#include <dirent.h>
#include <fcntl.h>
#include <syslog.h>
+#include <time.h>
#include <sys/select.h>
#include <sys/wait.h>
-#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
-#include <sys/sysinfo.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include "udevd.h"
#include "logging.h"
-/* global variables*/
struct udev_rules rules;
static int udevd_sock;
static int uevent_netlink_sock;
static int signal_pipe[2] = {-1, -1};
static volatile int sigchilds_waiting;
-static volatile int run_msg_q;
static volatile int udev_exit;
static volatile int reload_config;
-static int init_phase = 1;
static int run_exec_q;
static int stop_exec_q;
-static int event_timeout;
static int max_childs;
static int max_childs_running;
-static unsigned long long expected_seqnum;
static char udev_log[32];
-static LIST_HEAD(msg_list);
static LIST_HEAD(exec_list);
static LIST_HEAD(running_list);
}
#endif
-static void msg_dump_queue(void)
-{
-#ifdef DEBUG
- struct uevent_msg *msg;
-
- list_for_each_entry(msg, &msg_list, node)
- dbg("sequence %llu in queue", msg->seqnum);
-#endif
-}
-
-static void msg_queue_delete(struct uevent_msg *msg)
-{
- list_del(&msg->node);
- free(msg);
-}
-
-/* orders the message in the queue by sequence number */
-static void msg_queue_insert(struct uevent_msg *msg)
-{
- struct uevent_msg *loop_msg;
- struct sysinfo info;
-
- if (msg->seqnum == 0) {
- dbg("no SEQNUM, move straight to the exec queue");
- list_add_tail(&msg->node, &exec_list);
- run_exec_q = 1;
- return;
- }
-
- /* store timestamp of queuing */
- sysinfo(&info);
- msg->queue_time = info.uptime;
-
- /* with the first event we provide a phase of shorter timeout */
- if (init_phase) {
- static long init_time;
-
- if (init_time == 0)
- init_time = info.uptime;
- if (info.uptime - init_time >= UDEVD_INIT_TIME)
- init_phase = 0;
- }
-
- /* sort message by sequence number into list */
- list_for_each_entry_reverse(loop_msg, &msg_list, node) {
- if (loop_msg->seqnum < msg->seqnum)
- break;
-
- if (loop_msg->seqnum == msg->seqnum) {
- dbg("ignoring duplicate message seq %llu", msg->seqnum);
- free(msg);
- return;
- }
- }
- list_add(&msg->node, &loop_msg->node);
- info("seq %llu queued, '%s' '%s'", msg->seqnum, msg->action, msg->devpath);
-
- /* run msg queue manager */
- run_msg_q = 1;
-
- return;
-}
-
static void asmlinkage udev_event_sig_handler(int signum)
{
if (signum == SIGALRM)
if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
pass_env_to_socket(&name_loop->name[strlen("socket:")], msg->devpath, msg->action);
else
- run_program(name_loop->name, udev.subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO));
+ if (run_program(name_loop->name, udev.subsystem, NULL, 0, NULL,
+ (udev_log_priority >= LOG_INFO)))
+ retval = -1;
}
}
udev_cleanup_device(&udev);
- return 0;
+ return retval;
+}
+
+enum event_state {
+ EVENT_QUEUED,
+ EVENT_FINISHED,
+ EVENT_FAILED,
+};
+
+static void export_event_state(struct uevent_msg *msg, enum event_state state)
+{
+ char filename[PATH_SIZE];
+ char filename_failed[PATH_SIZE];
+ char target[PATH_SIZE];
+ size_t start, end, i;
+ struct uevent_msg *loop_msg;
+
+ /* add location of queue files */
+ strlcpy(filename, udev_root, sizeof(filename));
+ strlcat(filename, "/", sizeof(filename));
+ start = strlcat(filename, EVENT_QUEUE_DIR, sizeof(filename));
