nfstnew.c

这是用C编写IMAP源代码

/*
 * Program:	Test for NFS file
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: [e-mail]
 *
 * Date:	10 April 2001
 * Last Edited:	12 April 2001
 * 
 * The IMAP toolkit provided in this Distribution is
 * Copyright 2001 University of Washington.
 * The full text of our legal notices is contained in the file called
 * CPYRIGHT, included with this Distribution.
 */

#include <sys/statvfs.h>

/* Test for NFS
 * Accepts: file descriptor
 * Returns: T if NFS file, NIL otherwise
 */

long test_nfs (int fd)
{
  struct stat sbuf;
  struct ustat usbuf;
  struct statvfs vsbuf;
  /* Any base type that begins with "nfs" or "afs" is considered to be a
   * network filesystem.
   */
  return ((!fstat (fd,&sbuf) && !ustat (sbuf.st_dev,&usbuf) &&
	   !++usbuf.f_tinode) ||
	  (!fstatvfs (fd,&vsbuf) && (vsbuf.f_basetype[1] == 'f') &&
	   (vsbuf.f_basetype[2] == 's') &&
	   ((vsbuf.f_basetype[0] == 'n') || (vsbuf.f_basetype[0] == 'a')))) ?
	     LONGT : NIL;
}