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50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
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* Copyright (c) 1996 W. Richard Stevens. All rights reserved.
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* Permission to use or modify this software and its documentation only for
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* educational purposes and without fee is hereby granted, provided that
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* the above copyright notice appear in all copies. The author makes no
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* representations about the suitability of this software for any purpose.
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* It is provided "as is" without express or implied warranty.
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*/
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#include "cliserv.h"
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#include <sys/time.h>
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void tvsub(struct timeval *, struct timeval *);
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struct timeval tvstart, tvend;
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void
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start_timer()
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{
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if (gettimeofday(&tvstart, NULL) < 0)
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err_sys("start_timer: gettimeofday error");
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}
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double
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print_timer()
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{
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double triptime;
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if (gettimeofday(&tvend, NULL) < 0)
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err_sys("print_timer: gettimeofday error");
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tvsub(&tvend, &tvstart);
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triptime = ((double) tvend.tv_sec) * 1000.0 +
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((double) tvend.tv_usec) / 1000.0; /* in millisec */
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printf("rtt = %9.3f ms\n", triptime);
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return(triptime);
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}
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/* Subtract two timeval structures: *end -= *start */
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void
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tvsub(struct timeval *end, struct timeval *start)
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{
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if ((end->tv_usec -= start->tv_usec) < 0) {
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--end->tv_sec;
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end->tv_usec += 1000000;
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}
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end->tv_sec -= start->tv_sec;
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}
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