78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* Copyright 2002-2012 Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _SYS_TIME_H
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#define _SYS_TIME_H
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#include <sys/types.h>
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struct timeval {
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time_t tv_sec; /* seconds */
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suseconds_t tv_usec; /* microseconds */
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};
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#include <sys/select.h>
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/* circular dependency: fd_set needs to be defined and the
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* select prototype exported by this file, but <sys/select.h>
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* needs struct timeval.
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*/
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struct timezone {
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int tz_minuteswest;
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int tz_dsttime;
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};
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struct itimerval {
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struct timeval it_interval;
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struct timeval it_value;
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};
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#define ITIMER_REAL 1 /* real time */
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#define ITIMER_VIRTUAL 2 /* process virtual time */
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#define ITIMER_PROF 3 /* both */
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern int getitimer(int which, struct itimerval *value);
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extern int setitimer(int which, const struct itimerval *value, struct itimerval *oldValue);
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extern int gettimeofday(struct timeval *tv, void *tz);
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extern int utimes(const char *path, const struct timeval times[2]);
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/* legacy */
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#ifdef __cplusplus
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}
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#endif
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/* BSDish macros operating on timeval structs */
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#define timeradd(a, b, res) \
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do { \
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(res)->tv_sec = (a)->tv_sec + (b)->tv_sec; \
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(res)->tv_usec = (a)->tv_usec + (b)->tv_usec; \
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if ((res)->tv_usec >= 1000000) { \
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(res)->tv_usec -= 1000000; \
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(res)->tv_sec++; \
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} \
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} while (0)
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#define timersub(a, b, res) \
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do { \
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(res)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
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(res)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
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if ((res)->tv_usec < 0) { \
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(res)->tv_usec += 1000000; \
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(res)->tv_sec--; \
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} \
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} while (0)
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#define timerclear(a) ((a)->tv_sec = (a)->tv_usec = 0)
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#define timerisset(a) ((a)->tv_sec != 0 || (a)->tv_usec != 0)
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#define timercmp(a, b, cmp) ((a)->tv_sec == (b)->tv_sec \
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? (a)->tv_usec cmp (b)->tv_usec : (a)->tv_sec cmp (b)->tv_sec)
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#endif /* _SYS_TIME_H */
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