replace libsysfs

We never used any of the libsysfs convenience features. Here we replace
it completely with 300 lines of code, which are much simpler and a bit
faster cause udev(d) does not open any syfs file for a simple event which
does not need any parent device information.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>

1 files changed, 77 insertions, 61 deletions

diff --git a/udev_device.c b/udev_device.c
index 7821c91cb4..0325001428 100644
--- a/udev_device.c
+++ b/udev_device.c
@@ -26,83 +26,99 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <ctype.h>
-#include <dirent.h>
-#include <syslog.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <sys/utsname.h>
-
-#include "udev_libc_wrapper.h"
+
 #include "udev.h"
-#include "logging.h"
-#include "udev_utils.h"
-#include "list.h"
+#include "udev_rules.h"
 
 
-int udev_init_device(struct udevice *udev, const char* devpath, const char *subsystem, const char *action)
+struct udevice *udev_device_init(void)
 {
-	char *pos;
+	struct udevice *udev;
 
+	udev = malloc(sizeof(struct udevice));
+	if (udev == NULL)
+		return NULL;
 	memset(udev, 0x00, sizeof(struct udevice));
+
 	INIT_LIST_HEAD(&udev->symlink_list);
 	INIT_LIST_HEAD(&udev->run_list);
 	INIT_LIST_HEAD(&udev->env_list);
 
-	if (subsystem)
-		strlcpy(udev->subsystem, subsystem, sizeof(udev->subsystem));
-
-	if (action)
-		strlcpy(udev->action, action, sizeof(udev->action));
-
-	if (devpath) {
-		strlcpy(udev->devpath, devpath, sizeof(udev->devpath));
-		remove_trailing_chars(udev->devpath, '/');
-
-		if (strncmp(udev->devpath, "/block/", 7) == 0)
-			udev->type = DEV_BLOCK;
-		else if (strncmp(udev->devpath, "/class/net/", 11) == 0)
-			udev->type = DEV_NET;
-		else if (strncmp(udev->devpath, "/class/", 7) == 0)
-			udev->type = DEV_CLASS;
-		else if (strncmp(udev->devpath, "/devices/", 9) == 0)
-			udev->type = DEV_DEVICE;
-
-		/* get kernel name */
-		pos = strrchr(udev->devpath, '/');
-		if (pos) {
-			strlcpy(udev->kernel_name, &pos[1], sizeof(udev->kernel_name));
-			dbg("kernel_name='%s'", udev->kernel_name);
-
-			/* Some block devices have '!' in their name, change that to '/' */
-			pos = udev->kernel_name;
-			while (pos[0] != '\0') {
-				if (pos[0] == '!')
-					pos[0] = '/';
-				pos++;
-			}
-
-			/* get kernel number */
-			pos = &udev->kernel_name[strlen(udev->kernel_name)];
-			while (isdigit(pos[-1]))
-				pos--;
-			strlcpy(udev->kernel_number, pos, sizeof(udev->kernel_number));
-			dbg("kernel_number='%s'", udev->kernel_number);
-		}
-	}
+	/* set sysfs device to local storage, can be overridden if needed */
+	udev->dev = &udev->dev_local;
 
-	if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) {
-		udev->mode = 0660;
-		strcpy(udev->owner, "root");
-		strcpy(udev->group, "root");
-	}
+	/* default node permissions */
+	udev->mode = 0660;
+	strcpy(udev->owner, "root");
+	strcpy(udev->group, "root");
 
-	return 0;
+	return udev;
 }
 
-void udev_cleanup_device(struct udevice *udev)
+void udev_device_cleanup(struct udevice *udev)
 {
 	name_list_cleanup(&udev->symlink_list);
 	name_list_cleanup(&udev->run_list);
 	name_list_cleanup(&udev->env_list);
+	free(udev);
+}
+
+dev_t udev_device_get_devt(struct udevice *udev)
+{
+	const char *attr;
+	unsigned int major, minor;
+
+	/* read it from sysfs  */
+	attr = sysfs_attr_get_value(udev->dev->devpath, "dev");
+	if (attr != NULL) {
+		if (sscanf(attr, "%u:%u", &major, &minor) == 2)
+			return makedev(major, minor);
+	}
+	return makedev(0, 0);
+}
+
+int udev_device_event(struct udev_rules *rules, struct udevice *udev)
+{
+	int retval = 0;
+
+	/* device node or netif */
+	if ((major(udev->devt) != 0 || strcmp(udev->dev->subsystem, "net") == 0) &&
+	    strcmp(udev->action, "add") == 0) {
+		dbg("device node or netif add '%s'", udev->dev->devpath);
+		udev_rules_get_name(rules, udev);
+		if (udev->ignore_device) {
+			info("device event will be ignored");
+			return 0;
+		}
+		/* create node, store in db */
+		if (udev->name[0] != '\0')
+			retval = udev_add_device(udev);
+		else
+			info("device node creation supressed");
+		return 0;
+	}
+
+	if (major(udev->devt) != 0 && strcmp(udev->action, "remove") == 0) {
+		struct name_entry *name_loop;
+
+		udev_rules_get_run(rules, udev);
+		if (udev->ignore_device) {
+			info("device event will be ignored");
+			return 0;
+		}
+		/* get data from db, remove db-entry, delete node */
+		retval = udev_remove_device(udev);
+
+		/* restore stored persistent data */
+		list_for_each_entry(name_loop, &udev->env_list, node)
+			putenv(name_loop->name);
+		return 0;
+	}
+
+	/* default devices */
+	udev_rules_get_run(rules, udev);
+	if (udev->ignore_device)
+		info("device event will be ignored");
+
+	return retval;
 }