
           && (n = read(fds[i].fd, buf, sizeof(buf)-1)) > 0) {
@@ -678,6 +666,7 @@
         timer_update();
         mc_wflush();
       }
+  }
 
   /* Collect status, and clean up. */
   m_wait(&status);
</PRE>

----------------------------------------------------------------------

Comment By: Chris Simmonds (chrissimmonds-guest)
Date: 2010-05-30 09:03

Message:
The problem is in the handling of the call to poll in updown.c. The patch below fixes it.

Bye for now
Chris.

--- minicom-2.4/src/updown.c	2010-05-30 09:55:26.754320642 +0100
+++ minicom-2.4-devel/src/updown.c	2010-05-30 09:58:35.014335459 +0100
@@ -665,7 +649,11 @@
   fds[1].fd     = STDIN_FILENO; /* stdin */
   fds[1].events = POLLIN;
   script_running = 1;
-  while (script_running && poll(fds, 2, -1) > 0)
+  while (script_running && poll(fds, 2, -1) > 0) {
+    /* Bail on events other than POLLIN from pipefd.
+       Fixes bug #312517. Chris Simmonds,  chris at 2net.co.uk */
+    if ((fds[0].revents & (POLLERR | POLLHUP | POLLNVAL)))
+	break;
     for (i = 0; i < 2; i++)
       if ((fds[i].revents & POLLIN)
           && (n = read(fds[i].fd, buf, sizeof(buf)-1)) > 0) {
@@ -678,6 +666,7 @@
         timer_update();
         mc_wflush();
       }
+  }
 
   /* Collect status, and clean up. */
   m_wait(&status);


----------------------------------------------------------------------

You can respond by visiting: 
https://alioth.debian.org/tracker/?func=detail&atid=100031&aid=312517&group_id=30018