+ end = strlcat(filename, msg->devpath, sizeof(filename));
+ if (end > sizeof(filename))
+ end = sizeof(filename);
+
+ /* replace '/' to transform path into a filename */
+ for (i = start+1; i < end; i++)
+ if (filename[i] == '/')
+ filename[i] = PATH_TO_NAME_CHAR;
+
+ /* add location of failed files */
+ strlcpy(filename_failed, udev_root, sizeof(filename_failed));
+ strlcat(filename_failed, "/", sizeof(filename_failed));
+ start = strlcat(filename_failed, EVENT_FAILED_DIR, sizeof(filename_failed));
+ end = strlcat(filename_failed, msg->devpath, sizeof(filename_failed));
+ if (end > sizeof(filename_failed))
+ end = sizeof(filename_failed);
+
+ /* replace '/' to transform path into a filename */
+ for (i = start+1; i < end; i++)
+ if (filename_failed[i] == '/')
+ filename_failed[i] = PATH_TO_NAME_CHAR;
+
+ switch (state) {
+ case EVENT_QUEUED:
+ unlink(filename_failed);
+ delete_path(filename_failed);
+
+ strlcpy(target, sysfs_path, sizeof(target));
+ strlcat(target, msg->devpath, sizeof(target));
+ create_path(filename);
+ symlink(target, filename);
+ return;
+ case EVENT_FINISHED:
+ case EVENT_FAILED:
+ unlink(filename_failed);
+ delete_path(filename_failed);
+
+ /* don't remove, if events for the same path are still pending */
+ list_for_each_entry(loop_msg, &running_list, node)
+ if (loop_msg->devpath && strcmp(loop_msg->devpath, msg->devpath) == 0)
+ return;
+
+ /* move failed events to the failed directory */
+ if (state == EVENT_FAILED) {
+ create_path(filename_failed);
+ rename(filename, filename_failed);
+ } else {
+ unlink(filename);
+ }
+
+ /* clean up the queue directory */
+ delete_path(filename);
+
+ return;
+ }
+}
+
+static void msg_queue_delete(struct uevent_msg *msg)
+{
+ list_del(&msg->node);
+
+ /* mark as failed, if add event returns non-zero */
+ if (msg->exitstatus && strcmp(msg->action, "add") == 0)
+ export_event_state(msg, EVENT_FAILED);
+ else
+ export_event_state(msg, EVENT_FINISHED);
+
+ free(msg);
}
-/* runs event and removes event from run queue when finished */
static void udev_event_run(struct uevent_msg *msg)
{
pid_t pid;
- struct sysinfo info;
+ int retval;
pid = fork();
switch (pid) {
case 0:
/* child */
- if (uevent_netlink_sock > 0)
- close(uevent_netlink_sock);
+ close(uevent_netlink_sock);
+ close(udevd_sock);
if (inotify_fd > 0)
close(inotify_fd);
- close(udevd_sock);
close(signal_pipe[READ_END]);
close(signal_pipe[WRITE_END]);
logging_close();
logging_init("udevd-event");
setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
- udev_event_process(msg);
+ retval = udev_event_process(msg);
info("seq %llu finished", msg->seqnum);
logging_close();
+ if (retval)
+ exit(1);
exit(0);
case -1:
- err("fork of child failed");
+ err("fork of child failed: %s", strerror(errno));
msg_queue_delete(msg);
break;
default:
/* get SIGCHLD in main loop */
- sysinfo(&info);
info("seq %llu forked, pid [%d], '%s' '%s', %ld seconds old",
- msg->seqnum, pid, msg->action, msg->subsystem, info.uptime - msg->queue_time);
+ msg->seqnum, pid, msg->action, msg->subsystem, time(NULL) - msg->queue_time);
msg->pid = pid;
}
}
+static void msg_queue_insert(struct uevent_msg *msg)
+{
+ msg->queue_time = time(NULL);
+
+ export_event_state(msg, EVENT_QUEUED);
+
+ /* run all events with a timeout set immediately */
+ if (msg->timeout != 0) {
