busctl: exit cleanly when the bus connection is severed

[elogind.git] / src / udev / udevd.c

diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index ab2b4ba61136d1865fb50f0b3425a282dc535615..009e39523c442b291b9728d7d1786a82f10412e2 100644 (file)
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -46,13 +46,14 @@
 #include <sys/inotify.h>
 #include <sys/utsname.h>
 
-#include "udev.h"
-#include "udev-util.h"
-#include "rtnl-util.h"
 #include "sd-daemon.h"
+#include "rtnl-util.h"
 #include "cgroup-util.h"
 #include "dev-setup.h"
 #include "fileio.h"
+#include "selinux-util.h"
+#include "udev.h"
+#include "udev-util.h"
 
 static struct udev_rules *rules;
 static struct udev_ctrl *udev_ctrl;
@@ -315,8 +316,9 @@ static void worker_new(struct event *event) {
                                                arg_event_timeout_usec, arg_event_timeout_warn_usec,
                                                &sigmask_orig);
 
-                        /* in case rtnl was initialized */
-                        rtnl = sd_rtnl_ref(udev_event->rtnl);
+                        if (udev_event->rtnl)
+                                /* in case rtnl was initialized */
+                                rtnl = sd_rtnl_ref(udev_event->rtnl);
 
                         /* apply/restore inotify watch */
                         if (udev_event->inotify_watch) {
@@ -815,41 +817,34 @@ static int synthesize_change(struct udev_device *dev) {
 }
 
 static int handle_inotify(struct udev *udev) {
-        int nbytes, pos;
-        char *buf;
-        struct inotify_event *ev;
-        int r;
+        union inotify_event_buffer buffer;
+        struct inotify_event *e;
+        ssize_t l;
 
-        r = ioctl(fd_inotify, FIONREAD, &nbytes);
-        if (r < 0 || nbytes <= 0)
-                return -errno;
+        l = read(fd_inotify, &buffer, sizeof(buffer));
+        if (l < 0) {
+                if (errno == EAGAIN || errno == EINTR)
+                        return 0;
 
-        buf = malloc(nbytes);
-        if (!buf) {
-                log_error("error getting buffer for inotify");
-                return -ENOMEM;
+                return log_error_errno(errno, "Failed to read inotify fd: %m");
         }
 
-        nbytes = read(fd_inotify, buf, nbytes);
-
-        for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
+        FOREACH_INOTIFY_EVENT(e, buffer, l) {
                 struct udev_device *dev;
 
-                ev = (struct inotify_event *)(buf + pos);
-                dev = udev_watch_lookup(udev, ev->wd);
+                dev = udev_watch_lookup(udev, e->wd);
                 if (!dev)
                         continue;
 
-                log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
-                if (ev->mask & IN_CLOSE_WRITE)
+                log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev));
+                if (e->mask & IN_CLOSE_WRITE)
                         synthesize_change(dev);
-                else if (ev->mask & IN_IGNORED)
+                else if (e->mask & IN_IGNORED)
                         udev_watch_end(udev, dev);
 
                 udev_device_unref(dev);
         }
 
-        free(buf);
         return 0;
 }
 
@@ -1009,14 +1004,15 @@ static void kernel_cmdline_options(struct udev *udev) {
 static void help(void) {
         printf("%s [OPTIONS...]\n\n"
                "Manages devices.\n\n"
-               "  --daemon\n"
-               "  --debug\n"
-               "  --children-max=<maximum number of workers>\n"
-               "  --exec-delay=<seconds to wait before executing RUN=>\n"
-               "  --event-timeout=<seconds to wait before terminating an event>\n"
-               "  --resolve-names=early|late|never\n"
-               "  --version\n"
-               "  --help\n"
+               "  -h --help                   Print this message\n"
+               "     --version                Print version of the program\n"
+               "     --daemon                 Detach and run in the background\n"
+               "     --debug                  Enable debug output\n"
+               "     --children-max=INT       Set maximum number of workers\n"
+               "     --exec-delay=SECONDS     Seconds to wait before executing RUN=\n"
+               "     --event-timeout=SECONDS  Seconds to wait before terminating an event\n"
+               "     --resolve-names=early|late|never\n"
+               "                              When to resolve users and groups\n"
                , program_invocation_short_name);
 }