2011-02-12 05:22:29 +00:00
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#ifndef _TIME_H
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#define _TIME_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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2012-09-08 03:13:55 +00:00
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#include <features.h>
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2012-09-07 02:44:55 +00:00
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use a common definition of NULL as 0L for C and C++
the historical mess of having different definitions for C and C++
comes from the historical C definition as (void *)0 and the fact that
(void *)0 can't be used in C++ because it does not convert to other
pointer types implicitly. however, using plain 0 in C++ exposed bugs
in C++ programs that call variadic functions with NULL as an argument
and (wrongly; this is UB) expect it to arrive as a null pointer. on
64-bit machines, the high bits end up containing junk. glibc dodges
the issue by using a GCC extension __null to define NULL; this is
observably non-conforming because a conforming application could
observe the definition of NULL via stringizing and see that it is
neither an integer constant expression with value zero nor such an
expression cast to void.
switching to 0L eliminates the issue and provides compatibility with
broken applications, since on all musl targets, long and pointers have
the same size, representation, and argument-passing convention. we
could maintain separate C and C++ definitions of NULL (i.e. just use
0L on C++ and use (void *)0 on C) but after careful analysis, it seems
extremely difficult for a C program to even determine whether NULL has
integer or pointer type, much less depend in subtle, unintentional
ways, on whether it does. C89 seems to have no way to make the
distinction. on C99, the fact that (int)(void *)0 is not an integer
constant expression, along with subtle VLA/sizeof semantics, can be
used to make the distinction, but many compilers are non-conforming
and give the wrong result to this test anyway. on C11, _Generic can
trivially make the distinction, but it seems unlikely that code
targetting C11 would be so backwards in caring which definition of
NULL an implementation uses.
as such, the simplest path of using the same definition for NULL in
both C and C++ was chosen. the #undef directive was also removed so
that the compiler can catch and give a warning or error on
redefinition if buggy programs have defined their own versions of
NULL prior to inclusion of standard headers.
2013-01-19 01:35:26 +00:00
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#define NULL 0L
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2011-02-12 05:22:29 +00:00
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2011-02-15 20:25:31 +00:00
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#define __NEED_size_t
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2011-02-12 05:22:29 +00:00
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#define __NEED_time_t
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#define __NEED_clock_t
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2011-02-15 01:45:37 +00:00
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#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
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2012-05-23 01:52:08 +00:00
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|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
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|| defined(_BSD_SOURCE)
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2011-02-15 01:45:37 +00:00
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#define __NEED_struct_timespec
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2011-02-12 05:22:29 +00:00
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#define __NEED_clockid_t
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#define __NEED_timer_t
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#define __NEED_pid_t
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2012-02-07 02:51:02 +00:00
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#define __NEED_locale_t
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2011-02-15 01:45:37 +00:00
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#endif
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2011-02-12 05:22:29 +00:00
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#include <bits/alltypes.h>
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2013-06-07 13:54:45 +00:00
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#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
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#define __tm_gmtoff tm_gmtoff
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#define __tm_zone tm_zone
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#endif
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2011-02-12 05:22:29 +00:00
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struct tm
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{
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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int tm_wday;
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int tm_yday;
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int tm_isdst;
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long __tm_gmtoff;
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const char *__tm_zone;
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};
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clock_t clock (void);
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time_t time (time_t *);
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double difftime (time_t, time_t);
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time_t mktime (struct tm *);
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2012-09-07 02:44:55 +00:00
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size_t strftime (char *__restrict, size_t, const char *__restrict, const struct tm *__restrict);
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2011-02-12 05:22:29 +00:00
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struct tm *gmtime (const time_t *);
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struct tm *localtime (const time_t *);
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char *asctime (const struct tm *);
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char *ctime (const time_t *);
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2011-02-15 01:45:37 +00:00
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#define CLOCKS_PER_SEC 1000000UL
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2011-02-12 05:22:29 +00:00
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2011-02-15 01:45:37 +00:00
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#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
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2012-05-23 01:52:08 +00:00
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|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
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|| defined(_BSD_SOURCE)
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2011-02-12 05:22:29 +00:00
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2012-09-07 02:44:55 +00:00
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size_t strftime_l (char * __restrict, size_t, const char * __restrict, const struct tm * __restrict, locale_t);
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2012-02-07 02:51:02 +00:00
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2012-09-07 02:44:55 +00:00
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struct tm *gmtime_r (const time_t *__restrict, struct tm *__restrict);
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struct tm *localtime_r (const time_t *__restrict, struct tm *__restrict);
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char *asctime_r (const struct tm *__restrict, char *__restrict);
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2011-02-15 01:45:37 +00:00
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char *ctime_r (const time_t *, char *);
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2011-02-12 05:22:29 +00:00
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2011-02-15 01:45:37 +00:00
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void tzset (void);
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2011-02-12 05:22:29 +00:00
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2011-02-15 01:45:37 +00:00
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struct itimerspec
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{
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struct timespec it_interval;
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struct timespec it_value;
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};
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2011-02-12 05:22:29 +00:00
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2011-02-15 01:45:37 +00:00
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#define CLOCK_REALTIME 0
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#define CLOCK_MONOTONIC 1
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#define CLOCK_PROCESS_CPUTIME_ID 2
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#define CLOCK_THREAD_CPUTIME_ID 3
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#define TIMER_ABSTIME 1
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2011-02-12 05:22:29 +00:00
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2011-02-15 01:45:37 +00:00
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int nanosleep (const struct timespec *, struct timespec *);
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2011-02-12 05:22:29 +00:00
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int clock_getres (clockid_t, struct timespec *);
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int clock_gettime (clockid_t, struct timespec *);
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int clock_settime (clockid_t, const struct timespec *);
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int clock_nanosleep (clockid_t, int, const struct timespec *, struct timespec *);
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int clock_getcpuclockid (pid_t, clockid_t *);
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struct sigevent;
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2012-09-07 02:44:55 +00:00
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int timer_create (clockid_t, struct sigevent *__restrict, timer_t *__restrict);
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2011-02-12 05:22:29 +00:00
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int timer_delete (timer_t);
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2012-09-07 02:44:55 +00:00
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int timer_settime (timer_t, int, const struct itimerspec *__restrict, struct itimerspec *__restrict);
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2011-02-12 05:22:29 +00:00
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int timer_gettime (timer_t, struct itimerspec *);
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int timer_getoverrun (timer_t);
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2011-02-15 01:45:37 +00:00
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#endif
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2011-02-12 05:22:29 +00:00
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2011-02-15 01:45:37 +00:00
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2012-06-13 18:46:11 +00:00
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#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)
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2012-09-07 02:44:55 +00:00
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char *strptime (const char *__restrict, const char *__restrict, struct tm *__restrict);
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2011-02-15 01:45:37 +00:00
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extern int daylight;
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extern long timezone;
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extern char *tzname[2];
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2011-02-12 05:22:29 +00:00
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extern int getdate_err;
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2011-09-14 01:09:35 +00:00
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struct tm *getdate (const char *);
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2011-02-15 01:45:37 +00:00
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#endif
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2011-02-12 05:22:29 +00:00
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2012-06-13 18:43:16 +00:00
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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2012-04-18 16:22:24 +00:00
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int stime(time_t *);
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2012-06-13 18:41:52 +00:00
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time_t timegm(struct tm *);
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#endif
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2012-04-18 16:22:24 +00:00
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2011-02-12 05:22:29 +00:00
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#ifdef __cplusplus
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}
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#endif
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#endif
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