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| author | Alejandro Colomar <alx@kernel.org> | 2025-11-25 00:32:05 +0100 |
|---|---|---|
| committer | Alejandro Colomar <alx@kernel.org> | 2025-11-25 01:10:35 +0100 |
| commit | 582fce4c02b32ecfc75351c3494cbf4f307f5b6b (patch) | |
| tree | 65621bce4517dfb0392efbeeb2bb68ac26a88c49 /man/man2const/IP_RECVTTL.2const | |
| parent | e11a82a6f7098b94bcd00fb767a1db269e3a83db (diff) | |
| parent | 869bbbf4705313f690e85ad09b9b300b9f846165 (diff) | |
| download | man-pages-master.tar.gz | |
Signed-off-by: Alejandro Colomar <alx@kernel.org>
Diffstat (limited to 'man/man2const/IP_RECVTTL.2const')
| -rw-r--r-- | man/man2const/IP_RECVTTL.2const | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/man/man2const/IP_RECVTTL.2const b/man/man2const/IP_RECVTTL.2const new file mode 100644 index 0000000000..77eeaec2c9 --- /dev/null +++ b/man/man2const/IP_RECVTTL.2const @@ -0,0 +1,54 @@ +.\" Copyright, the authors of the Linux man-pages project +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH IP_RECVTTL 2const (date) "Linux man-pages (unreleased)" +.SH NAME +IP_RECVTTL +\- +enable IP_TTL control message +.SH LIBRARY +Standard C library +.RI ( libc ,\~ \-lc ) +.SH SYNOPSIS +.nf +.BR "#include <netinet/in.h>" " /* Definition of " IP* " constants */" +.B #include <sys/socket.h> +.P +.BI int\~setsockopt(int\~ sockfd ,\~IPPROTO_IP,\~int\~ opt , +.BI " const\~int\~*" enable ,\~sizeof(int)); +.fi +.SH DESCRIPTION +When this flag is set, +pass a +.BR IP_TTL (2const) +control message +with the time-to-live field +of the received packet as a 32 bit integer. +.P +Not supported for +.B SOCK_STREAM +sockets. +.SH ERRORS +See +.BR IPPROTO_IP (2const). +See +.BR setsockopt (2). +See +.BR ip (7). +.SH VERSIONS +Some BSD sockets implementations also provide an +.B IP_RECVTTL +option, but an ancillary message with type +.B IP_RECVTTL +is passed with the incoming packet. +This is different from the +.BR IP_TTL (2const) +option used in Linux. +.SH HISTORY +Linux 2.2. +.\" Precisely: since Linux 2.1.68 +.SH SEE ALSO +.BR IPPROTO_IP (2const), +.BR setsockopt (2), +.BR ip (7) |