lib/libc/gen/getvfsent.c

   1 /*
   2  * getvfsent.c - get a listing of installed filesystems
   3  * Written September 1994 by Garrett A. Wollman
   4  * This file is in the public domain.
   5  *
   6  * $FreeBSD: src/lib/libc/gen/getvfsent.c,v 1.14.2.1 2001/03/05 09:19:38 obrien Exp $
   7  * $DragonFly: src/lib/libc/gen/getvfsent.c,v 1.3 2005/04/26 06:16:29 joerg Exp $
   8  */
   9
  10 #include <sys/param.h>
  11 #include <sys/linker.h>
  12 #include <sys/mount.h>
  13 #include <sys/sysctl.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17
  18 /* XXX hide some compatibility problems. */
  19 #undef getvfsbyname
  20
  21 static struct ovfsconf *_vfslist = 0;
  22 static struct ovfsconf _vfsconf;
  23 static size_t _vfslistlen = 0;
  24 static int _vfs_keeplist = 0;
  25 static size_t _vfs_index = 0;
  26
  27 static int
  28 initvfs(void)
  29 {
  30         int mib[2] = { CTL_VFS, VFS_VFSCONF };
  31         size_t size = 0;
  32         int rv;
  33
  34         rv = sysctl(mib, 2, (void *)0, &size, (void *)0, (size_t)0);
  35         if(rv < 0)
  36                 return 0;
  37
  38         if(_vfslist)
  39                 free(_vfslist);
  40         _vfslist = malloc(size);
  41         if(!_vfslist)
  42                 return 0;
  43
  44         rv = sysctl(mib, 2, _vfslist, &size, (void *)0, (size_t)0);
  45         if(rv < 0) {
  46                 free(_vfslist);
  47                 _vfslist = 0;
  48                 return 0;
  49         }
  50
  51         _vfslistlen = size / sizeof(_vfslist[0]);
  52         return 1;
  53 }
  54
  55 struct ovfsconf *
  56 getvfsent(void)
  57 {
  58         if(!_vfslist && !initvfs())
  59                 return 0;
  60
  61         do {
  62                 if(_vfs_index >= _vfslistlen)
  63                         return 0;
  64
  65                 _vfsconf = _vfslist[_vfs_index++];
  66         } while(!_vfsconf.vfc_vfsops);
  67
  68         if(!_vfs_keeplist) {
  69                 free(_vfslist);
  70                 _vfslist = 0;
  71         }
  72         return &_vfsconf;
  73 }
  74
  75 struct ovfsconf *
  76 getvfsbyname(const char *name)
  77 {
  78         size_t i;
  79
  80         if(!_vfslist && !initvfs())
  81                 return 0;
  82
  83         for(i = 0; i < _vfslistlen; i++) {
  84                 if( ! strcmp(_vfslist[i].vfc_name, name) )
  85                         break;
  86         }
  87
  88         if(i < _vfslistlen)
  89                 _vfsconf = _vfslist[i];
  90
  91         if(!_vfs_keeplist) {
  92                 free(_vfslist);
  93                 _vfslist = 0;
  94         }
  95
  96         if(i < _vfslistlen)
  97                 return &_vfsconf;
  98         else
  99                 return 0;
 100 }
 101
 102 struct ovfsconf *
 103 getvfsbytype(int type)
 104 {
 105         size_t i;
 106
 107         if(!_vfslist && !initvfs())
 108                 return 0;
 109
 110         for(i = 0; i < _vfslistlen; i++) {
 111                 if(_vfslist[i].vfc_index == type)
 112                         break;
 113         }
 114
 115         if(i < _vfslistlen)
 116                 _vfsconf = _vfslist[i];
 117
 118         if(!_vfs_keeplist) {
 119                 free(_vfslist);
 120                 _vfslist = 0;
 121         }
 122
 123         if(i < _vfslistlen)
 124                 return &_vfsconf;
 125         else
 126                 return 0;
 127 }
 128
 129 void
 130 setvfsent(int keep)
 131 {
 132         if(_vfslist && !keep) {
 133                 free(_vfslist);
 134                 _vfslist = 0;
 135         }
 136
 137         _vfs_keeplist = keep;
 138         _vfs_index = 0;
 139 }
 140
 141 void
 142 endvfsent(void)
 143 {
 144         if(_vfslist) {
 145                 free(_vfslist);
 146                 _vfslist = 0;
 147         }
 148
 149         _vfs_index = 0;
 150 }
 151
 152 int
 153 vfsisloadable(const char *name __unused)
 154 {
 155         return 1;
 156 }
 157
 158 int
 159 vfsload(const char *name)
 160 {
 161         int status;
 162
 163         status = kldload(name);
 164         return status == -1 ? status : 0;
 165 }