root/kernel/syscalls/getdents.c

/* */

DEFINITIONS

1. sys_getdents

   1 /*
   2  * fiwix/kernel/syscalls/getdents.c
   3  *
   4  * Copyright 2018, Jordi Sanfeliu. All rights reserved.
   5  * Distributed under the terms of the Fiwix License.
   6  */
   7 
   8 #include <fiwix/fs.h>
   9 #include <fiwix/dirent.h>
  10 #include <fiwix/process.h>
  11 #include <fiwix/stat.h>
  12 #include <fiwix/errno.h>
  13 
  14 #ifdef __DEBUG__
  15 #include <fiwix/stdio.h>
  16 #endif /*__DEBUG__ */
  17 
  18 int sys_getdents(unsigned int ufd, struct dirent *dirent, unsigned int count)
  19 {
  20         struct inode *i;
  21         int errno;
  22 
  23 #ifdef __DEBUG__
  24         printk("(pid %d) sys_getdents(%d, 0x%08x, %d)", current->pid, ufd, (unsigned int)dirent, count);
  25 #endif /*__DEBUG__ */
  26 
  27         CHECK_UFD(ufd);
  28         if((errno = check_user_area(VERIFY_WRITE, dirent, sizeof(struct dirent)))) {
  29                 return errno;
  30         }
  31         i = fd_table[current->fd[ufd]].inode;
  32 
  33         if(!S_ISDIR(i->i_mode)) {
  34                 return -ENOTDIR;
  35         }
  36 
  37         if(i->fsop && i->fsop->readdir) {
  38                 errno = i->fsop->readdir(i, &fd_table[current->fd[ufd]], dirent, count);
  39         #ifdef __DEBUG__
  40                 printk(" -> returning %d\n", errno);
  41         #endif /*__DEBUG__ */
  42                 return errno;
  43         }
  44         return -EINVAL;
  45 }

/* */