Correct use of .Nm. Remove unused #includes. Use warn(). cosmetic in usage()
string. Translate 0 sec 1000000 usec to 1 sec 0 usec.
This commit is contained in:
Philippe Charnier
parent
d4d88b1e4d
commit
e345a80d5d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=37671
@ -30,7 +30,7 @@
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)ping.8 8.2 (Berkeley) 12/11/93
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.\" $Id: ping.8,v 1.13 1998/03/19 07:45:57 charnier Exp $
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.\" $Id: ping.8,v 1.14 1998/04/01 00:32:18 imp Exp $
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.\"
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.Dd March 1, 1997
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.Dt PING 8
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@ -41,7 +41,7 @@
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.Tn ICMP ECHO_REQUEST
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packets to network hosts
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.Sh SYNOPSIS
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.Nm
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.Nm ping
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.Op Fl QRadfnqrv
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.Op Fl c Ar count
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.Op Fl i Ar wait
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@ -74,7 +74,7 @@ header, followed by a
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and then an arbitrary number of
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.Dq pad
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bytes used to fill out the packet. The options are as follows:
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.Bl -tag -width Ds
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.Bl -tag -width indent
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.It Fl a
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Audible. Include a bell
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.Pq ASCII 0x07
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@ -122,7 +122,7 @@ This flag only applies if the ping destination is a multicast address.
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If
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.Ar preload
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is specified,
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.Nm ping
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.Nm
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sends that many packets as fast as possible before falling into its normal
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mode of behavior.
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Only the super-user may use this option.
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@ -190,7 +190,7 @@ e.g., after the interface was dropped by
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.Xr routed 8
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.Pc .
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.It Fl s Ar packetsize
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Specifies the number of data bytes to be sent.
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Specify the number of data bytes to be sent.
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The default is 56, which translates into 64
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.Tn ICMP
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data bytes when combined
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@ -271,7 +271,7 @@ to the same request.
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.Pp
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Damaged packets are obviously serious cause for alarm and often
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indicate broken hardware somewhere in the
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.Nm ping
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.Nm
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packet's path (in the network or in the hosts).
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.Sh TRYING DIFFERENT DATA PATTERNS
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The
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@ -326,7 +326,9 @@ uses 30,
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used 15
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.Pc .
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.Pp
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The maximum possible value of this field is 255, and most Unix systems set
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The maximum possible value of this field is 255, and most
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.Ux
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systems set
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the
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.Tn TTL
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field of
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@ -339,14 +341,18 @@ some hosts, but not reach them with
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or
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.Xr ftp 1 .
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.Pp
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In normal operation ping prints the ttl value from the packet it receives.
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In normal operation
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.Nm
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prints the ttl value from the packet it receives.
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When a remote system receives a ping packet, it can do one of three things
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with the
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.Tn TTL
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field in its response:
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.Bl -bullet
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.It
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Not change it; this is what Berkeley Unix systems did before the
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Not change it; this is what
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.Bx
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systems did before the
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.Bx 4.3 tahoe
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release.
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In this case the
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@ -355,7 +361,7 @@ value in the received packet will be 255 minus the
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number of routers in the round-trip path.
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.It
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Set it to 255; this is what current
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.Tn BSD
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.Bx
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systems do.
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In this case the
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.Tn TTL
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@ -41,17 +41,17 @@ static const char copyright[] =
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#endif /* not lint */
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#ifndef lint
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/*
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#if 0
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static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93";
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*/
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#endif
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static const char rcsid[] =
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"$Id: ping.c,v 1.37 1998/05/25 20:16:05 fenner Exp $";
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"$Id$";
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#endif /* not lint */
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/*
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* P I N G . C
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*
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* Using the InterNet Control Message Protocol (ICMP) "ECHO" facility,
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* Using the Internet Control Message Protocol (ICMP) "ECHO" facility,
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* measure round-trip-delays and packet loss across network paths.
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*
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* Author -
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@ -82,7 +82,6 @@ static const char rcsid[] =
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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@ -176,7 +175,7 @@ static void pr_retip(struct ip *);
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static void status(int);
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static void stopit(int);
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static void tvsub(struct timeval *, struct timeval *);
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static void usage(const char *) __dead2;
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static void usage(void) __dead2;
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int
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main(argc, argv)
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@ -314,13 +313,12 @@ main(argc, argv)
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options |= F_VERBOSE;
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break;
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default:
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usage(argv[0]);
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usage();
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}
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}
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if (argc - optind != 1)
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usage(argv[0]);
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usage();
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target = argv[optind];
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bzero((char *)&whereto, sizeof(struct sockaddr));
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@ -502,7 +500,7 @@ main(argc, argv)
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timeout.tv_usec += 1000000;
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timeout.tv_sec--;
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}
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while (timeout.tv_usec > 1000000) {
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while (timeout.tv_usec >= 1000000) {
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timeout.tv_usec -= 1000000;
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timeout.tv_sec++;
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}
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@ -520,7 +518,7 @@ main(argc, argv)
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if ((cc = recvmsg(s, &msg, 0)) < 0) {
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if (errno == EINTR)
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continue;
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perror("ping: recvmsg");
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warn("recvmsg");
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continue;
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}
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#ifdef SO_TIMESTAMP
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@ -1269,15 +1267,10 @@ fill(bp, patp)
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}
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static void
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usage(argv0)
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const char *argv0;
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usage()
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{
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if (strrchr(argv0,'/'))
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argv0 = strrchr(argv0,'/') + 1;
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fprintf(stderr,
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"usage: %s [-QRadfnqrv] [-c count] [-i wait] [-l preload] "
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"[-p pattern]\n [-s packetsize] "
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"[host | [-L] [-I iface] [-T ttl] mcast-group]\n",
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argv0);
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fprintf(stderr, "%s\n%s\n",
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"usage: ping [-QRadfnqrv] [-c count] [-i wait] [-l preload] [-p pattern]",
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" [-s packetsize] [host | [-L] [-I iface] [-T ttl] mcast-group]");
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exit(EX_USAGE);
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}
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