#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <time.h>
+#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
-#include <sys/time.h>
+#include <fcntl.h>
+#include <sys/sysinfo.h>
+#include <sys/stat.h>
#include "list.h"
#include "udev.h"
#include "udevd.h"
#include "logging.h"
-static int expected_seqnum = 0;
-volatile static int children_waiting;
-volatile static int msg_q_timeout;
+/* global variables*/
+static int udevsendsock;
+
+static int pipefds[2];
+static unsigned long long expected_seqnum = 0;
+static volatile int sigchilds_waiting;
+static volatile int run_msg_q;
+static volatile int sig_flag;
+static int run_exec_q;
-LIST_HEAD(msg_list);
-LIST_HEAD(exec_list);
-LIST_HEAD(running_list);
+static LIST_HEAD(msg_list);
+static LIST_HEAD(exec_list);
+static LIST_HEAD(running_list);
static void exec_queue_manager(void);
static void msg_queue_manager(void);
+static void user_sighandler(void);
+static void reap_sigchilds(void);
+char *udev_bin;
#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
}
#endif
+#define msg_dump(msg) \
+ dbg("msg_dump: sequence %llu, '%s', '%s', '%s'", \
+ msg->seqnum, msg->action, msg->devpath, msg->subsystem);
+
static void msg_dump_queue(void)
{
+#ifdef DEBUG
struct hotplug_msg *msg;
list_for_each_entry(msg, &msg_list, list)
- dbg("sequence %d in queue", msg->seqnum);
-}
-
-static void msg_dump(struct hotplug_msg *msg)
-{
- dbg("sequence %d, '%s', '%s', '%s'",
- msg->seqnum, msg->action, msg->devpath, msg->subsystem);
-}
-
-static struct hotplug_msg *msg_create(void)
-{
- struct hotplug_msg *new_msg;
-
- new_msg = malloc(sizeof(struct hotplug_msg));
- if (new_msg == NULL)
- dbg("error malloc");
- return new_msg;
+ dbg("sequence %llu in queue", msg->seqnum);
+#endif
}
static void run_queue_delete(struct hotplug_msg *msg)
{
list_del(&msg->list);
free(msg);
- exec_queue_manager();
}
/* orders the message in the queue by sequence number */
static void msg_queue_insert(struct hotplug_msg *msg)
{
struct hotplug_msg *loop_msg;
+ struct sysinfo info;
- /* sort message by sequence number into list*/
- list_for_each_entry(loop_msg, &msg_list, list)
- if (loop_msg->seqnum > msg->seqnum)
+ /* 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 (loop_msg->seqnum < msg->seqnum)
break;
- list_add_tail(&msg->list, &loop_msg->list);
- dbg("queued message seq %d", msg->seqnum);
/* store timestamp of queuing */
- msg->queue_time = time(NULL);
+ sysinfo(&info);
+ msg->queue_time = info.uptime;
+
+ list_add(&msg->list, &loop_msg->list);
+ dbg("queued message seq %llu", msg->seqnum);
/* run msg queue manager */
- msg_queue_manager();
+ run_msg_q = 1;
return ;
}
static void udev_run(struct hotplug_msg *msg)
{
pid_t pid;
- char action[ACTION_SIZE];
- char devpath[DEVPATH_SIZE];
- char *env[] = { action, devpath, NULL };
-
- snprintf(action, sizeof(action), "ACTION=%s", msg->action);
- snprintf(devpath, sizeof(devpath), "DEVPATH=%s", msg->devpath);
pid = fork();
switch (pid) {
case 0:
/* child */
- execle(UDEV_BIN, "udev", msg->subsystem, NULL, env);
+ close(udevsendsock);
+ logging_close();
+ execle(udev_bin, "udev", msg->subsystem, NULL, msg->envp);
dbg("exec of child failed");
- exit(1);
+ _exit(1);
break;
case -1:
dbg("fork of child failed");
run_queue_delete(msg);
+ /* note: we never managed to run, so we had no impact on
+ * running_with_devpath(), so don't bother setting run_exec_q
+ */
break;
default:
/* get SIGCHLD in main loop */
- dbg("==> exec seq %d [%d] working at '%s'", msg->seqnum, pid, msg->devpath);
+ dbg("==> exec seq %llu [%d] working at '%s'", msg->seqnum, pid, msg->devpath);
msg->pid = pid;
}
}
static struct hotplug_msg *running_with_devpath(struct hotplug_msg *msg)
{
struct hotplug_msg *loop_msg;
- list_for_each_entry(loop_msg, &running_list, list)
- if (strncmp(loop_msg->devpath, msg->devpath, sizeof(loop_msg->devpath)) == 0)
+ list_for_each_entry(loop_msg, &running_list, list) {
+ if (loop_msg->devpath == NULL || msg->devpath == NULL)
+ continue;
+
+ if (strcmp(loop_msg->devpath, msg->devpath) == 0)
return loop_msg;
+ }
+
return NULL;
}
/* exec queue management routine executes the events and delays events for the same devpath */
-static void exec_queue_manager()
+static void exec_queue_manager(void)
{
struct hotplug_msg *loop_msg;
struct hotplug_msg *tmp_msg;
/* move event to run list */
list_move_tail(&loop_msg->list, &running_list);
udev_run(loop_msg);
- dbg("moved seq %d to running list", loop_msg->seqnum);
+ dbg("moved seq %llu to running list", loop_msg->seqnum);
} else {
- dbg("delay seq %d, cause seq %d already working on '%s'",
+ dbg("delay seq %llu, cause seq %llu already working on '%s'",
loop_msg->seqnum, msg->seqnum, msg->devpath);
}
}
static void msg_move_exec(struct hotplug_msg *msg)
{
list_move_tail(&msg->list, &exec_list);
- exec_queue_manager();
+ run_exec_q = 1;
expected_seqnum = msg->seqnum+1;
- dbg("moved seq %d to exec, next expected is %d",
+ 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()
+static void msg_queue_manager(void)
{
struct hotplug_msg *loop_msg;
struct hotplug_msg *tmp_msg;
- time_t msg_age = 0;
+ struct sysinfo info;
+ long msg_age = 0;
- dbg("msg queue manager, next expected is %d", expected_seqnum);
+ dbg("msg queue manager, next expected is %llu", expected_seqnum);
recheck:
list_for_each_entry_safe(loop_msg, tmp_msg, &msg_list, list) {
/* move event with expected sequence to the exec list */
}
/* move event with expired timeout to the exec list */
- msg_age = time(NULL) - loop_msg->queue_time;
+ sysinfo(&info);
+ msg_age = info.uptime - loop_msg->queue_time;
+ dbg("seq %llu is %li seconds old", loop_msg->seqnum, msg_age);
if (msg_age > EVENT_TIMEOUT_SEC-1) {
msg_move_exec(loop_msg);
goto recheck;
msg_dump_queue();
+ /* set timeout for remaining queued events */
if (list_empty(&msg_list) == 0) {
- /* set timeout for remaining queued events */
struct itimerval itv = {{0, 0}, {EVENT_TIMEOUT_SEC - msg_age, 0}};
- dbg("next event expires in %li seconds",
- EVENT_TIMEOUT_SEC - msg_age);
- setitimer(ITIMER_REAL, &itv, 0);
+ dbg("next event expires in %li seconds", EVENT_TIMEOUT_SEC - msg_age);
+ setitimer(ITIMER_REAL, &itv, NULL);
}
}
/* receive the msg, do some basic sanity checks, and queue it */
-static void handle_msg(int sock)
+static void handle_udevsend_msg(int sock)
{
+ static struct udevsend_msg usend_msg;
struct hotplug_msg *msg;
- int retval;
+ int bufpos;
+ int i;
+ ssize_t size;
struct msghdr smsg;
struct cmsghdr *cmsg;
struct iovec iov;
struct ucred *cred;
char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
+ int envbuf_size;
- msg = msg_create();
- if (msg == NULL) {
- dbg("unable to store message");
- return;
- }
-
- iov.iov_base = msg;
- iov.iov_len = sizeof(struct hotplug_msg);
+ memset(&usend_msg, 0x00, sizeof(struct udevsend_msg));
