I've used code similar to yours without problems. I also compiled your
example without any problems. Works for me.
On Sun, Nov 23, 2008 at 8:57 PM, Tom H <[EMAIL PROTECTED]> wrote:
>
>
> I have the following piece of test code:
>
> int main(int argc, char *argv[])
> {
> int sock = 7; /* to simplify test case */
> struct event e0;
> struct event *e1;
>
> event_init();
>
> // works fine: ---------------
> printf("Starting test 0...\n");
> event_set(&e0, sock, EV_READ, handle_new_connection, &e0);
> event_add(&e0, NULL);
> //----------------------------
>
> // doesn't work: -------------
> printf("Starting test 1...\n");
> e1 = (struct event*) malloc(sizeof(struct event)); // <<<<<<
> if (e1==NULL)
> {
> printf("malloc failed\n");
> exit(1);
> }
>
> event_set(e1, sock, EV_READ, handle_new_connection, e1);
> event_add(e1, NULL);
> //----------------------------
>
> return 0;
> }
>
> The first test (event structure on the stack) works correctly, however the
> malloc'ed structure seems to cause problems in event_set. Output from
> valgrind:
>
> Starting test 0...
> Starting test 1...
> ==11398== Invalid write of size 4
> ==11398== at 0x402CA99: event_set (event.c:516)
> ==11398== by 0x8048668: main (test6.c:33)
> ==11398== Address 0x4172110 is 0 bytes after a block of size 72 alloc'd
> ==11398== at 0x401C405: malloc (vg_replace_malloc.c:149)
> ==11398== by 0x804862A: main (test6.c:26)
> ==11398==
> ...
>
> "0 bytes after a block of size 72 alloc'd" apparently means that something
> is accessing one byte after the allocated memory.
>
> Can anyone see what I'm doing wrong?
>
> I am running libevent-1.4.8-stable, and sizeof(struct event) is 72 (i386
> system).
>
> thanks,
>
>
> Tom
>
>
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>
>
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