struct hotplug_msg *loop_msg;
struct sysinfo info;
- /* sort message by sequence number into list. events
- * will tend to come in order, so scan the list backwards
- */
- list_for_each_entry_reverse(loop_msg, &msg_list, list)
+ if (msg->seqnum == 0) {
+ dbg("no SEQNUM, move straight to the exec queue");
+ list_add(&msg->list, &exec_list);
+ run_exec_q = 1;
+ return;
+ }
+
+ /* sort message by sequence number into list */
+ list_for_each_entry_reverse(loop_msg, &msg_list, list) {
if (loop_msg->seqnum < msg->seqnum)
break;
+ if (loop_msg->seqnum == msg->seqnum) {
+ dbg("ignoring duplicate message seq %llu", msg->seqnum);
+ return;
+ }
+ }
+
/* store timestamp of queuing */
sysinfo(&info);
msg->queue_time = info.uptime;
/* run msg queue manager */
run_msg_q = 1;
- return ;
+ return;
}
/* forks event and removes event from run queue when finished */
}
}
-/* receive the msg, do some basic sanity checks, and queue it */
-static void handle_udevsend_msg(int sock)
+/* receive the udevsend message and do some sanity checks */
+static struct hotplug_msg *get_udevsend_msg(void)
{
static struct udevsend_msg usend_msg;
struct hotplug_msg *msg;
smsg.msg_control = cred_msg;
smsg.msg_controllen = sizeof(cred_msg);
- size = recvmsg(sock, &smsg, 0);
+ size = recvmsg(udevsendsock, &smsg, 0);
if (size < 0) {
if (errno != EINTR)
- dbg("unable to receive message");
- return;
+ dbg("unable to receive udevsend message");
+ return NULL;
}
cmsg = CMSG_FIRSTHDR(&smsg);
cred = (struct ucred *) CMSG_DATA(cmsg);
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
dbg("no sender credentials received, message ignored");
- goto exit;
+ return NULL;
}
if (cred->uid != 0) {
dbg("sender uid=%i, message ignored", cred->uid);
- goto exit;
+ return NULL;
}
if (strncmp(usend_msg.magic, UDEV_MAGIC, sizeof(UDEV_MAGIC)) != 0 ) {
dbg("message magic '%s' doesn't match, ignore it", usend_msg.magic);
- goto exit;
+ return NULL;
}
envbuf_size = size - offsetof(struct udevsend_msg, envbuf);
dbg("envbuf_size=%i", envbuf_size);
msg = malloc(sizeof(struct hotplug_msg) + envbuf_size);
+ if (msg == NULL)
+ return NULL;
+
memset(msg, 0x00, sizeof(struct hotplug_msg) + envbuf_size);
/* copy environment buffer and reconstruct envp */
msg->envp[i++] = "UDEVD_EVENT=1";
msg->envp[i] = NULL;
- /* if no seqnum is given, we move straight to exec queue */
- if (msg->seqnum == 0) {
- list_add(&msg->list, &exec_list);
- run_exec_q = 1;
- } else {
- msg_queue_insert(msg);
- }
-
-exit:
- return;
+ return msg;
}
static void asmlinkage sig_handler(int signum)
static void user_sighandler(void)
{
int sig;
+
while(1) {
int rc = read(pipefds[0], &sig, sizeof(sig));
if (rc < 0)
}
}
-int main(int argc, char *argv[], char *envp[])
+static int init_udevsend_socket(void)
{
- struct sysinfo info;
- int maxsockplus;
struct sockaddr_un saddr;
socklen_t addrlen;
- int retval, fd;
const int feature_on = 1;
+ int retval;
+
+ memset(&saddr, 0x00, sizeof(saddr));
+ 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;
+
+ udevsendsock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (udevsendsock == -1) {
+ dbg("error getting socket, %s", strerror(errno));
+ return -1;
+ }
+
+ /* the bind takes care of ensuring only one copy running */
+ retval = bind(udevsendsock, (struct sockaddr *) &saddr, addrlen);
+ if (retval < 0) {
+ dbg("bind failed, %s", strerror(errno));
+ close(udevsendsock);
+ return -1;
+ }
+
+ /* enable receiving of the sender credentials */
