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Fix discussion of IPC_RECVTTL / IP_TTL

This commit is contained in:
Michael Kerrisk 2005-09-19 12:18:24 +00:00
parent 57734e8257
commit 70d015eeb6
1 changed files with 15 additions and 2 deletions
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17
man7/ip.7
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@ -291,7 +291,7 @@ Expects a boolean integer flag.
.B IP_RECVTTL
When this flag is set
pass a
.I IP_RECVTTL
.I IP_TTL
control message with the time to live
field of the received packet as a byte. Not supported for
.B SOCK_STREAM
@ -804,6 +804,20 @@ received datagrams. Linux has the more general
.I IP_PKTINFO
for the same task.
.PP
Some BSD sockets implementations also provide an
.I IP_RECVTTL
option, but an ancillary message with type
.I IP_RECVTTL
is passed with the incoming packet.
This is different from the
.I IP_TTL
option used in Linux.
.PP
Using
.I SOL_IP
socket options level isn't portable, BSD-based stacks use
.I IPPROTO_IP
level.
.SH ERRORS
.\" XXX document all errors.
.\" We should really fix the kernels to give more uniform
@ -900,7 +914,6 @@ Other errors may be generated by the overlaying protocols; see
and
.BR socket (7).
.SH VERSIONS
.IR IP_PKTINFO ,
.IR IP_MTU ,
.IR IP_MTU_DISCOVER ,
.IR IP_PKTINFO ,