(presumably by the glorious kernel). which you
can see dynamicly by typing top in the console.
in other words segmentation fault when free() is not a scary thing here. it is
a matter of style and the way to find own errors. or maybe reading warnings if
you compile with the flags -ansi -pedantic
On Sun, 21 Sep 2008 05:57:06 -0700 (PDT), Nash Nipples [EMAIL PROTECTED]
wrote:
thanks for making it even more clear to me.
actually what i meant was this:
void function(void){
char *p;
p = malloc(1);
}
int main(void){
while (1){
function();
/* in the end of this function
On Sunday 21 September 2008 14:57:06 Nash Nipples wrote:
can someone please explain to me what happens to the
allocated memory
called within a function assigned to its local pointer
after this function
ends
Ok - let's see if I get this right:
- the allocated memory
-
segmentation fault when free() is not a scary thing
here. it is a matter of style and the way to find own errors. or
maybe reading warnings if you compile with the flags -ansi -pedantic
I'm not sure what you are saying here, but the handling of dynamic
memory in C is something that needs to be well
On Mon, 22 Sep 2008 02:31:57 +0100, RW [EMAIL PROTECTED] wrote:
Nash Nipples [EMAIL PROTECTED] wrote:
Giorgos Keramidas wrote:
char *
function(void)
{
char buffer[100];
return buffer;
}
that is an easier approach because you get warned on passing an
On Fri, 19 Sep 2008 20:03:03 -0700 (PDT), Unga [EMAIL PROTECTED] wrote:
Hi thank you very much for your reply and the test case.
That is, in a trivial case like this, free() works well. Hopefully
free() works well in all cases too.
But my main program is 1900 lines, f1() and f2() are in a
--- On Sat, 9/20/08, Giorgos Keramidas [EMAIL PROTECTED] wrote:
From: Giorgos Keramidas [EMAIL PROTECTED]
Subject: Re: Segmentation fault when free
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED], freebsd-questions@freebsd.org
Date: Saturday, September 20, 2008, 2:23 PM
On Fri, 19 Sep 2008 20
On Sat, 20 Sep 2008 00:31:41 -0700 (PDT), Unga [EMAIL PROTECTED] wrote:
--- On Sat, 9/20/08, Giorgos Keramidas [EMAIL PROTECTED] wrote:
You are probably calling free() multiple times for the same buffer.
Try tracing the malloc and free calls, using the information from
this message:
--- On Sat, 9/20/08, Giorgos Keramidas [EMAIL PROTECTED] wrote:
1. This clearly shows my program is trying to free a
memory that has
not been allocated. How it could have happened?
Aha. This looks remarkably like an address in the runtime
stack. It
usually happens when you have a
I checked again, up to the this problematic free(),
functions return newly allocated strings properly:
char *f( )
{
char *newstr = NULL;
:
newstr = (char *) malloc(p - sp + 1);
if (newstr == NULL)
return NULL;
:
return newstr;
}
Can a yet not executed wrong free()
actually what i think someone should really tell you is that
maybe you should take a look at the free() manual which is available
here
http://www.freebsd.org/cgi/man.cgi?query=freeapropos=0sektion=0manpath=FreeBSD+7.0-RELEASEformat=html
or you can try to run `man free` in the console.
there is a
--- On Sat, 9/20/08, Giorgos Keramidas [EMAIL PROTECTED] wrote:
ktrace.out shows:
malloc_init()
0x8103400 = malloc(1024)
malloc_init()
malloc_init()
0x810b0b0 = malloc(400)
:
so many malloc
:
so many free
:
malloc/free combinations
:
free(0xbfbfc9c9)
1. This
On Sat, 20 Sep 2008 07:04:03 -0700 (PDT), Unga [EMAIL PROTECTED] wrote:
On Sat, 9/20/08, Giorgos Keramidas [EMAIL PROTECTED] wrote:
: free(0xbfbfc9c9)
1. This clearly shows my program is trying to free a memory that
has not been allocated. How it could have happened?
Aha. This looks
On Saturday 20 September 2008 13:46:23 Nash Nipples wrote:
can someone please explain to me what happens to the allocated memory
called within a function assigned to its local pointer after this function
ends
Ok - let's see if I get this right:
- the allocated memory
- called within a
Hi all
I'm running FreeBSD 7 on i386. I have a C program compiled with gcc 4.2.1
20070719.
Logically my program is:
char *a;
char *b;
char *c;
while (cond)
{
a = f1(); /* malloc() and send a string */
b = f2(); /* malloc() and send a string */
c = (char *) malloc(strlen(a) + strlen(b) +
--- On Fri, 9/19/08, Unga [EMAIL PROTECTED] wrote:
From: Unga [EMAIL PROTECTED]
Subject: Segmentation fault when free
To: freebsd-questions@freebsd.org
Date: Friday, September 19, 2008, 9:17 AM
Hi all
I'm running FreeBSD 7 on i386. I have a C program
compiled with gcc 4.2.1 20070719
--- On Sat, 9/20/08, Nash Nipples [EMAIL PROTECTED] wrote:
From: Nash Nipples [EMAIL PROTECTED]
Subject: Re: Segmentation fault when free
To: freebsd-questions@freebsd.org
Date: Saturday, September 20, 2008, 4:14 AM
--- On Fri, 9/19/08, Unga [EMAIL PROTECTED] wrote:
From: Unga [EMAIL
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