udevdb.c

   1 /*
   2  * udevdb.c
   3  *
   4  * Userspace devfs
   5  *
   6  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2003 IBM Corp.
   8  *
   9  *      This program is free software; you can redistribute it and/or modify it
  10  *      under the terms of the GNU General Public License as published by the
  11  *      Free Software Foundation version 2 of the License.
  12  *
  13  *      This program is distributed in the hope that it will be useful, but
  14  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *      General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License along
  19  *      with this program; if not, write to the Free Software Foundation, Inc.,
  20  *      675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 /*
  25  * udev database library
  26  */
  27 #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <fcntl.h>
  31 #include <string.h>
  32 #include <sys/stat.h>
  33 #include <errno.h>
  34 #include <signal.h>
  35
  36 #include "udev_version.h"
  37 #include "udev.h"
  38 #include "namedev.h"
  39 #include "udevdb.h"
  40 #include "tdb/tdb.h"
  41 #include "libsysfs/libsysfs.h"
  42
  43 static TDB_CONTEXT *udevdb;
  44
  45
  46 int udevdb_add_dev(const char *path, const struct udevice *dev)
  47 {
  48         TDB_DATA key, data;
  49         char keystr[SYSFS_PATH_MAX];
  50
  51         if ((path == NULL) || (dev == NULL))
  52                 return -ENODEV;
  53
  54         memset(keystr, 0, NAME_SIZE);
  55         strcpy(keystr, path);
  56         key.dptr = keystr;
  57         key.dsize = strlen(keystr) + 1;
  58
  59         data.dptr = (void *)dev;
  60         data.dsize = sizeof(*dev);
  61
  62         return tdb_store(udevdb, key, data, TDB_REPLACE);
  63 }
  64
  65 int udevdb_get_dev(const char *path, struct udevice *dev)
  66 {
  67         TDB_DATA key, data;
  68
  69         if (path == NULL)
  70                 return -ENODEV;
  71
  72         key.dptr = (void *)path;
  73         key.dsize = strlen(path) + 1;
  74
  75         data = tdb_fetch(udevdb, key);
  76         if (data.dptr == NULL || data.dsize == 0)
  77                 return -ENODEV;
  78
  79         memcpy(dev, data.dptr, sizeof(*dev));
  80         return 0;
  81 }
  82
  83 int udevdb_delete_dev(const char *path)
  84 {
  85         TDB_DATA key;
  86         char keystr[SYSFS_PATH_MAX];
  87
  88         if (path == NULL)
  89                 return -EINVAL;
  90
  91         memset(keystr, 0, sizeof(keystr));
  92         strcpy(keystr, path);
  93
  94         key.dptr = keystr;
  95         key.dsize = strlen(keystr) + 1;
  96
  97         return tdb_delete(udevdb, key);
  98 }
  99
 100 /**
 101  * udevdb_exit: closes database
 102  */
 103 void udevdb_exit(void)
 104 {
 105         if (udevdb != NULL) {
 106                 tdb_close(udevdb);
 107                 udevdb = NULL;
 108         }
 109 }
 110
 111 /**
 112  * udevdb_init: initializes database
 113  * @init_flag: UDEVDB_INTERNAL - database stays in memory
 114  *             UDEVDB_DEFAULT - database is written to a file
 115  */
 116 int udevdb_init(int init_flag)
 117 {
 118         if (init_flag != UDEVDB_DEFAULT && init_flag != UDEVDB_INTERNAL)
 119                 return -EINVAL;
 120
 121         udevdb = tdb_open(udev_db_filename, 0, init_flag, O_RDWR | O_CREAT, 0644);
 122         if (udevdb == NULL) {
 123                 if (init_flag == UDEVDB_INTERNAL)
 124                         dbg("unable to initialize in-memory database");
 125                 else
 126                         dbg("unable to initialize database at '%s'", udev_db_filename);
 127                 return -EINVAL;
 128         }
 129         return 0;
 130 }
 131
 132 /**
 133  * udevdb_open_ro: open database for reading
 134  */
 135 int udevdb_open_ro(void)
 136 {
 137         udevdb = tdb_open(udev_db_filename, 0, 0, O_RDONLY, 0);
 138         if (udevdb == NULL) {
 139                 dbg("unable to open database at '%s'", udev_db_filename);
 140                 return -EINVAL;
 141         }
 142         return 0;
 143 }