* GDB: error detected on stdin
@ 2011-05-24 13:27 Vikash Jain
2011-05-24 14:32 ` Andreas Schwab
0 siblings, 1 reply; 5+ messages in thread
From: Vikash Jain @ 2011-05-24 13:27 UTC (permalink / raw)
To: gdb
Hi All,
I'm trying to pipe commands to gdb but I get the following messages.
Will it cause any problems? How do i resolve the same?
(gdb) Hangup detected on fd 0
error detected on stdin
Python Script
============
#!/usr/local/bin/python
import subprocess
proc=subprocess.Popen('gdb',shell=True,stdin=su
bprocess.PIPE,stdout=subprocess.PIPE,executable="/usr/local/bin/bash")
proc.stdin.write('help')
output=proc.communicate()[0]
print output
Script Log
==========
[XXX@test ~/CAT/example]$ python -u main.py
GNU gdb (GDB) 7.2.50.20110328-cvs
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i386-unknown-freebsd6.3".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
(gdb) Hangup detected on fd 0
error detected on stdin
Best Regards
Vikash Jain
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: GDB: error detected on stdin
2011-05-24 13:27 GDB: error detected on stdin Vikash Jain
@ 2011-05-24 14:32 ` Andreas Schwab
2011-05-24 19:14 ` Tom Tromey
0 siblings, 1 reply; 5+ messages in thread
From: Andreas Schwab @ 2011-05-24 14:32 UTC (permalink / raw)
To: Vikash Jain; +Cc: gdb, gdb-patches
Vikash Jain <vikashjin@gmail.com> writes:
> I'm trying to pipe commands to gdb but I get the following messages.
> Will it cause any problems? How do i resolve the same?
2011-05-24 Andreas Schwab <schwab@redhat.com>
* event-loop.c (handle_file_event): Don't handle POLLHUP as error.
--- event-loop.c.~1.49.~ 2011-03-22 11:59:52.000000000 +0100
+++ event-loop.c 2011-05-24 16:27:28.614311098 +0200
@@ -759,7 +759,6 @@ handle_file_event (event_data data)
int mask;
#ifdef HAVE_POLL
int error_mask;
- int error_mask_returned;
#endif
int event_file_desc = data.integer;
@@ -783,22 +782,19 @@ handle_file_event (event_data data)
if (use_poll)
{
#ifdef HAVE_POLL
+ /* POLLHUP means EOF, but can be combined with POLLIN to
+ signal more data to read. */
error_mask = POLLHUP | POLLERR | POLLNVAL;
- mask = (file_ptr->ready_mask & file_ptr->mask) |
- (file_ptr->ready_mask & error_mask);
- error_mask_returned = mask & error_mask;
+ mask = file_ptr->ready_mask & (file_ptr->mask | error_mask);
- if (error_mask_returned != 0)
+ if ((mask & (POLLERR | POLLNVAL)) != 0)
{
/* Work in progress. We may need to tell somebody
what kind of error we had. */
- if (error_mask_returned & POLLHUP)
- printf_unfiltered (_("Hangup detected on fd %d\n"),
- file_ptr->fd);
- if (error_mask_returned & POLLERR)
+ if (mask & POLLERR)
printf_unfiltered (_("Error detected on fd %d\n"),
file_ptr->fd);
- if (error_mask_returned & POLLNVAL)
+ if (mask & POLLNVAL)
printf_unfiltered (_("Invalid or non-`poll'able fd %d\n"),
file_ptr->fd);
file_ptr->error = 1;
Andreas.
--
Andreas Schwab, schwab@redhat.com
GPG Key fingerprint = D4E8 DBE3 3813 BB5D FA84 5EC7 45C6 250E 6F00 984E
"And now for something completely different."
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: GDB: error detected on stdin
2011-05-24 14:32 ` Andreas Schwab
@ 2011-05-24 19:14 ` Tom Tromey
2011-05-25 7:59 ` Andreas Schwab
0 siblings, 1 reply; 5+ messages in thread
From: Tom Tromey @ 2011-05-24 19:14 UTC (permalink / raw)
To: Andreas Schwab; +Cc: Vikash Jain, gdb, gdb-patches
>>>>> "Andreas" == Andreas Schwab <schwab@redhat.com> writes:
Andreas> 2011-05-24 Andreas Schwab <schwab@redhat.com>
Andreas> * event-loop.c (handle_file_event): Don't handle POLLHUP as error.
This is ok. IIRC this fixes some PR as well.
Tom
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: GDB: error detected on stdin
2011-05-24 19:14 ` Tom Tromey
@ 2011-05-25 7:59 ` Andreas Schwab
2011-05-25 8:10 ` Vikash Jain
0 siblings, 1 reply; 5+ messages in thread
From: Andreas Schwab @ 2011-05-25 7:59 UTC (permalink / raw)
To: Tom Tromey; +Cc: Vikash Jain, gdb, gdb-patches
Tom Tromey <tromey@redhat.com> writes:
>>>>>> "Andreas" == Andreas Schwab <schwab@redhat.com> writes:
>
> Andreas> 2011-05-24 Andreas Schwab <schwab@redhat.com>
> Andreas> * event-loop.c (handle_file_event): Don't handle POLLHUP as error.
>
> This is ok. IIRC this fixes some PR as well.
Yep, it's 8677.
Andreas.
--
Andreas Schwab, schwab@redhat.com
GPG Key fingerprint = D4E8 DBE3 3813 BB5D FA84 5EC7 45C6 250E 6F00 984E
"And now for something completely different."
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: GDB: error detected on stdin
2011-05-25 7:59 ` Andreas Schwab
@ 2011-05-25 8:10 ` Vikash Jain
0 siblings, 0 replies; 5+ messages in thread
From: Vikash Jain @ 2011-05-25 8:10 UTC (permalink / raw)
To: Andreas Schwab; +Cc: Tom Tromey, gdb, gdb-patches
Thanks a lot, fix worked for me.
On Wed, May 25, 2011 at 1:29 PM, Andreas Schwab <schwab@redhat.com> wrote:
> Tom Tromey <tromey@redhat.com> writes:
>
>>>>>>> "Andreas" == Andreas Schwab <schwab@redhat.com> writes:
>>
>> Andreas> 2011-05-24 Andreas Schwab <schwab@redhat.com>
>> Andreas> * event-loop.c (handle_file_event): Don't handle POLLHUP as error.
>>
>> This is ok. IIRC this fixes some PR as well.
>
> Yep, it's 8677.
>
> Andreas.
>
> --
> Andreas Schwab, schwab@redhat.com
> GPG Key fingerprint = D4E8 DBE3 3813 BB5D FA84 5EC7 45C6 250E 6F00 984E
> "And now for something completely different."
>
^ permalink raw reply [flat|nested] 5+ messages in thread
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2011-05-24 13:27 GDB: error detected on stdin Vikash Jain
2011-05-24 14:32 ` Andreas Schwab
2011-05-24 19:14 ` Tom Tromey
2011-05-25 7:59 ` Andreas Schwab
2011-05-25 8:10 ` Vikash Jain
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