+ iov.iov_base = &usend_msg;
+ iov.iov_len = sizeof(struct udevsend_msg);
memset(&smsg, 0x00, sizeof(struct msghdr));
smsg.msg_iov = &iov;
smsg.msg_control = cred_msg;
smsg.msg_controllen = sizeof(cred_msg);
- retval = recvmsg(sock, &smsg, 0);
- if (retval < 0) {
+ size = recvmsg(sock, &smsg, 0);
+ if (size < 0) {
if (errno != EINTR)
dbg("unable to receive message");
return;
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
dbg("no sender credentials received, message ignored");
- goto skip;
+ goto exit;
}
if (cred->uid != 0) {
dbg("sender uid=%i, message ignored", cred->uid);
- goto skip;
+ goto exit;
}
- if (strncmp(msg->magic, UDEV_MAGIC, sizeof(UDEV_MAGIC)) != 0 ) {
- dbg("message magic '%s' doesn't match, ignore it", msg->magic);
- goto skip;
+ 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;
}
+ envbuf_size = size - offsetof(struct udevsend_msg, envbuf);
+ dbg("envbuf_size=%i", envbuf_size);
+ msg = malloc(sizeof(struct hotplug_msg) + envbuf_size);
+ memset(msg, 0x00, sizeof(struct hotplug_msg) + envbuf_size);
+
+ /* copy environment buffer and reconstruct envp */
+ memcpy(msg->envbuf, usend_msg.envbuf, envbuf_size);
+ bufpos = 0;
+ for (i = 0; (bufpos < envbuf_size) && (i < HOTPLUG_NUM_ENVP-2); i++) {
+ int keylen;
+ char *key;
+
+ key = &msg->envbuf[bufpos];
+ keylen = strlen(key);
+ msg->envp[i] = key;
+ bufpos += keylen + 1;
+ dbg("add '%s' to msg.envp[%i]", msg->envp[i], i);
+
+ /* remember some keys for further processing */
+ if (strncmp(key, "ACTION=", 7) == 0)
+ msg->action = &key[7];
+
+ if (strncmp(key, "DEVPATH=", 8) == 0)
+ msg->devpath = &key[8];
+
+ if (strncmp(key, "SUBSYSTEM=", 10) == 0)
+ msg->subsystem = &key[10];
+
+ if (strncmp(key, "SEQNUM=", 7) == 0)
+ msg->seqnum = strtoull(&key[7], NULL, 10);
+ }
+ msg->envp[i++] = "MANAGED_EVENT=1";
+ msg->envp[i] = NULL;
+
/* if no seqnum is given, we move straight to exec queue */
- if (msg->seqnum == -1) {
+ if (msg->seqnum == 0) {
list_add(&msg->list, &exec_list);
- exec_queue_manager();
+ run_exec_q = 1;
} else {
msg_queue_insert(msg);
}
- return;
-skip:
- free(msg);
+exit:
return;
}
-static void sig_handler(int signum)
+static void asmlinkage sig_handler(int signum)
{
+ int rc;
+
switch (signum) {
case SIGINT:
case SIGTERM:
exit(20 + signum);
break;
case SIGALRM:
- msg_q_timeout = 1;
+ /* set flag, then write to pipe if needed */
+ run_msg_q = 1;
+ goto do_write;
break;
case SIGCHLD:
- children_waiting = 1;
+ /* set flag, then write to pipe if needed */
+ sigchilds_waiting = 1;
+ goto do_write;
break;
- default:
- dbg("unhandled signal");
+ }
+
+do_write:
+ /* if pipe is empty, write to pipe to force select to return
+ * immediately when it gets called
+ */
+ if (!sig_flag) {
+ rc = write(pipefds[1],&signum,sizeof(signum));
+ if (rc >= 0)
+ sig_flag = 1;
}
}
list_for_each_entry(msg, &running_list, list) {
if (msg->pid == pid) {
- dbg("<== exec seq %d came back", msg->seqnum);
+ dbg("<== exec seq %llu came back", msg->seqnum);
run_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
+ */
+ run_exec_q = 1;
return;
}
}
}
-int main(int argc, char *argv[])
+static void reap_sigchilds(void)
{
- int ssock;
+ while(1) {
+ int pid = waitpid(-1, NULL, WNOHANG);
+ if ((pid == -1) || (pid == 0))
+ break;
+ udev_done(pid);
+ }
+}
+
+/* just read everything from the pipe and clear the flag,
+ * the flags was set in the signal handler
