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872344c410
As Chris Friesen <chris_friesen@sympatico.ca> suggested, here we switch
the unix domains socket path to abstract namespace and get rid of the
socket file in the filesystem.
Hey, this was new to me today. So here a few words:
Linux supports a abstract namespace for sockets. We don't need a
physical file on the filesystem but only a unique string magically
starting with the '\0' character.
strace with real file:
connect(3, {sa_family=AF_UNIX, path="/udev/.udevd.sock"}, 110)
strace with abstract namespace:
connect(3, {sa_family=AF_UNIX, path=@udevd}, 110)
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
/*
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* udevd.h
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*
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* Userspace devfs
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*
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* Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "list.h"
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#define UDEV_MAGIC "udevd_" UDEV_VERSION
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#define EVENT_TIMEOUT_SEC 5
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#define UDEVSEND_CONNECT_RETRY 20 /* x 100 millisec */
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#define UDEVD_SOCK_PATH "udevd"
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struct hotplug_msg {
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char magic[20];
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struct list_head list;
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pid_t pid;
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int seqnum;
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time_t queue_time;
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char action[8];
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char devpath[128];
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char subsystem[16];
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};
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