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* [Bug threads/13582] New: issues with accessing errno in non-threaded program
@ 2012-01-11 1:04 dje at google dot com
2012-01-11 9:47 ` [Bug threads/13582] " jan.kratochvil at redhat dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: dje at google dot com @ 2012-01-11 1:04 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=13582
Bug #: 13582
Summary: issues with accessing errno in non-threaded program
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: threads
AssignedTo: unassigned@sourceware.org
ReportedBy: dje@google.com
Classification: Unclassified
#include <stdio.h>
#include <errno.h>
int main() {
errno = 0;
close(3);
printf("errno = %d\n", errno);
return 0;
}
$ gdb a.out
(gdb) start
(gdb) p errno
Cannot find thread-local variables on this target
Compiling with -lpthread will make this work, but ideally it shouldn't be
necessary.
Compiling with -g3 can make this work, but it's not intuitive to the casual
user.
[and on amd64-linux gdb doesn't know __errno_location returns a 64-bit value
and tries to deference the sign-extended 32-bit result]
The error message could maybe improved (if fixing this properly is that much
harder).
[Eventually we want to remove libthread_db, but until then, perhaps gdb could
print a more helpful message if libthread_db isn't loaded?]
There has been work on this in the past, IIRC, but the issue is still present.
Filing this bug so it's not forgotten.
[I couldn't find an existing bug.]
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug threads/13582] issues with accessing errno in non-threaded program
2012-01-11 1:04 [Bug threads/13582] New: issues with accessing errno in non-threaded program dje at google dot com
@ 2012-01-11 9:47 ` jan.kratochvil at redhat dot com
2012-07-14 20:58 ` jan.kratochvil at redhat dot com
2013-01-29 22:54 ` naesten at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: jan.kratochvil at redhat dot com @ 2012-01-11 9:47 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=13582
Jan Kratochvil <jan.kratochvil at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jan.kratochvil at redhat
| |dot com
--- Comment #1 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2012-01-11 09:47:40 UTC ---
(In reply to comment #0)
> (gdb) p errno
> Cannot find thread-local variables on this target
This is work arounded in Fedora GDB the straightforward way of substituting it
by "*((int *(*) (void)) __errno_location) ()":
http://pkgs.fedoraproject.org/gitweb/?p=gdb.git;a=blob_plain;f=gdb-6.5-bz185337-resolve-tls-without-debuginfo-v2.patch;hb=master
> [and on amd64-linux gdb doesn't know __errno_location returns a 64-bit value
> and tries to deference the sign-extended 32-bit result]
This works on normal distros featuring debug info for system components.
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug threads/13582] issues with accessing errno in non-threaded program
2012-01-11 1:04 [Bug threads/13582] New: issues with accessing errno in non-threaded program dje at google dot com
2012-01-11 9:47 ` [Bug threads/13582] " jan.kratochvil at redhat dot com
@ 2012-07-14 20:58 ` jan.kratochvil at redhat dot com
2013-01-29 22:54 ` naesten at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: jan.kratochvil at redhat dot com @ 2012-07-14 20:58 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=13582
Jan Kratochvil <jan.kratochvil at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |DUPLICATE
--- Comment #2 from Jan Kratochvil <jan.kratochvil at redhat dot com> 2012-07-14 20:58:21 UTC ---
duplicate
*** This bug has been marked as a duplicate of bug 11795 ***
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^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug threads/13582] issues with accessing errno in non-threaded program
2012-01-11 1:04 [Bug threads/13582] New: issues with accessing errno in non-threaded program dje at google dot com
2012-01-11 9:47 ` [Bug threads/13582] " jan.kratochvil at redhat dot com
2012-07-14 20:58 ` jan.kratochvil at redhat dot com
@ 2013-01-29 22:54 ` naesten at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: naesten at gmail dot com @ 2013-01-29 22:54 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=13582
Samuel Bronson <naesten at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |naesten at gmail dot com
See Also| |http://bugs.debian.org/5817
| |07,
| |https://bugzilla.redhat.com
| |/show_bug.cgi?id=185337
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end of thread, other threads:[~2013-01-29 22:54 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-01-11 1:04 [Bug threads/13582] New: issues with accessing errno in non-threaded program dje at google dot com
2012-01-11 9:47 ` [Bug threads/13582] " jan.kratochvil at redhat dot com
2012-07-14 20:58 ` jan.kratochvil at redhat dot com
2013-01-29 22:54 ` naesten at gmail dot com
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