root/kernel/syscalls/close.c

/* */

DEFINITIONS

1. sys_close

   1 /*
   2  * fiwix/kernel/syscalls/close.c
   3  *
   4  * Copyright 2018, Jordi Sanfeliu. All rights reserved.
   5  * Distributed under the terms of the Fiwix License.
   6  */
   7 
   8 #include <fiwix/syscalls.h>
   9 #include <fiwix/locks.h>
  10 #include <fiwix/errno.h>
  11 #include <fiwix/stdio.h>
  12 
  13 int sys_close(unsigned int ufd)
  14 {
  15         unsigned int fd;
  16         struct inode *i;
  17 
  18 #ifdef __DEBUG__
  19         printk("(pid %d) sys_close(%d)\n", current->pid, ufd);
  20 #endif /*__DEBUG__ */
  21 
  22         CHECK_UFD(ufd);
  23         fd = current->fd[ufd];
  24         release_user_fd(ufd);
  25 
  26         if(--fd_table[fd].count) {
  27                 return 0;
  28         }
  29         i = fd_table[fd].inode;
  30         flock_release_inode(i);
  31         if(i->fsop && i->fsop->close) {
  32                 i->fsop->close(i, &fd_table[fd]);
  33                 release_fd(fd);
  34                 iput(i);
  35                 return 0;
  36         }
  37         printk("WARNING: %s(): ufd %d without the close() method!\n", __FUNCTION__, ufd);
  38         return -EINVAL;
  39 }

/* */