src/common/align.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #ifndef _UST_COMMON_ALIGN_H
   8 #define _UST_COMMON_ALIGN_H
   9
  10 #include <unistd.h>
  11 #include <limits.h>
  12
  13 #ifdef __FreeBSD__
  14 #include <machine/param.h>
  15 #endif
  16
  17 #ifdef _SC_PAGE_SIZE
  18 #define LTTNG_UST_PAGE_SIZE     sysconf(_SC_PAGE_SIZE)
  19 #elif defined(PAGE_SIZE)
  20 #define LTTNG_UST_PAGE_SIZE     PAGE_SIZE
  21 #else
  22 #error "Please add page size detection for your OS."
  23 #endif
  24
  25 #define LTTNG_UST_PAGE_MASK     (~(LTTNG_UST_PAGE_SIZE - 1))
  26
  27 #define __LTTNG_UST_ALIGN_MASK(v, mask) (((v) + (mask)) & ~(mask))
  28 #define LTTNG_UST_ALIGN(v, align)       __LTTNG_UST_ALIGN_MASK(v, (__typeof__(v)) (align) - 1)
  29 #define LTTNG_UST_PAGE_ALIGN(addr)      LTTNG_UST_ALIGN(addr, LTTNG_UST_PAGE_SIZE)
  30
  31 #endif /* _UST_COMMON_ALIGN_H */