74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
#ifndef _LINUX_TIME_H
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#define _LINUX_TIME_H
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#include <asm/param.h>
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#include <sys/types.h>
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#ifndef _STRUCT_TIMESPEC
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#define _STRUCT_TIMESPEC
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struct timespec {
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time_t tv_sec; /* seconds */
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long tv_nsec; /* nanoseconds */
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};
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#endif /* _STRUCT_TIMESPEC */
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/*
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* Change timeval to jiffies, trying to avoid the
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* most obvious overflows..
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*
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* And some not so obvious.
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*
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* Note that we don't want to return MAX_LONG, because
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* for various timeout reasons we often end up having
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* to wait "jiffies+1" in order to guarantee that we wait
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* at _least_ "jiffies" - so "jiffies+1" had better still
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* be positive.
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*/
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#define MAX_JIFFY_OFFSET ((~0UL >> 1)-1)
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static __inline__ unsigned long
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timespec_to_jiffies(struct timespec *value)
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{
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unsigned long sec = value->tv_sec;
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long nsec = value->tv_nsec;
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if (sec >= (MAX_JIFFY_OFFSET / HZ))
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return MAX_JIFFY_OFFSET;
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nsec += 1000000000L / HZ - 1;
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nsec /= 1000000000L / HZ;
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return HZ * sec + nsec;
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}
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static __inline__ void
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jiffies_to_timespec(unsigned long jiffies, struct timespec *value)
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{
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value->tv_nsec = (jiffies % HZ) * (1000000000L / HZ);
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value->tv_sec = jiffies / HZ;
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}
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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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struct timezone {
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int tz_minuteswest; /* minutes west of Greenwich */
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int tz_dsttime; /* type of dst correction */
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};
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#define ITIMER_REAL 0
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#define ITIMER_VIRTUAL 1
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#define ITIMER_PROF 2
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struct itimerspec {
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struct timespec it_interval; /* timer period */
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struct timespec it_value; /* timer expiration */
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};
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struct itimerval {
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struct timeval it_interval; /* timer interval */
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struct timeval it_value; /* current value */
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};
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#endif
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