The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/kernel-current-time.m4

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    1 dnl #
    2 dnl # 4.9, current_time() added
    3 dnl # 4.18, return type changed from timespec to timespec64
    4 dnl #
    5 AC_DEFUN([ZFS_AC_KERNEL_SRC_CURRENT_TIME], [
    6         ZFS_LINUX_TEST_SRC([current_time], [
    7                 #include <linux/fs.h>
    8         ], [
    9                 struct inode ip __attribute__ ((unused));
   10                 ip.i_atime = current_time(&ip);
   11         ])
   12 ])
   13 
   14 AC_DEFUN([ZFS_AC_KERNEL_CURRENT_TIME], [
   15         AC_MSG_CHECKING([whether current_time() exists])
   16         ZFS_LINUX_TEST_RESULT_SYMBOL([current_time],
   17             [current_time], [fs/inode.c], [
   18                 AC_MSG_RESULT(yes)
   19                 AC_DEFINE(HAVE_CURRENT_TIME, 1, [current_time() exists])
   20         ], [
   21                 AC_MSG_RESULT(no)
   22         ])
   23 ])

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