#include "libsysfs/sysfs/libsysfs.h"
#include "udev.h"
-#include "udev_lib.h"
+#include "udev_utils.h"
#include "udev_sysfs.h"
#include "udev_version.h"
#include "namedev.h"
#ifdef LOG
-unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
va_list args;
}
#endif
+/* decide if we should manage the whole hotplug event
+ * for now look if the kernel calls udevsend instead of /sbin/hotplug
+ */
+static int manage_hotplug_event(void) {
+ char helper[256];
+ int fd;
+ int len;
+
+ /* don't handle hotplug.d if we are called directly */
+ if (!getenv("UDEVD_EVENT"))
+ return 0;
+
+ fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
+ if (fd < 0)
+ return 0;
+
+ len = read(fd, helper, 256);
+ close(fd);
+
+ if (len < 0)
+ return 0;
+ helper[len] = '\0';
+
+ if (strstr(helper, "udevsend"))
+ return 1;
+
+ return 0;
+}
+
static void asmlinkage sig_handler(int signum)
{
switch (signum) {
struct sysfs_device *devices_dev;
struct udevice udev;
char path[SYSFS_PATH_MAX];
- int retval = -EINVAL;
const char *error;
- const char *action = getenv("ACTION");
- const char *devpath = getenv("DEVPATH");
- const char *subsystem = argv[1];
+ const char *action;
+ const char *devpath;
+ const char *subsystem;
+ int managed_event;
+ int retval = -EINVAL;
+
+ if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+ printf("%s\n", UDEV_VERSION);
+ exit(0);
+ }
- dbg("version %s", UDEV_VERSION);
logging_init("udev");
+ dbg("version %s", UDEV_VERSION);
+
udev_init_config();
/* set signal handlers */
+ memset(&act, 0x00, sizeof(act));
act.sa_handler = (void (*) (int))sig_handler;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
- /* alarm must not restart syscalls*/
sigaction(SIGALRM, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
- /* trigger timeout to interrupt blocking syscalls */
+ /* trigger timeout to prevent hanging processes */
alarm(ALARM_TIMEOUT);
- udev_set_values(&udev, devpath, subsystem, action);
-
- if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) {
+ if (strstr(argv[0], "udevstart") || (argc == 2 && strstr(argv[1], "udevstart"))) {
dbg("udevstart");
/* disable all logging, as it's much too slow on some facilities */
goto exit;
}
+ /* let the executed programs know if we handle the whole hotplug event */
+ managed_event = manage_hotplug_event();
+ if (managed_event)
+ setenv("MANAGED_EVENT", "1", 1);
+
+ action = getenv("ACTION");
+ devpath = getenv("DEVPATH");
+ subsystem = getenv("SUBSYSTEM");
+ /* older kernels passed the SUBSYSTEM only as argument */
+ if (!subsystem && argc == 2)
+ subsystem = argv[1];
+ udev_init_device(&udev, devpath, subsystem);
+
if (!action) {
dbg("no action");
- goto exit;
+ goto hotplug;
}
if (!subsystem) {
dbg("no subsystem");
- goto exit;
+ goto hotplug;
}
if (!devpath) {
dbg("no devpath");
- goto exit;
+ goto hotplug;
}
- /* export logging flag, called scripts may want to do the same as udev */
+ /* export logging flag, as called scripts may want to do the same as udev */
if (udev_log)
setenv("UDEV_LOG", "1", 1);
/* wait for sysfs and possibly add node */
dbg("udev add");
- /* skip blacklisted subsystems */
+ /* skip subsystems without "dev", but handle net devices */
if (udev.type != 'n' && subsystem_expect_no_dev(udev.subsystem)) {
dbg("don't care about '%s' devices", udev.subsystem);
- goto exit;
- };
+ goto hotplug;
+ }
snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
class_dev = wait_class_device_open(path);
if (class_dev == NULL) {
dbg ("open class device failed");
- goto exit;
+ goto hotplug;
}
dbg("opened class_dev->name='%s'", class_dev->name);
wait_for_class_device(class_dev, &error);
- /* init rules, permissions */
+ /* init rules */
namedev_init();
/* name, create node, store in db */
retval = udev_add_device(&udev, class_dev);
- /* run dev.d/ scripts if we created a node or changed a netif name */
- if (udev.devname[0] != '\0') {
- setenv("DEVNAME", udev.devname, 1);
- dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
- }
-
sysfs_close_class_device(class_dev);
} else if (strcmp(action, "remove") == 0) {
/* possibly remove a node */
dbg("udev remove");
- /* get node from db, delete it */
- retval = udev_remove_device(&udev);
-
- /* run dev.d/ scripts if we're not instructed to ignore the event */
- if (udev.devname[0] != '\0') {
- setenv("DEVNAME", udev.devname, 1);
- dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
+ /* skip subsystems without "dev" */
+ if (subsystem_expect_no_dev(udev.subsystem)) {
+ dbg("don't care about '%s' devices", udev.subsystem);
+ goto hotplug;
}
+ /* get node from db, remove db-entry, delete created node */
+ retval = udev_remove_device(&udev);
+ }
+
+ /* run dev.d/ scripts if we created/deleted a node or changed a netif name */
+ if (udev.devname[0] != '\0') {
+ setenv("DEVNAME", udev.devname, 1);
+ if (udev_dev_d)
+ udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
}
} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
if (strcmp(action, "add") == 0) {
devices_dev = wait_devices_device_open(path);
if (!devices_dev) {
dbg("devices device unavailable (probably remove has beaten us)");
- goto exit;
+ goto hotplug;
}
dbg("devices device opened '%s'", path);
dbg("unhandled");
}
+hotplug:
+ if (udev_hotplug_d && managed_event)
+ udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
+
exit:
logging_close();
return retval;