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Fix for the ``gdb -k /nonexistent /dev/mem'' core dump.

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Submitted by:	gj@freebsd.org (Gary Jennejohn)
This commit is contained in:
Joerg Wunsch 1995-04-19 22:59:33 +00:00
parent 954f5fffa2
commit e6073fb7f6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=7942
1 changed files with 12 additions and 2 deletions
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14
gnu/usr.bin/gdb/gdb/kcorelow.c
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@ -17,7 +17,7 @@ You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: kcorelow.c,v 1.2 1994/05/18 12:42:15 pk Exp $ $Id: kcorelow.c,v 1.1 1994/12/30 23:32:56 jkh Exp $
*/ */
#include "defs.h" #include "defs.h"
@ -170,8 +170,18 @@ kcore_open (filename, from_tty)
old_chain = make_cleanup (free, filename); old_chain = make_cleanup (free, filename);
/*
* gdb doesn't really do anything if the exec-file couldn't
* be opened (in that case exec_bfd is NULL). Usually that's
* no big deal, but kvm_open needs the exec-file's name,
* which results in dereferencing a NULL pointer, a real NO-NO !
* So, check here if the open of the exec-file succeeded.
*/
if (exec_bfd == NULL) /* the open failed */
error ("kgdb could not open the exec-file, please check the name you used !");
core_kd = kvm_open (exec_bfd->filename, filename, NULL, core_kd = kvm_open (exec_bfd->filename, filename, NULL,
write_files? O_RDWR: O_RDONLY, 0); write_files? O_RDWR: O_RDONLY, "kgdb: ");
if (core_kd < 0) if (core_kd < 0)
perror_with_name (filename); perror_with_name (filename);