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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.] -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ 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. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ 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 *** -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ 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 -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 4+ messages in thread
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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