diff options
Diffstat (limited to 'sbin/ping/ping.c')
| -rw-r--r-- | sbin/ping/ping.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/sbin/ping/ping.c b/sbin/ping/ping.c index 5479d64..b83cdbb 100644 --- a/sbin/ping/ping.c +++ b/sbin/ping/ping.c @@ -45,7 +45,7 @@ static const char copyright[] = static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93"; */ static const char rcsid[] = - "$Id: ping.c,v 1.23 1997/07/09 20:33:58 julian Exp $"; + "$Id: ping.c,v 1.24 1997/07/13 06:16:44 sef Exp $"; #endif /* not lint */ /* @@ -71,6 +71,7 @@ static const char rcsid[] = #include <ctype.h> #include <err.h> #include <errno.h> +#include <math.h> #include <netdb.h> #include <signal.h> #include <stdio.h> @@ -155,6 +156,7 @@ int timing; /* flag to do timing */ double tmin = 999999999.0; /* minimum round trip time */ double tmax = 0.0; /* maximum round trip time */ double tsum = 0.0; /* sum of all times, for doing average */ +double tsumsq = 0.0; /* sum of all times squared, for std. dev. */ int reset_kerninfo; sig_atomic_t siginfo_p; @@ -649,6 +651,7 @@ pr_pack(buf, cc, from) triptime = ((double)tv.tv_sec) * 1000.0 + ((double)tv.tv_usec) / 1000.0; tsum += triptime; + tsumsq += triptime * triptime; if (triptime < tmin) tmin = triptime; if (triptime > tmax) @@ -922,9 +925,14 @@ finish(int sig) (int) (((ntransmitted - nreceived) * 100) / ntransmitted)); (void)putchar('\n'); - if (nreceived && timing) - (void)printf("round-trip min/avg/max = %.3f/%.3f/%.3f ms\n", - tmin, tsum / (nreceived + nrepeats), tmax); + if (nreceived && timing) { + double n = nreceived + nrepeats; + double avg = tsum / n; + double vari = tsumsq / n - avg * avg; + printf("round-trip min/avg/max/stddev = " + "%.3f/%.3f/%.3f/%.3f ms\n", + tmin, avg, tmax, sqrt(vari)); + } if (reset_kerninfo && tcgetattr(STDOUT_FILENO, &ts) != -1) { ts.c_lflag &= ~NOKERNINFO; tcsetattr(STDOUT_FILENO, TCSANOW, &ts); |
