sys_time.mh

来自「开放源码的编译器open watcom 1.6.0版的源代码」· MH 代码 · 共 107 行

/*
 *  sys/time.h      Time functions
 *
:include crwat.sp
 */
#ifndef _SYS_TIME_H_INCLUDED
#define _SYS_TIME_H_INCLUDED
#include <time.h>
:include readonly.sp
:include cpluspro.sp
:include lnxkpack.sp

/* I am not sure where this should go, so I am putting it here for now.
 * It should probably exist in a separate header file like sys/select.h
 * but it is not clear to me exactly where yet. KB.
 */

/* The fd_set member is required to be an array of longs.  */
typedef long fd_mask;

#define FD_SETSIZE          1024
#define __NFDBITS           (8 * sizeof (fd_mask))
#define __FDELT(d)          ((d) / __NFDBITS)
#define __FDMASK(d)         ((fd_mask) 1 << ((d) % __NFDBITS))
#define __FDS_BITS(set) ((set)->fds_bits)

/* fd_set for select */
typedef struct {
    fd_mask fds_bits[FD_SETSIZE / __NFDBITS];
} fd_set;

/* We don't use `memset' because this would require a prototype and
 * the array isn't too big.
 */
# define FD_ZERO(set)                                                       \
    do {                                                                                                        \
        unsigned int __i;                                                                               \
        fd_set *__arr = (set);                                                                  \
        for (__i = 0; __i < sizeof (fd_set) / sizeof (fd_mask); ++__i)      \
            __FDS_BITS (__arr)[__i] = 0;                                                        \
    } while (0)
#define FD_SET(d, set)      (__FDS_BITS (set)[__FDELT (d)] |= __FDMASK (d))
#define FD_CLR(d, set)      (__FDS_BITS (set)[__FDELT (d)] &= ~__FDMASK (d))
#define FD_ISSET(d, set)    (__FDS_BITS (set)[__FDELT (d)] & __FDMASK (d))

/*
 * Structure returned by gettimeofday() 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       /* Romania */
#define DST_TUR         9       /* Turkey */
#define DST_AUSTALT     10      /* Australian style with shift in 1986 */

/*
 * Structure used by getitimer() and setitimer() system calls.
 */
struct itimerval {
    struct timeval it_interval; /* Value to put into `it_value' when the timer expires. */
    struct timeval it_value;    /* Time to the next timer expiration. */
};

#define ITIMER_REAL     0       /* Timers run in real time. */
#define ITIMER_VIRTUAL  1       /* Timers run only when the process is executing. */
#define ITIMER_PROF     2       /* Process or kernel on its behalf is executing. */

/*
 * 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 == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec) \
        || (tvp)->tv_sec cmp (uvp)->tv_sec)
#define timerclear(tvp)         ((tvp)->tv_sec = (tvp)->tv_usec = 0)

_WCRTLINK extern int gettimeofday( struct timeval *__tv, struct timezone *__tz );
_WCRTLINK extern int settimeofday( const struct timeval *__tv, const struct timezone *__tz );
_WCRTLINK extern int select( int __width, fd_set *__readfds, fd_set *__writefds, fd_set *__exceptfds, struct timeval *__timeout );
_WCRTLINK extern int getitimer( int __which, struct itimerval *__value );
_WCRTLINK extern int setitimer( int __which, const struct itimerval *__value, struct itimerval *__ovalue );
//_WCRTLINK extern int adjtime( struct timeval *__itv, struct timeval *__otv );
//_WCRTLINK extern int utimes( char *__path, struct timeval *tvp );

:include poppack.sp
:include cplusepi.sp
#endif /* !_SYS_TIME_H_INCLUDED */