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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_FREEBIND.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_FREEBIND.2const')
| -rw-r--r-- | man/man2const/IP_FREEBIND.2const | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/man/man2const/IP_FREEBIND.2const b/man/man2const/IP_FREEBIND.2const new file mode 100644 index 0000000000..6a00dde940 --- /dev/null +++ b/man/man2const/IP_FREEBIND.2const @@ -0,0 +1,52 @@ +.\" Copyright, the authors of the Linux man-pages project +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH IP_FREEBIND 2const (date) "Linux man-pages (unreleased)" +.SH NAME +IP_FREEBIND +\- +bind to a nonlocal or nonexistent IP address +.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,\~IP_FREEBIND, +.BI " const\~int\~*" enable ,\~sizeof(int)); +.fi +.SH DESCRIPTION +If enabled, +this boolean option allows binding to an IP address +that is nonlocal or does not (yet) exist. +.P +This permits listening on a socket, +without requiring +the underlying network interface +or the specified dynamic IP address +to be up at the time +that the application is trying to bind to it. +.P +This option is the per-socket equivalent of the +.I /proc/sys/net/ipv4/ip_nonlocal_bind +interface. +.SH ERRORS +See +.BR IPPROTO_IP (2const). +See +.BR setsockopt (2). +See +.BR ip (7). +.SH STANDARDS +Linux. +.SH HISTORY +Linux 2.4. +.\" Precisely: since Linux 2.4.0-test10 +.SH SEE ALSO +.BR IPPROTO_IP (2const), +.BR setsockopt (2), +.BR proc_sys_net_ipv4 (5), +.BR ip (7) |