Yes you are right. From <linux/stddef.h>, #undef NULL #if defined(__cplusplus) #define NULL 0 #else #define NULL ((void *)0) #endif Thankyou, -- Kishore A K On Wed, 17 Nov 2004 22:27:34 -0700 (MST), jnf <lists@xxxxxxxxxxxxxxxxxx> wrote: > Actually the inverse is true- or at least AFAIK, I know for a fact however > NULL in C is (void *)0, and i _think_ in c++ its just 0. > > -- > > There are only two choices in life. You either conform the truth to your desire, > or you conform your desire to the truth. Which choice are you making? > On Thu, 18 Nov 2004, Kishore A K wrote: > > > Date: Thu, 18 Nov 2004 10:44:44 +0530 > > From: Kishore A K <kishoreak@xxxxxxxxx> > > To: Mandeep Sandhu <mandeep_sandhu@xxxxxxxxxxx> > > Cc: kernelnewbies <kernelnewbies@xxxxxxxxxxxx> > > Subject: Re: How is NULL pointer dereference handled inside kernel? > > > > > > NULL == 0 in all currently known architectures while coding in > > C. And I think NULL == (void *)0 if you code in C++. Infact in > > many places in the linux kernel source NULL & 0 have been used > > interchangably. > > > > -- > > Kishore A K > > > > "Dream as if you'll live forever; Live as if you'll die today." > > > > > > On Thu, 18 Nov 2004 10:27:49 +0530, Mandeep Sandhu > > <mandeep_sandhu@xxxxxxxxxxx> wrote: > > > Hi all, > > > > > > a basic question. How does the kernel handle NULL pointer > > > dereferencing inside kernel space. Supposing I initialise a pointer > > > to NULL (i.e 0), and derefernce it then why do I get an oops? > > > Is 0 not a valid address? Also I've heard that the value of NULL can > > > change from processor to processor (I think on PowerPC 0 is a valid > > > address). > > > > > > TIA, > > > -mandeep > > > > > > -- > > > Kernelnewbies: Help each other learn about the Linux kernel. > > > Archive: http://mail.nl.linux.org/kernelnewbies/ > > > FAQ: http://kernelnewbies.org/faq/ > > > > > > > > > > -- > > > > Kernelnewbies: Help each other learn about the Linux kernel. > > Archive: http://mail.nl.linux.org/kernelnewbies/ > > FAQ: http://kernelnewbies.org/faq/ > > > > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
