libc/sys/chmod.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <sys/stat.h>
  21 #include <stdio.h>
  22 #include <errno.h>
  23 #include <vfs.h>
  24
  25 static vfs_ent_t *getent (const char *path)
  26 {
  27         vfs_ent_t *d = (vfs_ent_t *) 0;
  28
  29         asm volatile (
  30                 "movl $25, %%eax;"
  31                 "movl %1, %%ebx;"
  32                 "int $0x80;"
  33                 "movl %%eax, %0;"
  34                 : "=g" (d) : "b" (path) : "%eax");
  35
  36         return d;
  37 }
  38
  39 int chmod (const char *path, mode_t mode)
  40 {
  41         if (!path) {
  42                 errno = EFAULT;
  43                 return -1;
  44         }
  45
  46         vfs_ent_t *ent = getent (path);
  47
  48         if (!ent) {
  49                 errno = ENOENT;
  50                 return -1;
  51         }
  52
  53         if (mode & S_IRUSR)
  54                 ent->attrib |= VFS_FILEATTR_READ;
  55         else
  56                 ent->attrib &= ~VFS_FILEATTR_READ;
  57
  58         if (mode & S_IXUSR)
  59                 ent->attrib |= VFS_FILEATTR_BIN;
  60         else
  61                 ent->attrib &= ~VFS_FILEATTR_BIN;
  62
  63         /* TODO: more attributes */
  64
  65         return 0;
  66 }
  67
  68