Segfaults on pointer deletion Post: 302503086

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Top Forums Programming Segfaults on pointer deletion Post 302503086 by ctote on Wednesday 9th of March 2011 04:09:09 PM

03-09-2011

Registered User

Quote:

Originally Posted by Corona688

Is the pointer you're deleting valid? Make sure you're deleting the same pointer you started with. The wrong pointer is just as bad as a NULL pointer.
What does your destructor do? If it's deleting anything check that it's deleting what it started with too. delete doesn't care what's stored in it as long as the memory itself is valid, but the destructor might.
Are you allocating with new and deleting with delete[], or vice versa? You have to match new[n] with delete[] and new with delete.
Are you ever using arrays on the stack, or pointers to stack variables? Check you're not overrunning them.
What are you deleting when? Some heap implementations don't do thorough checking, so deleting a bad pointer long ago can cause heap errors far later.

1. Yes, it's the same pointer
2. Destructor doesn't do anything
3. Everything is allocated with 'new' and deleted with 'delete'
4. Yes, but they appear to be within bounds. I'm not sure if there's a special way to delete an object that contains arrays?
5. Not sure about this one.

Is it invalid to delete an object that contains pointers to NULL? The object I'm deleting has 3 members that are pointing to 0x0000000.

ctote

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LEARN ABOUT LINUX

deluser.conf

deluser.conf(5) 						File Formats Manual						   deluser.conf(5)

NAME

       /etc/deluser.conf - configuration file for deluser(8) and delgroup(8).

DESCRIPTION

       The file /etc/deluser.conf contains defaults for the programs deluser(8) and delgroup(8).  Each option takes the form option = value.  Dou-
       ble or single quotes are allowed around the value.  Comment lines must have a hash sign (#) at the beginning of the line.

       deluser(8) and delgroup(8) also read /etc/adduser.conf, see adduser.conf(8); settings  in  deluser.conf	may  overwrite	settings  made	in
       adduser.conf.

       The valid configuration options are:

       REMOVE_HOME
	      Removes the home directory and mail spool of the user to be removed.  Value may be 0 (don't delete) or 1 (do delete).

       REMOVE_ALL_FILES
	      Removes  all files on the system owned by the user to be removed.  If this option is activated REMOVE_HOME has no effect. Values may
	      be 0 or 1.

       BACKUP If REMOVE_HOME or REMOVE_ALL_FILES is activated all files are backuped before they are removed. The  backup  file  that  is  created
	      defaults	to username.tar(.gz|.bz2) in the directory specified by the BACKUP_TO option. The compression method is chosen to the best
	      that is available.  Values may be 0 or 1.

       BACKUP_TO
	      If BACKUP is activated, BACKUP_TO specifies the directory the backup is written to. Default is the current directory.

       NO_DEL_PATHS
	      A list of regular expressions, space separated. All files to be deleted in course of deleting home  directories  or  deleting  files
	      owned  by  the  user  to	be  deleted are checked against each of these regular expressions. If a match is detected, the file is not
	      deleted. Defaults to a list of system directories, leaving only /home.

	      In other words: By default only files below /home belonging to that specific user are going to be deleted.

       ONLY_IF_EMPTY
	      Only delete a group if there are no user who belong to this group. Defaults to 0.

       EXCLUDE_FSTYPES
	      A regular expression which describes all file systems which should be excluded when looking for files  of  a  user  to  be  deleted.
	      Defaults to "(proc|sysfs|usbfs|devpts|tmpfs)".

FILES

       /etc/deluser.conf

SEE ALSO

       deluser(8), delgroup(8), adduser.conf(5)

Debian GNU/Linux					     Version 3.112+nmu1ubuntu5						   deluser.conf(5)

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