Re: Buffer size question

[Hannes Gredler <hannes () juniper net>]

shouldn't we have upper/lower boundary checks for
such a buffer ?

i.e. minbuffer 1.5K
     maxbuffer 128K

/hannes

On Thu, Oct 14, 2004 at 02:29:14PM -0400, Ed Maste wrote:
| > I'll download one of the nightly tars and try out the 
| > environment variable idea.
| 
| Here's my simple patch to allow an environment variable
| PCAP_BUFSIZE to override the default initial buffer size.
| 
| --- pcap-bpf.c        Tue Oct  5 03:23:39 2004
| +++ pcap-bpf.c.new    Thu Oct 14 14:21:41 2004
| @@ -578,6 +578,7 @@
|       u_int v;
|       pcap_t *p;
|       struct utsname osinfo;
| +     char *cp;
|  
|  #ifdef HAVE_DAG_API
|       if (strstr(device, "dag")) {
| @@ -626,6 +627,8 @@
|        */
|       if ((ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) || v < 32768)
|               v = 32768;
| +     if ((cp = getenv("PCAP_BUFSIZE")))
| +             v = atoi(cp);
|       for ( ; v != 0; v >>= 1) {
|               /* Ignore the return value - this is because the call fails
|                * on BPF systems that don't have kernel malloc.  And if
| -
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