root/net/unix/sysctl_net_unix.c

DEFINITIONS

1. unix_sysctl_register
2. unix_sysctl_unregister

/*
 * NET4:        Sysctl interface to net af_unix subsystem.
 *
 * Authors:     Mike Shaver.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */

#include <linux/mm.h>
#include <linux/sysctl.h>

#include <net/af_unix.h>

static ctl_table unix_table[] = {
        {
                .ctl_name       = NET_UNIX_MAX_DGRAM_QLEN,
                .procname       = "max_dgram_qlen",
                .data           = &init_net.unx.sysctl_max_dgram_qlen,
                .maxlen         = sizeof(int),
                .mode           = 0644,
                .proc_handler   = &proc_dointvec
        },
        { .ctl_name = 0 }
};

static struct ctl_path unix_path[] = {
        { .procname = "net", .ctl_name = CTL_NET, },
        { .procname = "unix", .ctl_name = NET_UNIX, },
        { },
};

int unix_sysctl_register(struct net *net)
{
        struct ctl_table *table;

        table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
        if (table == NULL)
                goto err_alloc;

        table[0].data = &net->unx.sysctl_max_dgram_qlen;
        net->unx.ctl = register_net_sysctl_table(net, unix_path, table);
        if (net->unx.ctl == NULL)
                goto err_reg;

        return 0;

err_reg:
        kfree(table);
err_alloc:
        return -ENOMEM;
}

void unix_sysctl_unregister(struct net *net)
{
        struct ctl_table *table;

        table = net->unx.ctl->ctl_table_arg;
        unregister_sysctl_table(net->unx.ctl);
        kfree(table);
}