| 1 | #ifndef _LINUX_TIME_H
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| 2 | #define _LINUX_TIME_H
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| 3 |
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| 4 | #include <asm/param.h>
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| 5 | #include <linux/types.h>
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| 6 |
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| 7 | #ifndef _STRUCT_TIMESPEC
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| 8 | #define _STRUCT_TIMESPEC
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| 9 | struct timespec {
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| 10 | time_t tv_sec; /* seconds */
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| 11 | long tv_nsec; /* nanoseconds */
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| 12 | };
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| 13 | #endif /* _STRUCT_TIMESPEC */
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| 14 |
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| 15 | /*
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| 16 | * Change timeval to jiffies, trying to avoid the
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| 17 | * most obvious overflows..
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| 18 | *
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| 19 | * And some not so obvious.
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| 20 | *
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| 21 | * Note that we don't want to return MAX_LONG, because
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| 22 | * for various timeout reasons we often end up having
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| 23 | * to wait "jiffies+1" in order to guarantee that we wait
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| 24 | * at _least_ "jiffies" - so "jiffies+1" had better still
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| 25 | * be positive.
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| 26 | */
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| 27 | #define MAX_JIFFY_OFFSET ((~0UL >> 1)-1)
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| 28 |
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| 29 | static __inline__ unsigned long
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| 30 | timespec_to_jiffies(struct timespec *value)
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| 31 | {
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| 32 | unsigned long sec = value->tv_sec;
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| 33 | long nsec = value->tv_nsec;
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| 34 |
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| 35 | if (sec >= (MAX_JIFFY_OFFSET / HZ))
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| 36 | return MAX_JIFFY_OFFSET;
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| 37 | nsec += 1000000000L / HZ - 1;
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| 38 | nsec /= 1000000000L / HZ;
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| 39 | return HZ * sec + nsec;
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| 40 | }
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| 41 |
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| 42 | static __inline__ void
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| 43 | jiffies_to_timespec(unsigned long jiffies, struct timespec *value)
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| 44 | {
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| 45 | value->tv_nsec = (jiffies % HZ) * (1000000000L / HZ);
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| 46 | value->tv_sec = jiffies / HZ;
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| 47 | }
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| 48 |
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| 49 | struct timeval {
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| 50 | time_t tv_sec; /* seconds */
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| 51 | suseconds_t tv_usec; /* microseconds */
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| 52 | };
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| 53 |
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| 54 | struct timezone {
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| 55 | int tz_minuteswest; /* minutes west of Greenwich */
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| 56 | int tz_dsttime; /* type of dst correction */
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| 57 | };
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| 58 |
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| 59 | #define NFDBITS __NFDBITS
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| 60 |
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| 61 | #ifdef __KERNEL__
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| 62 | extern void do_gettimeofday(struct timeval *tv);
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| 63 | extern void do_settimeofday(struct timeval *tv);
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| 64 | extern void get_fast_time(struct timeval *tv);
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| 65 | extern void (*do_get_fast_time)(struct timeval *);
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| 66 | #endif
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| 67 |
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| 68 | #define FD_SETSIZE __FD_SETSIZE
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| 69 | #define FD_SET(fd,fdsetp) __FD_SET(fd,fdsetp)
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| 70 | #define FD_CLR(fd,fdsetp) __FD_CLR(fd,fdsetp)
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| 71 | #define FD_ISSET(fd,fdsetp) __FD_ISSET(fd,fdsetp)
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| 72 | #define FD_ZERO(fdsetp) __FD_ZERO(fdsetp)
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| 73 |
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| 74 | /*
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| 75 | * Names of the interval timers, and structure
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| 76 | * defining a timer setting.
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| 77 | */
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| 78 | #define ITIMER_REAL 0
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| 79 | #define ITIMER_VIRTUAL 1
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| 80 | #define ITIMER_PROF 2
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| 81 |
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| 82 | struct itimerspec {
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| 83 | struct timespec it_interval; /* timer period */
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| 84 | struct timespec it_value; /* timer expiration */
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| 85 | };
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| 86 |
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| 87 | struct itimerval {
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| 88 | struct timeval it_interval; /* timer interval */
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| 89 | struct timeval it_value; /* current value */
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| 90 | };
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| 91 |
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| 92 | /* msecs_to_jiffies */
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| 93 | #ifndef CONFIG_HAVE_MSECS_TO_JIFFIES
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| 94 | static __inline__ unsigned int jiffies_to_msecs(const unsigned long j)
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| 95 | {
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| 96 | if (HZ <= 1000 && !(1000 % HZ))
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| 97 | return (1000 / HZ) * j;
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| 98 | else if (HZ > 1000 && !(HZ % 1000))
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| 99 | return (j + (HZ / 1000) - 1)/(HZ / 1000);
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| 100 | else
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| 101 | return (j * 1000) / HZ;
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| 102 | }
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| 103 | static __inline__ unsigned long msecs_to_jiffies(const unsigned int m)
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| 104 | {
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| 105 | if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
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| 106 | return MAX_JIFFY_OFFSET;
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| 107 | if (HZ <= 1000 && !(1000 % HZ))
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| 108 | return (m + (1000 / HZ) - 1) / (1000 / HZ);
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| 109 | else if (HZ > 1000 && !(HZ % 1000))
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| 110 | return m * (HZ / 1000);
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| 111 | else
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| 112 | return (m * HZ + 999) / 1000;
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| 113 | }
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| 114 | #endif
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| 115 |
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| 116 | #endif
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