6 * Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com>
7 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <sys/types.h>
40 static inline char *get_action(void)
44 action = getenv("ACTION");
48 static inline char *get_devpath(void)
52 devpath = getenv("DEVPATH");
56 static inline char *get_seqnum(void)
60 seqnum = getenv("SEQNUM");
64 static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
65 char *devpath, char *subsystem, int seqnum)
67 msg->mtype = HOTPLUGMSGTYPE;
69 strncpy(msg->action, action, 8);
70 strncpy(msg->devpath, devpath, 128);
71 strncpy(msg->subsystem, subsystem, 16);
72 return sizeof(struct hotplug_msg);
75 static int start_daemon(void)
88 execl(DEFAULT_UDEVD_EXEC, NULL);
89 dbg("exec of daemon failed");
92 dbg("fork of daemon failed");
99 dbg("fork of helper failed");
108 int main(int argc, char* argv[])
112 struct msqid_ds msg_queue;
113 struct hotplug_msg message;
119 int retval = -EINVAL;
122 struct timespec tspec;
125 if (subsystem == NULL) {
130 devpath = get_devpath();
131 if (devpath == NULL) {
136 action = get_action();
137 if (action == NULL) {
142 seqnum = get_seqnum();
143 if (seqnum == NULL) {
149 /* create ipc message queue or get id of our existing one */
150 key = ftok(DEFAULT_UDEVD_EXEC, IPC_KEY_ID);
151 size = build_hotplugmsg(&message, action, devpath, subsystem, seq);
152 msgid = msgget(key, IPC_CREAT);
154 dbg("error open ipc queue");
158 /* send ipc message to the daemon */
159 retval = msgsnd(msgid, &message, size, 0);
161 dbg("error sending ipc message");
165 /* get state of ipc queue */
167 tspec.tv_nsec = 10000000; /* 10 millisec */
170 retval = msgctl(msgid, IPC_STAT, &msg_queue);
172 dbg("error getting info on ipc queue");
175 if (msg_queue.msg_qnum == 0)
177 nanosleep(&tspec, NULL);
180 info("message is still in the ipc queue, starting daemon...");
181 retval = start_daemon();