udev.h

   1 /*
   2  * udev.h
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  *
   8  *      This program is free software; you can redistribute it and/or modify it
   9  *      under the terms of the GNU General Public License as published by the
  10  *      Free Software Foundation version 2 of the License.
  11  *
  12  *      This program is distributed in the hope that it will be useful, but
  13  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *      General Public License for more details.
  16  *
  17  *      You should have received a copy of the GNU General Public License along
  18  *      with this program; if not, write to the Free Software Foundation, Inc.,
  19  *      675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #ifndef UDEV_H
  24 #define UDEV_H
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sysfs/libsysfs.h>
  29 #include <stddef.h>
  30 #include <sys/param.h>
  31
  32 #define COMMENT_CHARACTER               '#'
  33
  34 #define NAME_SIZE       100
  35 #define OWNER_SIZE      30
  36 #define GROUP_SIZE      30
  37 #define MODE_SIZE       8
  38
  39 #define ACTION_SIZE     30
  40 #define DEVPATH_SIZE    255
  41 #define SUBSYSTEM_SIZE  30
  42
  43 /* length of public data */
  44 #define UDEVICE_LEN (offsetof(struct udevice, bus_id))
  45
  46 struct udevice {
  47         char name[NAME_SIZE];
  48         char owner[OWNER_SIZE];
  49         char group[GROUP_SIZE];
  50         char type;
  51         int major;
  52         int minor;
  53         unsigned int mode;      /* not mode_t due to conflicting definitions in different libcs */
  54         char symlink[NAME_SIZE];
  55         int partitions;
  56
  57         /* private data that help us in building strings */
  58         char bus_id[SYSFS_NAME_LEN];
  59         char program_result[NAME_SIZE];
  60         char kernel_number[NAME_SIZE];
  61         char kernel_name[NAME_SIZE];
  62 };
  63
  64 #define strfieldcpy(to, from) \
  65 do { \
  66         to[sizeof(to)-1] = '\0'; \
  67         strncpy(to, from, sizeof(to)-1); \
  68 } while (0)
  69
  70 #define strfieldcat(to, from) \
  71 do { \
  72         to[sizeof(to)-1] = '\0'; \
  73         strncat(to, from, sizeof(to) - strlen(to)-1); \
  74 } while (0)
  75
  76 #define strfieldcpymax(to, from, maxsize) \
  77 do { \
  78         to[maxsize-1] = '\0'; \
  79         strncpy(to, from, maxsize-1); \
  80 } while (0)
  81
  82 #define strfieldcatmax(to, from, maxsize) \
  83 do { \
  84         to[maxsize-1] = '\0'; \
  85         strncat(to, from, maxsize - strlen(to)-1); \
  86 } while (0)
  87
  88 #define strintcat(to, i) \
  89 do { \
  90         to[sizeof(to)-1] = '\0'; \
  91         snprintf((to) + strlen(to), sizeof(to) - strlen(to)-1, "%u", i); \
  92 } while (0)
  93
  94 #define strintcatmax(to, i, maxsize) \
  95 do { \
  96         to[maxsize-1] = '\0'; \
  97         snprintf((to) + strlen(to), maxsize - strlen(to)-1, "%u", i); \
  98 } while (0)
  99
 100 #define foreach_strpart(str, separator, pos, len) \
 101         for(pos = str, len = 0; \
 102             (pos) < ((str) + strlen(str)); \
 103             pos = pos + len + strspn(pos, separator), len = strcspn(pos, separator)) \
 104                 if (len > 0)
 105
 106 static inline char *get_action(void)
 107 {
 108         char *action;
 109
 110         action = getenv("ACTION");
 111         if (action != NULL && strlen(action) > ACTION_SIZE)
 112                 action[ACTION_SIZE-1] = '\0';
 113
 114         return action;
 115 }
 116
 117 static inline char *get_devpath(void)
 118 {
 119         char *devpath;
 120
 121         devpath = getenv("DEVPATH");
 122         if (devpath != NULL && strlen(devpath) > DEVPATH_SIZE)
 123                 devpath[DEVPATH_SIZE-1] = '\0';
 124
 125         return devpath;
 126 }
 127
 128 static inline char *get_seqnum(void)
 129 {
 130         char *seqnum;
 131
 132         seqnum = getenv("SEQNUM");
 133
 134         return seqnum;
 135 }
 136
 137 static inline char *get_subsystem(char *subsystem)
 138 {
 139         if (subsystem != NULL && strlen(subsystem) > SUBSYSTEM_SIZE)
 140                 subsystem[SUBSYSTEM_SIZE-1] = '\0';
 141
 142         return subsystem;
 143 }
 144
 145 extern int udev_add_device(char *path, char *subsystem, int fake);
 146 extern int udev_remove_device(char *path, char *subsystem);
 147 extern void udev_init_config(void);
 148 extern int parse_get_pair(char **orig_string, char **left, char **right);
 149
 150 extern char **main_argv;
 151 extern char **main_envp;
 152 extern char sysfs_path[SYSFS_PATH_MAX];
 153 extern char udev_root[PATH_MAX];
 154 extern char udev_db_filename[PATH_MAX+NAME_MAX];
 155 extern char udev_permissions_filename[PATH_MAX+NAME_MAX];
 156 extern char udev_config_filename[PATH_MAX+NAME_MAX];
 157 extern char udev_rules_filename[PATH_MAX+NAME_MAX];
 158 extern char default_mode_str[MODE_SIZE];
 159 extern char default_owner_str[OWNER_SIZE];
 160 extern char default_group_str[GROUP_SIZE];
 161 extern int udev_log;
 162 extern int udev_sleep;
 163
 164 #endif