+ */
+static void user_sighandler(void)
+{
+ int sig;
+ while(1) {
+ int rc = read(pipefds[0], &sig, sizeof(sig));
+ if (rc < 0)
+ break;
+
+ sig_flag = 0;
+ }
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+ int maxsockplus;
struct sockaddr_un saddr;
socklen_t addrlen;
- int retval;
- const int on = 1;
+ int retval, fd;
+ const int feature_on = 1;
struct sigaction act;
+ fd_set readfds;
- init_logging("udevd");
+ logging_init("udevd");
dbg("version %s", UDEV_VERSION);
if (getuid() != 0) {
dbg("need to be root, exit");
- exit(1);
+ goto exit;
+ }
+
+ /* 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 ) {
+ 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();
+
+ /* setup signal handler pipe */
+ retval = pipe(pipefds);
+ if (retval < 0) {
+ dbg("error getting pipes: %s", strerror(errno));
+ goto exit;
}
- /* set signal handler */
- act.sa_handler = sig_handler;
- sigemptyset (&act.sa_mask);
+ retval = fcntl(pipefds[0], F_SETFL, O_NONBLOCK);
+ if (retval < 0) {
+ dbg("error fcntl on read pipe: %s", strerror(errno));
+ goto exit;
+ }
+ retval = fcntl(pipefds[0], F_SETFD, FD_CLOEXEC);
+ 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) {
+ dbg("error fcntl on write pipe: %s", strerror(errno));
+ goto exit;
+ }
+ retval = fcntl(pipefds[1], F_SETFD, FD_CLOEXEC);
+ if (retval < 0) {
+ dbg("error fcntl on write pipe: %s", strerror(errno));
+ goto exit;
+ }
+
+ /* set signal handlers */
+ act.sa_handler = (void (*) (int))sig_handler;
+ sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
-
- /* we want these two to interrupt system calls */
- act.sa_flags = 0;
sigaction(SIGALRM, &act, NULL);
sigaction(SIGCHLD, &act, NULL);
strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
- ssock = socket(AF_LOCAL, SOCK_DGRAM, 0);
- if (ssock == -1) {
+ udevsendsock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (udevsendsock == -1) {
dbg("error getting socket, exit");
- exit(1);
+ goto exit;
}
/* the bind takes care of ensuring only one copy running */
- retval = bind(ssock, (struct sockaddr *) &saddr, addrlen);
+ 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(ssock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
-
+ 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)
+ dbg("udev binary is set to '%s'", udev_bin);
+ else
+ udev_bin = UDEV_BIN;
+
+ FD_ZERO(&readfds);
+ FD_SET(udevsendsock, &readfds);
+ FD_SET(pipefds[0], &readfds);
+ maxsockplus = udevsendsock+1;
while (1) {
- handle_msg(ssock);
+ fd_set workreadfds = readfds;
+ retval = select(maxsockplus, &workreadfds, NULL, NULL, NULL);
+
+ if (retval < 0) {
+ if (errno != EINTR)
+ dbg("error in select: %s", strerror(errno));
+ continue;
+ }
+
+ if (FD_ISSET(udevsendsock, &workreadfds))
+ handle_udevsend_msg(udevsendsock);
- while(msg_q_timeout) {
- msg_q_timeout = 0;
+ if (FD_ISSET(pipefds[0], &workreadfds))
+ user_sighandler();
+
+ if (sigchilds_waiting) {
+ sigchilds_waiting = 0;
+ reap_sigchilds();
+ }
+
+ if (run_msg_q) {
+ run_msg_q = 0;
msg_queue_manager();
}
- while(children_waiting) {
- children_waiting = 0;
- /* reap all dead children */
- while(1) {
- int pid = waitpid(-1, 0, WNOHANG);
- if ((pid == -1) || (pid == 0))
- break;
- udev_done(pid);
+ 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;
+ exec_queue_manager();
}
}
+
exit:
- close(ssock);
- exit(1);
+ logging_close();
+ return 1;
}
~ianmdlvl / elogind.git / blobdiff