eudev/udev.h

/*
 * udev.h
 *
 * 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.
 *
 */

#ifndef UDEV_H
#define UDEV_H

#include <stdlib.h>
#include <string.h>
#include <sysfs/libsysfs.h>
#include <stddef.h>
#include <sys/param.h>

#define COMMENT_CHARACTER		'#'

#define NAME_SIZE	100
#define OWNER_SIZE	30
#define GROUP_SIZE	30
#define MODE_SIZE	8

#define ACTION_SIZE	30
#define DEVPATH_SIZE	255
#define SUBSYSTEM_SIZE	30

/* length of public data */
#define UDEVICE_LEN (offsetof(struct udevice, bus_id))

struct udevice {
	char name[NAME_SIZE];
	char owner[OWNER_SIZE];
	char group[GROUP_SIZE];
	char type;
	int major;
	int minor;
	unsigned int mode;	/* not mode_t due to conflicting definitions in different libcs */
	char symlink[NAME_SIZE];
	int partitions;

	/* private data that help us in building strings */
	char bus_id[SYSFS_NAME_LEN];
	char program_result[NAME_SIZE];
	char kernel_number[NAME_SIZE];
	char kernel_name[NAME_SIZE];
};

#define strfieldcpy(to, from) \
do { \
	to[sizeof(to)-1] = '\0'; \
	strncpy(to, from, sizeof(to)-1); \
} while (0)

#define strfieldcat(to, from) \
do { \
	to[sizeof(to)-1] = '\0'; \
	strncat(to, from, sizeof(to) - strlen(to)-1); \
} while (0)

#define strfieldcpymax(to, from, maxsize) \
do { \
	to[maxsize-1] = '\0'; \
	strncpy(to, from, maxsize-1); \
} while (0)

#define strfieldcatmax(to, from, maxsize) \
do { \
	to[maxsize-1] = '\0'; \
	strncat(to, from, maxsize - strlen(to)-1); \
} while (0)

#define strintcat(to, i) \
do { \
	to[sizeof(to)-1] = '\0'; \
	snprintf((to) + strlen(to), sizeof(to) - strlen(to)-1, "%u", i); \
} while (0)

#define strintcatmax(to, i, maxsize) \
do { \
	to[maxsize-1] = '\0'; \
	snprintf((to) + strlen(to), maxsize - strlen(to)-1, "%u", i); \
} while (0)

#define foreach_strpart(str, separator, pos, len) \
	for(pos = str, len = 0; \
	    (pos) < ((str) + strlen(str)); \
	    pos = pos + len + strspn(pos, separator), len = strcspn(pos, separator)) \
		if (len > 0)

static inline char *get_action(void)
{
	char *action;

	action = getenv("ACTION");
	if (action != NULL && strlen(action) > ACTION_SIZE)
		action[ACTION_SIZE-1] = '\0';

	return action;
}

static inline char *get_devpath(void)
{
	char *devpath;

	devpath = getenv("DEVPATH");
	if (devpath != NULL && strlen(devpath) > DEVPATH_SIZE)
		devpath[DEVPATH_SIZE-1] = '\0';

	return devpath;
}

static inline char *get_seqnum(void)
{
	char *seqnum;

	seqnum = getenv("SEQNUM");

	return seqnum;
}

static inline char *get_subsystem(char *subsystem)
{
	if (subsystem != NULL && strlen(subsystem) > SUBSYSTEM_SIZE)
		subsystem[SUBSYSTEM_SIZE-1] = '\0';

	return subsystem;
}

extern int udev_add_device(char *path, char *subsystem, int fake);
extern int udev_remove_device(char *path, char *subsystem);
extern void udev_init_config(void);
extern int parse_get_pair(char **orig_string, char **left, char **right);

extern char **main_argv;
extern char **main_envp;
extern char sysfs_path[SYSFS_PATH_MAX];
extern char udev_root[PATH_MAX];
extern char udev_db_filename[PATH_MAX+NAME_MAX];
extern char udev_permissions_filename[PATH_MAX+NAME_MAX];
extern char udev_config_filename[PATH_MAX+NAME_MAX];
extern char udev_rules_filename[PATH_MAX+NAME_MAX];
extern char default_mode_str[MODE_SIZE];
extern char default_owner_str[OWNER_SIZE];
extern char default_group_str[GROUP_SIZE];
extern int udev_log;
extern int udev_sleep;

#endif