d-ino.m4

来自「gnu tar 源码包。 tar 软件是 Unix 系统下的一个打包软件」· M4 代码 · 共 42 行

#serial 10

dnl From Jim Meyering.
dnl
dnl Check whether struct dirent has a member named d_ino.
dnl

# Copyright (C) 1997, 1999, 2000, 2001, 2003, 2004, 2006, 2007 Free Software
# Foundation, Inc.

# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO],
  [AC_CACHE_CHECK([for d_ino member in directory struct],
		  gl_cv_struct_dirent_d_ino,
     [AC_RUN_IFELSE(
	[AC_LANG_PROGRAM(
	   [[#include <sys/types.h>
	     #include <sys/stat.h>
	     #include <dirent.h>
	   ]],
	   [[DIR *dp = opendir (".");
	     struct dirent *e;
	     struct stat st;
	     if (! dp)
	       return 1;
	     e = readdir (dp);
	     return ! (e
		       && stat (e->d_name, &st) == 0
		       && e->d_ino == st.st_ino);]])],
	    [gl_cv_struct_dirent_d_ino=yes],
	    [gl_cv_struct_dirent_d_ino=no],
	    [gl_cv_struct_dirent_d_ino=no])])
   if test $gl_cv_struct_dirent_d_ino = yes; then
     AC_DEFINE(D_INO_IN_DIRENT, 1,
       [Define if struct dirent has a member d_ino that actually works.])
   fi
  ]
)