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 memset(msg, 0x00, sizeof(msg));
68 msg->mtype = HOTPLUGMSGTYPE;
70 strncpy(msg->action, action, 8);
71 strncpy(msg->devpath, devpath, 128);
72 strncpy(msg->subsystem, subsystem, 16);
73 return sizeof(struct hotplug_msg);
76 static int start_daemon(void)
91 execl(UDEVD_EXEC, "udevd", NULL);
92 dbg("exec of daemon failed");
95 dbg("fork of daemon failed");
102 dbg("fork of helper failed");
111 int main(int argc, char* argv[])
115 struct msqid_ds msg_queue;
116 struct hotplug_msg message;
122 int retval = -EINVAL;
125 struct timespec tspec;
128 if (subsystem == NULL) {
133 devpath = get_devpath();
134 if (devpath == NULL) {
139 action = get_action();
140 if (action == NULL) {
145 seqnum = get_seqnum();
146 if (seqnum == NULL) {
152 /* create ipc message queue or get id of our existing one */
153 key = ftok(UDEVD_EXEC, IPC_KEY_ID);
154 size = build_hotplugmsg(&message, action, devpath, subsystem, seq);
155 msgid = msgget(key, IPC_CREAT);
157 dbg("error open ipc queue");
161 /* send ipc message to the daemon */
162 retval = msgsnd(msgid, &message, size, 0);
164 dbg("error sending ipc message");
168 /* get state of ipc queue */
170 tspec.tv_nsec = 10000000; /* 10 millisec */
173 retval = msgctl(msgid, IPC_STAT, &msg_queue);
175 dbg("error getting info on ipc queue");
178 if (msg_queue.msg_qnum == 0)
180 nanosleep(&tspec, NULL);
183 info("message is still in the ipc queue, starting daemon...");
184 retval = start_daemon();