Re: No buffer space available??

From: Dan Kegel (
Date: Mon Feb 05 2001 - 14:03:26 EST

Mathieu Dube wrote:
> when accept return -1 perror gives me "No buffer space available"
> What do you think that means??

Better ask a real net guru :-)
Or look at the sources.

in /usr/src/linux/net/ipv4/af_inet.c

int inet_create() {
    sk = sk_alloc(PF_INET, GFP_KERNEL, 1);
    if (sk == NULL)
        goto do_oom;
        return -ENOBUFS;

in /usr/src/linux/net/core/sock.c

 * All socket objects are allocated here. This is for future
 * usage.
struct sock *sk_alloc(int family, int priority, int zero_it)
    struct sock *sk = kmem_cache_alloc(sk_cachep, priority);
    if(sk) {
        if (zero_it)
            memset(sk, 0, sizeof(struct sock));
        sk->family = family;
    return sk;

void __init sk_init(void)
    sk_cachep = kmem_cache_create("sock", sizeof(struct sock), 0,
                      SLAB_HWCACHE_ALIGN, 0, 0);

Poking around a little in mm/slab.c, I see that the name passed to
kmem_cache_create is used in generating the /proc/slabinfo report, so
  cat /proc/slabinfo | grep sock
shows you some info. On my system, it prints two numbers, from
        len += sprintf(buf+len, "%-17s %6lu %6lu\n", cachep->c_name, active_objs, num_objs);
which tells you how many sockets are allocated. Dunno how useful that is.

Like I said, you'll have to ask a real guru :-)

- Dan
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