lib/libspl/include/sys/trace_zfs.h

   1 /* Here to keep the libspl build happy */
   2
   3 #ifndef _LIBSPL_ZFS_TRACE_H
   4 #define _LIBSPL_ZFS_TRACE_H
   5
   6 /*
   7  * The set-error SDT probe is extra static, in that we declare its fake
   8  * function literally, rather than with the DTRACE_PROBE1() macro.  This is
   9  * necessary so that SET_ERROR() can evaluate to a value, which wouldn't
  10  * be possible if it required multiple statements (to declare the function
  11  * and then call it).
  12  *
  13  * SET_ERROR() uses the comma operator so that it can be used without much
  14  * additional code.  For example, "return (EINVAL);" becomes
  15  * "return (SET_ERROR(EINVAL));".  Note that the argument will be evaluated
  16  * twice, so it should not have side effects (e.g. something like:
  17  * "return (SET_ERROR(log_error(EINVAL, info)));" would log the error twice).
  18  */
  19 #undef SET_ERROR
  20 #define SET_ERROR(err) \
  21         (__set_error(__FILE__, __func__, __LINE__, err), err)
  22
  23
  24 #endif