libudev: add udev event monitor API

1 files changed, 108 insertions, 31 deletions

diff --git a/udev/lib/test-libudev.c b/udev/lib/test-libudev.c
index e86c660e64..3c38600192 100644
--- a/udev/lib/test-libudev.c
+++ b/udev/lib/test-libudev.c
@@ -21,6 +21,11 @@
 
 #include <stdio.h>
 #include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/select.h>
+
 #include "libudev.h"
 
 static void log_fn(struct udev *udev,
@@ -31,9 +36,49 @@ static void log_fn(struct udev *udev,
 	vprintf(format, args);
 }
 
-static int devlinks_cb(struct udev_device *udev_device, const char *value, void *data)
+static int print_devlinks_cb(struct udev_device *udev_device, const char *value, void *data)
 {
-	printf("link: %s\n", value);
+	printf("link:      '%s'\n", value);
+	return 0;
+}
+
+static int print_properties_cb(struct udev_device *udev_device, const char *key, const char *value, void *data)
+{
+	printf("property:  '%s=%s'\n", key, value);
+	return 0;
+}
+
+static void print_device(struct udev_device *device)
+{
+	const char *str;
+	int count;
+
+	printf("*** device: %p ***\n", device);
+	str = udev_device_get_devpath(device);
+	printf("devpath:   '%s'\n", str);
+	str = udev_device_get_subsystem(device);
+	printf("subsystem: '%s'\n", str);
+	str = udev_device_get_devname(device);
+	printf("devname:   '%s'\n", str);
+	count = udev_device_get_devlinks(device, print_devlinks_cb, NULL);
+	printf("found %i links\n", count);
+	count = udev_device_get_properties(device, print_properties_cb, NULL);
+	printf("found %i properties\n", count);
+	printf("\n");
+}
+
+static int test_device(struct udev *udev, const char *devpath)
+{
+	struct udev_device *device;
+
+	printf("looking at device: %s\n", devpath);
+	device = udev_device_new_from_devpath(udev, devpath);
+	if (device == NULL) {
+		printf("no device\n");
+		return -1;
+	}
+	print_device(device);
+	udev_device_unref(device);
 	return 0;
 }
 
@@ -41,28 +86,79 @@ static int devices_enum_cb(struct udev *udev,
 			   const char *devpath, const char *subsystem, const char *name,
 			   void *data)
 {
-	printf("device: %s (%s) %s\n", devpath, subsystem, name);
+	printf("device:    '%s' (%s) '%s'\n", devpath, subsystem, name);
 	return 0;
 }
 
-static int properties_cb(struct udev_device *udev_device, const char *key, const char *value, void *data)
+static int test_enumerate(struct udev *udev, const char *subsystem)
 {
-	printf("property: %s=%s\n", key, value);
+	int count;
+
+	count = udev_devices_enumerate(udev, subsystem, devices_enum_cb, NULL);
+	printf("found %i devices\n\n", count);
+	return count;
+}
+
+static int test_monitor(struct udev *udev, const char *socket_path)
+{
+	struct udev_monitor *udev_monitor;
+	fd_set readfds;
+	int fd;
+
+	udev_monitor = udev_monitor_new_from_socket(udev, socket_path);
+	if (udev_monitor == NULL) {
+		printf("no socket\n");
+		return -1;
+	}
+
+	fd = udev_monitor_get_fd(udev_monitor);
+	FD_ZERO(&readfds);
+
+	while (1) {
+		struct udev_device *device;
+		int fdcount;
+
+		FD_SET(STDIN_FILENO, &readfds);
+		FD_SET(fd, &readfds);
+
+		printf("waiting for events on %s, press ENTER to exit\n", socket_path);
+		fdcount = select(fd+1, &readfds, NULL, NULL, NULL);
+		printf("select fd count: %i\n", fdcount);
+
+		if (FD_ISSET(fd, &readfds)) {
+			device = udev_monitor_get_device(udev_monitor);
+			if (device == NULL) {
+				printf("no device from socket\n");
+				continue;
+			}
+			print_device(device);
+			udev_device_unref(device);
+		}
+
+		if (FD_ISSET(STDIN_FILENO, &readfds)) {
+			printf("exiting loop\n");
+			break;
+		}
+	}
+
+	udev_monitor_unref(udev_monitor);
 	return 0;
 }
 
 int main(int argc, char *argv[], char *envp[])
 {
 	struct udev *udev;
-	struct udev_device *device;
-	const char *str;
 	const char *devpath = "/devices/virtual/mem/null";
 	const char *subsystem = NULL;
+	const char *socket = "@/org/kernel/udev/monitor";
+	const char *str;
 
 	if (argv[1] != NULL) {
 		devpath = argv[1];
 		if (argv[2] != NULL)
 			subsystem = argv[2];
+			if (argv[3] != NULL)
+				socket = argv[3];
 	}
 
 	udev = udev_new();
@@ -75,32 +171,13 @@ int main(int argc, char *argv[], char *envp[])
 	printf("set log: %p\n", log_fn);
 
 	str = udev_get_sys_path(udev);
-	printf("sys_path: %s\n", str);
+	printf("sys_path: '%s'\n", str);
 	str = udev_get_dev_path(udev);
-	printf("dev_path: %s\n", str);
-
-	printf("looking at device: %s\n", devpath);
-	device = udev_device_new_from_devpath(udev, devpath);
-	printf("device: %p\n", device);
-	if (device == NULL) {
-		printf("no device\n");
-		return 1;
-	}
-	str = udev_device_get_devpath(device);
-	printf("devpath: %s\n", str);
-	str = udev_device_get_subsystem(device);
-	printf("subsystem: %s\n", str);
-	str = udev_device_get_devname(device);
-	printf("devname: %s\n", str);
-	udev_device_get_devlinks(device, devlinks_cb, NULL);
-	udev_device_get_properties(device, properties_cb, NULL);
-	udev_device_unref(device);
+	printf("dev_path: '%s'\n", str);
 
-	if (subsystem == NULL)
-		printf("enumerating devices from all subsystems\n");
-	else
-		printf("enumerating devices from subsystem: %s\n", subsystem);
-	udev_devices_enumerate(udev, subsystem, devices_enum_cb, NULL);
+	test_device(udev, devpath);
+	test_enumerate(udev, subsystem);
+	test_monitor(udev, socket);
 
 	udev_unref(udev);
 	return 0;