#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <wait.h>
#include "udev.h"
#include "udevd.h"
free(pmsg);
}
+static int start_daemon(void)
+{
+ pid_t pid;
+ pid_t child_pid;
+
+ pid = fork();
+ switch (pid) {
+ case 0:
+ /* helper child */
+ child_pid = fork();
+ switch (child_pid) {
+ case 0:
+ /* daemon */
+ execl(DEFAULT_UDEVD_EXEC, NULL);
+ dbg("exec of daemon failed");
+ exit(1);
+ case -1:
+ dbg("fork of daemon failed");
+ return -1;
+ default:
+ exit(0);
+ }
+ break;
+ case -1:
+ dbg("fork of helper failed");
+ return -1;
+ default:
+ wait(0);
+ }
+ return 0;
+}
+
+
int main(int argc, char* argv[])
{
int msgid;
int seq;
int retval = -EINVAL;
int size;
+ int loop;
+ struct timespec tspec;
subsystem = argv[1];
if (subsystem == NULL) {
dbg("no seqnum");
goto exit;
}
-
seq = atoi(seqnum);
- key = ftok(DEFAULT_EXEC_PROGRAM, IPC_KEY_ID);
+
+ /* create ipc message queue or get id of our existing one */
+ key = ftok(DEFAULT_UDEVD_EXEC, IPC_KEY_ID);
size = build_hotplugmsg( (struct hotplug_msg**) &pmsg, action, devpath, subsystem, seq);
msgid = msgget(key, IPC_CREAT);
- if (msgid == -1)
- {
- dbg("open ipc queue error");
+ if (msgid == -1) {
+ dbg("error open ipc queue");
goto exit;
}
- /* get state of queue */
- retval = msgctl(msgid, IPC_STAT, &msg_queue);
+ /* send ipc message to the daemon */
+ retval = msgsnd(msgid, pmsg, size, 0);
+ free_hotplugmsg( (struct hotplug_msg*) pmsg);
if (retval == -1) {
- dbg("error getting info on ipc queue");
+ dbg("error sending ipc message");
goto exit;
}
- if (msg_queue.msg_qnum > 0)
- dbg("%li messages already in the ipc queue", msg_queue.msg_qnum);
- retval = msgsnd(msgid, pmsg, size, 0);
- free_hotplugmsg( (struct hotplug_msg*) pmsg);
- if (retval == -1)
- {
- dbg("send ipc message error");
- goto exit;
+ /* get state of ipc queue */
+ tspec.tv_sec = 0;
+ tspec.tv_nsec = 10000000; /* 10 millisec */
+ loop = 20;
+ while (loop--) {
+ retval = msgctl(msgid, IPC_STAT, &msg_queue);
+ if (retval == -1) {
+ dbg("error getting info on ipc queue");
+ goto exit;
+ }
+ if (msg_queue.msg_qnum == 0)
+ goto exit;
+ nanosleep(&tspec, NULL);
}
- return 0;
-exit:
- if (retval > 0)
- retval = 0;
+ info("message is still in the ipc queue, starting daemon...");
+ retval = start_daemon();
+exit:
return retval;
}