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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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* Definitions for RTT timing.
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*/
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#include "systype.h"
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#include <stdio.h>
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#ifdef BSD
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#include <sys/time.h>
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#include <sys/resource.h>
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#endif
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#ifdef SYS5
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#include <sys/times.h> /* requires <sys/types.h> */
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#include <sys/param.h> /* need the definition of HZ */
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#define TICKS HZ /* see times(2); usually 60 or 100 */
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#endif
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/*
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* Structure to contain everything needed for RTT timing.
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* One of these required per socket being timed.
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* The caller allocates this structure, then passes its address to
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* all the rtt_XXX() functions.
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*/
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struct rtt_struct {
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float rtt_rtt; /* most recent round-trip time (RTT), seconds */
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float rtt_srtt; /* smoothed round-trip time (SRTT), seconds */
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float rtt_rttdev; /* smoothed mean deviation, seconds */
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short rtt_nrexmt; /* #times retransmitted: 0, 1, 2, ... */
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short rtt_currto; /* current retransmit timeout (RTO), seconds */
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short rtt_nxtrto; /* retransmit timeout for next packet, if nonzero */
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#ifdef BSD
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struct timeval time_start; /* for elapsed time */
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struct timeval time_stop; /* for elapsed time */
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#endif
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#ifdef SYS5
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long time_start; /* for elapsed time */
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long time_stop; /* for elapsed time */
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struct tms tms_start; /* arg to times(2), but not used */
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struct tms tms_stop; /* arg to times(2), but not used */
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#endif
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};
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#define RTT_RXTMIN 2 /* min retransmit timeout value, seconds */
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#define RTT_RXTMAX 120 /* max retransmit timeout value, seconds */
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#define RTT_MAXNREXMT 4 /* max #times to retransmit: must also
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change exp_backoff[] if this changes */
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#ifdef SYS5
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long times(); /* the system call */
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#endif
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extern int rtt_d_flag; /* can be set nonzero by caller for addl info */
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