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Add an -o option to exit after receiving one reply. This can be used

Browse Source 
to test whether a link is live.

PR:		38573
Submitted by:	David Taylor <davidt@yadt.co.uk>
Obtained from:	NetBSD
This commit is contained in:
Dima Dorfman 2002-10-02 03:24:27 +00:00
parent 92dbb82a47
commit 8025c44b00
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=104339
2 changed files with 12 additions and 5 deletions
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6
sbin/ping/ping.8
View File

@ -32,7 +32,7 @@
.\" @(#)ping.8 8.2 (Berkeley) 12/11/93
.\" $FreeBSD$
.\"
.Dd September 25, 2001
.Dd October 2, 2002
.Dt PING 8
.Os
.Sh NAME
@ -42,7 +42,7 @@
packets to network hosts
.Sh SYNOPSIS
.Nm
.Op Fl AQRadfnqrv
.Op Fl AQRadfnoqrv
.Op Fl c Ar count
.Op Fl i Ar wait
.Op Fl l Ar preload
@ -160,6 +160,8 @@ This flag only applies if the ping destination is a multicast address.
.It Fl n
Numeric output only.
No attempt will be made to lookup symbolic names for host addresses.
.It Fl o
Exit successfully after receiving one reply packet.
.It Fl p Ar pattern
You may specify up to 16
.Dq pad

11
sbin/ping/ping.c
View File

@ -137,6 +137,7 @@ int options;
#endif /*IPSEC*/
#define F_TTL 0x8000
#define F_MISSED 0x10000
#define F_ONCE 0x20000
/*
* MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
@ -242,7 +243,7 @@ main(argc, argv)
datap = &outpack[MINICMPLEN + PHDR_LEN];
while ((ch = getopt(argc, argv,
"AI:LQRS:T:c:adfi:l:m:np:qrs:t:v"
"AI:LQRS:T:c:adfi:l:m:nop:qrs:t:v"
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
"P:"
@ -320,6 +321,9 @@ main(argc, argv)
case 'n':
options |= F_NUMERIC;
break;
case 'o':
options |= F_ONCE;
break;
case 'p': /* fill buffer with user pattern */
options |= F_PINGFILLED;
fill((char *)datap, optarg);
@ -696,7 +700,8 @@ main(argc, argv)
t = &now;
}
pr_pack((char *)packet, cc, &from, t);
if (npackets && nreceived >= npackets)
if (options & F_ONCE && nreceived ||
npackets && nreceived >= npackets)
break;
}
if (n == 0 || options & F_FLOOD) {
@ -1441,7 +1446,7 @@ static void
usage()
{
(void)fprintf(stderr, "%s\n%s\n%s\n",
"usage: ping [-AQRadfnqrv] [-c count] [-i wait] [-l preload] [-m ttl]",
"usage: ping [-AQRadfnoqrv] [-c count] [-i wait] [-l preload] [-m ttl]",
" [-p pattern] "
#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC