time.h
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上传日期:2007-04-14
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- /* @(#)time.h 2.12 91/05/22 SMI; from UCB 7.1 6/4/86 */
- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- */
- #ifndef _SYS_TIME_H_
- #define _SYS_TIME_H_
- #include <sys/cdefs.h>
- /*
- * Structure returned by gettimeofday(2) system call,
- * and used in other calls.
- */
- struct timeval {
- long tv_sec; /* seconds */
- long tv_usec; /* and microseconds */
- };
- struct timezone {
- int tz_minuteswest; /* minutes west of Greenwich */
- int tz_dsttime; /* type of dst correction */
- };
- #define DST_NONE 0 /* not on dst */
- #define DST_USA 1 /* USA style dst */
- #define DST_AUST 2 /* Australian style dst */
- #define DST_WET 3 /* Western European dst */
- #define DST_MET 4 /* Middle European dst */
- #define DST_EET 5 /* Eastern European dst */
- #define DST_CAN 6 /* Canada */
- #define DST_GB 7 /* Great Britain and Eire */
- #define DST_RUM 8 /* Rumania */
- #define DST_TUR 9 /* Turkey */
- #define DST_AUSTALT 10 /* Australian style with shift in 1986 */
- /*
- * Operations on timevals.
- *
- * NB: timercmp does not work for >= or <=.
- */
- #define timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
- #define timercmp(tvp, uvp, cmp)
- ((tvp)->tv_sec cmp (uvp)->tv_sec ||
- (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
- #define timerclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
- /*
- * Names of the interval timers, and structure
- * defining a timer setting.
- */
- #define ITIMER_REAL 0
- #define ITIMER_VIRTUAL 1
- #define ITIMER_PROF 2
- struct itimerval {
- struct timeval it_interval; /* timer interval */
- struct timeval it_value; /* current value */
- };
- __BEGIN_DECLS
- int gettimeofday __P_((struct timeval *, struct timezone *));
- __END_DECLS
- #endif