*/
#include <sys/types.h>
-#include <sys/ipc.h>
-#include <sys/msg.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/un.h>
+#include <time.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
+#include <stddef.h>
#include <string.h>
#include <unistd.h>
-#include <time.h>
-#include <wait.h>
+#include <linux/stddef.h>
#include "udev.h"
+#include "udev_lib.h"
+#include "udev_version.h"
#include "udevd.h"
#include "logging.h"
-static inline char *get_action(void)
-{
- char *action;
-
- action = getenv("ACTION");
- return action;
-}
-
-static inline char *get_devpath(void)
+#ifdef LOG
+unsigned char logname[LOGNAME_SIZE];
+void log_message (int level, const char *format, ...)
{
- char *devpath;
+ va_list args;
- devpath = getenv("DEVPATH");
- return devpath;
+ va_start(args, format);
+ vsyslog(level, format, args);
+ va_end(args);
}
+#endif
-static inline char *get_seqnum(void)
+static void build_hotplugmsg(struct hotplug_msg *msg, char *action,
+ char *devpath, char *subsystem, int seqnum)
{
- char *seqnum;
-
- seqnum = getenv("SEQNUM");
- return seqnum;
-}
-
-static int build_hotplugmsg(struct hotplug_msg *msg, char *action,
- char *devpath, char *subsystem, int seqnum)
-{
- msg->mtype = HOTPLUGMSGTYPE;
+ memset(msg, 0x00, sizeof(struct hotplug_msg));
+ strfieldcpy(msg->magic, UDEV_MAGIC);
msg->seqnum = seqnum;
- strncpy(msg->action, action, 8);
- strncpy(msg->devpath, devpath, 128);
- strncpy(msg->subsystem, subsystem, 16);
- return sizeof(struct hotplug_msg);
+ strfieldcpy(msg->action, action);
+ strfieldcpy(msg->devpath, devpath);
+ strfieldcpy(msg->subsystem, subsystem);
}
static int start_daemon(void)
switch (child_pid) {
case 0:
/* daemon */
- execl(DEFAULT_UDEVD_EXEC, NULL);
+ setsid();
+ chdir("/");
+ execl(UDEVD_BIN, "udevd", NULL);
dbg("exec of daemon failed");
exit(1);
case -1:
dbg("fork of helper failed");
return -1;
default:
- wait(0);
+ wait(NULL);
}
return 0;
}
+static void run_udev(const char *subsystem)
+{
+ pid_t pid;
+
+ pid = fork();
+ switch (pid) {
+ case 0:
+ /* child */
+ execl(UDEV_BIN, "udev", subsystem, NULL);
+ dbg("exec of child failed");
+ exit(1);
+ break;
+ case -1:
+ dbg("fork of child failed");
+ break;
+ default:
+ wait(NULL);
+ }
+}
int main(int argc, char* argv[])
{
- int msgid;
- key_t key;
- struct msqid_ds msg_queue;
- struct hotplug_msg message;
+ struct hotplug_msg msg;
char *action;
char *devpath;
char *subsystem;
char *seqnum;
int seq;
- int retval = -EINVAL;
- int size;
+ int retval = 1;
int loop;
struct timespec tspec;
+ int sock = -1;
+ struct sockaddr_un saddr;
+ socklen_t addrlen;
+ int started_daemon = 0;
+
+ init_logging("udevsend");
+ dbg("version %s", UDEV_VERSION);
- subsystem = argv[1];
+ subsystem = get_subsystem(argv[1]);
if (subsystem == NULL) {
dbg("no subsystem");
goto exit;
}
+ dbg("subsystem = '%s'", subsystem);
devpath = get_devpath();
if (devpath == NULL) {
dbg("no devpath");
goto exit;
}
+ dbg("DEVPATH = '%s'", devpath);
action = get_action();
if (action == NULL) {
dbg("no action");
goto exit;
}
+ dbg("ACTION = '%s'", action);
seqnum = get_seqnum();
- if (seqnum == NULL) {
- dbg("no seqnum");
- goto exit;
- }
- seq = atoi(seqnum);
-
- /* create ipc message queue or get id of our existing one */
- key = ftok(DEFAULT_UDEVD_EXEC, IPC_KEY_ID);
- size = build_hotplugmsg(&message, action, devpath, subsystem, seq);
- msgid = msgget(key, IPC_CREAT);
- if (msgid == -1) {
- dbg("error open ipc queue");
- goto exit;
+ if (seqnum == NULL)
+ seq = -1;
+ else
+ seq = atoi(seqnum);
+ dbg("SEQNUM = '%d'", seq);
+
+ sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (sock == -1) {
+ dbg("error getting socket");
+ goto fallback;
}
- /* send ipc message to the daemon */
- retval = msgsnd(msgid, &message, size, 0);
- if (retval == -1) {
- dbg("error sending ipc message");
- goto exit;
- }
+ memset(&saddr, 0x00, sizeof(struct sockaddr_un));
+ saddr.sun_family = AF_LOCAL;
+ /* use abstract namespace for socket path */
+ strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
+ addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
+
+ build_hotplugmsg(&msg, action, devpath, subsystem, seq);
- /* get state of ipc queue */
- tspec.tv_sec = 0;
- tspec.tv_nsec = 10000000; /* 10 millisec */
- loop = 20;
+ /* If we can't send, try to start daemon and resend message */
+ loop = UDEVSEND_CONNECT_RETRY;
while (loop--) {
- retval = msgctl(msgid, IPC_STAT, &msg_queue);
- if (retval == -1) {
- dbg("error getting info on ipc queue");
+ retval = sendto(sock, &msg, sizeof(struct hotplug_msg), 0,
+ (struct sockaddr *)&saddr, addrlen);
+ if (retval != -1) {
+ retval = 0;
goto exit;
}
- if (msg_queue.msg_qnum == 0)
- goto exit;
- nanosleep(&tspec, NULL);
+
+ if (errno != ECONNREFUSED) {
+ dbg("error sending message");
+ goto fallback;
+ }
+
+ if (!started_daemon) {
+ info("starting udevd daemon");
+ retval = start_daemon();
+ if (retval) {
+ info("error starting daemon");
+ goto fallback;
+ }
+ dbg("daemon started");
+ started_daemon = 1;
+ } else {
+ dbg("retry to connect %d", UDEVSEND_CONNECT_RETRY - loop);
+ tspec.tv_sec = 0;
+ tspec.tv_nsec = 100000000; /* 100 millisec */
+ nanosleep(&tspec, NULL);
+ }
}
- info("message is still in the ipc queue, starting daemon...");
- retval = start_daemon();
+fallback:
+ info("unable to connect to event daemon, try to call udev directly");
+ run_udev(subsystem);
exit:
+ if (sock != -1)
+ close(sock);
+
return retval;
}
~ianmdlvl / elogind.git / blobdiff