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root/kernel/syscalls/utime.c

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DEFINITIONS

This source file includes following definitions.
  1. sys_utime

   1 /*
   2  * fiwix/kernel/syscalls/utime.c
   3  *
   4  * Copyright 2018, Jordi Sanfeliu. All rights reserved.
   5  * Distributed under the terms of the Fiwix License.
   6  */
   7 
   8 #include <fiwix/kernel.h>
   9 #include <fiwix/fs.h>
  10 #include <fiwix/utime.h>
  11 #include <fiwix/stat.h>
  12 #include <fiwix/errno.h>
  13 #include <fiwix/string.h>
  14 
  15 #ifdef __DEBUG__
  16 #include <fiwix/stdio.h>
  17 #include <fiwix/process.h>
  18 #endif /*__DEBUG__ */
  19 
  20 int sys_utime(const char *filename, struct utimbuf *times)
  21 {
  22         struct inode *i;
  23         char *tmp_name;
  24         int errno;
  25 
  26 #ifdef __DEBUG__
  27         printk("(pid %d) sys_utime('%s', 0x%08x)\n", current->pid, filename, (int)times);
  28 #endif /*__DEBUG__ */
  29 
  30         if((errno = malloc_name(filename, &tmp_name)) < 0) {
  31                 return errno;
  32         }
  33         if((errno = namei(tmp_name, &i, NULL, FOLLOW_LINKS))) {
  34                 free_name(tmp_name);
  35                 return errno;
  36         }
  37 
  38         if(IS_RDONLY_FS(i)) {
  39                 iput(i);
  40                 free_name(tmp_name);
  41                 return -EROFS;
  42         }
  43 
  44         if(!times) {
  45                 if(check_user_permission(i) || check_permission(TO_WRITE, i)) {
  46                         iput(i);
  47                         free_name(tmp_name);
  48                         return -EACCES;
  49                 }
  50                 i->i_atime = CURRENT_TIME;
  51                 i->i_mtime = CURRENT_TIME;
  52         } else {
  53                 if((errno = check_user_area(VERIFY_READ, times, sizeof(struct utimbuf)))) {
  54                         iput(i);
  55                         free_name(tmp_name);
  56                         return errno;
  57                 }
  58                 if(check_user_permission(i)) {
  59                         iput(i);
  60                         free_name(tmp_name);
  61                         return -EPERM;
  62                 }
  63                 i->i_atime = times->actime;
  64                 i->i_mtime = times->modtime;
  65         }
  66 
  67         i->i_ctime = CURRENT_TIME;
  68         i->dirty = 1;
  69         iput(i);
  70         free_name(tmp_name);
  71         return 0;
  72 }

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