+ list_add_tail(&msg->node, &running_list);
+ udev_event_run(msg);
+ return;
+ }
+
+ list_add_tail(&msg->node, &exec_list);
+ run_exec_q = 1;
+}
+
+/* runs event and removes event from run queue when finished */
static int running_processes(void)
{
int f;
struct uevent_msg *loop_msg;
int childs_count = 0;
- if (msg->devpath == NULL)
- return 0;
-
- /* skip any events with a timeout set */
- if (msg->timeout != 0)
- return 0;
-
list_for_each_entry(loop_msg, &running_list, node) {
if (limit && childs_count++ > limit) {
dbg("%llu, maximum number (%i) of child reached", msg->seqnum, childs_count);
return 1;
}
- if (loop_msg->devpath == NULL)
- continue;
/* return running parent/child device event */
if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
}
/* exec queue management routine executes the events and serializes events in the same sequence */
-static void exec_queue_manager(void)
+static void msg_queue_manager(void)
{
struct uevent_msg *loop_msg;
struct uevent_msg *tmp_msg;
running = running_processes_in_session(sid, max_childs_running+10);
dbg("at least %d processes running in session", running);
if (running >= max_childs_running) {
- dbg("delay seq %llu, cause too many processes already running",
- loop_msg->seqnum);
+ dbg("delay seq %llu, too many processes already running", loop_msg->seqnum);
return;
}
}
- if (running_with_devpath(loop_msg, max_childs) == 0) {
- /* move event to run list */
- list_move_tail(&loop_msg->node, &running_list);
- udev_event_run(loop_msg);
- running++;
- dbg("moved seq %llu to running list", loop_msg->seqnum);
- } else
+ /* don't run two processes for the same devpath and wait for the parent*/
+ if (running_with_devpath(loop_msg, max_childs)) {
dbg("delay seq %llu (%s)", loop_msg->seqnum, loop_msg->devpath);
- }
-}
-
-static void msg_move_exec(struct uevent_msg *msg)
-{
- list_move_tail(&msg->node, &exec_list);
- run_exec_q = 1;
- expected_seqnum = msg->seqnum+1;
- dbg("moved seq %llu to exec, next expected is %llu",
- msg->seqnum, expected_seqnum);
-}
-
-/* msg queue management routine handles the timeouts and dispatches the events */
-static void msg_queue_manager(void)
-{
- struct uevent_msg *loop_msg;
- struct uevent_msg *tmp_msg;
- struct sysinfo info;
- long msg_age = 0;
- int timeout = event_timeout;
-
- dbg("msg queue manager, next expected is %llu", expected_seqnum);
-recheck:
- sysinfo(&info);
- list_for_each_entry_safe(loop_msg, tmp_msg, &msg_list, node) {
- /* move event with expected sequence to the exec list */
- if (loop_msg->seqnum == expected_seqnum) {
- msg_move_exec(loop_msg);
continue;
}
- /* limit timeout during initialization phase */
- if (init_phase) {
- if (timeout > UDEVD_INIT_EVENT_TIMEOUT)
- timeout = UDEVD_INIT_EVENT_TIMEOUT;
- dbg("initialization phase, timeout %i seconds", timeout);
- }
-
- /* move event with expired timeout to the exec list */
- msg_age = info.uptime - loop_msg->queue_time;
- dbg("seq %llu is %li seconds old", loop_msg->seqnum, msg_age);
- if (msg_age >= timeout) {
- msg_move_exec(loop_msg);
- goto recheck;
- } else
- break;
- }
-
- msg_dump_queue();
-
- /* set timeout for remaining queued events */
- if (!list_empty(&msg_list)) {
- struct itimerval itv = {{0, 0}, {timeout - msg_age, 0}};
- info("next event expires in %li seconds", timeout - msg_age);
