X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev.c;h=b1ba1435e7236926e905e7f20959058954b906fe;hb=51737eb8b8087d3d9c0cbad8caeaed9efde907fe;hp=847cc5dade49bdf177082e5f8a4ae88110e70c9d;hpb=45a7b668eca398831c0cfc39e4237494b3d603e9;p=elogind.git

diff --git a/udev.c b/udev.c
index 847cc5dad..b1ba1435e 100644
--- a/udev.c
+++ b/udev.c
@@ -61,6 +61,10 @@ static int manage_hotplug_event(void) {
 	int fd;
 	int len;
 
+	/* false, if we are called directly */
+	if (!getenv("MANAGED_EVENT"))
+		goto exit;
+
 	fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
 	if (fd < 0)
 		goto exit;
@@ -103,25 +107,36 @@ int main(int argc, char *argv[], char *envp[])
 	const char *devpath = getenv("DEVPATH");
 	const char *subsystem = argv[1];
 
-	dbg("version %s", UDEV_VERSION);
+	if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+		printf("%s\n", UDEV_VERSION);
+		exit(0);
+	}
+
 	logging_init("udev");
+	dbg("version %s", UDEV_VERSION);
+
 	udev_init_config();
 
 	/* set signal handlers */
 	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);
 
+	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 (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 */