src/lib/wallclock/timeval.h

   1 /* Copyright (c) 2003-2004, Roger Dingledine
   2  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
   3  * Copyright (c) 2007-2021, The Tor Project, Inc. */
   4 /* See LICENSE for licensing information */
   5
   6 /**
   7  * \file timeval.h
   8  *
   9  * \brief Declarations for timeval-related macros that some platforms
  10  * are missing.
  11  **/
  12
  13 #ifndef TOR_TIMEVAL_H
  14 #define TOR_TIMEVAL_H
  15
  16 #include "orconfig.h"
  17 #include "lib/cc/torint.h"
  18
  19 #ifdef HAVE_SYS_TIME_H
  20 #include <sys/time.h>
  21 #endif
  22
  23 #ifdef TOR_COVERAGE
  24 /* For coverage builds, we use a slower definition of these macros without
  25  * branches, to make coverage consistent. */
  26 #undef timeradd
  27 #undef timersub
  28 #define timeradd(tv1,tv2,tvout) \
  29   do {                          \
  30     (tvout)->tv_sec = (tv1)->tv_sec + (tv2)->tv_sec;    \
  31     (tvout)->tv_usec = (tv1)->tv_usec + (tv2)->tv_usec; \
  32     (tvout)->tv_sec += (tvout)->tv_usec / 1000000;      \
  33     (tvout)->tv_usec %= 1000000;                        \
  34   } while (0)
  35 #define timersub(tv1,tv2,tvout) \
  36   do {                          \
  37     (tvout)->tv_sec = (tv1)->tv_sec - (tv2)->tv_sec - 1;            \
  38     (tvout)->tv_usec = (tv1)->tv_usec - (tv2)->tv_usec + 1000000;   \
  39     (tvout)->tv_sec += (tvout)->tv_usec / 1000000;                  \
  40     (tvout)->tv_usec %= 1000000;                                    \
  41   } while (0)
  42 #endif /* defined(TOR_COVERAGE) */
  43
  44 #ifndef timeradd
  45 /** Replacement for timeradd on platforms that do not have it: sets tvout to
  46  * the sum of tv1 and tv2. */
  47 #define timeradd(tv1,tv2,tvout) \
  48   do {                                                  \
  49     (tvout)->tv_sec = (tv1)->tv_sec + (tv2)->tv_sec;    \
  50     (tvout)->tv_usec = (tv1)->tv_usec + (tv2)->tv_usec; \
  51     if ((tvout)->tv_usec >= 1000000) {                  \
  52       (tvout)->tv_usec -= 1000000;                      \
  53       (tvout)->tv_sec++;                                \
  54     }                                                   \
  55   } while (0)
  56 #endif /* !defined(timeradd) */
  57
  58 #ifndef timersub
  59 /** Replacement for timersub on platforms that do not have it: sets tvout to
  60  * tv1 minus tv2. */
  61 #define timersub(tv1,tv2,tvout) \
  62   do {                                                  \
  63     (tvout)->tv_sec = (tv1)->tv_sec - (tv2)->tv_sec;    \
  64     (tvout)->tv_usec = (tv1)->tv_usec - (tv2)->tv_usec; \
  65     if ((tvout)->tv_usec < 0) {                         \
  66       (tvout)->tv_usec += 1000000;                      \
  67       (tvout)->tv_sec--;                                \
  68     }                                                   \
  69   } while (0)
  70 #endif /* !defined(timersub) */
  71
  72 #ifndef COCCI
  73 #ifndef timercmp
  74 /** Replacement for timercmp on platforms that do not have it: returns true
  75  * iff the relational operator "op" makes the expression tv1 op tv2 true.
  76  *
  77  * Note that while this definition should work for all boolean operators, some
  78  * platforms' native timercmp definitions do not support >=, <=, or ==.  So
  79  * don't use those.
  80  */
  81 #define timercmp(tv1,tv2,op)                    \
  82   (((tv1)->tv_sec == (tv2)->tv_sec) ?           \
  83    ((tv1)->tv_usec op (tv2)->tv_usec) :         \
  84    ((tv1)->tv_sec op (tv2)->tv_sec))
  85 #endif /* !defined(timercmp) */
  86 #endif /* !defined(COCCI) */
  87
  88 #endif /* !defined(TOR_TIMEVAL_H) */