- setitimer(ITIMER_REAL, &itv, NULL);
+ /* move event to run list */
+ list_move_tail(&loop_msg->node, &running_list);
+ udev_event_run(loop_msg);
+ running++;
+ dbg("moved seq %llu to running list", loop_msg->seqnum);
}
}
msg->envp[i++] = "UDEVD_EVENT=1";
msg->envp[i] = NULL;
+ if (!msg->devpath) {
+ info("DEVPATH missing, ignore message");
+ free(msg);
+ return NULL;
+ }
+
return msg;
}
size = recvmsg(udevd_sock, &smsg, 0);
if (size < 0) {
if (errno != EINTR)
- err("unable to receive udevd message");
+ err("unable to receive udevd message: %s", strerror(errno));
return NULL;
}
cmsg = CMSG_FIRSTHDR(&smsg);
case UDEVD_START_EXEC_QUEUE:
info("udevd message (START_EXEC_QUEUE) received");
stop_exec_q = 0;
- exec_queue_manager();
+ msg_queue_manager();
break;
case UDEVD_SET_LOG_LEVEL:
intval = (int *) usend_msg.envbuf;
size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
if (size < 0) {
if (errno != EINTR)
- err("unable to receive udevd message");
+ err("unable to receive udevd message: %s", strerror(errno));
return NULL;
}
case SIGTERM:
udev_exit = 1;
break;
- case SIGALRM:
- /* set flag, then write to pipe if needed */
- run_msg_q = 1;
- break;
case SIGCHLD:
/* set flag, then write to pipe if needed */
sigchilds_waiting = 1;
write(signal_pipe[WRITE_END], "", 1);
}
-static void udev_done(int pid)
+static void udev_done(int pid, int exitstatus)
{
/* find msg associated with pid and delete it */
struct uevent_msg *msg;
- struct sysinfo info;
list_for_each_entry(msg, &running_list, node) {
if (msg->pid == pid) {
- sysinfo(&info);
- if (msg->queue_time)
- info("seq %llu, pid [%d] exit, %ld seconds old", msg->seqnum, msg->pid, info.uptime - msg->queue_time);
- else
- info("seq 0, pid [%d] exit", msg->pid);
+ info("seq %llu, pid [%d] exit with %i, %ld seconds old", msg->seqnum, msg->pid,
+ exitstatus, time(NULL) - msg->queue_time);
+ msg->exitstatus = exitstatus;
msg_queue_delete(msg);
- /* we want to run the exec queue manager since there may
- * be events waiting with the devpath of the one that
- * just finished
- */
+ /* there may be events waiting with the same devpath */
run_exec_q = 1;
return;
}
static void reap_sigchilds(void)
{
pid_t pid;
+ int status;
while (1) {
- pid = waitpid(-1, NULL, WNOHANG);
+ pid = waitpid(-1, &status, WNOHANG);
if (pid <= 0)
break;
- udev_done(pid);
+ if (WIFEXITED(status))
+ status = WEXITSTATUS(status);
+ else if (WIFSIGNALED(status))
+ status = WTERMSIG(status) + 128;
+ else
+ status = 0;
+ udev_done(pid, status);
}
}
udevd_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (udevd_sock == -1) {
- err("error getting socket, %s", strerror(errno));
+ err("error getting socket: %s", strerror(errno));
return -1;
}
/* the bind takes care of ensuring only one copy running */
retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen);
if (retval < 0) {
- err("bind failed, %s", strerror(errno));
- close(udevd_sock);
+ err("bind failed: %s", strerror(errno));
return -1;
}
uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (uevent_netlink_sock == -1) {
- err("error getting socket, %s", strerror(errno));
+ err("error getting socket: %s", strerror(errno));
return -1;
}
/* set receive buffersize */
setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
- retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
