[PATCH] split udev main logic into udev-add and udev-remove.

1 files changed, 200 insertions, 0 deletions

diff --git a/udev-add.c b/udev-add.c
new file mode 100644
index 0000000000..45ffbf81b5
--- /dev/null
+++ b/udev-add.c
@@ -0,0 +1,200 @@
+/*
+ * udev-add.c
+ *
+ * Userspace devfs
+ *
+ * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
+ *
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ * 
+ *	This program is distributed in the hope that it will be useful, but
+ *	WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *	General Public License for more details.
+ * 
+ *	You should have received a copy of the GNU General Public License along
+ *	with this program; if not, write to the Free Software Foundation, Inc.,
+ *	675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "udev.h"
+#include "udev_version.h"
+#include "namedev.h"
+#include "libsysfs/libsysfs.h"
+
+
+static char sysfs_path[SYSFS_PATH_MAX];
+
+/* 
+ * Right now the major/minor of a device is stored in a file called
+ * "dev" in sysfs.
+ * The number is stored as:
+ * 	MMmm
+ * 		MM is the major
+ * 		mm is the minor
+ * 		The value is in hex.
+ * Yes, this will probably change when we go to a bigger major/minor
+ * range, and will have to be changed at that time.
+ */
+static int get_major_minor(struct sysfs_class_device *class_dev, int *major, int *minor)
+{
+	char temp[3];
+	int retval = 0;
+
+	char *dev;
+
+	dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
+	if (dev == NULL)
+		return -ENODEV;
+
+	dbg("dev = %s", dev);
+
+	temp[0] = dev[0];
+	temp[1] = dev[1];
+	temp[2] = 0x00;
+	*major = (int)strtol(&temp[0], NULL, 16);
+
+	temp[0] = dev[2];
+	temp[1] = dev[3];
+	temp[2] = 0x00;
+	*minor = (int)strtol(&temp[0], NULL, 16);
+
+	dbg("found major = %d, minor = %d", *major, *minor);
+
+	retval = 0;
+	return retval;
+}
+
+/*
+ * We also want to add some permissions here, and possibly some symlinks
+ */
+static int create_node(char *name, char type, int major, int minor, int mode)
+{
+	char *argv[7];
+	char mode_string[100];
+	char type_string[3];
+	char major_string[20];
+	char minor_string[20];
+	char filename[255];
+	int retval = 0;
+
+	strncpy(filename, UDEV_ROOT, sizeof(filename));
+	strncat(filename, name, sizeof(filename));
+
+	snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
+	snprintf(type_string, sizeof(type_string), "%c", type);
+	snprintf(major_string, sizeof(major_string), "%d", major);
+	snprintf(minor_string, sizeof(minor_string), "%d", minor);
+	
+	argv[0] = MKNOD;
+	argv[1] = mode_string;
+	argv[2] = filename;
+	argv[3] = type_string;
+	argv[4] = major_string;
+	argv[5] = minor_string;
+	argv[6] = NULL;
+	dbg ("executing %s %s %s %s %s %s",
+		argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
+	switch (fork()) {
+		case 0:
+			/* we are the child, so lets run the program */
+			execv (MKNOD, argv);
+			exit(0);
+			break;
+		case (-1):
+			dbg ("fork failed.");
+			retval = -EFAULT;
+			break;
+		default:
+			break;
+	}
+	return retval;
+}
+
+struct sysfs_class_device *get_class_dev(char *device_name)
+{
+	char dev_path[SYSFS_PATH_MAX];
+	struct sysfs_class_device *class_dev;
+
+	strcpy(dev_path, sysfs_path);
+	strcat(dev_path, device_name);
+
+	dbg("looking at %s", dev_path);
+
+	/* open up the sysfs class device for this thing... */
+	class_dev = sysfs_open_class_device(dev_path);
+	if (class_dev == NULL) {
+		dbg ("sysfs_open_class_device failed");
+		return NULL;
+	}
+	dbg("class_dev->name = %s", class_dev->name);
+
+	return class_dev;
+}
+
+static int udev_init(void)
+{
+	int retval;
+
+	retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
+	dbg("sysfs_path = %s", sysfs_path);
+	return retval;
+}
+
+int udev_add_device(char *device, char *subsystem)
+{
+	struct sysfs_class_device *class_dev;
+	struct device_attr attr;
+	//char *name;
+	int major;
+	int minor;
+	char type;
+	//int mode;
+	int retval = -EINVAL;
+
+	/* sleep for a second or two to give the kernel a chance to
+	 * create the dev file
+	 */
+	sleep(1);
+
+	udev_init();
+
+	/* for now, the block layer is the only place where block devices are */
+	if (strcmp(subsystem, "block") == 0)
+		type = 'b';
+	else
+		type = 'c';
+
+	class_dev = get_class_dev(device);
+	if (class_dev == NULL)
+		goto exit;
+
+	retval = namedev_name_device(class_dev, &attr);
+	if (retval)
+		return retval;
+
+	retval = get_major_minor(class_dev, &major, &minor);
+	if (retval) {
+		dbg ("get_major_minor failed");
+		goto exit;
+	}
+
+	sysfs_close_class_device(class_dev);
+
+	return create_node(attr.name, type, major, minor, attr.mode);
+
+exit:
+	return retval;
+}
+