Re: C programming: Segmentation fault within malloc?
Have you tried to look at the value sizeof(struct node)? It might be too big.
Otherwise, can you show us the backtrace in gdb.
On [Thu, 26 Jul 2001 03:15:46 +0300], Shaul Karl <shaulka@bezeqint.net> wrote:
> Breakpoint 2, insert_symbol (sym=0xbfffe25c) at symbols.c:197
> 197 if (!((node = (struct node *)malloc(sizeof(struct node))) &&
> (gdb) l 197
> 192
> 193 enum flag insert_symbol(struct symbol *sym)
> 194 {
> 195 struct node *node;
> 196
> 197 if (!((node = (struct node *)malloc(sizeof(struct node))) &&
> 198 (node->data = (struct symbol *)malloc(sizeof(struct
> symbol))))) {
> 199 fprintf(stderr, sym_tab_msg[MEMORY_ALLOCATION_FAILURE]);
> 200 return FALSE;
> 201 }
> (gdb) n
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x400af19e in malloc () from /lib/libc.so.6
> (gdb)
>
>
> How can it be? If malloc can not allocate memory it should return a NULL
> pointer. How can it Seg fault?
>
> [03:09:45 16]$ free
> total used free shared buffers cached
> Mem: 63584 60936 2648 31452 1344 20472
> -/+ buffers/cache: 39120 24464
> Swap: 116924 52580 64344
> [03:09:49 16]$
>
> Since all the memory is used and the machine is running for some time now,
> doesn't that precludes hardware problems?
>
> Obviously I am missing something.
>
>
> --
>
> Shaul Karl <shaulka@bezeqint.net>
>
>
>
> --
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--
Shao Zhang Tel: (02) 9209 4838
Software Engineer Fax: (02) 9209 4992
Redfern Broadband Networks (RBN) Mail: szhang@rbni.com
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