- sizeof(struct sockaddr_nl));
+ retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
if (retval < 0) {
- err("bind failed, %s", strerror(errno));
+ err("bind failed: %s", strerror(errno));
close(uevent_netlink_sock);
uevent_netlink_sock = -1;
return -1;
}
-
return 0;
}
int main(int argc, char *argv[], char *envp[])
{
int retval;
- int devnull;
+ int fd;
struct sigaction act;
fd_set readfds;
const char *value;
- int uevent_netlink_active = 0;
int daemonize = 0;
int i;
-
- /* set std fd's to /dev/null, if the kernel forks us, we don't have them at all */
- devnull = open("/dev/null", O_RDWR);
- if (devnull >= 0) {
- if (devnull != STDIN_FILENO)
- dup2(devnull, STDIN_FILENO);
- if (devnull != STDOUT_FILENO)
- dup2(devnull, STDOUT_FILENO);
- if (devnull != STDERR_FILENO)
- dup2(devnull, STDERR_FILENO);
- if (devnull > STDERR_FILENO)
- close(devnull);
+ int rc = 0;
+ int maxfd;
+
+ /* redirect std fd's, if the kernel forks us, we don't have them at all */
+ fd = open("/dev/null", O_RDWR);
+ if (fd >= 0) {
+ if (fd != STDIN_FILENO)
+ dup2(fd, STDIN_FILENO);
+ if (fd != STDOUT_FILENO)
+ dup2(fd, STDOUT_FILENO);
+ if (fd != STDERR_FILENO)
+ dup2(fd, STDERR_FILENO);
+ if (fd > STDERR_FILENO)
+ close(fd);
}
logging_init("udevd");
- if (devnull < 0)
- err("fatal, could not open /dev/null");
+ if (fd < 0)
+ err("fatal, could not open /dev/null: %s", strerror(errno));
udev_init_config();
dbg("version %s", UDEV_VERSION);
goto exit;
}
+ /* parse commandline options */
for (i = 1 ; i < argc; i++) {
char *arg = argv[i];
if (strcmp(arg, "--daemon") == 0 || strcmp(arg, "-d") == 0) {
}
}
+ /* init sockets to receive events */
+ if (init_udevd_socket() < 0) {
+ if (errno == EADDRINUSE) {
+ err("another udevd running, exit");
+ rc = 1;
+ } else {
+ err("error initializing udevd socket: %s", strerror(errno));
+ rc = 2;
+ }
+ goto exit;
+ }
+
+ if (init_uevent_netlink_sock() < 0) {
+ err("uevent socket not available");
+ rc = 3;
+ goto exit;
+ }
+
+ /* parse the rules and keep it in memory */
+ udev_rules_init(&rules, 1);
+
if (daemonize) {
pid_t pid;
pid = fork();
switch (pid) {
case 0:
- dbg("damonized fork running");
+ dbg("daemonized fork running");
break;
case -1:
- err("fork of daemon failed");
+ err("fork of daemon failed: %s", strerror(errno));
+ rc = 4;
goto exit;
default:
- logging_close();
- exit(0);
+ dbg("child [%u] running, parent exits", pid);
+ goto exit;
}
}
+ /* set scheduling priority for the daemon */
+ setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
+
+ chdir("/");
+ umask(022);
+
/* become session leader */
sid = setsid();
dbg("our session is %d", sid);
- chdir("/");
- umask(umask(077) | 022);
-
- /* set a reasonable scheduling priority for the daemon */
- setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
+ /* OOM_DISABLE == -17 */
+ fd = open("/proc/self/oom_adj", O_RDWR);
+ if (fd < 0)
+ err("error disabling OOM: %s", strerror(errno));
+ else {
+ write(fd, "-17", 3);
+ close(fd);
+ }
/* setup signal handler pipe */
retval = pipe(signal_pipe);
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
- sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
sigaction(SIGHUP, &act, NULL);
- /* parse the rules and keep it in memory */
- udev_rules_init(&rules, 0, 1);
-
- if (init_udevd_socket() < 0) {
- if (errno == EADDRINUSE)