+ setsockopt(udevsendsock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
+
+ return 0;
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+ struct sysinfo info;
+ int maxsockplus;
+ int retval;
+ int fd;
struct sigaction act;
fd_set readfds;
+ const char *udevd_expected_seqnum;
logging_init("udevd");
dbg("version %s", UDEV_VERSION);
goto exit;
}
+ /* daemonize on request */
+ if (argc == 2 && strcmp(argv[1], "-d") == 0) {
+ pid_t pid;
+
+ pid = fork();
+ switch (pid) {
+ case 0:
+ dbg("damonized fork running");
+ break;
+ case -1:
+ dbg("fork of daemon failed");
+ goto exit;
+ default:
+ logging_close();
+ exit(0);
+ }
+ }
+
/* make sure we don't lock any path */
chdir("/");
umask(umask(077) | 022);
/* Set fds to dev/null */
fd = open( "/dev/null", O_RDWR );
- if ( fd < 0 ) {
+ if (fd >= 0) {
+ dup2(fd, 0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ if (fd > 2)
+ close(fd);
+ } else
dbg("error opening /dev/null %s", strerror(errno));
- goto exit;
- }
- dup2(fd, 0);
- dup2(fd, 1);
- dup2(fd, 2);
- if (fd > 2)
- close(fd);
/* become session leader */
setsid();
goto exit;
}
retval = fcntl(pipefds[0], F_SETFD, FD_CLOEXEC);
- if (retval < 0) {
+ if (retval < 0)
dbg("error fcntl on read pipe: %s", strerror(errno));
- goto exit;
- }
retval = fcntl(pipefds[1], F_SETFL, O_NONBLOCK);
if (retval < 0) {
goto exit;
}
retval = fcntl(pipefds[1], F_SETFD, FD_CLOEXEC);
- if (retval < 0) {
+ if (retval < 0)
dbg("error fcntl on write pipe: %s", strerror(errno));
- goto exit;
- }
/* set signal handlers */
act.sa_handler = (void (*) (int))sig_handler;
sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
- memset(&saddr, 0x00, sizeof(saddr));
- 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;
+ if (init_udevsend_socket() < 0) {
+ if (errno == EADDRINUSE)
+ dbg("another udevd running, exit");
+ else
+ dbg("error initialising udevsend socket: %s", strerror(errno));
- udevsendsock = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (udevsendsock == -1) {
- dbg("error getting socket, exit");
goto exit;
}
- /* the bind takes care of ensuring only one copy running */
- retval = bind(udevsendsock, (struct sockaddr *) &saddr, addrlen);
- if (retval < 0) {
- dbg("bind failed, exit");
- close(udevsendsock);
- goto exit;
- }
-
- /* enable receiving of the sender credentials */
- setsockopt(udevsendsock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
-
/* possible override of udev binary, used for testing */
udev_bin = getenv("UDEV_BIN");
if (udev_bin != NULL)
else
udev_bin = UDEV_BIN;
- /* handle special startup timeout*/
+ /* possible set of expected_seqnum number */
+ udevd_expected_seqnum = getenv("UDEVD_EXPECTED_SEQNUM");
+ if (udevd_expected_seqnum != NULL) {
+ expected_seqnum = strtoull(udevd_expected_seqnum, NULL, 10);
+ dbg("initialize expected_seqnum to %llu", expected_seqnum);
+ }
+
+ /* get current time to provide shorter startup timeout */
sysinfo(&info);
startup_time = info.uptime;
FD_SET(pipefds[0], &readfds);
maxsockplus = udevsendsock+1;
while (1) {
+ struct hotplug_msg *msg;
+
fd_set workreadfds = readfds;
retval = select(maxsockplus, &workreadfds, NULL, NULL, NULL);
continue;
}
- if (FD_ISSET(udevsendsock, &workreadfds))
- handle_udevsend_msg(udevsendsock);
+ if (FD_ISSET(udevsendsock, &workreadfds)) {
+ msg = get_udevsend_msg();
+ if (msg)
+ msg_queue_insert(msg);
+ }
if (FD_ISSET(pipefds[0], &workreadfds))
user_sighandler();
~ianmdlvl / elogind.git / blobdiff