sys_time.h File Reference

BSD style timeval macros. More...

#include <sys/time.h>

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Macros
#define	timerclear(a)   ((a)->tv_sec = (a)->tv_usec = 0)
#define	timerisset(a)   ((a)->tv_sec || (a)->tv_usec)
#define	timeradd(a, aa, result)
#define	timersub(a, aa, result)
#define	timercmp(a, aa, cmp)

Detailed Description

BSD style timeval macros.

BSD added macros for manipulating timeval which have become standard on modern c libraries but for compatability where they are missing it is necessary to provide fallbacks.

Definition in file sys_time.h.

Macro Definition Documentation

timeradd

#define timeradd	(		a,
			aa,
			result
	)

Value:

        do {                                                            \
                (result)->tv_sec = (a)->tv_sec + (aa)->tv_sec;          \
                (result)->tv_usec = (a)->tv_usec + (aa)->tv_usec;       \
                if ((result)->tv_usec >= 1000000) {                     \
                        ++(result)->tv_sec;                             \
                        (result)->tv_usec -= 1000000;                   \
                }                                                       \
        } while (0)

Definition at line 42 of file sys_time.h.

timerclear

#define timerclear

(

a

)

((a)->tv_sec = (a)->tv_usec = 0)

Definition at line 34 of file sys_time.h.

timercmp

#define timercmp	(		a,
			aa,
			cmp
	)

Value:

        (((a)->tv_sec cmp (aa)->tv_sec) ||                              \
         ((a)->tv_sec == (aa)->tv_sec && (a)->tv_usec cmp (aa)->tv_usec))

Definition at line 66 of file sys_time.h.

timerisset

#define timerisset

(

a

)

((a)->tv_sec || (a)->tv_usec)

Definition at line 38 of file sys_time.h.

timersub

#define timersub	(		a,
			aa,
			result
	)

Value:

        do {                                                            \
                (result)->tv_sec = (a)->tv_sec - (aa)->tv_sec;          \
                (result)->tv_usec = (a)->tv_usec - (aa)->tv_usec;       \
                if ((result)->tv_usec < 0) {                            \
                        --(result)->tv_sec;                             \
                        (result)->tv_usec += 1000000;                   \
                }                                                       \
        } while (0)

Definition at line 54 of file sys_time.h.