61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
/*
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* Copyright (c) 201 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* sys/times/times.c
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* Get process execution time statistics.
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*/
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#include <sys/times.h>
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#include <stdint.h>
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#include <time.h>
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#include <unistd.h>
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// TODO: It is a bit needless to use 64-bit integers on 32-bit platforms and the
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// division is probably very inefficient. In addition, this implementation
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// doesn't hanndle a full 64-bit clock_t, however it won't cause problems
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// before a lot of years has passed, which is unlikely to happen, and the
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// clock function probably shouldn't be used in programs with that long
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// running times.
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// TODO: Does this function overflow correctly?
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clock_t timespec_to_clock(struct timespec t)
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{
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uint64_t ticks_per_second = (uint64_t) sysconf(_SC_CLK_TCK);
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uint64_t sec_contrib = (uint64_t) t.tv_sec * ticks_per_second;
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uint64_t nsec_contrib = (uint64_t) t.tv_nsec * ticks_per_second;
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return (clock_t) (sec_contrib + nsec_contrib / 1000000000);
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}
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// TODO: This function is crap and has been replaced by timens or clock_gettime.
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clock_t times(struct tms* buf)
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{
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if ( buf )
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{
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struct tmns tmns;
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if ( timens(&tmns) < 0 )
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return (clock_t) -1;
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buf->tms_utime = timespec_to_clock(tmns.tmns_utime);
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buf->tms_stime = timespec_to_clock(tmns.tmns_stime);
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buf->tms_cutime = timespec_to_clock(tmns.tmns_cutime);
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buf->tms_cstime = timespec_to_clock(tmns.tmns_cstime);
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}
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// TODO: Should this be CLOCK_REALTIME instead?
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struct timespec now;
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if ( clock_gettime(CLOCK_MONOTONIC, &now) < 0 )
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return -1;
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return timespec_to_clock(now);
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}
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