- dbg("another udevd running, exit");
- else
- dbg("error initializing udevd socket: %s", strerror(errno));
-
- goto exit;
- }
-
- if (init_uevent_netlink_sock() < 0)
- err("uevent socket not available");
-
/* watch rules directory */
inotify_fd = inotify_init();
if (inotify_fd > 0)
inotify_add_watch(inotify_fd, udev_rules_filename, IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
- /* init of expected_seqnum value */
- value = getenv("UDEVD_EXPECTED_SEQNUM");
- if (value) {
- expected_seqnum = strtoull(value, NULL, 10);
- info("initialize expected_seqnum to %llu", expected_seqnum);
- }
-
- /* timeout to wait for missing events */
- value = getenv("UDEVD_EVENT_TIMEOUT");
- if (value)
- event_timeout = strtoul(value, NULL, 10);
- else
- event_timeout = UDEVD_EVENT_TIMEOUT;
- info("initialize event_timeout to %u", event_timeout);
-
/* maximum limit of forked childs */
value = getenv("UDEVD_MAX_CHILDS");
if (value)
sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
putenv(udev_log);
+ maxfd = udevd_sock;
+ maxfd = UDEV_MAX(maxfd, uevent_netlink_sock);
+ maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
+ maxfd = UDEV_MAX(maxfd, inotify_fd);
+
while (!udev_exit) {
struct uevent_msg *msg;
int fdcount;
FD_ZERO(&readfds);
FD_SET(signal_pipe[READ_END], &readfds);
FD_SET(udevd_sock, &readfds);
- if (uevent_netlink_sock > 0)
- FD_SET(uevent_netlink_sock, &readfds);
+ FD_SET(uevent_netlink_sock, &readfds);
if (inotify_fd > 0)
FD_SET(inotify_fd, &readfds);
- fdcount = select(UDEV_MAX(uevent_netlink_sock, inotify_fd)+1, &readfds, NULL, NULL, NULL);
+ fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
if (fdcount < 0) {
if (errno != EINTR)
- dbg("error in select: %s", strerror(errno));
+ err("error in select: %s", strerror(errno));
continue;
}
/* get user socket message */
if (FD_ISSET(udevd_sock, &readfds)) {
msg = get_udevd_msg();
- if (msg) {
- /* discard kernel messages if netlink is active */
- if (uevent_netlink_active && msg->type == UDEVD_UEVENT_UDEVSEND && msg->seqnum != 0) {
- info("skip uevent_helper message with SEQNUM, netlink is active");
- free(msg);
- } else
- msg_queue_insert(msg);
- }
+ if (msg)
+ msg_queue_insert(msg);
}
/* get kernel netlink message */
- if ((uevent_netlink_sock > 0) && FD_ISSET(uevent_netlink_sock, &readfds)) {
+ if (FD_ISSET(uevent_netlink_sock, &readfds)) {
msg = get_netlink_msg();
- if (msg) {
+ if (msg)
msg_queue_insert(msg);
- /* disable udevsend with first netlink message */
- if (!uevent_netlink_active) {
- info("uevent_nl message received, disable udevsend messages");
- uevent_netlink_active = 1;
- }
- }
}
/* received a signal, clear our notification pipe */
if (reload_config) {
reload_config = 0;
udev_rules_close(&rules);
- udev_rules_init(&rules, 0, 1);
+ udev_rules_init(&rules, 1);
}
- /* forked child have returned */
+ /* forked child has returned */
if (sigchilds_waiting) {
sigchilds_waiting = 0;
reap_sigchilds();
}
- if (run_msg_q) {
- run_msg_q = 0;
- msg_queue_manager();
- }
-
if (run_exec_q) {
- /* clean up running_list before calling exec_queue_manager() */
- if (sigchilds_waiting) {
- sigchilds_waiting = 0;
- reap_sigchilds();
- }
-
run_exec_q = 0;
if (!stop_exec_q)
- exec_queue_manager();
+ msg_queue_manager();
}
}
logging_close();
- return 0;
+ return rc;
}
~ianmdlvl / elogind.git / blobdiff